TWM544001U - Optical image capturing system - Google Patents

Abstract

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

Description

Optical imaging system

The present invention relates to an optical imaging system, and more particularly to a miniaturized optical imaging system for use in electronic products.

In recent years, with the rise of portable electronic products with photographic functions, the demand for optical systems has increased. Generally, the photosensitive element of the optical system is nothing more than a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semicondu TP Sensor (CMOS Sensor), and with the advancement of semiconductor process technology, As the size of the pixel of the photosensitive element is reduced, the optical system is gradually developed in the field of high-pixels, and thus the requirements for image quality are increasing.

The optical system conventionally mounted on a portable device mainly uses a two-piece or three-piece lens structure. However, since the portable device continues to enhance the pixels and the end consumer demand for a large aperture such as low light and night The shooting function or the need for a wide viewing angle such as the self-timer function of the front lens. However, an optical system designed with a large aperture often faces a situation in which more aberrations cause deterioration in peripheral imaging quality and ease of manufacture, and an optical system that designs a wide viewing angle faces an increase in distortion of imaging, which is conventionally known. Optical imaging systems have been unable to meet higher-order photography requirements.

Therefore, how to effectively increase the amount of light entering the optical imaging system and increase the viewing angle of the optical imaging system, in addition to further improving the overall pixel and quality of imaging, while taking into account the balanced design of the miniaturized optical imaging system, has become a very important issue.

The embodiment of the present invention is directed to an optical imaging system capable of utilizing the refractive power of four lenses, a combination of convex and concave surfaces (the convex or concave surface of the present invention refers in principle to the object side or image side of each lens to the optical axis. The geometry is described above, which effectively increases the amount of light entering the optical imaging system and increases the viewing angle of the optical imaging system, while improving the overall picture quality and quality of the image for use in small electronic products.

The terms and symbols of the mechanism component parameters related to the present embodiment are listed below as a reference for subsequent descriptions. Please refer to FIGS. 7A, 7B, and 7C. The optical imaging system may include an image sensing module (not shown). The image sensing module includes a substrate and a photosensitive element disposed on the substrate. The optical imaging system includes a first lens 710, a second lens 720, a third lens 730, and a fourth lens 740, and has an imaging surface 780. . In addition, a lens positioning component 794 can be included, which is hollow and can accommodate any lens, and the lens segments are arranged on the optical axis. The lens positioning component includes an object end 796 and an image end 798. The object end portion 796 is adjacent to the object side and has a first opening 7792. The image end portion 798 has a second opening 7982 near the image side. The outer wall of the lens positioning member 794 includes two tangent planes 799, respectively. A molded mouth mark 7992. The inner diameter of the first opening 7792 is OD, and the inner diameter of the second opening 7982 is ID, which satisfies the following condition: 0.1 ≦ OD / ID < 10. The minimum thickness of the object end 796 is OT and the minimum thickness of the image end 798 is IT, which satisfies the following condition: 0.1 ≦ OT / IT < 10.

Referring to FIGS. 8A, 8B, and 8C, the optical imaging system may include an image sensing module (not shown), the image sensing module includes a substrate and a photosensitive element disposed on the substrate; the optical imaging system The first lens 810, the second lens 820, the third lens 830, and the fourth lens 840 are included and have an imaging surface 880. In addition, a lens positioning component 894 can be included, which is hollow and can accommodate any lens, and arranges the lens segments on the optical axis. The element includes an object end 896 and an image end portion 898 that is adjacent to the object side and has a first opening 8962. The image end portion 898 has a second opening 8982 near the image side. The lens positioning element 894 The outer wall includes three incision planes 899, each having a profiled mouth mark 8992. The inner diameter of the first opening 8962 is OD, and the inner diameter of the second opening 8982 is ID, which satisfies the following condition: 0.1 ≦ OD / ID < 10. The minimum thickness of the object end 896 is OT and the minimum thickness of the image end portion 898 is IT, which satisfies the following condition: 0.1 ≦ OT / IT < 10.

The terms of the lens parameters associated with the present embodiment and their code numbers are listed below as a reference for subsequent descriptions:

Lens parameters related to length or height

The 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 first lens side of the optical imaging system and the side of the fourth lens image is represented by InTL; the fourth lens image side of the optical imaging system The distance to the imaging plane is represented by InB; InTL+InB=HOS; the distance between the fixed diaphragm (aperture) of the optical imaging system to the imaging plane is represented by InS; the distance between the first lens and the second lens of the optical imaging system Indicated by IN12 (exemplary); the thickness of the first lens of the optical imaging system on the optical axis is represented by TP1 (exemplary).

Material-related lens parameters

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

Lens parameters related to viewing angle

The angle of view is represented by AF; half of the angle of view is represented by HAF; the angle of the chief ray is expressed by MRA.

Lens parameters related to access

The entrance pupil diameter of the optical imaging system is represented by HEP; the maximum effective radius of any surface of the single lens refers to the maximum viewing angle of the system through which the incident light passes through the edge of the entrance pupil at the intersection of the lens surface (Effective Half Diameter; EHD), the vertical height between the intersection and the optical axis. For example, the maximum effective radius of the side of the first lens is represented by EHD11, and the maximum effective radius of the side of the first lens image is represented by EHD12. The maximum effective radius of the side of the second lens is represented by EHD 21, and the maximum effective radius of the side of the second lens image is represented by EHD 22. The maximum effective radius representation of any of the remaining lenses in the optical imaging system is analogous.

Parameters related to the lens arc length and surface profile

The length of the profile curve of the maximum effective radius of any surface of a single lens refers to the intersection of the surface of the lens and the optical axis of the associated optical imaging system, starting from the starting point along the surface contour of the lens until The end of the maximum effective radius, the arc length between the above two points is the length of the contour curve of the maximum effective radius, and is represented by ARS. For example, the profile curve length of the maximum effective radius of the side of the first lens object is represented by ARS11, and the profile curve length of the maximum effective radius of the side of the first lens image is represented by ARS12. The profile curve length of the maximum effective radius of the side of the second lens object is represented by ARS21, and the profile curve length of the maximum effective radius of the side of the second lens image is represented by ARS22. The maximum effective radius profile curve length representation of any of the remaining lenses in the optical imaging system is analogous.

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

Parameters related to the depth of the lens profile

The horizontal displacement distance from the intersection of the side of the fourth lens object on the optical axis to the maximum effective radius of the side of the fourth lens object on the optical axis is represented by InRS41 (exemplary); the intersection of the side of the fourth lens image on the optical axis to the fourth The horizontal displacement distance of the largest effective radius position of the lens image side on the optical axis is represented by InRS42 (exemplary).

Parameters related to the lens surface

The critical point C refers to a point on the surface of a specific lens that is tangent to a plane perpendicular to the optical axis except for the intersection with the optical axis. For example, the vertical distance C31 of the side surface of the third lens object and the vertical distance of the optical axis are HVT31 (exemplary), and the vertical distance of the critical point C32 of the third lens image side from the optical axis is HVT32 (exemplary), the fourth lens object The vertical distance between the critical point C41 of the side surface and the optical axis is HVT41 (exemplary), and the vertical distance of the critical point C42 of the fourth lens image side from the optical axis is HVT42 (exemplary). The critical point on the side or image side of the other lens and its vertical distance from the optical axis are expressed in the same manner as described above.

The inflection point closest to the optical axis on the side of the fourth lens object is IF411, the point sinking amount SGI411 (exemplary), that is, the intersection of the side of the fourth lens object on the optical axis to the optical axis of the fourth lens object The horizontal displacement distance between the inflection points parallel to the optical axis, and the vertical distance between the point and the optical axis of the IF411 is HIF411 (exemplary). The inflection point closest to the optical axis on the side of the fourth lens image is IF421, the sinking amount SGI421 (exemplary), that is, the intersection of the side of the fourth lens image on the optical axis to the optical axis of the side of the fourth lens image The horizontal displacement distance between the inflection points parallel to the optical axis, and the vertical distance between the point and the optical axis of the IF421 is HIF421 (exemplary).

The inflection point of the second near-optical axis on the side of the fourth lens object is IF412, and the point sinking amount SGI412 (exemplary), that is, the intersection of the side of the fourth lens object on the optical axis and the side of the fourth lens object is second. The horizontal displacement distance between the inflection points of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF 412 is HIF 412 (exemplary). The second lens image on the side is opposite to the second optical axis The curvature point is IF422, the point sinking amount SGI422 (exemplary), that is, the intersection of the fourth lens image side on the optical axis and the fourth lens image side second close to the optical axis, and the optical axis is parallel Horizontal displacement distance, IF422 The vertical distance between this point and the optical axis is HIF422 (exemplary).

The inflection point of the third near-optical axis on the side of the fourth lens object is IF413, and the point sinking amount SGI413 (exemplary), that is, the intersection of the side of the fourth lens object on the optical axis and the side of the fourth lens object is the third closest. The horizontal displacement distance between the inflection point of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of IF4132 is HIF413 (exemplary). The inflection point of the third near-optical axis on the side of the fourth lens image is IF423, the point sinking amount SGI423 (exemplary), that is, the intersection of the side of the fourth lens image on the optical axis and the side of the fourth lens image is the third closest. The horizontal displacement distance between the inflection point of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF 423 is HIF423 (exemplary).

The inflection point of the fourth near-optical axis on the side of the fourth lens object is IF414, and the point sinking amount SGI414 (exemplary), that is, the intersection of the side of the fourth lens object on the optical axis and the side of the fourth lens object is fourth. The horizontal displacement distance between the inflection points of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF 414 is HIF 414 (exemplary). The inflection point of the fourth near-optical axis on the side of the fourth lens image is IF424, the point sinking amount SGI424 (exemplary), that is, the SGI 424, that is, the intersection of the side of the fourth lens image on the optical axis and the fourth lens image side is fourth. The horizontal displacement distance between the inflection points of the optical axis and the optical axis, and the vertical distance between the point and the optical axis of the IF 424 is HIF 424 (exemplary).

The inflection point on the side or image side of the other lens and its vertical distance from the optical axis or the amount of its sinking are expressed in the same manner as described above.

Variant related to aberration

Optical Distortion of an optical imaging system is represented by ODT; its TV Distortion is represented by TDT, and can further define the degree of aberration shift described between imaging 50% to 100% of field of view; spherical aberration bias The shift is represented by DFS; the comet aberration offset is represented by DFC.

The lateral aberration of the aperture edge is expressed by STA (STOP Transverse Aberration), and the performance of the specific optical imaging system is evaluated. The ray lateral direction of any field of view can be calculated by using a tangential fan or a sagittal fan. The aberrations, in particular, the calculation of the longest operating wavelength (for example, a wavelength of 650 nm) and the shortest operating wavelength (for example, a wavelength of 470 nm) by the lateral aberration of the aperture edge are excellent criteria for performance. The coordinate direction of the aforementioned meridional surface fan can be further divided into a positive direction (upper ray) and a negative direction (lower ray). The longest working wavelength passes through the lateral aberration of the aperture edge, which is defined as the imaging position at which the longest working wavelength is incident on a certain field of view on the imaging plane through the aperture edge, which is compared with the reference wavelength chief ray (eg, wavelength 555 nm) on the imaging surface. The difference between the two positions of the imaging position of the field, the shortest working wavelength passing through the lateral aberration of the aperture edge, which is defined as the imaging position at which the shortest working wavelength is incident on the imaging surface through the aperture edge, which is opposite to the reference wavelength chief ray. The difference in distance between the two positions of the imaging position of the field of view on the imaging surface, the performance of the specific optical imaging system is evaluated to be excellent, and the shortest and longest working wavelengths can be used to enter the imaging field by the aperture edge at the 0.7 field of view (ie, the imaging height HOI) The lateral aberrations are all less than 100 micrometers (μm) as the inspection mode, and even the shortest and longest working wavelengths are incident on the imaging surface through the aperture edge. The lateral aberration of the field of view is less than 80 micrometers (μm). Nuclear way.

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

The present invention provides an optical imaging system in which an object side or an image side of a fourth lens is provided with an inflection point, which can effectively adjust the angle at which each field of view is incident on the fourth lens, and correct for optical distortion and TV distortion. In addition, the surface of the fourth lens can have better optical path adjustment capability to improve image quality.

According to the present invention, there is provided an optical imaging system comprising a first lens, a second lens, a third lens, a fourth lens, a lens positioning element, and an imaging surface sequentially from the object side to the image side. The lens positioning component is hollow and can accommodate any lens, and the lens segments are arranged on the optical axis. The lens positioning component includes an object end and an image end, and the object end is close to the object side. And having a first opening, the image end has a second opening near the image side, and the outer wall of the lens positioning element comprises at least two cutting planes, each of the cutting planes having at least one shaped burr mark. The first lens has a refractive power. The focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging system is HEP, and the first lens side to the imaging surface has a distance HOS on the optical axis, and the first lens side to the fourth through The mirror side has a distance InTL on the optical axis, and half of the maximum viewing angle of the optical imaging system is HAF, and the intersection of any surface of any of the lenses and the optical axis is the starting point, and the contour of the surface is extended until The surface of the surface is at a distance from the coordinate point at the vertical height of the optical axis 1/2 incident 瞳 diameter. The length of the contour curve between the two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg And 0.9≦2(ARE/HEP)≦2.0.

According to the present invention, there is further provided an optical imaging system comprising a first lens, a second lens, a third lens, a fourth lens, a lens positioning element and an imaging surface sequentially from the object side to the image side. Wherein the lens positioning component is hollow and can accommodate any lens, and the lens segments are arranged on the optical axis, the lens The positioning component includes an object end portion and an image end portion, the object end portion is adjacent to the object side and has a first opening. The image end portion has a second opening adjacent to the image side, and the lens positioning member outer wall includes at least two cut ends. Plane, each of the cutting planes having at least one shaped irrigant. The first lens has a refractive power. The second lens has a refractive power. The third lens has a refractive power. The fourth lens has a refractive power. At least one surface of at least two of the first lens to the fourth lens has at least one inflection point, and at least one of the second lens to the fourth lens has a positive refractive power, the optical imaging system The focal length is f, the incident pupil diameter of the optical imaging 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 fourth lens image side is on the optical axis There is a distance InTL, half of the maximum viewing angle of the optical imaging system is HAF, and the intersection of any surface of any of the lenses with the optical axis is the starting point, and the contour of the surface is extended until the surface is separated from the light The axis 1/2 is incident on the coordinate point at the vertical height of the 瞳 diameter. The length of the contour curve between the two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg and 0.9≦2 ( ARE/HEP) ≦ 2.0.

According to the present invention, an optical imaging system is further provided, which includes a first lens, a second lens, a third lens, a fourth lens, a lens positioning element, and an imaging surface sequentially from the object side to the image side. The lens positioning component is hollow and can accommodate any lens, and the lens segments are arranged on the optical axis. The lens positioning component includes an object end and an image end, and the object end is close to the object side. And having a first opening, the image end has a second opening near the image side, and the outer wall of the lens positioning element comprises at least three cutting planes, each of the cutting planes having at least one shaped burr mark. At least one of the object side surface and the image side surface of the fourth lens has at least one inflection point, wherein the optical imaging system has four lenses having a refractive power. The first lens has a refractive power. The second lens has a refractive power. The third lens has a refractive power. The fourth lens has a refractive power. The focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging system is HEP, and the first lens side to the imaging surface has a distance HOS on the optical axis, the first through The side of the mirror object has a distance InTL on the optical axis of the fourth lens image side, and the half of the maximum viewing angle of the optical imaging system is HAF, and the intersection of any surface of the lens and the optical axis is the starting point Extending the contour of the surface until the coordinate point on the surface at a vertical height from the optical axis 1/2 incident 瞳 diameter, the contour curve length between the two points is ARE, which satisfies the following condition: 1≦f/HEP ≦10; 0deg<HAF≦150deg and 0.9≦2(ARE/HEP)≦2.0.

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

The length of the profile curve of any surface of a single lens in the height range of 1/2 incident pupil diameter (HEP) particularly affects the corrected aberration of the surface in the common field of the ray field and the optical path difference between the fields of view. The longer the length of the contour curve, the better the ability to correct aberrations, but at the same time it will increase production. The difficulty in manufacturing, so it is necessary to control the length of the profile curve of any surface of a single lens in the range of 1/2 incident 瞳 diameter (HEP), in particular to control the 1/2 incident 瞳 diameter (HEP) height range of the surface. The proportional relationship between the inner contour length (ARE) and the thickness (TP) of the lens on the optical axis (ARE/TP). For example, the length of the profile curve of the 1/2 incident pupil diameter (HEP) height of the side surface of the first lens object is represented by ARE11, and the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ARE11/TP1. The profile curve length of the 1/2 incident pupil diameter (HEP) height of the mirror side is represented by ARE12, and the ratio between it and TP1 is ARE12/TP1. The length of the profile curve of the 1/2 incident pupil diameter (HEP) height of the side surface of the second lens object is represented by ARE21. The thickness of the second lens on the optical axis is TP2, and the ratio between the two is ARE21/TP2, and the second lens image The profile curve length of the 1/2 incident pupil diameter (HEP) height of the side is represented by ARE22, and the ratio between it and TP2 is ARE22/TP2. The proportional relationship between the length of the contour curve of the 1/2 incident pupil diameter (HEP) height of any surface of the remaining lenses in the optical imaging system and the thickness (TP) of the lens on the optical axis to which the surface belongs, expressed by This type of push.

The optical imaging system can be used to image an image sensing component having a diagonal length of 1/1.2 inch or less. The size of the image sensing component is preferably 1/2.3 inch, and the image sensing component is The pixel size is less than 1.4 micrometers (μm), preferably the pixel size is less than 1.12 micrometers (μm), and the pixel size is preferably less than 0.9 micrometers (μm). In addition, the optical imaging system can be applied to image sensing elements with an aspect ratio of 16:9.

The aforementioned optical imaging system can be applied to video recording requirements of millions or more pixels (for example, 4K2K or UHD, QHD) and has good imaging quality.

When |f1|>f4, the total imaging height (HOS; Height of Optic System) of the optical imaging system can be appropriately shortened to achieve miniaturization.

When |f2|+|f3|>|f1|+|f4|, by the second At least one of the mirror to the third lens has a weak positive refractive power or a weak negative refractive power. The so-called weak refractive power means that the absolute value of the focal length of a particular lens is greater than 10. When at least one of the second lens to the third lens of the present invention has a weak positive refractive power, it can effectively share the positive refractive power of the first lens to avoid premature occurrence of unnecessary aberrations, and vice versa if the second lens is If at least one of the three lenses has a weak negative refractive power, the aberration of the correction system can be fine-tuned.

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

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

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

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

Sides of 112, 212, 312, 412, 512, 612‧‧

114, 214, 314, 414, 514, 614‧‧‧ side

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

Sides of 122, 222, 322, 422, 522, 622‧‧

124, 224, 324, 424, 524, 624‧‧‧ side

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

132, 232, 332, 432, 532, 632‧‧‧ ‧ side

134, 234, 334, 434, 534, 634 ‧ ‧ side

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

Sides of 142, 242, 342, 442, 542, 642‧‧

144, 244, 344, 444, 544, 644‧‧‧

170, 270, 370, 470, 570, 670‧‧ ‧ infrared filters

180, 280, 380, 480, 580, 680, 780, 880 ‧ ‧ imaging surface

190, 290, 390, 490, 590, 690‧‧‧ image sensing components

794, 894‧‧‧ lens positioning elements

796, 896‧‧ ‧ end

798, 898‧‧‧ like the end

7962, 8962‧‧‧ first opening

7982, 8982‧‧‧ second opening

799, 899‧‧‧ cut plane

7992, 8992‧‧‧ molding mouth mark

F‧‧‧focal length of optical imaging system

F1‧‧‧The focal length of the first lens

F2‧‧‧The focal length of the second lens

f3‧‧‧The focal length of the third lens

F4‧‧‧The focal length of the fourth lens

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

Half of the largest perspective of the HAF‧‧ optical imaging system

NA1‧‧‧Dispersion coefficient of the first lens

Dispersion coefficient of NA2, NA3, NA4‧‧‧ second lens to fourth lens

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

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

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

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

TP1‧‧‧ thickness of the first lens on the optical axis

TP2, TP3, TP4‧‧‧ thickness of the second lens to the fourth lens on the optical axis

TP TP‧‧‧sum of the thickness of all refractive lenses

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

IN23‧‧‧Separation distance between the second lens and the third lens on the optical axis

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

InRS41‧‧‧ Horizontal displacement distance of the fourth lens from the intersection of the side on the optical axis to the maximum effective radius of the side of the fourth lens on the optical axis

IF411‧‧‧ the inflection point closest to the optical axis on the side of the fourth lens

SGI411‧‧‧The amount of subsidence at this point

HIF411‧‧‧The vertical distance between the inflection point closest to the optical axis on the side of the fourth lens and the optical axis

IF 421‧‧‧ the fourth lens image on the side closest to the optical axis of the inflection point

SGI421‧‧‧The amount of subsidence at this point

HIF421‧‧‧The vertical distance between the inflection point of the fourth lens image on the side closest to the optical axis and the optical axis

IF 412‧‧‧ the second inversion point on the side of the fourth lens object close to the optical axis

SGI412‧‧‧The amount of subsidence at this point

HIF412‧‧‧The distance between the inflection point of the second near-optical axis of the fourth lens object and the optical axis

IF422‧‧‧The fourth lens image on the side of the second near the optical axis of the inflection point

SGI422‧‧‧The amount of subsidence

HIF422‧‧‧The distance between the inflection point of the second lens image on the side closer to the optical axis and the optical axis

IF413‧‧‧ the third inversion point on the side of the fourth lens object close to the optical axis

SGI413‧‧‧The amount of subsidence at this point

HIF413‧‧‧The vertical distance between the inflection point of the third lens near the optical axis and the optical axis

IF 423‧‧ ‧ the fourth lens on the side of the third close to the optical axis of the inflection point

SGI423‧‧‧The amount of subsidence at this point

HIF423‧‧‧The distance between the inflection point of the third lens near the optical axis and the vertical distance between the optical axes

IF414‧‧‧ the fourth invisible point on the side of the fourth lens

SGI414‧‧‧The amount of subsidence at this point

HIF414‧‧‧The fourth lens object side of the fourth close to the optical axis of the inflection point and the vertical distance between the optical axis

IF424‧‧‧The fourth lens image on the side of the fourth near the optical axis of the inflection point

SGI424‧‧‧The amount of subsidence at this point

HIF424‧‧‧The distance between the inflection point of the fourth lens near the optical axis and the vertical distance between the optical axis

C41‧‧‧The critical point on the side of the fourth lens

C42‧‧‧The critical point of the fourth lens image side

SGC41‧‧‧The horizontal displacement distance between the critical point of the fourth lens object and the optical axis

SGC42‧‧‧The horizontal displacement distance between the critical point of the fourth lens image side and the optical axis

HVT41‧‧‧The vertical distance between the critical point of the fourth lens object and the optical axis

HVT42‧‧‧The distance between the critical point of the fourth lens image side and the optical axis

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

Diagonal length of Dg‧‧ image sensing components

InS‧‧‧ aperture to imaging surface distance

InTL‧‧‧Distance of the side of the first lens to the side of the fourth lens

InB‧‧‧The distance from the side of the fourth lens image to the image plane

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

TV Distortion of TDT‧‧‧ optical imaging system during image formation

Optical Distortion of ODT‧‧‧Optical Imaging System in Image Formation

The above and other features of the present invention will be described in detail with reference to the drawings.

1A is a schematic view showing the optical imaging system of the first embodiment of the present invention; FIG. 1B is a left-to-right sequence showing the spherical aberration, astigmatism, and optical distortion of the optical imaging system of the first embodiment of the present invention. 1C is a transverse aberration diagram of a meridional plane fan and a sagittal plane fan of the optical imaging system of the first embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view; 2A is a schematic diagram showing an optical imaging system of a second embodiment of the present invention; FIG. 2B is a left-to-right sequence showing spherical aberration, astigmatism, and optical distortion of the optical imaging system of the second embodiment of the present invention. 2C is a transverse aberration diagram of the meridional plane fan and the sagittal plane fan of the optical imaging system of the second embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view; Figure 3A is a schematic view showing the optical imaging system of the third embodiment of the present creation FIG. 3B is a graph showing spherical aberration, astigmatism, and optical distortion of the optical imaging system of the third embodiment of the present invention from left to right; FIG. 3C is a diagram showing optical imaging of the third embodiment of the present creation. The meridional plane fan and the sagittal plane fan of the system, the longest working wavelength and the shortest working wavelength pass the lateral aberration diagram of the aperture edge at 0.7 field of view; FIG. 4A shows the optical imaging system of the fourth embodiment of the present creation 4B is a graph showing the spherical aberration, astigmatism and optical distortion of the optical imaging system of the fourth embodiment of the present invention from left to right; FIG. 4C is a diagram showing the optical imaging of the fourth embodiment of the present creation. The meridional plane fan and the sagittal plane fan of the system, the longest working wavelength and the shortest working wavelength pass the lateral aberration diagram of the aperture edge at the 0.7 field of view; FIG. 5A shows the optical imaging system of the fifth embodiment of the present creation FIG. 5B is a graph showing spherical aberration, astigmatism, and optical distortion of the optical imaging system of the fifth embodiment of the present invention from left to right; FIG. 5C is a diagram showing optical imaging of the fifth embodiment of the present creation. Systematic a meridional plane fan and a sagittal plane fan, the longest working wavelength and the shortest working wavelength pass through the aperture edge at a 0.7 field of view lateral aberration diagram; FIG. 6A is a schematic diagram of the optical imaging system of the sixth embodiment of the present invention; 6B is a graph showing spherical aberration, astigmatism, and optical distortion of the optical imaging system of the sixth embodiment of the present invention from left to right; FIG. 6C is a diagram showing the optical imaging system of the sixth embodiment of the present invention. The meridional plane fan and the sagittal plane fan, the longest working wavelength and the shortest working wavelength pass the lateral aberration diagram of the aperture edge at 0.7 field of view.

Figure 7A is a perspective side view showing the lens positioning member of the first embodiment of the present invention; FIG. 7B is a plan view showing the lens positioning member of the first embodiment of the present invention, the second opening of the image end portion facing the first opening of the object end portion, and the outer wall of the lens positioning member has two cutting planes. The cutting planes respectively have a forming nozzle mark; the 7C is a cross-sectional view of the lens positioning component of the first embodiment of the present invention; and FIG. 8A is a diagram showing the second embodiment to the sixth embodiment of the present invention. A perspective view of the lens positioning member; FIG. 8B is a plan view showing the lens positioning member of the second to sixth embodiments of the present invention, the first opening of the second opening from the image end toward the object end in a plan view direction The outer wall of the lens positioning member has three tangential planes, each of which has a forming burr mark; and FIG. 8C is a cross-sectional view showing the lens locating elements of the second to sixth embodiments of the present invention.

An optical imaging system includes a first lens, a second lens, a third lens, and a fourth lens having refractive power sequentially from the object side to the image side. The optical imaging system can further include an image sensing component disposed on the imaging surface.

The optical imaging system can be designed using three operating wavelengths, 486.1 nm, 587.5 nm, and 656.2 nm, respectively, with 587.5 nm being the reference wavelength at which the primary reference wavelength is the dominant extraction technique. The optical imaging system can also be designed using five operating wavelengths, namely 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm, with 555 nm being the reference wavelength at which the primary reference wavelength is the dominant extraction technique.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens having a positive refractive power, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens having a negative refractive power, NPR, all positive refractive power lenses The sum of PPR is ΣPPR, the sum of NPR of all lenses with negative refractive power For ΣNPR, it helps to control the total refractive power and total length of the optical imaging system when the following conditions are met: 0.5 ≦Σ PPR / | Σ NPR | ≦ 4.5, preferably, the following conditions are satisfied: 1 ≦Σ PPR / | Σ NPR|≦3.5.

The system height of the optical imaging system is HOS. When the HOS/f ratio approaches 1, it will be advantageous to make a miniaturized and imageable ultra-high pixel optical imaging system.

The sum of the focal lengths fp of each of the lenses of the optical imaging system having a positive refractive power is ΣPP, and the sum of the focal lengths of the lenses each having a negative refractive power is ΣNP. One embodiment of the optical imaging system of the present invention satisfies the following conditions: 0<ΣPP≦200; and f1/ΣPP≦0.85. Preferably, the following conditions are satisfied: 0 < Σ PP ≦ 150; and 0.01 ≦ f1/Σ PP ≦ 0.7. Thereby, it is helpful to control the focusing ability of the optical imaging system, and to properly distribute the positive refractive power of the system to suppress the occurrence of significant aberrations prematurely.

The first lens may have a positive refractive power and the object side may be convex. Thereby, the positive refractive power of the first lens can be appropriately adjusted to help shorten the total length of the optical imaging system.

The second lens can have a negative refractive power. Thereby, the aberration generated by the first lens can be corrected.

The third lens can have a positive refractive power. Thereby, the positive refractive power of the first lens can be shared.

The fourth lens may have a negative refractive power, and the image side may be a concave surface. Thereby, it is advantageous to shorten the back focal length to maintain miniaturization. In addition, at least one surface of the fourth lens may have at least one inflection point, which can effectively suppress the angle of incidence of the off-axis field of view light, and further correct the aberration of the off-axis field of view. Preferably, both the object side and the image side have at least one inflection point.

The optical imaging system can further include an image sensing component disposed on the imaging surface. The half of the diagonal length of the effective sensing area of the image sensing element (ie, the imaging height or the maximum image height of the optical imaging system) is HOI, and the distance from the side of the first lens to the optical axis of the imaging surface is HOS, The following conditions are met: HOS/HOI≦3; and 0.5≦HOS/f≦3.0. Preferably, the following conditions are satisfied: 1 ≦ HOS / HOI ≦ 2.5; and 1 ≦ HOS / f ≦ 2. Thereby, the miniaturization of the optical imaging system can be maintained to be mounted on a thin and portable electronic product.

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

In the optical imaging system of the present invention, the aperture configuration may be a front aperture or a center aperture, wherein the front aperture means that the aperture is disposed between the object and the first lens, and the center aperture means that the aperture is disposed on the first lens and Between the imaging surfaces. If the aperture is a front aperture, the optical imaging system can make a long distance between the exit pupil and the imaging surface to accommodate more optical components, and increase the efficiency of the image sensing component to receive images; if it is a center aperture, Helps to expand the system's field of view, giving optical imaging systems the advantage of a wide-angle lens. The distance from the aforementioned aperture to the imaging surface is InS, which satisfies the following condition: 0.2 ≦ InS/HOS ≦ 1.1. Preferably, the following condition is satisfied: 0.8 ≦ InS/HOS ≦ 1 whereby 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 the present invention, the distance between the side of the first lens object and the side of the fourth lens image is InTL, and the total thickness of all lenses having refractive power on the optical axis is ΣTP, which satisfies the following condition: 0.45 ≦Σ TP/ InTL ≦ 0.95. Preferably, the following conditions are satisfied: 0.6 ≦Σ TP / InTL ≦ 0.9. Thereby, the contrast of the system imaging and the yield of the lens manufacturing can be simultaneously taken into consideration and an appropriate back focus can be provided to accommodate other components.

The radius of curvature of the side surface of the first lens object is R1, and the radius of curvature of the side surface of the first lens image is R2, which satisfies the following condition: 0.01 ≦ | R1/R2 | ≦ 0.5. Thereby, the first lens is provided with an appropriate positive refractive power to prevent the spherical aberration from increasing excessively. Preferably, the following conditions are satisfied: 0.01 ≦ | R 1 / R 2 | ≦ 0.4.

The radius of curvature of the side surface of the fourth lens object is R7, and the radius of curvature of the side surface of the fourth lens image is R8, which satisfies the following condition: -200 < (R7 - R8) / (R7 + R8) < 30. Thereby, it is advantageous to correct the optical imaging system The resulting astigmatism.

The distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following condition: 0 < IN12 / f ≦ 0.25. Preferably, the following conditions are satisfied: 0 < IN12 / f ≦ 60. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

The distance between the second lens and the third lens on the optical axis is IN23, which satisfies the following condition: 0 < IN23 / f ≦ 0.25. Preferably, the following conditions are satisfied: 0.01 ≦ IN23/f ≦ 0.20. Thereby, it helps to improve the performance of the lens.

The distance between the third lens and the fourth lens on the optical axis is IN34, which satisfies the following condition: 0 < IN34 / f ≦ 0.25. Preferably, the following conditions are satisfied: 0.001 ≦ IN34/f ≦ 0.20. Thereby, it helps to improve the performance of the lens.

The thicknesses of the first lens and the second lens on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: 1 ≦ (TP1 + IN12) / TP2 ≦ 10. Thereby, it helps to control the sensitivity of the optical imaging system manufacturing and improve its performance.

The thicknesses of the third lens and the fourth lens on the optical axis are TP3 and TP4, respectively, and the distance between the two lenses on the optical axis is IN34, which satisfies the following condition: 1≦(TP4+IN34)/TP3≦10. Thereby, it helps to control the sensitivity of the optical imaging system manufacturing and reduce the overall height of the system.

The distance between the second lens and the third lens on the optical axis is IN23, and the total distance of the first lens to the fourth lens on the optical axis is Σ TP, which satisfies the following condition: 0.01≦IN23/(TP2+IN23+TP3 )≦0.5. Preferably, the following conditions are satisfied: 0.05 ≦ IN23 / (TP2+IN23 + TP3) ≦ 0.4. This helps the layer to slightly correct the aberration generated by the incident light and reduce the total height of the system.

In the optical imaging system of the present invention, the horizontal displacement distance of the fourth lens object side surface 142 from the intersection on the optical axis to the maximum effective radius position of the fourth lens object side 142 on the optical axis is InRS41 (if the horizontal displacement is toward the image side, InRS41 Positive value; if the horizontal displacement is toward the object side, InRS41 is negative), The maximum effective radius position of the four lens image side surface 144 on the optical axis to the fourth lens image side surface 144 is the horizontal displacement distance of the optical axis is InRS42, and the thickness of the fourth lens 140 on the optical axis is TP4, which satisfies the following conditions : -1 mm ≦ InRS 41 ≦ 1 mm; -1 mm ≦ InRS 42 ≦ 1 mm; 1 mm ≦ | InRS41 | + | InRS42 | ≦ 2 mm; 0.01 ≦ | InRS41 | / TP4 ≦ 10; 0.01 ≦ | InRS42 | / TP4 ≦ 10. Thereby, the position of the maximum effective radius between the two faces of the fourth lens can be controlled, which contributes to the aberration correction of the peripheral field of view of the optical imaging system and effectively maintains the miniaturization thereof.

In the optical imaging system of the present invention, the horizontal displacement distance parallel to the optical axis between the intersection of the fourth lens object side on the optical axis and the inversion point of the optical axis of the fourth lens object side is represented by SGI411, and the fourth lens image The horizontal displacement distance parallel to the optical axis between the intersection of the side on the optical axis and the inflection point of the optical axis closest to the side of the fourth lens image is represented by SGI421, which satisfies the following condition: 0<SGI411/(SGI411+TP4)≦0.9 ; 0 < SGI421 / (SGI421 + TP4) ≦ 0.9. Preferably, the following conditions are satisfied: 0.01 < SGI411 / (SGI411 + TP4) ≦ 0.7; 0.01 < SGI421 / (SGI421 + TP4) ≦ 0.7.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the fourth lens object on the optical axis to the inflection point of the second lens object and the second optical axis is represented by SGI 412, and the side of the fourth lens image is on the optical axis. The horizontal displacement distance parallel to the optical axis between the intersection point and the inflection point of the second lens image side of the fourth lens image side is represented by SGI422, which satisfies the following condition: 0<SGI412/(SGI412+TP4)≦0.9; 0<SGI422 /(SGI422+TP4)≦0.9. Preferably, the following conditions are satisfied: 0.1 ≦ SGI 412 / (SGI 412 + TP 4 ) ≦ 0.8; 0.1 ≦ SGI 422 / (SGI 422 + TP 4 ) ≦ 0.8.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the fourth lens object is represented by HIF411, and the intersection of the fourth lens image side on the optical axis and the optical axis of the optical axis near the side of the fourth lens image The vertical distance between them is represented by HIF421, which satisfies the following conditions: 0.01 ≦ HIF411/HOI ≦ 0.9; 0.01 ≦ HIF421/HOI ≦ 0.9. Preferably, the following conditions are met: 0.09≦ HIF411/HOI≦0.5; 0.09≦HIF421/HOI≦0.5.

The vertical distance between the inflection point of the second lens object near the optical axis and the optical axis is represented by HIF412, and the intersection of the fourth lens image side on the optical axis to the fourth lens image side and the second optical axis is reversed. The vertical distance between the point and the optical axis is represented by HIF 422, which satisfies the following conditions: 0.01 ≦ HIF 412 / HOI ≦ 0.9; 0.01 ≦ HIF 422 / HOI ≦ 0.9. Preferably, the following conditions are satisfied: 0.09 ≦ HIF 412 / HOI ≦ 0.8; 0.09 ≦ HIF 422 / HOI ≦ 0.8.

The vertical distance between the inflection point of the third lens object near the optical axis and the optical axis is represented by HIF413, and the intersection of the fourth lens image side on the optical axis to the fourth lens image side and the third optical axis is reversed. The vertical distance between the point and the optical axis is represented by HIF 423, which satisfies the following conditions: 0.001 mm ≦ | HIF 413 | ≦ 5 mm; 0.001 mm ≦ | HIF 423 | ≦ 5 mm. Preferably, the following conditions are satisfied: 0.1 mm ≦ | HIF 423 | ≦ 3.5 mm; 0.1 mm ≦ | HIF 413 | ≦ 3.5 mm.

The vertical distance between the inflection point of the fourth lens side near the optical axis and the optical axis is represented by HIF 414, and the intersection of the fourth lens image side on the optical axis and the fourth lens image side is close to the optical axis. The vertical distance between the point and the optical axis is represented by HIF 424, which satisfies the following conditions: 0.001 mm ≦ | HIF 414 | ≦ 5 mm; 0.001 mm ≦ | HIF 424 | ≦ 5 mm. Preferably, the following conditions are satisfied: 0.1 mm ≦ | HIF 424 | ≦ 3.5 mm; 0.1 mm ≦ | HIF 414 | ≦ 3.5 mm.

An embodiment of the optical imaging system of the present invention can assist in the correction of the chromatic aberration of the optical imaging system by staggering the lenses having a high dispersion coefficient and a low dispersion coefficient.

The above aspheric equation is: z = ch ² / [1 + [1 (k + 1) c ² h ² ] ^0.5 ] + A4h ⁴ + A6h ⁶ + A8h ⁸ + A10h ¹⁰ + A12h ¹² + A14h ¹⁴ + A16h ¹⁶ +A18h ¹⁸ +A20h ²⁰ +... (1)

Where z is the position value at the height h of the position along the optical axis with reference to the surface apex, k is the cone coefficient, c is the reciprocal of the radius of curvature, and A4, A6, A8, A10, A12, A14, A16, A18, and A20 are high-order aspherical coefficients.

In the optical imaging system provided by the present invention, the lens may be made of plastic or glass. When the lens is made of plastic, it can effectively reduce production cost and weight. In addition, when the lens is made of glass, it can control the thermal effect and increase the design space of the optical imaging system's refractive power configuration. In addition, the object side and the image side of the first to fourth lenses in the optical imaging system may be aspherical, which can obtain more control variables, in addition to reducing aberrations, compared to the use of conventional glass lenses. The number of lenses used can be reduced, thus effectively reducing the overall height of the present optical imaging system.

Furthermore, in the optical imaging system provided by the present invention, if the surface of the lens is convex, it indicates that the surface of the lens is convex at the near-optical axis; if the surface of the lens is concave, it indicates that the surface of the lens is concave at the near-optical axis.

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

The optical imaging system of this creation is more suitable for the optical system of moving focus, 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 further includes a driving module that can be coupled to the lenses and cause displacement of 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 defocus caused by lens vibration during the shooting process.

The optical imaging system of the present invention further requires that at least one of the first lens, the second lens, the third lens, and the fourth lens be a light filtering component having a wavelength of less than 500 nm, which can be filtered by the specific filtering function. The coating of at least one surface of the lens or the lens itself is achieved by a material having a short wavelength that can be filtered out.

The imaging surface of the optical imaging system of this creation is more visually selectable Choose a plane or a surface. When the imaging surface is a curved surface (for example, a spherical surface having 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 (TTL) of the miniature optical imaging system, Illumination also helps.

One aspect of the present invention is to provide a plastic lens positioning component which can be integrally formed. In addition to accommodating and positioning the lens of the present invention, the outer wall of the plastic lens positioning component further comprises at least two moldings. The irrigating marks can be arranged symmetrically around a central axis (for example, the optical axis) according to requirements, which can produce a relatively uniform thickness configuration and enhance the structural strength. If the outer wall of the plastic lens positioning element has two forming nozzle marks, the angle between the forming nozzle marks can be 180 degrees. If the outer wall of the plastic lens positioning element has three forming nozzle marks, the angle between the forming nozzle marks can be 120 degrees. The forming nozzle mark may be disposed on the outer wall of the object end or on the outer wall of the image end portion as required.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the light of the above-described embodiments, the specific embodiments are described below in detail with reference to the drawings.

First embodiment

Please refer to FIG. 1A and FIG. 1B , wherein FIG. 1A is a schematic diagram of an optical imaging system according to a first embodiment of the present invention. FIG. 1B is a left-to-right sequential optical imaging system of the first embodiment. Spherical aberration, astigmatism and optical distortion curves. 1C is a lateral aberration diagram of the meridional plane fan and the sagittal plane fan of the optical imaging system of the first embodiment, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view. As can be seen from FIG. 1A, the optical imaging system 10 includes the aperture 100, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the infrared filter 170, and the imaging surface in this order from the object side to the image side. 180 and image sensing component 190.

The first lens 110 has a positive refractive power and is made of a plastic material. The object side surface 112 is a convex surface, and the image side surface 114 is a concave surface, and both are aspherical surfaces, and the object side surface 112 and the image side surface 114 each have an inflection point. First lens The length of the profile curve of the maximum effective radius of the side of the object is represented by ARS11, and the length of the profile curve of the maximum effective radius of the side of the first lens image is represented by ARS12. The length of the profile curve of the 1/2 incident pupil diameter (HEP) of the side of the first lens object is represented by ARE11, and the length of the profile curve of the 1/2 incident pupil diameter (HEP) of the side of the first lens image is represented by ARE12. The thickness of the first lens on the optical axis is TP1.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the first lens object on the optical axis and the inversion point of the optical axis of the first lens object is represented by SGI 111, and the intersection of the side of the first lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the first lens image side is represented by SGI121, which satisfies the following conditions: SGI111=0.2008mm; SGI121=0.0113mm; |SGI111|/(|SGI111|+ TP1)=0.3018;|SGI121|/(|SGI121|+TP1)=0.0238.

The vertical distance between the inflection point of the optical axis and the optical axis of the first lens object on the optical axis to the side of the first lens object is represented by HIF111, and the intersection of the first lens image side on the optical axis to the first through The vertical distance between the inflection point of the nearest optical axis and the optical axis of the mirror side is represented by HIF121, which satisfies the following conditions: HIF111=0.7488 mm; HIF121=0.4451 mm; HIF111/HOI=0.2552; HIF121/HOI=0.1517.

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

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the second lens object on the optical axis and the inversion point of the optical axis of the second lens object is represented by SGI211, and the intersection of the side of the second lens image on the optical axis is Second lens image The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the side surface is represented by SGI221, which satisfies the following condition: SGI211=-0.1791 mm; |SGI211|/(|SGI211|+TP2)=0.3109.

The vertical distance between the intersection of the side of the second lens object on the optical axis and the optical axis of the second lens object to the optical axis is represented by HIF211, and the intersection of the second lens image side on the optical axis to the second through The vertical distance between the inflection point of the nearest optical axis and the optical axis of the mirror side is represented by HIF221, which satisfies the following conditions: HIF211=0.8147 mm; HIF211/HOI=0.2777.

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

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the third lens object on the optical axis and the inversion point of the optical axis of the third lens object is represented by SGI311, and the intersection of the side of the third lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the third lens image side is represented by SGI 321, which satisfies the following condition: SGI321=-0.1647 mm; |SGI321|/(|SGI321|+TP3)=0.1884 .

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the third lens object is represented by HIF311, and the intersection of the third lens image side on the optical axis and the optical axis of the optical axis near the side of the third lens image The vertical distance between them is represented by HIF 321, which satisfies the following conditions: HIF321 = 0.7269 mm; HIF321 / HOI = 0.2477.

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

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the fourth lens object on the optical axis and the inversion point of the optical axis of the fourth lens object is indicated by SGI411, and the intersection of the side of the fourth lens image on the optical axis is The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis of the fourth lens image side is represented by SGI421, which satisfies the following conditions: SGI411=0.0137 mm; SGI421=0.0922 mm; |SGI411|/(|SGI411|+ TP4)=0.0155;|SGI421|/(|SGI421|+TP4)=0.0956.

The horizontal displacement distance parallel to the optical axis between the intersection of the side of the fourth lens object on the optical axis and the inversion point of the second lens object near the optical axis is represented by SGI 412, which satisfies the following condition: SGI412=-0.1518mm ;|SGI412|/(|SGI412|+TP4)=0.1482.

The vertical distance between the inflection point of the optical axis and the optical axis of the side of the fourth lens object is represented by HIF411, and the vertical distance between the inflection point of the optical axis of the fourth lens image and the optical axis is represented by HIF411, which satisfies the following conditions : HIF411 = 0.2890 mm; HIF421 = 0.5794 mm; HIF411/HOI = 0.0985; HIF421/HOI = 0.11975.

The vertical distance between the inflection point of the second near-optical axis of the fourth lens object and the optical axis is represented by HIF 412, which satisfies the following conditions: HIF412 = 1.3328 mm; HIF412 / HOI = 0.4543.

The infrared filter 170 is made of glass and is disposed between the fourth lens 140 and the imaging surface 180 without affecting the focal length of the optical imaging system.

In the optical imaging system of the first embodiment, the optical imaging system The focal length is f, the entrance pupil diameter of the optical imaging system is HEP, and the half of the maximum viewing angle in the optical imaging system is HAF. The values are as follows: f=3.4375mm; f/HEP=2.23; and HAF=39.69 degrees and tan(HAF) =0.8299.

In the optical imaging system of the first embodiment, the focal length of the first lens 110 is f1, and the focal length of the fourth lens 140 is f4, which satisfies the following conditions: f1 = 3.2736 mm; |f/f1| = 1.0501; f4 = -8.3381 Mm; and |f1/f4|=0.3926.

In the optical imaging system of the first embodiment, the focal lengths of the second lens 120 to the third lens 130 are f2 and f3, respectively, which satisfy the following conditions: |f2|+|f3|=10.0976 mm; |f1|+|f4| =11.6116mm and |f2|+|f3|<|f1|+|f4|.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens having a positive refractive power, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens having a negative refractive power, the optical of the first embodiment In the imaging system, the sum of the PPRs of all positive refractive power lenses is ΣPPR=|f/f1|+|f/f2|=1.95585, and the NPR sum of all negative refractive power lenses is ΣNPR=|f/f3|+|f /f4|=0.95770, Σ PPR/|Σ NPR|=2.04224. The following conditions are also satisfied: |f/f1|=1.05009;|f/f2|=0.90576;|f/f3|=0.54543;|f/f4|=0.41227.

In the optical imaging system of the first embodiment, the distance between the first lens object side surface 112 to the fourth lens image side surface 144 is InTL, and the distance between the first lens object side surface 112 and the imaging surface 180 is HOS, and the aperture 100 to the imaging surface The distance between 180 is InS, the half of the diagonal length of the effective sensing region of the image sensing element 190 is HOI, and the distance between the fourth lens image side 144 and the imaging surface 180 is InB, which satisfies the following condition: InTL+InB= HOS; 4.6250 mm; HOI=2.9340 mm; HOS/HOI=1.5082; HOS/f=1.2873; InTL/HOS=0.7191; InS=4.2128 mm; and InS/HOS=0.95204.

In the optical imaging system of the first embodiment, the sum of the thicknesses of all the refractive power lenses on the optical axis is Σ TP, which satisfies the following conditions: TP = 2.4437 mm; and Σ TP / InTL = 0.77673. Thereby, the contrast of the system imaging and the yield of the lens manufacturing can be simultaneously taken into consideration and an appropriate back focus can be provided to accommodate other components.

In the optical imaging system of the first embodiment, the radius of curvature of the first lens object side surface 112 is R1, and the radius of curvature of the first lens image side surface 114 is R2, which satisfies the following condition: |R1/R2|=0.1853. Thereby, the first lens is provided with an appropriate positive refractive power to prevent the spherical aberration from increasing excessively.

In the optical imaging system of the first embodiment, the radius of curvature of the fourth lens object side surface 142 is R7, and the radius of curvature of the fourth lens image side surface 144 is R8, which satisfies the following condition: (R7-R8) / (R7 + R8) =0.2756. Thereby, it is advantageous to correct the astigmatism generated by the optical imaging system.

In the optical imaging system of the first embodiment, the individual focal lengths of the first lens 110 and the second lens 120 are f1 and f2, respectively, and the total focal length of all lenses having positive refractive power is Σ PP, which satisfies the following conditions: Σ PP = F1 + f2 = 7.0688 mm; and f1/(f1 + f2) = 0.4631. Thereby, it is helpful to appropriately distribute the positive refractive power of the first lens 110 to other positive lenses to suppress the generation of significant aberrations during the traveling of the incident light.

In the optical imaging system of the first embodiment, the respective focal lengths of the third lens 130 and the fourth lens 140 are f3 and f4, respectively, and the sum of the focal lengths of all lenses having negative refractive power is Σ NP, which satisfies the following condition: Σ NP = F3 + f4 = -14.6405 mm; and f4 / (f2 + f4) = 0.5695. Thereby, it is helpful to appropriately distribute the negative refractive power of the fourth lens to the other negative lenses to suppress the generation of significant aberrations during the traveling of the incident light.

In the optical imaging system of the first embodiment, the distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which satisfies the following conditions: IN12=0.3817 mm; IN12/f=0.11105. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of the first embodiment, the distance between the second lens 120 and the third lens 130 on the optical axis is IN23, which satisfies the following conditions: IN23=0.0704mm; IN23/f=0.02048. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of the first embodiment, the distance between the third lens 130 and the fourth lens 140 on the optical axis is IN34, which satisfies the following conditions: IN34=0.2863 mm; IN34/f=0.08330. Thereby, it helps to improve the chromatic aberration of the lens to improve its performance.

In the optical imaging system of the first embodiment, the thicknesses of the first lens 110 and the second lens 120 on the optical axis are TP1 and TP2, respectively, which satisfy the following conditions: TP1=0.46442 mm; TP2=0.39686 mm; TP1/TP2= 1.17023 and (TP1+IN12)/TP2=2.13213. Thereby, it helps to control the sensitivity of the optical imaging system manufacturing and improve its performance.

In the optical imaging system of the first embodiment, the thicknesses of the third lens 130 and the fourth lens 140 on the optical axis are TP3 and TP4, respectively, and the distance between the two lenses on the optical axis is IN34, which satisfies the following condition: TP3 =0.70989mm; TP4=0.87253mm; TP3/TP4=0.81359 and (TP4+IN34)/TP3=1.63248. Thereby, it 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 the first embodiment, it satisfies the following condition: IN23/(TP2+IN23+TP3)=0.05980. This helps the layer to slightly correct the aberration generated by the incident light and reduce the total height of the system.

In the optical imaging system of the first embodiment, the horizontal displacement distance of the fourth lens object side surface 142 from the intersection on the optical axis to the maximum effective radius position of the fourth lens object side 142 on the optical axis is InRS41, and the fourth lens image side 144 The horizontal effective displacement distance from the intersection of the intersection on the optical axis to the fourth lens image side 144 on the optical axis is InRS42, and the thickness of the fourth lens 140 on the optical axis is TP4, which satisfies the following condition: InRS41=-0.23761 Mm; InRS42=-0.20206mm; |InRS41|+|InRS42|=0.43967mm;|InRS41|/TP4=0.27232; and |InRS42|/TP4=0.23158. This is advantageous for lens fabrication and molding, and effectively maintains its miniaturization.

In the optical imaging system of the embodiment, the vertical distance between the critical point C41 of the fourth lens object side surface 142 and the optical axis is HVT41, and the vertical distance between the critical point C42 of the fourth lens image side surface 144 and the optical axis is HVT42, which satisfies the following Conditions: HVT41 = 0.5695 mm; HVT42 = 1.3556 mm; HVT41 / HVT42 = 0.4201. Thereby, the aberration of the off-axis field of view can be effectively corrected.

The optical imaging system of this embodiment satisfies the following conditions: HVT42/HOI = 0.4620. Thereby, it contributes to the aberration correction of the peripheral field of view of the optical imaging system.

The optical imaging system of this embodiment satisfies the following conditions: HVT42/HOS = 0.3063. Thereby, it contributes to the aberration correction of the peripheral field of view of the optical imaging system.

In the optical imaging system of the first embodiment, the first lens has a dispersion coefficient of NA1, the second lens has a dispersion coefficient of NA2, the third lens has a dispersion coefficient of NA3, and the fourth lens has a dispersion coefficient of NA4, which satisfies the following conditions. :|NA1-NA2|=0; NA3/NA2=0.39921. Thereby, it contributes to the correction of the chromatic aberration of the optical imaging system.

In the optical imaging system of the first embodiment, the optical imaging system is in the image formation

The TV distortion is changed to TDT, and the optical distortion at the time of image formation becomes ODT, which satisfies the following conditions: |TDT|=0.4%;|ODT|=2.5%.

In the optical imaging system of the present embodiment, the longest operating wavelength of the forward meridional plane fan pattern is incident on the imaging plane through the aperture edge. The lateral aberration of the field of view is represented by PLTA, which is 0.001 mm (pixel size Pixel Size is 1.12). Μm), the shortest working wavelength of the forward meridional plane fan pattern is incident on the imaging plane through the aperture edge. The lateral aberration of the field of view is represented by PSTA, which is 0.004 mm (Pixel Size is 1.12 μm), negative meridian The longest working wavelength of the surface fan pattern is incident on the imaging surface through the aperture edge. The lateral aberration of the field of view is represented by NLTA, which is 0.003 mm (Pixel Size is 1.12 μm), and the shortest radial meroscopic fan pattern is the shortest. Operating wavelength incident through the edge of the aperture The lateral aberration of the 0.7 field of view on the imaging plane is represented by NSTA, which is -0.003 mm (Pixel Size is 1.12 μm). The longest working wavelength of the sagittal plane fan pattern is incident on the imaging plane through the aperture edge. The lateral aberration of the field of view is represented by SLTA, which is 0.003 mm (Pixel Size is 1.12 μm), and the shortest operation of the sagittal plane fan pattern The wavelength is incident on the imaging plane through the aperture edge. The lateral aberration of the field of view is represented by SSTA, which is 0.004 mm (Pixel Size is 1.12 μm).

Referring to FIG. 7 , the lens positioning component 794 of the embodiment is hollow and can accommodate any lens, and the lens segments are arranged on the optical axis. The lens positioning component includes an object end 796 and a Like the end portion 798, the object end portion 796 is adjacent to the object side and has a first opening 7792. The image end portion 798 has a second opening 7982 near the image side. The outer wall of the lens positioning member 794 includes two tangent planes 799. The cut planes 799 each have a molded irritant 7992. The inner diameter of the first opening 7792 is OD, and the inner diameter of the second opening 7982 is ID, which satisfies the following conditions: OD=0.8 mm; ID=2.82 mm; OD/ID=0.2837. The minimum thickness of the object end 796 is OT and the minimum thickness of the image end 798 is IT, which satisfies the following conditions: OT = 0.1 mm; IT = 0.3 mm; OT / IT = 0.33.

Refer to Table 1 and Table 2 below for reference.

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

Table 1 is the detailed structural data of the first embodiment of Fig. 1, in which the unit of curvature radius, thickness, distance, and focal length is mm, and the surface 0-14 sequentially indicates the surface from the object side to the image side. Table 2 is the aspherical data in the first embodiment, wherein the cone surface coefficients in the a-spherical curve equation of k, and A1-A20 represent the first--20th-order aspheric coefficients of each surface. In addition, the following table of the embodiments corresponds to the schematic diagram and the aberration diagram of the respective embodiments, and the definitions of the data in the table are the same as those of the first embodiment and the second embodiment, and are not described herein.

Second embodiment

Please refer to FIG. 2A and FIG. 2B , wherein FIG. 2A is a schematic diagram of an optical imaging system according to a second embodiment of the present invention, and FIG. 2B is a left-to-right sequential optical imaging system of the second embodiment. Spherical aberration, astigmatism and optical distortion curves. 2C is a meridional plane fan and a sagittal plane fan of the optical imaging system of the second embodiment, the longest working wavelength and the shortest working wavelength pass through the aperture A lateral aberration diagram at the edge of the 0.7 field of view. As can be seen from FIG. 2A, the optical imaging system 20 includes the first lens 210, the aperture 200, the second lens 220, the third lens 230, the fourth lens 240, the infrared filter 270, and the imaging surface in this order from the object side to the image side. 280 and image sensing component 290.

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

The second lens 220 has a positive refractive power and is made of a plastic material. The object side surface 222 is a convex surface, and the image side surface 224 is a convex surface, and both are aspherical surfaces.

The third lens 230 has a positive refractive power and is made of a plastic material. The object side surface 232 is a convex surface, the image side surface 234 is a convex surface, and both are aspherical surfaces, and the object side surface 232 has two inflection points and the image side surface 234 has a Recurve point.

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

The infrared filter 270 is made of glass and is disposed between the fourth lens 240 and the imaging surface 280 without affecting the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below.

In the second embodiment, the aspherical curve equation represents the form 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 are not described herein.

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

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

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

Third embodiment

Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of an optical imaging system according to a third embodiment of the present invention, and FIG. 3B is a left-to-right sequential optical imaging system of the third embodiment. Spherical aberration, astigmatism and optical distortion curves. 3C is a lateral aberration diagram of the meridional plane fan and the sagittal plane fan of the optical imaging system of the third embodiment, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view. As can be seen from FIG. 3A, the optical imaging system 30 includes the first lens 310, the aperture 300, the second lens 320, the third lens 330, the fourth lens 340, the infrared filter 370, and the imaging surface in this order from the object side to the image side. 380 and image sensing component 390.

The first lens 310 has a negative refractive power and is made of a plastic material. The object side surface 312 is a convex surface, and the image side surface 314 is a concave surface, and both are aspherical surfaces, and the object side surface 312.

The second lens 320 has a positive refractive power and is made of a plastic material. The object side surface 322 is a convex surface, and the image side surface 324 is a convex surface, and both are aspherical.

The third lens 330 has a positive refractive power and is made of a plastic material. The object side surface 332 is a convex surface, and the image side surface 334 is a convex surface, and both are aspherical surfaces. The object side surface 332 has two inflection points and the image side surface 334 has an inverse surface. Curved point.

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

The infrared filter 370 is made of glass, and is disposed on the fourth through. The mirror 340 and the imaging surface 380 do not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below.

In the third embodiment, the aspherical curve equation represents the form 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 are not described herein.

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

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

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

Fourth embodiment

Please refer to FIG. 4A and FIG. 4B , wherein FIG. 4A is a schematic diagram of an optical imaging system according to a fourth embodiment of the present invention, and FIG. 4B is a left-to-right sequential optical imaging system of the fourth embodiment. Spherical aberration, astigmatism and optical distortion curves. 4C is a lateral aberration diagram of the meridional plane fan and the sagittal plane fan of the optical imaging system of the fourth embodiment, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view. As can be seen from FIG. 4A, the optical imaging system 40 sequentially includes the first lens 410, the aperture 400, the second lens 420, the third lens 430, the fourth lens 440, and the infrared filter 470 from the object side to the image side. Imaging surface 480 and image sensing element 490.

The first lens 410 has a negative refractive power and is made of a plastic material. The object side surface 412 is a convex surface, and the image side surface 414 is a concave surface, and both are aspherical.

The second lens 420 has a positive refractive power and is made of a plastic material. The object side surface 422 is a convex surface, and the image side surface 424 is a convex surface, and both are aspherical.

The third lens 430 has a negative refractive power and is made of a plastic material. The object side surface 432 is a concave surface, and the image side surface 434 is a concave surface, and both are aspherical surfaces.

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

The infrared filter 470 is made of glass and is disposed between the fourth lens 440 and the imaging surface 480 without affecting the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below.

In the fourth embodiment, the aspherical curve equation represents the form 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 are not described herein.

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

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

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

Fifth embodiment

Please refer to FIG. 5A and FIG. 5B , wherein FIG. 5A is a schematic diagram of an optical imaging system according to a fifth embodiment of the present invention, and FIG. 5B is a left-to-right sequential optical imaging system of the fifth embodiment. Spherical aberration, astigmatism and optical distortion Graph. Fig. 5C is a diagram showing the lateral aberration of the meridional plane fan and the sagittal plane fan of the optical imaging system of the fifth embodiment, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view. As can be seen from FIG. 5A, the optical imaging system 50 includes the first lens 510, the aperture 500, the second lens 520, the third lens 530, the fourth lens 540, the infrared filter 570, and the imaging surface in this order from the object side to the image side. 580 and image sensing component 590.

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

The second lens 520 has a positive refractive power and is made of a plastic material. The object side surface 522 is a concave surface, and the image side surface 524 is a convex surface, and both are aspherical.

The third lens 530 has a negative refractive power and is made of a plastic material. The object side surface 532 is a concave surface, and the image side surface 534 is a convex surface, and both are aspherical surfaces.

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

The infrared filter 570 is made of glass and is disposed between the fourth lens 540 and the imaging surface 580 without affecting the focal length of the optical imaging system.

Please refer to the following list IX and Table 10.

In the fifth embodiment, the aspherical curve equation represents the form 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 are not described herein.

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:

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

Sixth embodiment

Please refer to FIG. 6A and FIG. 6B , wherein FIG. 6A is a schematic diagram of an optical imaging system according to a sixth embodiment of the present invention, and FIG. 6B is a left-to-right sequential optical imaging system of the sixth embodiment. Spherical aberration, astigmatism and optical distortion curves. Fig. 6C is a diagram showing the lateral aberration of the meridional plane fan and the sagittal plane fan of the optical imaging system of the sixth embodiment, the longest working wavelength and the shortest working wavelength passing through the aperture edge at 0.7 field of view. As can be seen from FIG. 6A, the optical imaging system 60 includes the first lens 610, the aperture 600, the second lens 620, the third lens 630, the fourth lens 640, the infrared filter 670, and the imaging surface in this order from the object side to the image side. 680 and image sensing component 690.

The first lens 610 has a negative refractive power and is made of a plastic material. The object side surface 612 is a convex surface, and the 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 a plastic material. The object side surface 622 is a concave surface, and the image side surface 624 is convex, and both are aspherical, and the object side surface 622 has an inflection point.

The third lens 630 has a positive refractive power and is made of a plastic material. The object side surface 632 is a convex surface, and the image side surface 634 is a convex surface, and both are aspherical surfaces, and the image side surface 634 has an inflection point.

The fourth lens 640 has a negative refractive power and is made of a plastic material. The object side surface 642 is a convex surface, and the image side surface 644 is a concave surface, and both are aspherical surfaces, and the object side surface 642 and the image side surface 644 have two inflection points.

The infrared filter 670 is made of glass and is disposed between the fourth lens 640 and the imaging surface 680 without affecting the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below.

In the sixth embodiment, the aspherical curve equation represents the form 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 are not described herein.

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:

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

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any person skilled in the art can make various changes and refinements without departing from the spirit and scope of the present creation. The scope is subject to the definition of the scope of the patent application.

The present invention has been particularly shown and described with reference to the exemplary embodiments thereof, and it is understood by those of ordinary skill in the art that the spirit of the present invention as defined by the following claims and their equivalents Various changes in form and detail can be made in the context of the category.

200‧‧ ‧ aperture

210‧‧‧First lens

212‧‧‧ ‧ side

214‧‧‧like side

220‧‧‧second lens

222‧‧‧ ‧ side

224‧‧‧like side

230‧‧‧ third lens

232‧‧‧ ‧ side

234‧‧‧like side

240‧‧‧4th lens

242‧‧‧ ‧ side

244‧‧‧like side

270‧‧‧ imaging surface

280‧‧‧Infrared filter

290‧‧‧Image sensing components

Claims (25)

An optical imaging system comprising, from the object side to the image side, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; and a fourth lens having a refractive power An imaging surface, wherein the lens positioning element is hollow and can accommodate any lens, and the lens sheets are arranged on the optical axis, the lens positioning element includes an object end and a Like the end portion, the object end portion is adjacent to the object side and has a first opening, the image end portion has a second opening near the image side, and the outer wall of the lens positioning member includes at least two cutting planes, the cutting planes having at least two cutting planes respectively a forming nozzle mark, wherein the optical imaging system has four lenses having a refractive power, at least one of the first lens to the fourth lens has a positive refractive power, and the optical imaging system has a focal length f, the optical imaging The entrance pupil diameter of the 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 fourth lens image side has a distance InT on the optical axis. L, half of the maximum viewing angle of the optical imaging system is HAF, and the intersection of any surface of any of the lenses with the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/2 from the optical axis. The length of the contour curve between the two points is the coordinate point at the vertical height of the entrance pupil diameter. ARE, which satisfies the following conditions: 1 ≦ f / HEP ≦ 10; 0 deg < HAF ≦ 150 deg and 0.9 ≦ 2 (ARE / HEP) ≦ 2.0. The optical imaging system of claim 1, wherein the outer wall of the lens positioning element comprises at least three tangential planes, each of the tangential planes having at least one shaped irrigant. The optical imaging system of claim 1, wherein the first opening has an inner diameter of OD and the second opening has an inner diameter of ID, which satisfies the following condition: 0.1 ≦ OD / ID ≦ 10. The optical imaging system of claim 1, wherein the minimum thickness of the end of the object is OT and the minimum thickness of the image end is IT, which satisfies the following condition: 0.1 ≦ OT / IT ≦ 10. The optical imaging system of claim 1, wherein the optical imaging system has a TV distortion at the time of image formation, and the optical imaging system has an imaging height HOI perpendicular to the optical axis on the imaging surface, the optical imaging system The longest working wavelength of the forward meridional plane fan passes through the entrance pupil edge and is incident on the imaging plane at a lateral angle of 0.7HOI, represented by PLTA, and the shortest working wavelength of the forward meridional plane fan passes through the entrance pupil edge and The lateral aberration at 0.7HOI incident on the imaging plane is represented by PSTA, and the longest operating wavelength of the negative meridional fan passes through the entrance pupil edge and is incident on the imaging plane at 0.7HOI, and the lateral aberration is represented by NLTA. The shortest working wavelength of the negative meridional fan passes through the entrance pupil edge and is incident on the imaging plane at 0.7HOI, and the lateral aberration is represented by NSTA. The longest working wavelength of the sagittal plane fan passes through the entrance pupil edge and is incident on the The lateral aberration at 0.7HOI on the imaging surface is represented by SLTA, the most of the sagittal plane fan The short-working wavelength passes through the entrance pupil edge and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by SSTA, which satisfies the following conditions: PLTA ≦ 100 μm; PSTA ≦ 100 μm; NLTA ≦ 100 μm; NSTA ≦ 100 μm ; SLTA ≦ 100 μm; and SSTA ≦ 100 μm; |TDT|<100%. The optical imaging system of claim 1, wherein the imaging surface is selectable as a plane or a curved surface. The optical imaging system of claim 1, wherein an intersection of the object side surface of the fourth lens on the optical axis is a starting point, and the contour of the surface is extended until the surface is perpendicular to the optical axis 1/2 incident 瞳 diameter At the height of the coordinate point, the length of the contour curve between the two points is ARE41, and the intersection of the image side surface of the fourth lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/1 from the optical axis. 2 The focal point of the vertical height of the entrance pupil diameter is ARE42 between the two points, and the thickness of the fourth lens on the optical axis is TP4, which satisfies the following condition: 0.05≦ARE41/TP4≦25; 0.05≦ARE42/TP4≦25. The optical imaging system of claim 1, wherein an intersection of the object side surface of the third lens on the optical axis is a starting point, and the contour of the surface is extended until the surface is perpendicular to the optical axis 1/2 incident 瞳 diameter At the height of the coordinate point, the length of the contour curve between the two points is ARE31, and the intersection of the image side surface of the third lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is separated from the optical axis 1 /2 is the coordinate point at the vertical height of the entrance pupil diameter, and the length of the contour curve between the two points is ARE32. The thickness of the third lens on the optical axis is TP3, which satisfies the following conditions: 0.05 ≦ ARE31 / TP3 ≦ 25; and 0.05 ≦ ARE32 / TP3 ≦ 25. The optical imaging system of claim 1, further comprising an aperture, and having a distance InS from the aperture to the imaging plane on the optical axis, which satisfies the following formula: 0.2 ≦ InS/HOS ≦ 1.1. An optical imaging system comprising, from the object side to the image side, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; and a fourth lens having a refractive power An imaging surface, wherein the lens positioning element is hollow and can accommodate any lens, and the lens sheets are arranged on the optical axis, the lens positioning element includes an object end and a Like the end portion, the object end portion is adjacent to the object side and has a first opening, the image end portion has a second opening near the image side, and the outer wall of the lens positioning member includes at least two cutting planes, the cutting planes having at least two cutting planes respectively a forming nozzle mark, the optical imaging system has four lenses having a refractive power, and at least one surface of at least one of the first lens to the fourth lens has at least one inflection point, and the second lens is At least one lens of the fourth lens has a positive refractive power, the focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging system is HEP, and the first lens object side to the imaging surface has an optical axis a distance HOS, the side of the first lens to the side of the fourth lens image on the optical axis Having a distance InTL, half of the maximum viewing angle of the optical imaging system is HAF, and the intersection of any surface of any of the lenses with the optical axis is the starting point, extending the contour of the surface until the optical axis from the surface The focal length of the 1/2 incident 瞳 diameter at the vertical height is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg and 0.9≦2(ARE /HEP)≦2.0. The optical imaging system of claim 10, wherein the outer wall of the lens positioning element comprises at least three tangential planes, each of the tangential planes having at least one shaped irrigant. The optical imaging system of claim 10, wherein the first opening has an inner diameter of OD and the second opening has an inner diameter of ID, which satisfies the following condition: 0.1 ≦ OD / ID ≦ 10. The optical imaging system of claim 10, wherein the minimum thickness of the end of the object is OT and the minimum thickness of the image end is IT, which satisfies the following condition: 0.1 ≦ OT / IT ≦ 10. The optical imaging system of claim 10, wherein a maximum effective radius of any one of the lenses is represented by EHD, and an intersection of any one of the lenses and the optical axis is a starting point, The contour of the surface is extended until the maximum effective radius of the surface is the end point, and the profile curve length between the two points is ARS, which satisfies the following formula: 0.9 ≦ ARS / EHD ≦ 2.0. The optical imaging system of claim 10, wherein the optical imaging system has an imaging height HOI perpendicular to the optical axis on the imaging surface, The longest operating wavelength of the forward meridional plane of the optical imaging system passes through the entrance pupil edge and is incident on the imaging plane at a lateral angle of 0.7HOI, represented by PLTA, and the shortest operating wavelength of the forward meridional plane fan passes through The lateral aberration at the entrance edge of the entrance pupil and incident on the imaging plane at 0.7HOI is represented by PSTA, and the longest working wavelength of the negative meridional plane fan passes through the entrance pupil edge and is incident on the imaging plane at a lateral angle of 0.7HOI In NLTA, the shortest operating wavelength of the negative meridional fan passes through the entrance pupil edge and is incident on the imaging plane at 0.7HOI, and the lateral aberration is represented by NSTA. The longest operating wavelength of the sagittal fan passes through the entrance pupil edge. And the lateral aberration at 0.7HOI incident on the imaging surface is represented by SLTA, and the shortest operating wavelength of the sagittal plane fan passes through the entrance pupil edge and is incident on the imaging plane at a lateral angle of 0.7HOI, represented by SSTA, The following conditions were met: PLTA ≦ 50 μm; PSTA ≦ 50 μm; NLTA ≦ 50 μm; NSTA ≦ 50 μm; SLTA ≦ 50 μm; and SSTA ≦ 50 μm. The optical imaging system of claim 10, wherein a distance between the first lens and the second lens on the optical axis is IN12, and the following formula is satisfied: 0<IN12/f≦60. The optical imaging system of claim 10, wherein a distance between the third lens and the fourth lens on the optical axis is IN34, and thicknesses of the third lens and the fourth lens on the optical axis are respectively TP3 and TP4, which satisfies the following conditions: 1 ≦ (TP4 + IN34) / TP3 ≦ 10. The optical imaging system of claim 10, wherein a distance between the first lens and the second lens on an optical axis is IN12, the first lens The thicknesses on the optical axis with the second lens are TP1 and TP2, respectively, which satisfy the following conditions: 1 ≦ (TP1 + IN12) / TP2 ≦ 10. The optical imaging system of claim 10, wherein at least one of the first lens, the second lens, the third lens, and the fourth lens is a light filtering element having a wavelength of less than 500 nm. An optical imaging system comprising, from the object side to the image side, a first lens having a refractive power; a second lens having a refractive power; a third lens having a refractive power; and a fourth lens having a refractive power An imaging surface, wherein the lens positioning element is hollow and can accommodate any lens, and the lens sheets are arranged on the optical axis, the lens positioning element includes an object end and a Like the end portion, the object end portion is adjacent to the object side and has a first opening, the image end portion has a second opening near the image side, and the lens positioning member outer wall includes at least three tangential planes, and the tangential planes respectively have at least three tangential planes A forming nozzle mark, the optical imaging system has four lenses having a refractive power, the focal length of the optical imaging system is f, the incident pupil diameter of the optical imaging system is HEP, and the first lens object side to the imaging surface The optical axis has a distance HOS, the first lens object side to the fourth lens image side has a distance InTL on the optical axis, and the half of the maximum viewing angle of the optical imaging system is HAF, the lenses The intersection of any of any one of a lens surface and the optical axis as a starting point, with the extension table The contour of the surface is up to the coordinate point on the surface at a vertical height from the optical axis 1/2 incident 瞳 diameter. The length of the contour curve between the two points is ARE, which satisfies the following condition: 1≦f/HEP≦10; 0deg <HAF≦150deg and 0.9≦2(ARE/HEP)≦2.0. The optical imaging system of claim 20, wherein the first opening has an inner diameter of OD and the second opening has an inner diameter of ID, which satisfies the following condition: 0.1 ≦ OD / ID ≦ 10. The optical imaging system of claim 20, wherein the minimum thickness of the object end is OT and the minimum thickness of the image end is IT, which satisfies the following condition: 1 ≦ OT / IT ≦ 10. The optical imaging system of claim 20, wherein an intersection of the object side surface of the fourth lens on the optical axis is a starting point, and the contour of the surface is extended until the surface is perpendicular to the optical axis 1/2 incident 瞳 diameter At the height of the coordinate point, the length of the contour curve between the two points is ARE41, and the intersection of the image side surface of the fourth lens on the optical axis is the starting point, and the contour of the surface is extended until the surface is 1/1 from the optical axis. 2 The focal point of the vertical height of the entrance pupil diameter is ARE42 between the two points, and the thickness of the fourth lens on the optical axis is TP4, which satisfies the following condition: 0.05≦ARE41/TP4≦25; 0.05≦ARE42/TP4≦25. The optical imaging system of claim 20, wherein an intersection of the object side surface of the third lens on the optical axis is a starting point, and the contour of the surface is extended until the surface is perpendicular to the optical axis 1/2 incident 瞳 diameter Up to the coordinate point of the height, the length of the contour curve between the two points is ARE31, the first The intersection of the image side surface of the three lens on the optical axis is the starting point, and the contour of the surface is extended until the coordinate point on the surface at a vertical height from the optical axis 1/2 incident 瞳 diameter, the contour curve between the two points The length is ARE32, and the thickness of the third lens on the optical axis is TP3, which satisfies the following conditions: 0.05 ≦ ARE31 / TP3 ≦ 25; and 0.05 ≦ ARE32 / TP3 ≦ 25. The optical imaging system of claim 20, wherein the optical imaging system further comprises an aperture, an image sensing component, and a driving module, the image sensing component is disposed on the imaging surface, and the aperture is to the imaging The mask has a distance InS, and the driving module is coupled to the lenses and causes displacement of the lenses, which satisfies the following formula: 0.2 ≦ InS/HOS ≦ 1.1.