CN206757158U - Optical imaging system - Google Patents

Abstract

The utility model discloses an optical imaging system, which includes a first lens, a second lens, a third lens and a fourth lens in order from the object side to the image side. The first lens has positive refractive power, and its object side surface can be convex. The second lens to the third lens have refractive power, and both surfaces of each of the aforementioned lenses can be aspherical. The fourth lens may have negative refractive power, its image side may be concave, and both of its surfaces may be aspherical, wherein at least one surface of the fourth lens has an inflection point. The lenses with refractive power in the optical imaging system are the first lens to the fourth lens. When certain conditions are met, it can have greater light collection and better light path adjustment capabilities to improve imaging quality.

Description

optical imaging system

technical field

The utility model relates to an optical imaging system, in particular to a miniaturized optical imaging system applied to electronic products.

Background technique

In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has increased day by day. The photosensitive component of the general optical system is nothing more than two types of photosensitive coupling device (Charge Coupled Device; CCD) or complementary metal-oxide semiconductor sensor (Complementary Metal-Oxide SemiconduTPor Sensor; CMOSSensor), and with the advancement of semiconductor technology, making The pixel size of photosensitive components is shrinking, and the optical system is gradually developing into the high-pixel field, so the requirements for image quality are also increasing.

The traditional optical system mounted on portable devices mostly adopts two-element or three-element lens structure. However, due to the continuous improvement of pixels in portable devices and end consumers’ demand for large apertures such as low-light and night shooting functions or for The demand for wide viewing angles is, for example, the Selfie function of the front lens. However, the optical system designed with a large aperture often faces the situation of more aberrations resulting in the deterioration of edge imaging quality and the difficulty of manufacturing, while the optical system designed with a wide viewing angle will face an increase in distortion rate of imaging. Existing The advanced optical imaging system can no longer meet the higher-level 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 total pixels and quality of imaging while taking into account the balance design of the miniaturized optical imaging system, has become a very important issue.

Utility model content

The embodiment of the present invention provides an optical imaging system, which can utilize the refractive power of four lenses, the combination of convex surface and concave surface (convex surface or concave surface in the utility model refers to the object side or image side of each lens on the optical axis in principle description of the geometric shape), thereby effectively increasing the amount of light entering the optical imaging system and increasing the viewing angle of the optical imaging system, and at the same time improving the total pixels and quality of imaging, so as to be applied to small electronic products.

The terms and codes of the mechanism component parameters related to the embodiment of the utility model are listed as follows, as a reference for subsequent descriptions:

7A, 7B, 7C, the optical imaging system may include an image sensing module (not shown), the image sensing module includes a substrate and a photosensitive component arranged on the substrate; the optical imaging system includes a first The lens 710 , the second lens 720 , the third lens 730 , and the fourth lens 740 have an imaging surface 780 . In addition, a lens positioning assembly 794 can be included, which is hollow and can accommodate any lens, and these lenses are arranged on the optical axis. The lens positioning assembly includes an object end 796 and an image end 798. The object end 796 has a first opening 7962 near the object side, and the image end 798 has a second opening 7982 near the image side. The outer wall of the lens positioning assembly 794 includes two tangent planes 799, and these tangent planes 799 have a molding pot respectively. Mouth marks 7992. The aforementioned inner diameter of the first opening 7962 is OD, and the inner diameter of the second opening 7982 is ID, which satisfy 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 satisfy the following condition: 0.1≦OT/IT<10.

8A, 8B, 8C, the optical imaging system may include an image sensing module (not shown), the image sensing module includes a substrate and a photosensitive component arranged on the substrate; the optical imaging system includes a first The lens 810 , the second lens 820 , the third lens 830 , and the fourth lens 840 have an imaging surface 880 . In addition, a lens positioning assembly 894 may be included, which is hollow and can accommodate any lens, and arrange these lenses on the optical axis. The lens positioning assembly includes an object end 896 and an image end 898. The object end 896 has a first opening 8962 near the object side, and the image end 898 has a second opening 8982 near the image side. The outer wall of the lens positioning assembly 894 includes three tangent planes 899, and these tangent planes 899 have a molding pot respectively. Mouth marks 8992. The aforementioned inner diameter of the first opening 8962 is OD, and the inner diameter of the second opening 8982 is ID, which satisfy 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 898 is IT, which satisfy the following condition: 0.1≦OT/IT<10.

The terms and codes of lens parameters related to the embodiment of the present utility model are listed as follows, 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 object side of the optical imaging system and the fourth lens image side is represented by InTL; the fourth lens image side of the optical imaging system is represented by The distance to the imaging plane is expressed in InB; InTL+InB=HOS; the distance between the fixed diaphragm (aperture) of the optical imaging system and the imaging plane is expressed in InS; the distance between the first lens and the second lens of the optical imaging system It is indicated by IN12 (example); the thickness of the first lens of the optical imaging system on the optical axis is indicated by TP1 (example).

Material-Dependent Lens Parameters

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

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 chief ray angle is represented by MRA.

Lens parameters related to entrance and exit pupils

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

Parameters related to lens surface arc length and surface profile

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

The contour curve length of 1/2 entrance pupil diameter (HEP) of any surface of a single lens refers to the intersection point of the surface of the lens and the optical axis of the optical imaging system to which it belongs, as the starting point, along the lens from the starting point until the coordinate point on the surface is 1/2 the vertical height of the entrance pupil diameter from the optical axis, the arc length of the curve between the aforementioned two points is the contour curve length of 1/2 the entrance pupil diameter (HEP), and Expressed in AREs. For example, the contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the first lens is represented by ARE11, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the first lens is represented by ARE12. The contour curve length of 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the contour curve length of 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The representation of the length of the contour curve of the 1/2 entrance pupil diameter (HEP) of any surface of the other lenses in the optical imaging system can be deduced by analogy.

Parameters related to lens surface depth

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

Parameters Related to Lens Surface Type

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

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

The inflection point of the second closest to the optical axis on the object side of the fourth lens is IF412, and the sinking amount of this point is SGI412 (example). The horizontal displacement distance parallel to the optical axis between the inflection points of the optical axis, and the vertical distance between the point and the optical axis of IF412 is HIF412 (example). The inflection point of the second closest to the optical axis on the fourth lens image side is IF422, and the sinking amount of this point is SGI422 (example), SGI422 is the intersection point of the fourth lens image side on the optical axis to the second closest The horizontal displacement distance parallel to the optical axis between the inflection points of the optical axis, and the vertical distance between the point and the optical axis of IF422 is HIF422 (example).

The inflection point on the object side of the fourth lens that is third close to the optical axis is IF413, and the sinking amount of this point is SGI413 (example). The horizontal displacement distance between the inflection points of the optical axis parallel to the optical axis, and the vertical distance between the point and the optical axis of IF4132 is HIF413 (example). The inflection point of the fourth lens image side on the third approach to the optical axis is IF423, and the sinking amount of this point is SGI423 (example), SGI423 is the intersection point of the fourth lens image side on the optical axis to the fourth lens image side third approach The horizontal displacement distance parallel to the optical axis between the inflection points of the optical axis, and the vertical distance between the point and the optical axis of IF423 is HIF423 (example).

The inflection point of the fourth lens on the object side of the fourth lens close to the optical axis is IF414, and the sinking amount of this point is SGI414 (example). The horizontal displacement distance parallel to the optical axis between the inflection points of the optical axis, and the vertical distance between the point and the optical axis of IF414 is HIF414 (example). The inflection point of the fourth lens near the optical axis on the image side of the fourth lens is IF424, and the sinking amount of this point is SGI424 (example). The horizontal displacement distance parallel to the optical axis between the inflection points of the optical axis, and the vertical distance between the point and the optical axis of IF424 is HIF424 (example).

The expression of the inflection point on the object side or image side of other lenses and its vertical distance from the optical axis or its sinking amount is compared with the above.

Variables related to aberrations

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

The lateral aberration at the edge of the aperture is represented by STA (STOP Transverse Aberration). To evaluate the performance of a specific optical imaging system, you can use the tangential fan or sagittal fan to calculate the lateral light of any field of view. Aberrations, especially the lateral aberrations of the longest working wavelength (for example, 650nm) and the shortest working wavelength (for example, 470nm) passing through the edge of the aperture are respectively calculated as the standard of excellent performance. The aforementioned coordinate directions of the meridian plane light fan can be further divided into positive direction (upward ray) and negative direction (downward ray). The lateral aberration of the longest working wavelength passing through the edge of the aperture, which is defined as the imaging position of the longest working wavelength incident on the imaging surface of a specific field of view through the edge of the aperture, which is on the imaging surface with the reference wavelength principal ray (for example, the wavelength is 555nm) The distance difference between the two positions of the imaging position of the field of view, the lateral aberration of the shortest working wavelength passing through the edge of the aperture, which is defined as the imaging position of the shortest working wavelength incident on the imaging surface of a specific field of view through the edge of the aperture, which is mainly related to the reference wavelength The distance difference between the two positions of the imaging position of the field of view of the light on the imaging surface, the evaluation of the performance of a specific optical imaging system is excellent, and the shortest and longest working wavelengths can be incident on the imaging surface with a field of view of 0.7 through the edge of the aperture (that is, 0.7 The lateral aberration of the imaging height (HOI) is less than 100 microns (μm) as a test method, and the lateral aberration of the 0.7 field of view incident on the imaging plane at the shortest and longest working wavelengths is less than 80 microns (μm) ) as a test method.

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 visible light of the positive meridian plane light fan of the optical imaging system passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI The lateral aberration is represented by PLTA, the shortest operating wavelength of the visible light of the light fan on the positive meridian plane passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI, and the lateral aberration is represented by PSTA, and the light fan on the negative meridian plane The longest working wavelength of visible light passes through the edge of the entrance pupil and is incident on the imaging surface. The lateral aberration at 0.7HOI is expressed in NLTA. The lateral aberration at 0.7 HOI on the imaging plane is represented by NSTA, and the lateral aberration at 0.7 HOI on the imaging plane is represented by SLTA when the longest operating wavelength of the visible light of the sagittal plane light fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI. The lateral aberration of the shortest operating wavelength of visible light of the sagittal light fan passing through the edge of the entrance pupil and incident on the imaging plane at 0.7 HOI is represented by SSTA.

The utility model provides an optical imaging system. The object side or image side of the fourth lens is provided with an inflection point, which can effectively adjust the incident angle of each field of view on the fourth lens, and correct optical distortion and TV distortion. In addition, the surface of the fourth lens can have a better ability to adjust the optical path, so as to improve the imaging quality.

According to the utility model, an optical imaging system is provided, which sequentially includes a first lens with refractive power from the object side to the image side; a second lens with refractive power; a third lens with refractive power; a fourth lens , has refractive power; an imaging surface; and a lens positioning assembly, wherein the lens positioning assembly is hollow and can accommodate any of the above-mentioned lenses, and arrange the above-mentioned lenses on the optical axis, and the lens positioning assembly includes an object end and an image end, the object end is close to the object side and has a first opening, the image end is close to the image side and has a second opening, the outer wall of the lens positioning assembly includes at least two cutouts The above-mentioned tangent planes have at least one molding injection mark respectively, wherein the optical imaging system has four lenses with refractive power, and at least one lens among the first lens to the fourth lens has positive refractive power, The focal lengths of the first lens to the fourth lens are f1, f2, f3, f4 respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, and the first There is a distance HOS from the object side of the lens to the imaging surface on the optical axis, and a distance InTL from the object side of the first lens to the image side of the fourth lens on the optical axis, and the maximum visual field of the optical imaging system is Half of the angle is HAF, starting from the intersection of any surface of any of the above lenses with the optical axis, along the contour of the surface to a vertical height on the surface that is 1/2 the diameter of the entrance pupil from the optical axis Up to the coordinate point at , the length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg and 0.9≦2(ARE/HEP)≦2.0.

Preferably, the outer wall of the lens positioning assembly includes at least three tangent planes, each of which has at least one molding gate mark.

Preferably, the TV distortion of the optical imaging system during imaging is TDT, the optical imaging system has an imaging height HOI perpendicular to the optical axis on the imaging plane, and the positive meridional plane light fan of the optical imaging system The longest working wavelength of the light fan passing through the edge of the entrance pupil and incident on the imaging surface at 0.7HOI is expressed in PLTA, and the shortest working wavelength of the light fan on the positive meridian plane is passing through the edge of the entrance pupil and incident on the imaging surface The lateral aberration at 0.7 HOI on the surface is represented by PSTA, the longest operating wavelength of the light fan on the negative meridian plane passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI, and is represented by NLTA, the negative The shortest operating wavelength of the meridional plane light fan passes through the edge of the entrance pupil and is incident on the imaging plane. The lateral aberration at 0.7HOI on the imaging plane is represented by SLTA, and the shortest working wavelength of the light fan on the sagittal plane passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by SSTA, which satisfies the following Conditions: PLTA≦100 microns; PSTA≦100 microns; NLTA≦100 microns; NSTA≦100 microns; SLTA≦100 microns; SSTA≦100 microns; and │TDT│<100%.

Preferably, the imaging surface is a plane or a curved surface.

Preferably, starting from the intersection point of the object side of the fourth lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE41, starting from the intersection point of the image side of the fourth lens on the optical axis, along the contour of the surface until the incident distance from the optical axis on the surface is 1/2 As far as the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points is ARE42, and the thickness of the fourth lens on the optical axis is TP4, which satisfies the following conditions: 0.05≦ARE41/TP4≦25; and 0.05 ≦ARE42/TP4≦25.

Preferably, starting from the intersection point of the object side of the third lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE31, starting from the intersection point of the image side of the third lens on the optical axis, along the contour of the surface until the incident distance on the surface is 1/2 from the optical axis Up to the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points 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.

Preferably, an aperture is further included, and there is a distance InS from the aperture to the imaging surface on the optical axis, which satisfies the following formula: 0.2≦InS/HOS≦1.1.

According to the utility model, an optical imaging system is further provided, which sequentially includes a first lens with refractive power from the object side to the image side; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; The lens has a refractive power; an imaging surface; and a lens positioning assembly, wherein the lens positioning assembly is hollow and can accommodate any of the above-mentioned lenses, and arrange the above-mentioned lenses on the optical axis, and the lens positioning assembly includes a An object end portion and an image end portion, the object end portion is close to the object side and has a first opening, the image end portion has a second opening close to the image side, and the outer wall of the lens positioning assembly includes at least two cutouts The above-mentioned tangent planes have at least one molded filling mark respectively, the optical imaging system has four lenses with refractive power, and at least one surface of at least one lens among the first lens to the fourth lens There is at least one inflection point, at least one of the second lens to the fourth lens has positive refractive power, and the focal lengths of the first lens to the fourth lens are f1, f2, f3, f4 respectively , the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, there is a distance HOS from the object side of the first lens to the imaging surface on the optical axis, and the first lens There is a distance InTL on the optical axis from the side of the object to the image side of the fourth lens, half of the maximum viewing angle of the optical imaging system is HAF, and the intersection point between any surface of any lens in the above-mentioned lens and the optical axis As a starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis, the length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg and 0.9≦2(ARE/HEP)≦2.0.

Preferably, the outer wall of the lens positioning assembly includes at least three tangent planes, each of which has at least one molding gate mark.

Preferably, the maximum effective radius of any surface of any of the above-mentioned lenses is expressed in EHD, starting from the intersection of any surface of any of the above-mentioned lenses with the optical axis, along the contour of the surface until the The maximum effective radius of the surface is the end point, and the length of the contour curve between the aforementioned two points is ARS, which satisfies the following formula: 0.9≦ARS/EHD≦2.0.

Preferably, the optical imaging system has an imaging height HOI perpendicular to the optical axis on the imaging plane, and the longest working wavelength of the light fan on the positive meridian plane of the optical imaging system passes through the edge of the entrance pupil and is incident on the The lateral aberration at 0.7 HOI on the imaging plane is represented by PLTA, the shortest operating wavelength of the light fan on the positive meridian plane passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI, and is represented by PSTA, and the negative The longest operating wavelength of the light fan on the meridian plane passes through the edge of the entrance pupil and the lateral aberration incident on the imaging surface at 0.7HOI is expressed in NLTA, and the shortest operating wavelength of the light fan on the negative meridian plane passes through the edge of the entrance pupil and The lateral aberration incident on the imaging surface at 0.7HOI is represented by NSTA, and the lateral aberration incident on the imaging surface at 0.7HOI with the longest operating wavelength of the sagittal plane passing through the edge of the entrance pupil is represented by SLTA , the shortest operating wavelength of the sagittal plane light fan passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7HOI. The lateral aberration is represented by SSTA, which meets the following conditions: PLTA≦50 microns; PSTA≦50 microns; NLTA≦ 50 microns; NSTA≦50 microns; SLTA≦50 microns; and SSTA≦50 microns.

Preferably, the distance between the first lens and the second lens on the optical axis is IN12, and satisfies the following formula: 0<IN12/f≦60.

Preferably, the distance between the third lens and the fourth lens on the optical axis is IN34, and the thicknesses of the third lens and the fourth lens on the optical axis are respectively TP3 and TP4, which meet the following conditions : 1≦(TP4+IN34)/TP3≦10.

Preferably, the distance between the first lens and the second lens on the optical axis is IN12, and the thicknesses of the first lens and the second lens on the optical axis are TP1 and TP2 respectively, which meet the following conditions : 1≦(TP1+IN12)/TP2≦10.

Preferably, at least one lens among the first lens, the second lens, the third lens and the fourth lens is a light filtering component with a wavelength less than 500 nm.

According to the utility model, an optical imaging system is further provided, which sequentially includes a first lens with refractive power from the object side to the image side; a second lens with refractive power; a third lens with refractive power; a fourth lens with refractive power; The lens has a refractive power; an imaging surface; and a lens positioning assembly, wherein the lens positioning assembly is hollow and can accommodate any of the above-mentioned lenses, and arrange the above-mentioned lenses on the optical axis, and the lens positioning assembly includes a An object end portion and an image end portion, the object end portion is close to the object side and has a first opening, the image end portion has a second opening close to the image side, and the outer wall of the lens positioning assembly includes at least three cutouts The above-mentioned tangent planes have at least one molding filling mark respectively, the optical imaging system has four lenses with refractive power, and the focal lengths from the first lens to the fourth lens are f1, f2, f3, f4 respectively , the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, there is a distance HOS from the object side of the first lens to the imaging surface on the optical axis, and the first lens There is a distance InTL on the optical axis from the side of the object to the image side of the fourth lens, half of the maximum viewing angle of the optical imaging system is HAF, and the intersection point between any surface of any lens in the above-mentioned lens and the optical axis As a starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis, the length of the contour curve between the aforementioned two points is ARE, which satisfies the following conditions: 1≦f/HEP≦10; 0deg<HAF≦150deg and 0.9≦2(ARE/HEP)≦2.0.

Preferably, starting from the intersection point of the object side of the fourth lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE41, starting from the intersection point of the image side of the fourth lens on the optical axis, along the contour of the surface until the incident distance from the optical axis on the surface is 1/2 As far as the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points is ARE42, and the thickness of the fourth lens on the optical axis is TP4, which satisfies the following conditions: 0.05≦ARE41/TP4≦25; and 0.05 ≦ARE42/TP4≦25.

Preferably, starting from the intersection point of the object side of the third lens on the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the diameter of the entrance pupil from the optical axis So far, the length of the contour curve between the aforementioned two points is ARE31, starting from the intersection point of the image side of the third lens on the optical axis, along the contour of the surface until the incident distance on the surface is 1/2 from the optical axis Up to the coordinate point at the vertical height of the pupil diameter, the length of the contour curve between the aforementioned two points 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.

Preferably, the optical imaging system also includes an aperture, an image sensor and a driving module, the image sensor is arranged on the imaging surface, and the aperture has a distance InS to the imaging surface, and the driving module It is coupled with each of the lenses and causes each of the lenses to be displaced, which satisfies the following formula: 0.2≦InS/HOS≦1.1.

The length of the contour curve of any surface of a single lens within the maximum effective radius affects the ability of the surface to correct aberrations and the optical path difference between rays in each field of view. The longer the contour curve length is, the better the ability to correct aberrations is. It will increase the difficulty of production, so it is necessary to control the length of the contour curve of any surface of a single lens within the maximum effective radius range, especially the control of the contour curve length (ARS) within the maximum effective radius range of the surface and the surface The proportional relationship (ARS/TP) between the thickness (TP) of the lens on the optical axis. For example, the length of the contour curve of the maximum effective radius on the object side of the first lens is represented by ARS11, the thickness of the first lens on the optical axis is TP1, the ratio between the two is ARS11/TP1, and the maximum effective radius of the first lens on the image side is The length of the profile curve is expressed in ARS12, and the ratio between it and TP1 is ARS12/TP1. The length of the profile curve of the maximum effective radius on the object side of the second lens is represented by ARS21, the thickness of the second lens on the optical axis is TP2, and the ratio between the two is ARS21/TP2, and the profile of the maximum effective radius on the image side of the second lens The length of the curve is expressed in ARS22, and the ratio between it and TP2 is ARS22/TP2. The proportional relationship between the length of the contour curve of the maximum effective radius of any surface of the other lenses in the optical imaging system and the thickness (TP) of the lens on the optical axis to which the surface belongs, and so on.

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

The aforementioned optical imaging system can be used to match an image sensor with a diagonal length of 1/1.2 inch or less, the size of the image sensor is preferably 1/2.3 inch, and the pixel size of the image sensor is less than 1.4 micrometers (μm), Preferably, its pixel size is less than 1.12 micrometers (μm), most preferably its pixel size is less than 0.9 micrometers (μm). In addition, the optical imaging system can be adapted to image sensors with an aspect ratio of 16:9.

The aforementioned optical imaging system is applicable to video recording requirements of more than one million or ten million pixels (such as 4K, 2K or UHD, QHD) and has good image quality.

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

When │f2│+│f3│>│f1│+│f4│, at least one lens passing through the second lens to the third lens has weak positive refractive power or weak negative refractive power. The so-called weak refractive power means that the absolute value of the focal length of a specific 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 and avoid unnecessary aberrations from appearing prematurely. On the contrary, if the second lens At least one lens in the third lens has a weak negative refractive power, and then the aberration of the correction system can be fine-tuned.

The fourth lens can have negative refractive power, and its image side can be concave. Thereby, it is beneficial 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 incident angle of the off-axis field of view light, and further correct the aberration of the off-axis field of view.

Description of drawings

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

FIG. 1A shows a schematic diagram of the optical imaging system of the first embodiment of the present invention;

Fig. 1B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the first embodiment of the present invention in order from left to right;

Fig. 1C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light 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 edge of the aperture at the field of view of 0.7;

Fig. 2A shows the schematic diagram of the optical imaging system of the second embodiment of the present invention;

Fig. 2B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the second embodiment of the present invention in order from left to right;

2C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light 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 edge of the aperture at the field of view of 0.7;

Fig. 3A shows the schematic diagram of the optical imaging system of the third embodiment of the present invention;

Fig. 3B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the third embodiment of the present invention in order from left to right;

Fig. 3C shows the lateral aberration diagram of the meridional light fan and the sagittal light fan of the optical imaging system of the third embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the field of view of 0.7;

Fig. 4A shows the schematic diagram of the optical imaging system of the fourth embodiment of the utility model;

Fig. 4B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the fourth embodiment of the present invention in order from left to right;

Fig. 4C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the fourth embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the field of view of 0.7;

FIG. 5A shows a schematic diagram of the optical imaging system of the fifth embodiment of the present invention;

Fig. 5B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the fifth embodiment of the present invention in order from left to right;

Fig. 5C shows the lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the fifth embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the field of view of 0.7;

FIG. 6A shows a schematic diagram of the optical imaging system of the sixth embodiment of the present invention;

Fig. 6B shows the graphs of spherical aberration, astigmatism and optical distortion of the optical imaging system of the sixth embodiment of the present invention in order from left to right;

6C shows the lateral aberration diagram of the meridian plane light fan and sagittal plane light fan of the optical imaging system of the sixth embodiment of the present invention, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at the 0.7 field of view.

Fig. 7A shows a perspective side view of the lens positioning assembly of the first embodiment of the present invention;

Fig. 7B shows a top view of the lens positioning assembly of the first embodiment of the present invention, the top view direction is from the second opening at the end of the image to the first opening at the end of the object, the outer wall of the lens positioning assembly has two tangent planes, These tangent planes respectively have a forming gate mark;

Fig. 7C shows a cross-sectional view of the lens positioning assembly of the first embodiment of the present invention;

Fig. 8A shows the perspective side view of the lens positioning assembly of the second embodiment to the sixth embodiment of the present invention;

Fig. 8B shows the top view of the lens positioning assembly of the second embodiment to the sixth embodiment of the present invention, the top view direction is from the second opening at the end of the image to the first opening at the end of the object, the outer wall of the lens positioning assembly has Three tangent planes, each of which has a forming sprue mark;

Fig. 8C shows a cross-sectional view of the lens positioning assembly of the second embodiment to the sixth embodiment of the present invention.

Explanation of reference signs

Optical imaging system: 10, 20, 30, 40, 50, 60

Aperture: 100, 200, 300, 400, 500, 600

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

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

Like side: 114, 214, 314, 414, 514, 614

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

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

Image side: 124, 224, 324, 424, 524, 624

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

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

Image side: 134, 234, 334, 434, 534, 634

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

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

Image side: 144, 244, 344, 444, 544, 644

Infrared filter: 170, 270, 370, 470, 570, 670

Imaging surface: 180, 280, 380, 480, 580, 680, 780, 880

Image sensor: 190, 290, 390, 490, 590, 690

Lens Positioning Assemblies: 794, 894

Object end: 796, 896

Image end: 798, 898

First opening: 7962, 8962

Second opening: 7982, 8982

Cutting planes: 799, 899

Forming filling marks: 7992, 8992

Focal length of optical imaging system: f

The focal length of the first lens: f1; the focal length of the second lens: f2; the focal length of the third lens: f3;

Focal length of the fourth lens: f4

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

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

Dispersion coefficient of the first lens: NA1

Dispersion coefficients of the second lens to the fourth lens: NA2, NA3, NA4

Radius of curvature on the object side and image side of the first lens: R1, R2

Radius of curvature of the second lens object side and image side: R3, R4

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

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

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

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

The sum of the thicknesses of all lenses with refractive power: ΣTP

Distance between the first lens and the second lens on the optical axis: IN12

Distance between the second lens and the third lens on the optical axis: IN23

Distance between the third lens and the fourth lens on the optical axis: IN34

The horizontal displacement distance from the intersection point of the object side of the fourth lens on the optical axis to the position of the maximum effective radius of the object side of the fourth lens on the optical axis: InRS41

The inflection point closest to the optical axis on the object side of the fourth lens: IF411; the sinking amount at this point: SGI411

Vertical distance between the inflection point closest to the optical axis on the object side of the fourth lens and the optical axis: HIF411

The inflection point closest to the optical axis on the image side of the fourth lens: IF421; sinking amount at this point: SGI421

Vertical distance between the inflection point closest to the optical axis on the image side of the fourth lens and the optical axis: HIF421

The second inflection point close to the optical axis on the object side of the fourth lens: IF412; the sinking amount of this point: SGI412

Vertical distance between the second inflection point close to the optical axis on the object side of the fourth lens and the optical axis: HIF412

The second inflection point close to the optical axis on the image side of the fourth lens: IF422; sinking amount at this point: SGI422

Vertical distance between the second inflection point closest to the optical axis on the image side of the fourth lens and the optical axis: HIF422

The third inflection point close to the optical axis on the object side of the fourth lens: IF413; the sinking amount of this point: SGI413

Vertical distance between the third inflection point close to the optical axis on the object side of the fourth lens and the optical axis: HIF413

The third inflection point close to the optical axis on the image side of the fourth lens: IF423; the amount of sinking at this point: SGI423

Vertical distance between the third inflection point close to the optical axis on the image side of the fourth lens and the optical axis: HIF423

The fourth inflection point close to the optical axis on the object side of the fourth lens: IF414; the sinking amount of this point: SGI414

Vertical distance between the fourth inflection point close to the optical axis on the object side of the fourth lens and the optical axis: HIF414

The fourth inflection point on the image side of the fourth lens close to the optical axis: IF424; the amount of sinking at this point: SGI424

The vertical distance between the fourth inflection point on the image side of the fourth lens closest to the optical axis and the optical axis: HIF424

The critical point on the object side of the fourth lens: C41; the critical point on the image side of the fourth lens: C42

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

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

The vertical distance between the critical point on the object side of the fourth lens and the optical axis: HVT41

The vertical distance between the critical point on the image side of the fourth lens and the optical axis: HVT42

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

Diagonal length of image sensor: Dg; distance from aperture to imaging surface: InS

Distance from the object side of the first lens to the image side of the fourth lens: InTL

Distance from the image side of the fourth lens to the imaging surface: InB

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

TV Distortion (TVDistortion) of the optical imaging system during imaging: TDT

Optical distortion (Optical Distortion) of the optical imaging system during imaging: ODT

detailed description

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

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

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power is NPR, and all lenses with positive refractive power The sum of PPR of powerful lenses is ΣPPR, and the sum of NPR of all lenses with negative refractive power is ΣNPR, which helps to control the total refractive power and total length of the optical imaging system when the following conditions are met: 0.5≦ΣPPR/│ΣNPR│≦ 4.5. Preferably, the following conditions can be met: 1≦ΣPPR/│ΣNPR│≦3.5.

The system height of the optical imaging system is HOS. When the ratio of HOS/f approaches 1, it will be beneficial to manufacture a miniaturized optical imaging system capable of imaging ultra-high pixels.

The sum of the focal lengths fp of each lens with positive refractive power in the optical imaging system is ΣPP, and the focal length sum of each lens with negative refractive power is ΣNP. An 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 may be satisfied: 0<ΣPP≦150; and 0.01≦f1/ΣPP≦0.7. Thereby, it is helpful to control the focusing ability of the optical imaging system, and properly distribute the positive refractive power of the system to suppress the premature occurrence of significant aberrations.

The first lens can have positive refractive power, and its object side can be convex. Thereby, the strength of the positive refractive power of the first lens can be properly adjusted, which helps to shorten the total length of the optical imaging system.

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

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

The fourth lens can have negative refractive power, and its image side can be concave. Thereby, it is beneficial 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 incident angle 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 may further include an image sensor disposed on the imaging surface. Half of the diagonal length of the effective sensing area of the image sensor (that is, the imaging height of the optical imaging system or the maximum image height) is HOI, and the distance from the object side of the first lens to the imaging surface on the optical axis is HOS, which satisfies the following Conditions: HOS/HOI≦3; and 0.5≦HOS/f≦3.0. Preferably, the following conditions may be satisfied: 1≦HOS/HOI≦2.5; and 1≦HOS/f≦2. In this way, the miniaturization of the optical imaging system can be maintained so that it can be mounted on thin and portable electronic products.

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

In the optical imaging system of the present utility model, the aperture configuration can be a front aperture or a middle aperture, wherein the front aperture means that the aperture is set between the subject and the first lens, and the middle aperture means that the aperture is set on the first lens and the imaging surface. If the aperture is a front aperture, it can make the exit pupil of the optical imaging system and the imaging surface have a longer distance to accommodate more optical components, and can increase the efficiency of the image sensor to receive images; if it is a central aperture, it will help To expand the field of view of the system, the optical imaging system has the advantage of a wide-angle lens. The distance between the aforementioned aperture and the imaging surface is InS, which satisfies the following condition: 0.2≦InS/HOS≦1.1. Preferably, the following condition can be satisfied: 0.8≦InS/HOS≦1, whereby the miniaturization of the optical imaging system and the wide-angle characteristic can be maintained at the same time.

In the optical imaging system of the present invention, the distance between the object side of the first lens and the image side of the fourth lens is InTL, and the total thickness ΣTP of all lenses with refractive power on the optical axis satisfies the following conditions: 0.45≦ΣTP/ InTL≦0.95. Preferably, the following condition may be satisfied: 0.6≦ΣTP/InTL≦0.9. In this way, the imaging contrast of the system and the yield rate of lens manufacturing can be taken into account at the same time, and an appropriate back focus can be provided to accommodate other components.

The curvature radius of the object side of the first lens is R1, and the curvature radius of the image side of the first lens is R2, which satisfy the following conditions: 0.01≦│R1/R2│≦0.5. In this way, the first lens has an appropriate positive refractive power strength to avoid excessive increase in spherical aberration. Preferably, the following condition can be satisfied: 0.01≦│R1/R2│≦0.4.

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

The distance between the first lens and the second lens on the optical axis is IN12, which satisfies the following condition: 0<IN12/f≦60. Preferably, the following condition can be satisfied: 0.01≦IN12/f≦0.20. In this way, it is helpful to improve the chromatic aberration of the lens and 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 condition can be 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 condition can be 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 respectively TP1 and TP2, which satisfy the following condition: 1≦(TP1+IN12)/TP2≦10. In this way, it helps to control the sensitivity of optical imaging system manufacturing and improve its performance.

The thicknesses of the third lens and the fourth lens on the optical axis are TP3 and TP4 respectively, and the distance between the above two lenses on the optical axis is IN34, which satisfies the following condition: 1≦(TP4+IN34)/TP3≦10. Thereby, it is helpful to control the sensitivity of manufacturing the optical imaging system 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 from the first lens to the fourth lens on the optical axis is ΣTP, which satisfies the following conditions: 0.01≦IN23/(TP2+IN23+TP3) ≦0.5. Preferably, the following condition can be satisfied: 0.05≦IN23/(TP2+IN23+TP3)≦0.4. This helps to slightly correct the aberration caused by the incident light traveling process layer by layer and reduces the overall height of the system.

In the optical imaging system of the present utility model, the horizontal displacement distance on the optical axis from the intersection point of the fourth lens object side 142 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 towards the image side, InRS41 is a positive value; if the horizontal displacement is toward the object side, InRS41 is a negative value), the horizontal displacement distance on the optical axis from the intersection of the fourth lens image side 144 on the optical axis to the maximum effective radius position of the fourth lens image side 144 is InRS42, the thickness of the fourth lens 140 on the optical axis is TP4, which satisfies the following conditions: -1mm≦InRS41≦1mm; -1mm≦InRS42≦1mm; 1mm≦│InRS41│+│InRS42│≦2mm; 0.01≦│InRS41 │/TP4≦10; 0.01≦│InRS42│/TP4≦10. Thereby, the position of the maximum effective radius between the two surfaces of the fourth lens can be controlled, which helps to correct the aberration of the peripheral field of view of the optical imaging system and effectively maintain its miniaturization.

In the optical imaging system of the present utility model, the horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fourth lens on the optical axis and the inflection point of the nearest optical axis on the object side of the fourth lens is represented by SGI411. The horizontal displacement distance parallel to the optical axis between the intersection point of the mirror image side on the optical axis and the inflection point of the nearest optical axis on the image side of the fourth lens is expressed in SGI421, which satisfies the following conditions: 0<SGI411/(SGI411+TP4)≦ 0.9; 0<SGI421/(SGI421+TP4)≦0.9. Preferably, the following conditions can be 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 point of the object side of the fourth lens on the optical axis and the second inflection point close to the optical axis of the object side of the fourth lens is represented by SGI412, and the distance of the image side of the fourth lens on the optical axis The horizontal displacement distance parallel to the optical axis between the intersection point and the second inflection point close to the optical axis on the image side of the fourth lens is expressed in SGI422, which meets the following conditions: 0<SGI412/(SGI412+TP4)≦0.9; 0<SGI422 /(SGI422+TP4)≦0.9. Preferably, the following conditions can be satisfied: 0.1≦SGI412/(SGI412+TP4)≦0.8; 0.1≦SGI422/(SGI422+TP4)≦0.8.

The vertical distance between the inflection point of the nearest optical axis on the object side of the fourth lens and the optical axis is represented by HIF411, from the intersection point of the image side of the fourth lens on the optical axis to the inflection point of the nearest optical axis on the image side of the fourth lens and the optical axis The vertical distance between 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 can be satisfied: 0.09≦HIF411/HOI≦0.5; 0.09≦HIF421/HOI≦0.5.

The vertical distance between the second inflection point close to the optical axis on the object side of the fourth lens and the optical axis is represented by HIF412, and the inflection point from the intersection point of the image side of the fourth lens on the optical axis to the second close to the optical axis on the image side of the fourth lens The vertical distance between the point and the optical axis is represented by HIF422, which satisfies the following conditions: 0.01≦HIF412/HOI≦0.9; 0.01≦HIF422/HOI≦0.9. Preferably, the following conditions can be satisfied: 0.09≦HIF412/HOI≦0.8; 0.09≦HIF422/HOI≦0.8.

The vertical distance between the third inflection point near the optical axis on the object side of the fourth lens and the optical axis is represented by HIF413. The vertical distance between the point and the optical axis is represented by HIF423, which satisfies the following conditions: 0.001mm≦│HIF413│≦5mm; 0.001mm≦│HIF423│≦5mm. Preferably, the following conditions can be met: 0.1mm≦│HIF423│≦3.5mm; 0.1mm≦│HIF413│≦3.5mm.

The vertical distance between the fourth inflection point on the object side of the fourth lens close to the optical axis and the optical axis is represented by HIF414, and the inflection point from the intersection point of the fourth lens image side on the optical axis to the fourth lens image side fourth close to the optical axis The vertical distance between the point and the optical axis is represented by HIF424, which satisfies the following conditions: 0.001mm≦│HIF414│≦5mm; 0.001mm≦│HIF424│≦5mm. Preferably, the following conditions can be met: 0.1mm≦│HIF424│≦3.5mm; 0.1mm≦│HIF414│≦3.5mm.

An embodiment of the optical imaging system of the present utility model can help the correction of the chromatic aberration of the optical imaging system through the staggered arrangement of lenses with high dispersion coefficient and low dispersion coefficient.

The equation for the above aspheric surface is:

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

Among them, z is the position value at the position of height h along the optical axis, taking the surface vertex as a reference, 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 aspheric coefficients.

In the optical imaging system provided by the utility model, the material of the lens can be plastic or glass. When the lens is made of plastic, the production cost and weight can be effectively reduced. In addition, when the material of the lens is glass, the thermal effect can be controlled and the design space of the refractive power configuration of the optical imaging system can be increased. In addition, the object side and image side of the first lens to the fourth lens in the optical imaging system can be aspherical, which can obtain more control variables. In addition to reducing aberrations, compared with the use of traditional glass lenses, even The number of lenses used can be reduced, so the overall height of the optical imaging system of the present invention can be effectively reduced.

Furthermore, in the optical imaging system provided by the utility model, if the lens surface is convex, it means that the lens surface is convex at the near optical axis; if the lens surface is concave, it means that the lens surface is concave at the near optical axis. .

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

The optical imaging system of the present invention can also be applied to the optical system of moving focus according to the requirements, and has the characteristics of excellent aberration correction and good imaging quality, thereby expanding the application level.

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

The optical imaging system of the present invention can also make at least one of the first lens, the second lens, the third lens, and the fourth lens be a light filter component with a wavelength less than 500nm, which can be filtered by the specific tool. At least one surface of the functional lens is coated or the lens itself is made of a material capable of filtering out short wavelengths.

The imaging surface of the optical imaging system of the present utility model can also be selected as a plane or a curved surface according to requirements. When the imaging surface is a curved surface (such as a spherical surface with a radius of curvature), it helps to reduce the incident angle required for the focused light on the imaging surface. In addition to helping to achieve the length (TTL) of the miniaturized optical imaging system, it is also helpful for improving the relative Illumination also helps.

One aspect of the present invention is to provide a plastic lens positioning assembly, the plastic lens positioning assembly can be integrally formed, in addition to accommodating and positioning the lens of the present utility model, the outer wall of the plastic lens positioning assembly also includes at least two A molded gate mark, which can be arranged symmetrically around an axis (such as an optical axis) according to requirements, can produce a relatively uniform thickness configuration and improve structural strength. If the outer wall of the plastic lens positioning component has two forming filling marks, the angle between the forming filling marks can be 180 degrees. If the outer wall of the plastic lens positioning component has three forming filling marks, the angle between the forming filling marks can be 120 degrees. The aforesaid forming gate marks can be arranged on the outer wall of the object end or on the outer wall of the image end according to requirements.

According to the above-mentioned implementation manners, specific embodiments are proposed below and described in detail with reference to the drawings.

first embodiment

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

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

The horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the first lens on the optical axis and the inflection point of the closest optical axis of the object side of the first lens is represented by SGI111, and the intersection point of the image side of the first lens on the optical axis to The horizontal displacement distance parallel to the optical axis between the inflection points of the nearest optical axis on the image side of the first lens 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 intersection point of the object side of the first lens on the optical axis and the inflection point of the nearest optical axis of the object side of the first lens and the optical axis is represented by HIF111, and the intersection point of the image side of the first lens on the optical axis to the first lens The vertical distance between the inflection point of the closest optical axis on the side of the mirror image and the optical axis is represented by HIF121, which satisfies the following conditions: HIF111=0.7488mm; HIF121=0.4451mm; HIF111/HOI=0.2552; HIF121/HOI=0.1517.

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

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

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

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

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

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

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

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

The horizontal displacement distance parallel to the optical axis between the intersection point of the fourth lens object side on the optical axis and the second inflection point close to the optical axis of the fourth lens object side is represented by SGI412, which meets the following conditions: SGI412=-0.1518mm ;│SGI412│/(│SGI412│+TP4)=0.1482.

The vertical distance between the inflection point of the nearest optical axis on the object side of the fourth lens and the optical axis is represented by HIF411, and the vertical distance between the inflection point of the nearest optical axis on the image side of the fourth lens and the optical axis is represented by HIF411, which meet the following conditions : HIF411=0.2890mm; HIF421=0.5794mm; HIF411/HOI=0.0985; HIF421/HOI=0.1975.

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

The infrared filter 170 is made of glass, which is disposed between the fourth lens 140 and the imaging surface 180 and does not affect the focal length of the optical imaging system.

In the optical imaging system of the first embodiment, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, half of the maximum viewing angle in the optical imaging system is HAF, and its numerical value is 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 satisfy the following conditions: f1=3.2736mm; │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│=10.0976mm; │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 with positive refractive power is PPR, and the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power is NPR, the first embodiment In the optical imaging system of , the sum of PPR of all lenses with positive refractive power is ΣPPR＝│f/f1│+│f/f2│＝1.95585, and the sum of NPR of all lenses with negative refractive power is ΣNPR＝│f/f3 │+│f/f4│＝0.95770, ΣPPR/│ΣNPR│＝2.04224. At the same time, the following conditions are also met: │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 112 and the fourth lens image side 144 is InTL, the distance between the first lens object side 112 and the imaging surface 180 is HOS, and the aperture 100 to the imaging surface The distance between 180 is InS, half of the diagonal length of the effective sensing area of the image sensor 190 is HOI, and the distance between the fourth lens image side 144 and the imaging surface 180 is InB, which satisfies the following conditions: InTL+InB=HOS; HOS=4.4250mm; HOI=2.9340mm; HOS/HOI=1.5082; HOS/f=1.2873; InTL/HOS=0.7191; InS=4.2128mm;

In the optical imaging system of the first embodiment, the sum of the thicknesses of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: ΣTP=2.4437 mm; and ΣTP/InTL=0.76793. In this way, the imaging contrast of the system and the yield rate of lens manufacturing can be taken into account at the same time, and an appropriate back focus can be provided to accommodate other components.

In the optical imaging system of the first embodiment, the curvature radius of the first lens object side 112 is R1, and the curvature radius of the first lens image side 114 is R2, which satisfy the following condition: │R1/R2│=0.1853. In this way, the first lens has an appropriate positive refractive power strength to avoid excessive increase in spherical aberration.

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 conditions: (R7-R8)/(R7+R8) = 0.2756. Thereby, it is beneficial to correct the astigmatism generated by the optical imaging system.

In the optical imaging system of the first embodiment, the respective focal lengths of the first lens 110 and the second lens 120 are respectively f1 and f2, and the sum of the focal lengths of all lenses with positive refractive power is ΣPP, which satisfies the following condition: ΣPP=f1+ f2=7.0688mm; and f1/(f1+f2)=0.4631. In this way, it is helpful to properly distribute the positive refractive power of the first lens 110 to other positive lenses, so as to suppress the generation of significant aberrations in the process of incident light traveling.

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 with negative refractive power is ΣNP, which satisfies the following condition: ΣNP=f3+ f4=-14.6405mm; and f4/(f3+f4)=0.5695. Thereby, it is helpful to properly distribute the negative refractive power of the fourth lens element to other negative lenses, so as to suppress the occurrence of significant aberrations during the traveling process of incident light rays.

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=0.3817mm; IN12/f=0.11105. In this way, it is helpful to improve the chromatic aberration of the lens and 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. In this way, it is helpful to improve the chromatic aberration of the lens and 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=0.2863mm; IN34/f=0.08330. In this way, it is helpful to improve the chromatic aberration of the lens and 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 respectively TP1 and TP2, which satisfy the following conditions: TP1=0.46442mm; TP2=0.39686mm; TP1/TP2= 1.17023 and (TP1+IN12)/TP2=2.13213. In this way, it helps to control the sensitivity of 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 aforementioned two lenses on the optical axis is IN34, which satisfies the following conditions: TP3 =0.70989mm; TP4=0.87253mm; TP3/TP4=0.81359 and (TP4+IN34)/TP3=1.63248. Thereby, it is helpful to control the sensitivity of manufacturing the optical imaging system 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 to slightly correct the aberration caused by the incident light traveling process layer by layer and reduces the overall height of the system.

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

In the optical imaging system of the present embodiment, the vertical distance between the critical point C41 of the fourth lens object side 142 and the optical axis is HVT41, and the vertical distance between the critical point C42 of the fourth lens image side 144 and the optical axis is HVT42, which satisfies the following Conditions: HVT41 = 0.5695mm; HVT42 = 1.3556mm; 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 condition: HVT42/HOI=0.4620. Thereby, it is helpful for aberration correction of the peripheral field of view of the optical imaging system.

The optical imaging system of this embodiment satisfies the following condition: HVT42/HOS=0.3063. Thereby, it is helpful for aberration correction of the peripheral field of view of the optical imaging system.

In the optical imaging system of the first embodiment, the dispersion coefficient of the first lens is NA1, the dispersion coefficient of the second lens is NA2, the dispersion coefficient of the third lens is NA3, and the dispersion coefficient of the fourth lens is NA4, which satisfy the following conditions : │NA1-NA2│=0; NA3/NA2=0.39921. Thereby, it is helpful to correct the chromatic aberration of the optical imaging system.

In the optical imaging system of the first embodiment, the TV distortion of the optical imaging system during imaging is TDT, and the optical distortion during imaging is ODT, which satisfy the following conditions: │TDT│=0.4%; │ODT│=2.5%.

In the optical imaging system of the present embodiment, the lateral aberration of the longest operating wavelength of the light fan diagram on the positive meridian plane is incident on the imaging surface at 0.7 field of view by the edge of the aperture, expressed in PLTA, which is 0.001mm (the pixel size Pixel Size is 1.12μm), the shortest operating wavelength of the light fan diagram on the positive meridian plane passes through the edge of the aperture and enters the 0.7 field of view on the imaging plane. The longest working wavelength of the meridian plane light fan diagram passes through the edge of the aperture and the lateral aberration of the 0.7 field of view incident on the imaging surface is expressed in NLTA, which is 0.003mm (Pixel Size is 1.12μm), and the negative meridian plane light fan diagram The lateral aberration of the shortest working wavelength incident on the imaging surface of 0.7 field of view through the edge of the aperture is expressed in NSTA, which is -0.003mm (the pixel size is 1.12μm). The longest working wavelength of the sagittal plane light fan diagram is incident on the imaging surface with a lateral aberration of 0.7 field of view through the edge of the aperture. The lateral aberration of the 0.7 field of view of the working wavelength incident on the imaging surface through the edge of the aperture is represented by SSTA, which is 0.004mm (the pixel size is 1.12μm).

Please refer to Fig. 7, the lens positioning assembly 794 of this embodiment is hollow and can accommodate any lens, and these lenses are arranged on the optical axis, the lens positioning assembly includes an object end 796 and an image end 798 , the object end portion 796 has a first opening 7962 near the object side, the image end portion 798 has a second opening 7982 near the image side, the outer wall of the lens positioning assembly 794 includes two tangent planes 799, these tangent planes 799 Each has a molded gate mark 7992. The aforementioned inner diameter of the first opening 7962 is OD, and the inner diameter of the second opening 7982 is ID, which satisfy the following conditions: OD=0.8mm; ID=2.82mm; 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 satisfy the following conditions: OT=0.1 mm; IT=0.3 mm; OT/IT=0.33.

Then refer to Table 1 and Table 2 below.

Table 2. Aspheric coefficients of the first embodiment

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

Table 1 shows the detailed structural data of the first embodiment in FIG. 1 , where the units of the radius of curvature, thickness, distance and focal length are mm, and surfaces 0-14 represent surfaces from the object side to the image side in turn. Table 2 shows the aspheric surface data in the first embodiment, wherein k represents the cone coefficient in the aspheric curve equation, and A1-A20 represent the 1st-20th order aspheric coefficients of each surface. In addition, the tables of the following embodiments are schematic diagrams and aberration curve diagrams corresponding to the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1 and Table 2 of the first embodiment, and will not be repeated here.

second embodiment

Please refer to FIG. 2A and FIG. 2B, wherein FIG. 2A shows a schematic diagram of an optical imaging system according to the second embodiment of the present invention, and FIG. 2B shows the spherical aberration of the optical imaging system of the second embodiment from left to right , astigmatism and optical distortion curves. 2C is a lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the second embodiment, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at a field of view of 0.7. As can be seen from FIG. 2A, the optical imaging system 20 sequentially includes a first lens 210, an aperture 200, a second lens 220, a third lens 230, a fourth lens 240, an infrared filter 270, an imaging surface 280 and image sensor 290 .

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

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

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

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

The infrared filter 270 is made of glass, which is disposed between the fourth lens 240 and the imaging surface 280 and does not affect the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below.

Table 4. Aspheric coefficients of the second embodiment

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

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

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

According to Table 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 shows a schematic diagram of an optical imaging system according to the third embodiment of the present invention, and FIG. 3B shows the spherical aberration of the optical imaging system of the third embodiment from left to right , astigmatism and optical distortion curves. 3C is a lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the third embodiment, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at a field of view of 0.7. As can be seen from FIG. 3A, the optical imaging system 30 sequentially includes a first lens 310, an aperture 300, a second lens 320, a third lens 330, a fourth lens 340, an infrared filter 370, an imaging surface 380 and image sensor 390 .

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

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

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

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

The infrared filter 370 is made of glass, which is disposed between the fourth lens 340 and the imaging surface 380 and does not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below.

Table six, aspherical coefficients of the third embodiment

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

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

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

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

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

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

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

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

The infrared filter 470 is made of glass, which is disposed between the fourth lens 440 and the imaging surface 480 and does not affect the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below.

Table 8. Aspheric coefficients of the fourth embodiment

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

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

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

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 Figure 5A and Figure 5B, wherein Figure 5A shows a schematic diagram of an optical imaging system according to the fifth embodiment of the present invention, and Figure 5B shows the spherical aberration of the optical imaging system of the fifth embodiment from left to right , astigmatism and optical distortion curves. 5C is a lateral aberration diagram of the meridional plane light fan and the sagittal plane light fan of the optical imaging system of the fifth embodiment, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at a field of view of 0.7. It can be seen from FIG. 5A that the optical imaging system 50 sequentially includes a first lens 510, an aperture 500, a second lens 520, a third lens 530, a fourth lens 540, an infrared filter 570, an imaging surface 580 and image sensor 590 .

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

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

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

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

The infrared filter 570 is made of glass, which is disposed between the fourth lens 540 and the imaging surface 580 and does not affect the focal length of the optical imaging system.

Please refer to Table 9 and Table 10 below.

Table ten, the aspheric coefficient of the fifth embodiment

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

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

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

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 shows a schematic diagram of an optical imaging system according to the sixth embodiment of the present invention, and FIG. 6B shows the spherical aberration of the optical imaging system of the sixth embodiment from left to right , astigmatism and optical distortion curves. 6C is a lateral aberration diagram of the meridian plane light fan and the sagittal plane light fan of the optical imaging system of the sixth embodiment, the longest working wavelength and the shortest working wavelength passing through the edge of the aperture at a field of view of 0.7. It can be seen from FIG. 6A that the optical imaging system 60 includes a first lens 610, an aperture 600, a second lens 620, a third lens 630, a fourth lens 640, an infrared filter 670, an imaging surface 680 and image sensor 690 .

The first lens 610 has negative refractive power and is made of plastic material. The object side 612 is convex, and the image side 614 is concave, both of which are aspherical.

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

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

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

The infrared filter 670 is made of glass, which is disposed between the fourth lens 640 and the imaging surface 680 and does not affect the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below.

Table 12. Aspheric coefficients of the sixth embodiment

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

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

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

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

Although the present utility model has been disclosed as above in terms of implementation, it is not intended to limit the present utility model. Any person skilled in the art may make various modifications and modifications without departing from the spirit and scope of the present utility model. Therefore, the protection scope of the present utility model should be defined by the scope of the appended claims.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that, without departing from the invention as defined by the following claims and their equivalents, Variations in form and detail are possible in spirit and category.

Claims (25)

1. a kind of optical imaging system, it is characterised in that included successively by thing side to image side：

One first lens, there is refracting power；

One second lens, there is refracting power；

One the 3rd lens, there is refracting power；

One the 4th lens, there is refracting power；

One imaging surface；And a lens positioning component, wherein the lens positioning component is in hollow and can house any of the above-described Mirror, and said lens is arranged on optical axis, the lens positioning component includes a thing end and one as end, the thing end Portion is close to thing side and with one first opening, described to be open as end close to image side and with one second, the lens positioning group The outer wall of part includes at least two sections, and there is at least one shaping to fill mouth trace respectively in above-mentioned section, wherein the optics into It it is four pieces as system has the lens of refracting power, first lens at least one piece of lens into the 4th lens, which have, just bends Power is rolled over, the focal length of the optical imaging system is f, and the entrance pupil diameter of the optical imaging system is HEP, and described first is saturating Mirror thing side is to the imaging surface in having a distance HOS, the first lens thing side to the 4th lens picture on optical axis Side is in having a distance InTL on optical axis, the half of the maximum visual angle of the optical imaging system is HAF, with above-mentioned The intersection point of any surface of any lens and optical axis is starting point in mirror, along the profile on the surface until distance on the surface Untill coordinate points at the vertical height of the entrance pupil diameter of optical axis 1/2, the contour curve length of foregoing point-to-point transmission is ARE, its Meet following condition：1≦f/HEP≦10；0deg<HAF≤150deg and 0.9≤2 (ARE/HEP)≤2.0.

2. optical imaging system as claimed in claim 1, it is characterised in that the outer wall of the lens positioning component is included at least There is at least one shaping to fill mouth trace respectively for three sections, above-mentioned section.

3. optical imaging system as claimed in claim 1, it is characterised in that the internal diameter of first opening is OD, described the The internal diameter of two openings is ID, and it meets following condition：0.1≦OD/ID≦10.

4. optical imaging system as claimed in claim 1, it is characterised in that the minimum thickness of the thing end is OT and institute State as the minimum thickness of end is IT, it meets following condition：0.1≦OT/IT≦10.

5. optical imaging system as claimed in claim 1, it is characterised in that TV of optical imaging system when imaging is abnormal Be changed into TDT, the optical imaging system in there is an image height HOI perpendicular to optical axis on the imaging surface, the optics into As the most long operation wavelength that the positive meridian plane light of system is fanned by entrance pupil edge and is incident on the imaging surface Lateral aberration at 0.7HOI represents that the most short operation wavelength of positive meridian plane light fan is incorporated to by entrance pupil edge with PLTA Penetrate the lateral aberration on the imaging surface at 0.7HOI to represent with PSTA, the most long operation wavelength of negative sense meridian plane light fan passes through The entrance pupil edge and lateral aberration being incident on the imaging surface at 0.7HOI is represented with NLTA, negative sense meridian plane light fan Most short operation wavelength represented by entrance pupil edge and the lateral aberration that is incident on the imaging surface at 0.7HOI with NSTA, The most long operation wavelength of sagittal surface light fan passes through entrance pupil edge and the horizontal picture that is incident on the imaging surface at 0.7HOI Difference represents that the most short operation wavelength of sagittal surface light fan by entrance pupil edge and is incident on the imaging surface with SLTA Lateral aberration at 0.7HOI represents that it meets following condition with SSTA：PLTA≤100 micron；PSTA≤100 micron；NLTA ≤ 100 microns；NSTA≤100 micron；SLTA≤100 micron；SSTA≤100 micron；And │ TDT │<100%.

6. optical imaging system as claimed in claim 1, it is characterised in that the imaging surface is a plane or a curved surface.

7. optical imaging system as claimed in claim 1, it is characterised in that with the thing side of the 4th lens on optical axis Intersection point be starting point, along the surface profile until on the surface apart from the vertical height of the entrance pupil diameter of optical axis 1/2 Untill coordinate points at degree, the contour curve length of foregoing point-to-point transmission is ARE41, with the image side surface of the 4th lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE42, and the 4th lens are in the thickness on optical axis TP4, it meets following condition：0.05≦ARE41/TP4≦25；And 0.05≤ARE42/TP4≤25.

8. optical imaging system as claimed in claim 1, it is characterised in that with the thing side of the 3rd lens on optical axis Intersection point be starting point, along the surface profile until on the surface apart from the vertical height of the entrance pupil diameter of optical axis 1/2 Untill coordinate points at degree, the contour curve length of foregoing point-to-point transmission is ARE31, with the image side surface of the 3rd lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE32, and the 3rd lens are in the thickness on optical axis For TP3, it meets following condition：0.05≦ARE31/TP3≦25；And 0.05≤ARE32/TP3≤25.

9. optical imaging system as claimed in claim 1, it is characterised in that also including an aperture, and the aperture is to institute Imaging surface is stated in having a distance InS on optical axis, it meets following equation：0.2≦InS/HOS≦1.1.

10. a kind of optical imaging system, it is characterised in that included successively by thing side to image side：

One first lens, there is refracting power；

One second lens, there is refracting power；

One the 3rd lens, there is refracting power；

One the 4th lens, there is refracting power；

One imaging surface；And

One lens positioning component, wherein the lens positioning component is in hollow and can house any of the above-described lens, and make above-mentioned Mirror is arranged on optical axis, and the lens positioning component includes a thing end and one as end, the thing end close to thing side and With one first opening, described to have one second opening close to image side as end, the outer wall of the lens positioning component is included extremely There is at least one shaping to fill mouth trace respectively for few two sections, above-mentioned section, and the optical imaging system has refracting power Lens are four pieces and a respective at least surface for first lens at least one piece lens into the 4th lens has extremely Few point of inflexion, second lens at least one piece of lens into the 4th lens have positive refracting power, the optical imagery The focal length of system is f, and the entrance pupil diameter of the optical imaging system is HEP, the first lens thing side to it is described into Image planes are in having a distance HOS on optical axis, the first lens thing side to the 4th lens image side surface on optical axis in having One distance InTL, the half of the maximum visual angle of the optical imaging system is HAF, with times of any lens in said lens The intersection point of one surface and optical axis is starting point, along the surface profile until on the surface apart from the entrance pupil of optical axis 1/2 Untill coordinate points at the vertical height of diameter, the contour curve length of foregoing point-to-point transmission is ARE, and it meets following condition：1≦ f/HEP≦10；0deg<HAF≤150deg and 0.9≤2 (ARE/HEP)≤2.0.

11. optical imaging system as claimed in claim 10, it is characterised in that the outer wall of the lens positioning component is included extremely There is at least one shaping to fill mouth trace respectively for few three sections, above-mentioned section.

12. optical imaging system as claimed in claim 10, it is characterised in that the internal diameter of first opening is OD, described The internal diameter of second opening is ID, and it meets following condition：0.1≦OD/ID≦10.

13. optical imaging system as claimed in claim 10, it is characterised in that the minimum thickness of the thing end be OT and The minimum thickness as end is IT, and it meets following condition：0.1≦OT/IT≦10.

14. optical imaging system as claimed in claim 10, it is characterised in that any surface of any lens in said lens Maximum effective radius represented with EHD, using any surface of any lens in said lens and the intersection point of optical axis as starting point, along The profile on the surface is terminal at the maximum effective radius on the surface, and the contour curve length of foregoing point-to-point transmission is ARS, it meets following equation：0.9≦ARS/EHD≦2.0.

15. optical imaging system as claimed in claim 10, it is characterised in that the optical imaging system is in the imaging surface On perpendicular to optical axis there is an image height HOI, the most long operation wavelength of the positive meridian plane light fan of the optical imaging system Represented by entrance pupil edge and the lateral aberration that is incident on the imaging surface at 0.7HOI with PLTA, positive meridian plane light The most short operation wavelength of fan by entrance pupil edge and is incident on the lateral aberration on the imaging surface at 0.7HOI with PSTA Represent, the most long operation wavelength of negative sense meridian plane light fan by entrance pupil edge and is incident on the imaging surface at 0.7HOI Lateral aberration represent that the most short operation wavelength of negative sense meridian plane light fan by entrance pupil edge and is incident on described with NLTA Lateral aberration on imaging surface at 0.7HOI represents that the most long operation wavelength of sagittal surface light fan passes through entrance pupil edge with NSTA And the lateral aberration being incident on the imaging surface at 0.7HOI is represented with SLTA, the most short operation wavelength of sagittal surface light fan passes through The entrance pupil edge and lateral aberration being incident on the imaging surface at 0.7HOI is represented with SSTA, it meets following condition： PLTA≤50 micron；PSTA≤50 micron；NLTA≤50 micron；NSTA≤50 micron；SLTA≤50 micron；And SSTA≤50 Micron.

16. optical imaging system as claimed in claim 10, it is characterised in that first lens and second lens it Between in the distance on optical axis be IN12, and meet following equation：0<IN12/f≦60.

17. optical imaging system as claimed in claim 10, it is characterised in that the 3rd lens and the 4th lens it Between in the distance on optical axis be IN34, the 3rd lens and the 4th lens are respectively TP3 and TP4 in the thickness on optical axis, It meets following condition：1≦(TP4+IN34)/TP3≦10.

18. optical imaging system as claimed in claim 10, it is characterised in that first lens and second lens it Between in the distance on optical axis be IN12, first lens and the second lens are respectively TP1 and TP2 in the thickness on optical axis, It meets following condition：1≦(TP1+IN12)/TP2≦10.

19. optical imaging system as claimed in claim 10, it is characterised in that first lens, second lens, institute It is that light of the wavelength less than 500nm filters out component to state at least one piece of lens in the 3rd lens and the 4th lens.

20. a kind of optical imaging system, it is characterised in that included successively by thing side to image side：

One first lens, there is refracting power；

One second lens, there is refracting power；

One the 3rd lens, there is refracting power；

One the 4th lens, there is refracting power；

One imaging surface；And

One lens positioning component, wherein the lens positioning component is in hollow and can house any of the above-described lens, and make above-mentioned Mirror is arranged on optical axis, and the lens positioning component includes a thing end and one as end, the thing end close to thing side and With one first opening, described to have one second opening close to image side as end, the outer wall of the lens positioning component is included extremely There is at least one shaping to fill mouth trace respectively for few three sections, above-mentioned section, and the optical imaging system has refracting power Lens are four pieces, and the focal length of the optical imaging system is f, and the entrance pupil diameter of the optical imaging system is HEP, described First lens thing side is to the imaging surface in having a distance HOS, the first lens thing side to the described 4th on optical axis For lens image side surface in having a distance InTL on optical axis, the half of the maximum visual angle of the optical imaging system is HAF, with The intersection point of any surface of any lens and optical axis is starting point in said lens, along the profile on the surface until the surface On untill coordinate points at the vertical height of the entrance pupil diameter of optical axis 1/2, the contour curve length of foregoing point-to-point transmission is ARE, it meets following condition：1≦f/HEP≦10；0deg<HAF≤150deg and 0.9≤2 (ARE/HEP)≤2.0.

21. optical imaging system as claimed in claim 20, it is characterised in that the internal diameter of first opening is OD, described The internal diameter of second opening is ID, and it meets following condition：0.1≦OD/ID≦10.

22. optical imaging system as claimed in claim 20, it is characterised in that the minimum thickness of the thing end be OT and The minimum thickness as end is IT, and it meets following condition：1≦OT/IT≦10.

23. optical imaging system as claimed in claim 20, it is characterised in that with the thing side of the 4th lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE41, with the image side surface of the 4th lens in light Intersection point on axle is starting point, along the profile on the surface until hanging down apart from the entrance pupil diameter of optical axis 1/2 on the surface Untill coordinate points at straight height, the contour curve length of foregoing point-to-point transmission is ARE42, and the 4th lens are in the thickness on optical axis TP4, it meets following condition：0.05≦ARE41/TP4≦25；And 0.05≤ARE42/TP4≤25.

24. optical imaging system as claimed in claim 20, it is characterised in that with the thing side of the 3rd lens in optical axis On intersection point be starting point, along the surface profile until on the surface apart from the vertical of the entrance pupil diameter of optical axis 1/2 Highly untill the coordinate points at place, the contour curve length of foregoing point-to-point transmission is ARE31, with the image side surface of the 3rd lens in light Intersection point on axle is starting point, along the profile on the surface until hanging down apart from the entrance pupil diameter of optical axis 1/2 on the surface Untill coordinate points at straight height, the contour curve length of foregoing point-to-point transmission is ARE32, and the 3rd lens are in the thickness on optical axis Spend for TP3, it meets following condition：0.05≦ARE31/TP3≦25；And 0.05≤ARE32/TP3≤25.

25. optical imaging system as claimed in claim 20, it is characterised in that the optical imaging system also includes a light Circle, an imaging sensor and a drive module, described image sensor are arranged at the imaging surface, and the aperture is to institute Stating imaging surface has a distance InS, and the drive module is coupled with each lens and each lens is produced displacement, its Meet following equation：0.2≦InS/HOS≦1.1.