TWM664331U - Optical imaging system - Google Patents

Abstract

An optical imaging system includes a first lens, a second lens, a third lens, a fourth lens, and a fifth lens in order from the object side to the image side. At least one lens from the first lens to the fifth lens has positive refractive power. The fifth lens may have negative refractive power, and both surfaces thereof are aspherical, wherein at least one surface of the fifth lens has an inflection point. The lenses with refractive power in the optical imaging system are the first lens to the fifth lens. When specific conditions are met, it can have greater light collection and better optical path adjustment capabilities to improve imaging quality.

Description

Optical imaging system

This invention relates to an optical imaging system set, and in particular to a miniaturized optical imaging system set applied to electronic products.

In recent years, with the rise of portable electronic products with photography functions, the demand for optical systems has gradually increased. The photosensitive elements of general optical systems are nothing more than charge coupled devices (CCD) or complementary metal-oxide semiconductor sensors (CMOS sensors). With the advancement of semiconductor process technology, the pixel size of photosensitive elements has been reduced, and optical systems have gradually developed towards the field of high pixels, so the requirements for imaging quality are also increasing.

Traditional optical systems installed on portable devices mostly use three- or four-lens structures. However, as the number of pixels in portable devices continues to increase and end consumers demand large apertures, such as low-light and night-time shooting functions, conventional optical imaging systems can no longer meet higher-level photography requirements.

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

The embodiment of this invention is directed to an optical imaging system and an optical image capture lens, which can utilize the refractive power, convex surface and concave surface combination of five lenses (the convex surface or concave surface described in this invention refers to the description of the geometric shape change of the object side or image side of each lens at different heights from the optical axis), thereby effectively increasing the amount of light entering the optical imaging system and improving the imaging quality, so as to be applied to small electronic products.

The terms and codes of the lens parameters related to the present invention are listed below for reference in the subsequent description:

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 object side of the first lens of the optical imaging system and the image side of the fifth lens is represented by InTL; the distance between the fixed light bar (aperture) of the optical imaging system and the infrared light imaging surface is represented by InS; the distance between the first lens and the second lens of the optical imaging system is represented by IN12 (for example); the thickness of the first lens of the optical imaging system on the optical axis is represented by TP1 (for example).

Material-related lens parameters

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

Lens parameters related to viewing angle

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

Lens parameters related to entrance and exit pupils

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

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 arc length of the curve from the intersection 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 surface contour of the lens to the end point of its maximum effective radius, and is represented by ARS. For example, the contour curve length of the maximum effective radius of the object side of the first lens is represented by ARS11, and the contour curve length of the maximum effective radius of the image side of the first lens is represented by ARS12. The contour curve length of the maximum effective radius of the object side of the second lens is represented by ARS21, and the contour curve length of the maximum effective radius of the image side of the second lens is represented by ARS22. The method of expressing the length of the contour curve of the maximum effective radius of any surface of other lenses in the optical imaging system is similar.

The length of the contour curve of 1/2 entrance pupil diameter (HEP) of any surface of a single lens refers to the arc length of the curve from the intersection of the surface of the lens and the optical axis of the optical imaging system to which it belongs, along the surface contour of the lens to the coordinate point on the surface at a vertical height of 1/2 entrance pupil diameter from the optical axis. It is represented by ARE. For example, the length of the contour curve of 1/2 entrance pupil diameter (HEP) of the object side of the first lens is represented by ARE11, and the length of the contour curve of 1/2 entrance pupil diameter (HEP) of the image side of the first lens is represented by ARE12. The length of the contour curve of 1/2 entrance pupil diameter (HEP) on the object side of the second lens is represented by ARE21, and the length of the contour curve of 1/2 entrance pupil diameter (HEP) on the image side of the second lens is represented by ARE22. The length of the contour curve of 1/2 entrance pupil diameter (HEP) on any surface of the remaining lenses in the optical imaging system is represented in the same way.

Parameters related to lens surface depth

The distance between the intersection of the fifth lens object side on the optical axis and the end point of the maximum effective radius of the fifth lens object side is expressed as InRS51 (maximum effective radius depth); the distance between the intersection of the fifth lens image side on the optical axis and the end point of the maximum effective radius of the fifth lens image side is expressed as InRS52 (maximum effective radius depth). The depth (sinking amount) of the maximum effective radius of other lens object side or image side is expressed in the same way as above.

Parameters related to lens 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 with the optical axis. Continuing from the above, for example, the vertical distance between the critical point C41 of the object side of the fourth lens and the optical axis is HVT41 (for example), the vertical distance between the critical point C42 of the image side of the fourth lens and the optical axis is HVT42 (for example), the vertical distance between the critical point C51 of the object side of the fifth lens and the optical axis is HVT51 (for example), and the vertical distance between the critical point C52 of the image side of the fifth lens and the optical axis is HVT52 (for example). The representation of critical points on the object side or image side of other lenses and their vertical distances from the optical axis are similar to the above.

The inflection point on the object side of the fifth lens closest to the optical axis is IF511, and the sinking amount of this point is SGI511 (example). SGI511 is the horizontal displacement distance parallel to the optical axis from the intersection of the object side of the fifth lens on the optical axis to the inflection point of the object side of the fifth lens closest to the optical axis. The vertical distance between this point IF511 and the optical axis is HIF511 (example). The inflection point closest to the optical axis on the fifth lens image side is IF521, and the sinking amount of this point is SGI521 (for example). SGI511 is the horizontal displacement distance parallel to the optical axis from the intersection of the fifth lens image side on the optical axis to the inflection point of the fifth lens image side closest to the optical axis. The vertical distance between this point IF521 and the optical axis is HIF521 (for example).

The second inflection point on the object side of the fifth lens closest to the optical axis is IF512, and the sinking amount of this point is SGI512 (example). SGI512 is the horizontal displacement distance parallel to the optical axis from the intersection of the object side of the fifth lens on the optical axis to the second inflection point on the object side of the fifth lens closest to the optical axis. The vertical distance between this point IF512 and the optical axis is HIF512 (example). The second inflection point on the image side of the fifth lens close to the optical axis is IF522, and the sinking amount of this point is SGI522 (for example). SGI522 is the horizontal displacement distance parallel to the optical axis from the intersection of the image side of the fifth lens on the optical axis to the second inflection point on the image side of the fifth lens close to the optical axis. The vertical distance between this point IF522 and the optical axis is HIF522 (for example).

The third inflection point on the object side of the fifth lens close to the optical axis is IF513, and the sinking amount of this point is SGI513 (example). SGI513 is the horizontal displacement distance parallel to the optical axis from the intersection of the object side of the fifth lens on the optical axis to the third inflection point on the object side of the fifth lens close to the optical axis. The vertical distance between this point IF513 and the optical axis is HIF513 (example). The third inflection point on the fifth lens image side surface close to the optical axis is IF523, and the sinking amount of this point is SGI523 (for example). SGI523 is the horizontal displacement distance parallel to the optical axis from the intersection of the fifth lens image side surface on the optical axis to the third inflection point on the fifth lens image side surface close to the optical axis. The vertical distance between this point IF523 and the optical axis is HIF523 (for example).

The fourth inflection point on the object side of the fifth lens close to the optical axis is IF514, and the sinking amount of this point is SGI514 (example). SGI514 is the horizontal displacement distance parallel to the optical axis from the intersection of the object side of the fifth lens on the optical axis to the fourth inflection point on the object side of the fifth lens close to the optical axis. The vertical distance between this point IF514 and the optical axis is HIF514 (example). The fourth inflection point on the fifth lens image side surface close to the optical axis is IF524, and the sinking amount of this point is SGI524 (for example). SGI524 is the horizontal displacement distance parallel to the optical axis from the intersection of the fifth lens image side surface on the optical axis to the fourth inflection point on the fifth lens image side surface close to the optical axis. The vertical distance between this point IF524 and the optical axis is HIF524 (for example).

The expression of the inflection points on the object side or image side of other lenses and their vertical distances from the optical axis or their sinking amounts are similar to the above.

Variables related to aberrations

The optical distortion of an optical imaging system is represented by ODT; its TV distortion is represented by TDT, and can further define the degree of aberration deviation between 50% and 100% of the imaging field of view; the spherical aberration deviation is represented by DFS; and the coma aberration deviation is represented by DFC.

The lateral aberration at the aperture edge is expressed as STA (STOP Transverse Aberration). To evaluate the performance of a specific optical imaging system, the lateral aberration of light in any field of view can be calculated using the tangential fan or sagittal fan. In particular, the lateral aberration of the longest working wavelength (e.g., 650NM) and the shortest working wavelength (e.g., 470NM) passing through the aperture edge is used as a standard for excellent performance. The coordinate direction of the aforementioned meridional fan can be further divided into positive (upper light) and negative (lower light). The lateral aberration of the longest working wavelength passing through the aperture edge is defined as the distance difference between the imaging position of the longest working wavelength incident on the imaging plane through the aperture edge in a specific field of view and the imaging position of the reference wavelength chief light (e.g., wavelength of 555NM) in the field of view on the imaging plane. The lateral aberration of the shortest working wavelength passing through the aperture edge is defined as the distance difference between the imaging position of the shortest working wavelength incident on the imaging plane through the aperture edge in a specific field of view and the imaging position of the reference wavelength chief light in the field of view on the imaging plane. The distance difference between the two imaging positions of the field of view can be used to evaluate the performance of a specific optical imaging system. The lateral aberration of the shortest and longest working wavelengths incident on the imaging surface at 0.7 field of view (i.e. 0.7 imaging height HOI) through the aperture edge can be less than 100 microns (μm) as a verification method. It can even be further verified that the lateral aberration of the shortest and longest working wavelengths incident on the imaging surface at 0.7 field of view through the aperture edge is less than 80 microns (μm) as a verification method.

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

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

According to the present invention, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an imaging surface in order from the object side to the image side. The focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, and f5 respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the object side of the first lens to the imaging surface has a distance HOS on the optical axis, the object side of the first lens to the image side of the fifth lens has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and any of the lenses Starting from the intersection of any lens surface and the optical axis, follow the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the entrance pupil diameter from the optical axis. The length of the contour curve between the above two points is ARE, which meets the following conditions: 1.98≦f/HEP≦2.02; 41.0488deg<HAF≦43.5878deg and 1.0000≦2(ARE/HEP)≦1.0741.

According to the present invention, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an imaging surface in order from the object side to the image side. The object side surface of the third lens has at least two inflection points, the focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, and f5 respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the object side surface of the first lens to the infrared light imaging surface has a distance HOS on the optical axis, the object side surface of the first lens to the image side surface of the fifth lens has a distance InTL on the optical axis, and half of the maximum viewing angle of the optical imaging system is HAF, starting from the intersection of any surface of any lens and the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 the entrance pupil diameter from the optical axis, the length of the contour curve between the above two points is ARE, which meets the following conditions: 1.99≦f/HEP≦2.01; 41.6684deg<HAF≦42.9531deg and 1.0001≦2(ARE/HEP)≦1.0740.

According to the present invention, an optical imaging system is provided, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens and an imaging surface in order from the object side to the image side. The object side surface of the third lens has at least three inflection points, the focal lengths of the fifth lens are f1, f2, f3, f4, and f5 respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the object side surface of the first lens is at a distance HOS on the optical axis to the infrared imaging surface, the object side surface of the first lens is at a distance InTL on the optical axis to the image side surface of the fifth lens, half of the maximum viewing angle of the optical imaging system is HAF, and the optical imaging system is at a distance HOS on the infrared imaging surface. Perpendicular to the optical axis, it has a maximum imaging height HOI. Starting from the intersection of any surface of any lens in the lenses and the optical axis, it follows the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 of the entrance pupil diameter from the optical axis. The length of the contour curve between the above two points is ARE, which meets the following conditions: 2.00≦f/HEP≦2.01; 42.3183deg<HAF≦42.9531deg and 1.0003≦2(ARE/HEP)≦1.0740.

The length of the profile 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 light rays in each field of view. The longer the profile curve length, the better the ability to correct aberrations. However, it also increases the difficulty in production and manufacturing. Therefore, the length of the profile curve of any surface of a single lens within the maximum effective radius must be controlled, especially the ratio (ARS/TP) between the length of the profile curve within the maximum effective radius of the surface and the thickness (TP) of the lens to which the surface belongs on the optical axis. For example, the length of the contour curve of the maximum effective radius of the object side of the first lens is represented by ARS11, the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ARS11/TP1. The length of the contour curve of the maximum effective radius of the image side of the first lens is represented by ARS12, and the ratio between it and TP1 is ARS12/TP1. The length of the contour curve of the maximum effective radius of the 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 them is ARS21/TP2. The length of the contour curve of the maximum effective radius of the image side of the second lens is represented by ARS22, and the ratio between it and TP2 is ARS22/TP2. The proportional relationship between the length of the contour curve of the maximum effective radius of any surface of the remaining lenses in the optical imaging system and the thickness (TP) of the lens to which the surface belongs on the optical axis, and the expression method is similar.

The length of the profile curve of any surface of a single lens within the height range of 1/2 entrance pupil diameter (HEP) particularly affects the ability of the surface to correct aberrations in the common area of each light field and the optical path difference between the light of each field. The longer the profile curve length, the better the ability to correct aberrations. However, it also increases the difficulty in production and manufacturing. Therefore, the length of the profile curve of any surface of a single lens within the height range of 1/2 entrance pupil diameter (HEP) must be controlled, especially the proportional relationship (ARE/TP) between the length of the profile curve within the height range of 1/2 entrance pupil diameter (HEP) of the surface and the thickness (TP) of the lens to which the surface belongs on the optical axis. For example, the length of the contour curve of the object side of the first lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ARE11, the thickness of the first lens on the optical axis is TP1, and the ratio between the two is ARE11/TP1. The length of the contour curve of the image side of the first lens at 1/2 of the entrance pupil diameter (HEP) height is represented by ARE12, and the ratio between it and TP1 is ARE12/TP1. The length of the profile curve at 1/2 entrance pupil diameter (HEP) height of the object side of the second lens is represented by ARE21, and the thickness of the second lens on the optical axis is TP2. The ratio between the two is ARE21/TP2. The length of the profile curve at 1/2 entrance pupil diameter (HEP) height of the image side of the second lens is represented by ARE22, and the ratio between it and TP2 is ARE22/TP2. The proportional relationship between the length of the profile curve at 1/2 entrance pupil diameter (HEP) height of any surface of the remaining lenses in the optical imaging system and the thickness (TP) of the lens to which the surface belongs on the optical axis is expressed in the same way.

When |f1|>f5, the total height of the optical imaging system (HOS; Height of Optic System) can be appropriately shortened to achieve the purpose of miniaturization.

When |f2|+|f3|+|f4| and |f1|+|f5| meet the above conditions, at least one of the second to fourth lenses has a weak positive refractive power or a weak negative refractive power. The so-called weak refractive power means that the absolute value of the focal length of the specific lens is greater than 10. When at least one of the second to fourth lenses 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 too early. On the contrary, if at least one of the second to fourth lenses has a weak negative refractive power, the aberration of the correction system can be fine-tuned.

In addition, the fifth lens may have negative refractive power, and its image side surface may be concave. This is beneficial for shortening the rear focal length to maintain miniaturization. In addition, at least one surface of the fifth lens may have at least one inflection point, which can effectively suppress the angle of incidence of off-axis field of view light, and further correct the aberration of the off-axis field of view.

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

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

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

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

114, 214, 314, 414, 514, 614: like the side

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

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

124, 224, 324, 424, 524, 624: like the side

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

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

134, 234, 334, 434, 534, 634: like the side

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

142, 242, 342, 442, 542, 642: side of the object

144, 244, 344, 444, 544, 644: like the side

150, 250, 350, 450, 550, 650: Fifth lens

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

154, 254, 354, 454, 554, 654: like the side

180, 280, 380, 480, 580, 680: Infrared filter

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

192, 292, 392, 492, 592, 692: Image sensor components

f: Focal length of the optical imaging system

f1: Focal length of the first lens

f2: Focal length of the second lens

f3: focal length of the third lens

f4: Focal length of the fourth lens

f5: Focal length of the fifth lens

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

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

NA1: dispersion coefficient of the first lens

NA3: dispersion coefficient of the third lens

NA5: dispersion coefficient of the fifth lens

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

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

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

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

R9, R10: Radius of curvature of the object side and image side of the fifth lens

TP1: Thickness of the first lens on the optical axis

TP2, TP3, TP4, TP5: The thickness of the second to fifth lenses on the optical axis

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

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

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

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

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

InRS51: Horizontal displacement distance from the intersection of the fifth lens object side on the optical axis to the maximum effective radius position of the fifth lens object side on the optical axis

IF511: The inflection point on the object side of the fifth lens closest to the optical axis

SGI511: The amount of subsidence at this point

HIF511: The vertical distance between the inflection point closest to the optical axis on the object side of the fifth lens and the optical axis

IF521: The inflection point on the image side of the fifth lens closest to the optical axis

SGI521: The amount of subsidence at this point

HIF521: The vertical distance between the inflection point closest to the optical axis on the image side of the fifth lens and the optical axis

IF512: The second inflection point closest to the optical axis on the object side of the fifth lens

SGI512: The amount of subsidence at this point

HIF512: The vertical distance between the second inflection point closest to the optical axis on the object side of the fifth lens and the optical axis

IF522: The second inflection point closest to the optical axis on the image side of the fifth lens

SGI522: The amount of subsidence at this point

HIF522: The vertical distance between the second inflection point on the image side of the fifth lens closest to the optical axis and the optical axis

C51: Critical point of the fifth lens object side

C52: Critical point on the image side of the fifth lens

SGC51: Horizontal displacement distance between the critical point on the object side of the fifth lens and the optical axis

SGC52: Horizontal displacement distance between the critical point on the image side of the fifth lens and the optical axis

HVT51: The vertical distance between the critical point on the object side of the fifth lens and the optical axis

HVT52: The vertical distance between the critical point on the image side of the fifth lens and the optical axis

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

InS: distance from aperture to infrared imaging surface

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

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

TDT: TV distortion of optical imaging system during imaging (TV Distortion)

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

The above and other features of this creation will be explained in detail by referring to the attached pictures.

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

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

The optical imaging system can be designed using three infrared working wavelengths, namely 850nm, 940nm, and 960nm, of which 960nm is the main reference wavelength for extracting technical characteristics.

The ratio of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power is PPR, the ratio of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power is NPR, the sum of the PPR of all lenses with positive refractive power is ΣPPR, the sum of the NPR of all lenses with negative refractive power is ΣNPR, when the following conditions are met, it helps to control the total refractive power and total length of the optical imaging system: 0.5≦ΣPPR/｜ΣNPR｜≦3.0, preferably, the following conditions can be met: 1≦ΣPPR/｜ΣNPR｜≦2.5.

The optical imaging system may further include an image sensor element, which is disposed on the infrared imaging surface. Half of the diagonal length of the effective sensing area of the image sensor element (i.e., the imaging height or maximum image height of the optical imaging system) is HOI, and the distance from the object side of the first lens to the infrared imaging surface on the optical axis is HOS, which satisfies the following conditions: HOS/HOI≦25; and 0.5≦HOS/f≦25. Preferably, the following conditions can be met: 1≦HOS/HOI≦20; and 1≦HOS/f≦20. 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 this invention, at least one aperture can be set as needed to reduce stray light, which helps to improve image quality.

In the optical imaging system of this invention, the aperture configuration can be a front aperture or a center aperture, wherein the front aperture means that the aperture is set between the object and the first lens, and the center aperture means that the aperture is set between the first lens and the infrared imaging plane. If the aperture is a front aperture, the exit pupil of the optical imaging system and the infrared imaging plane can be longer to accommodate more optical elements and increase the efficiency of the image sensor element in receiving the image; if it is a center aperture, it helps to expand the field of view of the system, so that the optical imaging system has the advantage of a wide-angle lens. The distance between the aperture and the infrared imaging plane is InS, which meets the following conditions: 0.2≦InS/HOS≦1.1. In this way, the miniaturization of the optical imaging system and the wide-angle characteristics can be maintained at the same time.

In the optical imaging system of this invention, the distance between the object side of the first lens and the image side of the fifth lens is InTL, and the sum of the thicknesses of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: 0.1≦ΣTP/InTL≦0.9. In this way, the contrast of the system imaging and the yield of lens manufacturing can be taken into account at the same time, and an appropriate back focal length can be provided to accommodate other components.

The radius of curvature of the object side of the first lens is R1, and the radius of curvature of the image side of the first lens is R2, which meets the following conditions: 0.01<｜R1/R2｜<100. In this way, the first lens has an appropriate positive refractive power to avoid excessive increase in spherical aberration. Preferably, the following conditions can be met: 0.05<｜R1/R2｜<80.

The curvature radius of the object side of the fifth lens is R9, and the curvature radius of the image side of the fifth lens is R10, which meets the following conditions: -50<(R9-R10)/(R9+R10)<50. This is helpful 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 meets the following conditions: IN12/f≦5.0. This helps to improve the chromatic aberration of the lens and enhance its performance.

The distance between the fourth lens and the fifth lens on the optical axis is IN45, which meets the following conditions: IN45/f≦5.0. This helps to improve the chromatic aberration of the lens and enhance its performance.

The thickness of the first lens and the second lens on the optical axis are TP1 and TP2 respectively, which meet the following conditions: 0.1≦(TP1+IN12)/TP2≦50.0. This helps control the sensitivity of the optical imaging system and improve its performance.

The thickness of the fourth lens and the fifth lens on the optical axis are TP4 and TP5 respectively, and the spacing between the two lenses on the optical axis is IN45, which meets the following conditions: 0.1≦(TP5+IN45)/TP4≦50.0. This helps control the sensitivity of the optical imaging system and reduce the overall height of the system.

The thickness of the second lens, the third lens and the fourth lens on the optical axis are TP2, TP3 and TP4 respectively, the spacing distance between the second lens and the third lens on the optical axis is IN23, the spacing distance between the third lens and the fourth lens on the optical axis is IN34, and the distance between the object side of the first lens and the image side of the fifth lens is InTL, which meets the following conditions: 0.1≦TP3/(IN23+TP3+IN34)<1. This helps to slightly correct the aberration generated by the incident light traveling layer by layer and reduce the total height of the system.

In the optical imaging system of this invention, the vertical distance between the critical point C51 of the fifth lens object side and the optical axis is HVT51, the vertical distance between the critical point C52 of the fifth lens image side and the optical axis is HVT52, the horizontal displacement distance from the intersection of the fifth lens object side on the optical axis to the critical point C51 on the optical axis is SGC51, and the horizontal displacement distance from the intersection of the fifth lens image side on the optical axis to the critical point C52 The horizontal displacement distance on the optical axis is SGC52, which meets the following conditions: 0mm≦HVT51≦3mm; 0mm<HVT52≦6mm; 0≦HVT51/HVT52; 0mm≦｜SGC51｜≦0.5mm; 0mm<｜SGC52｜≦2mm; and 0<｜SGC52｜/(｜SGC52｜+TP5)≦0.9. This can effectively correct the aberration of the off-axis field of view.

The optical imaging system of this invention meets the following conditions: 0.2≦HVT52/HOI≦0.9. Preferably, the following conditions can be met: 0.3≦HVT52/HOI≦0.8. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

The optical imaging system of this invention meets the following conditions: 0≦HVT52/HOS≦0.5. Preferably, it can meet the following conditions: 0.2≦HVT52/HOS≦0.45. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of the present invention, the horizontal displacement distance parallel to the optical axis between the intersection point of the object side of the fifth lens on the optical axis and the inflection point of the optical axis closest to the object side of the fifth lens is represented by SGI511, and the horizontal displacement distance parallel to the optical axis between the intersection point of the image side of the fifth lens on the optical axis and the inflection point of the optical axis closest to the image side of the fifth lens is represented by SGI521, which meets the following conditions: 0<SGI511/(SGI511+TP5)≦0.9; 0<SGI521/(SGI521+TP5)≦0.9. Preferably, the following conditions can be met: 0.1≦SGI511/(SGI511+TP5)≦0.6; 0.1≦SGI521/(SGI521+TP5)≦0.6.

The horizontal displacement distance between the intersection of the object side of the fifth lens on the optical axis and the inflection point of the object side of the fifth lens second closest to the optical axis and parallel to the optical axis is represented by SGI512, and the horizontal displacement distance between the intersection of the image side of the fifth lens on the optical axis and the inflection point of the image side of the fifth lens second closest to the optical axis and parallel to the optical axis is represented by SGI522, which meets the following conditions: 0<SGI512/(SGI512+TP5)≦0.9; 0<SGI522/(SGI522+TP5)≦0.9. Preferably, the following conditions can be met: 0.1≦SGI512/(SGI512+TP5)≦0.6; 0.1≦SGI522/(SGI522+TP5)≦0.6.

The vertical distance between the inflection point of the fifth lens object side closest to the optical axis and the optical axis is represented by HIF511, and the vertical distance between the intersection of the fifth lens image side on the optical axis and the inflection point of the fifth lens image side closest to the optical axis and the optical axis is represented by HIF521, which meets the following conditions: 0.001mm≦｜HIF511｜≦5mm; 0.001mm≦｜HIF521｜≦5mm. Preferably, the following conditions can be met: 0.1mm≦｜HIF511｜≦3.5mm; 1.5mm≦｜HIF521｜≦3.5mm.

The vertical distance between the second inflection point of the object side of the fifth lens close to the optical axis and the optical axis is represented by HIF512, and the vertical distance between the intersection of the image side of the fifth lens on the optical axis and the second inflection point of the image side of the fifth lens close to the optical axis and the optical axis is represented by HIF522, which meets the following conditions: 0.001mm≦｜HIF512｜≦5mm; 0.001mm≦｜HIF522｜≦5mm. Preferably, the following conditions can be met: 0.1mm≦｜HIF522｜≦3.5mm; 0.1mm≦｜HIF512｜≦3.5mm.

The vertical distance between the third inflection point of the fifth lens object side surface close to the optical axis and the optical axis is represented by HIF513, and the vertical distance between the intersection of the fifth lens image side surface on the optical axis and the third inflection point of the fifth lens image side surface close to the optical axis and the optical axis is represented by HIF523, which meets the following conditions: 0.001mm≦｜HIF513｜≦5mm; 0.001mm≦｜HIF523｜≦5mm. Preferably, the following conditions can be met: 0.1mm≦｜HIF523｜≦3.5mm; 0.1mm≦｜HIF513｜≦3.5mm.

The vertical distance between the fourth inflection point of the fifth lens object side surface close to the optical axis and the optical axis is represented by HIF514, and the vertical distance between the intersection of the fifth lens image side surface on the optical axis and the fourth inflection point of the fifth lens image side surface close to the optical axis and the optical axis is represented by HIF524, which meets the following conditions: 0.001mm≦｜HIF514｜≦5mm; 0.001mm≦｜HIF524｜≦5mm. Preferably, the following conditions can be met: 0.1mm≦｜HIF524｜≦3.5mm; 0.1mm≦｜HIF514｜≦3.5mm.

An implementation method of the optical imaging system of this invention can help correct the chromatic aberration of the optical imaging system by 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 a height of h along the optical axis with 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 this invention, the material of the lens can be plastic or glass. When the lens material is plastic, the production cost and weight can be effectively reduced. When the lens material 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 surfaces of the first to fifth lenses in the optical imaging system can be aspherical, which can obtain more control variables. In addition to eliminating aberrations, it can even reduce the number of lenses used compared to the use of traditional glass lenses, thereby effectively reducing the overall height of the optical imaging system of this invention.

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

The optical imaging system of this invention can be applied to the optical system of mobile focus according to the needs, and has the characteristics of excellent aberration correction and good imaging quality, thereby expanding the application scope.

The optical imaging system of the invention may further include a driving module, which can be coupled with the lenses and cause the lenses to move. The driving module may be a voice coil motor (VCM) for driving the lens for focusing, or an optical image stabilization element (OIS) for reducing the frequency of defocusing caused by lens vibration during shooting.

The optical imaging system of this invention can further make at least one of the first lens, the second lens, the third lens, the fourth lens and the fifth lens a light filtering element with a wavelength less than 500nm according to the needs. This can be achieved by coating at least one surface of the lens with a specific filtering function or the lens itself is made of a material that can filter short wavelengths.

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

Based on the above implementation method, a specific implementation example is proposed below and described in detail with accompanying drawings.

First embodiment

Please refer to Figure 1A and Figure 1B, wherein Figure 1A is a schematic diagram of an optical imaging system according to the first embodiment of the present invention, and Figure 1B is a graph of spherical aberration, astigmatism and optical distortion of the optical imaging system of the first embodiment from left to right. Figure 1C is a graph of the lateral aberration of the meridional plane light fan and sagittal plane light fan, the longest working wavelength and the shortest working wavelength through the aperture edge at 0.7 field of view of the optical imaging system of the first embodiment. As can be seen from FIG. 1A, the optical imaging system includes, from the object side to the image side, a first lens 110, an aperture 100, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, an infrared filter 180, an infrared imaging surface 190, and an image sensing element 192.

The first lens 110 has positive refractive power and is made of plastic. Its object side surface 112 is convex, and its image side surface 114 is concave. Both are aspherical, and its object side surface 112 has an anti-inflection point. The contour curve length of the maximum effective radius of the object side surface of the first lens is represented by ARS11, and the contour curve length of the maximum effective radius of the image side surface of the first lens is represented by ARS12. The contour curve length of 1/2 of the entrance pupil diameter (HEP) of the object side surface of the first lens is represented by ARE11, and the contour curve length of 1/2 of the entrance pupil diameter (HEP) of the image side surface 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 from the intersection of the object side of the first lens on the optical axis to the inflection point of the optical axis closest to the object side of the first lens is represented by SGI111, and the horizontal displacement distance parallel to the optical axis from the inflection point of the optical axis closest to the image side of the first lens is represented by SGI121, which meets the following conditions: SGI111=0.122787mm; |SGI111|/(|SGI111|+TP1)=0.3007.

The vertical distance between the inflection point of the optical axis closest to the optical axis on the object side of the first lens and the optical axis is represented by HIF111, and the vertical distance between the inflection point of the optical axis closest to the optical axis on the image side of the first lens and the optical axis is represented by HIF121, which meets the following conditions: HIF111=0.429949mm; HIF111/HOI=0.2781.

The second lens 120 has negative refractive power and is made of plastic. Its object side surface 122 is concave, and its image side surface 124 is concave, and both are aspherical. The contour curve length of the maximum effective radius of the object side surface of the second lens is represented by ARS21, and the contour curve length of the maximum effective radius of the image side surface of the second lens is represented by ARS22. The contour curve length of 1/2 of the incident pupil diameter (HEP) of the object side surface of the second lens is represented by ARE21, and the contour curve length of 1/2 of the incident pupil diameter (HEP) of the image side surface 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 from the intersection of the object side of the second lens on the optical axis to the inflection point of the optical axis closest to the object side of the second lens is represented by SGI211, and the horizontal displacement distance parallel to the optical axis from the inflection point of the optical axis closest to the image side of the second lens is represented by SGI221.

The vertical distance between the inflection point of the object side of the second lens and the optical axis is represented by HIF211, and the vertical distance between the inflection point of the image side of the second lens and the optical axis is represented by HIF221.

The third lens 130 has positive refractive power and is made of plastic. Its object side surface 132 is convex, and its image side surface 134 is concave. Both are aspherical, and its object side surface 132 has an anti-inflection point. The contour curve length of the maximum effective radius of the object side surface of the third lens is represented by ARS31, and the contour curve length of the maximum effective radius of the image side surface of the third lens is represented by ARS32. The contour curve length of 1/2 of the incident pupil diameter (HEP) of the object side surface of the third lens is represented by ARE31, and the contour curve length of 1/2 of the incident pupil diameter (HEP) of the image side surface 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 from the intersection of the object side of the third lens on the optical axis to the inflection point of the third lens object side closest to the optical axis is represented by SGI311, and the horizontal displacement distance parallel to the optical axis from the intersection of the image side of the third lens on the optical axis to the inflection point of the third lens image side closest to the optical axis is represented by SGI321, which meets the following conditions: SGI311=0.00444525mm; |SGI311|/(|SGI311|+TP3)=0.0265.

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

The vertical distance between the inflection point of the third lens on the object side closest to the optical axis and the optical axis is expressed as HIF311, and the vertical distance between the inflection point of the third lens on the image side closest to the optical axis and the optical axis is expressed as HIF321, which meets the following conditions: HIF311=0.153256mm; HIF311/HOI=0.0991.

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

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

The horizontal displacement distance parallel to the optical axis from the intersection of the fourth lens object side on the optical axis to the inflection point of the fourth lens object side closest to the optical axis is represented by SGI411, and the horizontal displacement distance parallel to the optical axis from the intersection of the fourth lens image side on the optical axis to the inflection point of the fourth lens image side closest to the optical axis is represented by SGI421, which meets the following conditions: SGI421=-0.148037mm; |SGI421|/(|SGI421|+TP4)=0.3050.

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

The vertical distance between the inflection point of the fourth lens on the object side closest to the optical axis and the optical axis is represented by HIF411, and the vertical distance between the inflection point of the fourth lens on the image side closest to the optical axis and the optical axis is represented by HIF421, which meets the following conditions: HIF421=0.406777mm; HIF421/HOI=0.2631.

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

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

The horizontal displacement distance parallel to the optical axis from the intersection of the fifth lens object side on the optical axis to the inflection point of the fifth lens object side closest to the optical axis is represented by SGI511, and the horizontal displacement distance parallel to the optical axis from the intersection of the fifth lens image side on the optical axis to the inflection point of the fifth lens image side closest to the optical axis is represented by SGI521, which meets the following conditions: SGI511=-0.00061251mm; |SGI511|/(|SGI511|+TP5)=0.0034; SGI521=0.0453086mm; |SGI521|/(|SGI521|+TP5)=0.2011.

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

The vertical distance between the inflection point of the fifth lens on the object side closest to the optical axis and the optical axis is represented by HIF511, and the vertical distance between the inflection point of the fifth lens on the image side closest to the optical axis and the optical axis is represented by HIF521, which meets the following conditions: HIF511=0.0726mm; HIF511/HOI=0.0470; HIF521=0.2263mm; HIF521/HOI=0.1464.

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

The infrared filter 180 is made of glass and is disposed between the fifth lens 150 and the infrared imaging surface 190 and does not affect the focal length of the optical imaging system.

In the optical imaging system of this embodiment, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, and half of the maximum viewing angle in the optical imaging system is HAF, and the values are as follows: f=1.6438mm; f/HEP=2.0; and HAF=42.3183 degrees and tan(HAF)=0.9105.

In the optical imaging system of this embodiment, the focal length of the first lens 110 is f1, and the focal length of the fifth lens 150 is f5, which meets the following conditions: f1=1.70978mm; |f/f1|=0.9614; f5=-0.700747; and |f1|>f5.

In the optical imaging system of this embodiment, the focal lengths of the second lens 120 to the fifth lens 150 are f2, f3, f4, and f5, respectively, which satisfy the following conditions: |f2|+|f3|+|f4|=24.9837mm; |f1|+|f5|=2.410547mm and |f2|+|f3|+|f4|>|f1|+|f5|.

The ratio PPR of the focal length f of the optical imaging system to the focal length fp of each lens with positive refractive power, and the ratio NPR of the focal length f of the optical imaging system to the focal length fn of each lens with negative refractive power. In the optical imaging system of this embodiment, the sum of the PPRs of all lenses with positive refractive power is ΣPPR=f/f1+f/f3+f/f4=3.27707, and the sum of the NPRs of all lenses with negative refractive power is ΣNPR=f/f2+f/f5=-2.73192, ΣPPR/｜ΣNPR｜=1.14125. At the same time, the following conditions are also met: |f/f2|=0.38598; |f/f3|=0.08224; |f/f4|=2.23343; |f/f5|=2.34594.

In the optical imaging system of this embodiment, the distance between the first lens object side 112 and the fifth lens image side 154 is InTL, the distance between the first lens object side 112 and the infrared imaging surface 190 is HOS, the distance between the aperture 100 and the infrared imaging surface 180 is InS, half of the diagonal length of the effective sensing area of the image sensing element 192 is HOI, and the fifth lens image side The distance between the surface 154 and the infrared imaging surface 190 is BFL, which satisfies the following conditions: InTL+BFL=HOS; HOS=2.1401mm; HOI=1.5460mm; HOS/HOI=1.3843; HOS/f=1.30192; InS=1.8211mm; and InS/HOS=0.8509.

In the optical imaging system of this embodiment, the sum of the thicknesses of all lenses with refractive power on the optical axis is ΣTP, which satisfies the following conditions: ΣTP=1.1160mm; InTL=1.4779mm and ΣTP/InTL=0.7551. In this way, the contrast of the system imaging and the yield of the lens manufacturing can be taken into consideration at the same time, and an appropriate back focal length can be provided to accommodate other components.

In the optical imaging system of this embodiment, the radius of curvature of the object side surface 112 of the first lens is R1, and the radius of curvature of the image side surface 114 of the first lens is R2, which meets the following condition: |R1/R2|=0.15089. Thus, the first lens has an appropriate positive refractive power strength to avoid excessive increase in spherical aberration.

In the optical imaging system of this embodiment, the radius of curvature of the object side surface 152 of the fifth lens is R9, and the radius of curvature of the image side surface 154 of the fifth lens is R10, which meets the following condition: (R9- R10)/(R9+R10)=1.2877. This is helpful to correct the astigmatism generated by the optical imaging system.

In the optical imaging system of this embodiment, the sum of the focal lengths of all lenses with positive refractive power is ΣPP, which satisfies the following conditions: ΣPP=f1+f3+f4=22.4347mm; and f1/(f1+f3+f4)=0.07621. This helps to properly distribute the positive refractive power of the first lens 110 to other positive lenses to suppress the generation of significant aberrations in the process of incident light traveling.

In the optical imaging system of this embodiment, the sum of the focal lengths of all lenses with negative refractive power is ΣNP, which satisfies the following conditions: ΣNP=f2+f5=-4.9595mm; and f5/(f2+f5)=0.14128. This helps to properly distribute the negative refractive power of the fifth lens to other negative lenses to suppress the generation of significant aberrations in the process of incident light traveling.

In the optical imaging system of this embodiment, the spacing distance between the first lens 110 and the second lens 120 on the optical axis is IN12, which meets the following conditions: IN12 = 0.0950mm; IN12/f = 0.0578. This helps to improve the chromatic aberration of the lens to enhance its performance.

In the optical imaging system of this embodiment, the spacing distance between the fourth lens 140 and the fifth lens 150 on the optical axis is IN45, which meets the following conditions: IN45 = 0.0549 mm; IN45/f = 0.0334. This helps to improve the chromatic aberration of the lens to enhance its performance.

In the optical imaging system of this embodiment, the thicknesses of the first lens 110, the second lens 120 and the third lens 130 on the optical axis are TP1, TP2 and TP3 respectively, which meet the following conditions: TP1=0.2855mm; TP2=0.1500mm; TP3=0.1631mm; and (TP1+IN12)/TP2=2.5367. This helps to control the sensitivity of the optical imaging system and improve its performance.

In the optical imaging system of this embodiment, the thicknesses of the fourth lens 140 and the fifth lens 150 on the optical axis are TP4 and TP5 respectively, and the spacing distance between the two lenses on the optical axis is IN45, which satisfies the following conditions: TP4=0.3373mm; TP5=0.1800mm; and (TP5+IN45) /TP4=0.69641. This helps to control the sensitivity of the optical imaging system manufacturing and reduce the overall height of the system.

In the optical imaging system of this embodiment, the spacing distance between the third lens 130 and the fourth lens 140 on the optical axis is IN34, and the distance between the object side surface 112 of the first lens and the image side surface 164 of the fifth lens is InTL, which meets the following conditions: TP2/TP3=0.9196; TP3/TP4=0.4835; TP4/TP5=1.8741; and TP3/(IN23+TP3+IN34)=0.43493. This helps to slightly correct the aberration generated by the incident light during its travel layer by layer and reduce the overall height of the system.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection of the fourth lens object side surface 142 on the optical axis to the maximum effective radius position of the fourth lens object side surface 142 on the optical axis is InRS41, the horizontal displacement distance from the intersection of the fourth lens image side surface 144 on the optical axis to the maximum effective radius position of the fifth lens image side surface 144 on the optical axis is InRS42, and the thickness of the fourth lens 140 on the optical axis is TP4, which meets the following conditions: InRS41=-0.0802mm; InRS42=-0.2645mm; |InRS41|/TP4=0.2378 and |InRS42|/TP4=0.7842. This is beneficial to the manufacture and molding of the lens and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the fourth lens object side surface 142 and the optical axis is HVT41, and the vertical distance between the critical point of the fourth lens image side surface 144 and the optical axis is HVT42, which meets the following conditions: HVT41=0; HVT42=0.

In the optical imaging system of this embodiment, the horizontal displacement distance from the intersection of the fifth lens object side surface 152 on the optical axis to the maximum effective radius position of the fifth lens object side surface 152 on the optical axis is InRS51, the horizontal displacement distance from the intersection of the fifth lens image side surface 154 on the optical axis to the maximum effective radius position of the fifth lens image side surface 154 on the optical axis is InRS52, and the thickness of the fifth lens 150 on the optical axis is TP5, which meets the following conditions: InRS51=-0.2568mm; InRS52=-0.1965 mm; |InRS51|/TP5=1.4267 and |InRS52|/TP5=1.0917. This is beneficial to the manufacture and molding of the lens and effectively maintains its miniaturization.

In the optical imaging system of this embodiment, the vertical distance between the critical point of the fifth lens object side surface 162 and the optical axis is HVT51, and the vertical distance between the critical point of the fifth lens image side surface 154 and the optical axis is HVT52, which meets the following conditions: HVT51=0; HVT52=0.5669mm; and HVT51/HVT52=0.

In the optical imaging system of this embodiment, the following condition is met: HVT52/HOI=0.3667. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, the following condition is met: HVT52/HOS=0.2649. This helps to correct the aberration of the peripheral field of view of the optical imaging system.

In the optical imaging system of this embodiment, the third lens and the fifth lens have negative refractive power, the dispersion coefficient of the third lens is NA3, and the dispersion coefficient of the fifth lens is NA5, which meets the following condition: NA5/NA3=1. This helps to correct the chromatic aberration of the optical imaging system.

In the optical imaging system of this embodiment, the TV distortion of the optical imaging system during imaging is TDT, and the optical distortion during imaging is ODT, which meets the following conditions: |TDT|=1.20869%; |ODT|=2.58355%.

In the optical imaging system of this embodiment, the longest working wavelength of the positive meridian light fan diagram is incident on the infrared light imaging surface through the aperture edge. The lateral aberration of 0.7 fields of view is represented by PLTA, which is 0.474μm. The shortest working wavelength of the positive meridian light fan diagram is incident on the infrared light imaging surface through the aperture edge. The lateral aberration of 0.7 fields of view is represented by PSTA, which is 2.3548 2μm, the longest working wavelength of the negative meridian light fan diagram is incident on the infrared light imaging surface through the aperture edge, and the lateral aberration of 0.7 fields of view is expressed as NLTA, which is -7.40469μm, and the shortest working wavelength of the negative meridian light fan diagram is incident on the infrared light imaging surface through the aperture edge, and the lateral aberration of 0.7 fields of view is expressed as NSTA, which is -6.05666μm. The longest working wavelength of the sagittal plane light fan diagram is incident on the infrared light imaging surface through the aperture edge. The lateral aberration of 0.7 fields of view is expressed as SLTA, which is 2.84967μm. The shortest working wavelength of the sagittal plane light fan diagram is incident on the infrared light imaging surface through the aperture edge. The lateral aberration of 0.7 fields of view is expressed as SSTA, which is 4.57448μm.

Please refer to Table 1 and Table 2 below.

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

Table 1 is the detailed structural data of the first embodiment of Figure 1A, where the units of curvature radius, thickness, distance and focal length are mm, and surfaces 0-15 represent the surfaces from the object side to the image side in sequence. Table 2 is the aspheric surface data in the first embodiment, where k represents the cone coefficient in the aspheric curve equation, and A1-A30 represents the 1st-30th order aspheric surface coefficients of each surface. In addition, the following tables of the embodiments correspond to the schematic diagrams and aberration curve diagrams of each embodiment. The definitions of the data in the tables are the same as those in Tables 1 and 2 of the first embodiment, and are not elaborated here.

Second embodiment

Please refer to Figure 2A and Figure 2B, wherein Figure 2A shows a schematic diagram of an optical imaging system according to the second embodiment of the present invention, and Figure 2B shows the spherical aberration, astigmatism and optical distortion curves of the optical imaging system of the second embodiment from left to right. Figure 2C shows the lateral aberration diagram of the optical imaging system of the second embodiment at a field of view of 0.7. As can be seen from Figure 2A, the optical imaging system includes a first lens 210, an aperture 200, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, an infrared filter 280, an infrared imaging surface 290 and an image sensing element 292 in order from the object side to the image side.

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

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

The third lens 230 has positive refractive power and is made of plastic. Its object side surface 232 is convex, and its image side surface 234 is concave. Both are aspherical surfaces, and both the object side surface 232 and the image side surface 234 have two inflection points.

The fourth lens 240 has positive refractive power and is made of plastic. Its object side surface 242 is concave, and its image side surface 244 is convex. Both are aspherical surfaces. The object side surface 242 has one inflection point and the image side surface 244 has two inflection points.

The fifth lens 250 has negative refractive power and is made of plastic. Its object side surface 252 is convex, and its image side surface 254 is concave. Both are aspherical, and both the object side surface 252 and the image side surface 254 have two inflection points. This helps shorten the rear focal length to maintain miniaturization. In addition, the angle of incidence of off-axis field of view light can be effectively suppressed, and the aberration of the off-axis field of view can be further corrected.

The infrared filter 280 is made of glass and is disposed between the fifth lens 250 and the infrared imaging surface 290 and does not affect the focal length of the optical imaging system.

Please refer to Table 3 and Table 4 below.

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

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:

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

Third embodiment

Please refer to Figure 3A and Figure 3B, wherein Figure 3A shows a schematic diagram of an optical imaging system according to the third embodiment of the present invention, and Figure 3B shows the spherical aberration, astigmatism and optical distortion curves of the optical imaging system of the third embodiment from left to right. Figure 3C shows the lateral aberration diagram of the optical imaging system of the third embodiment at a field of view of 0.7. As can be seen from Figure 3A, the optical imaging system includes a first lens 310, an aperture 300, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, an infrared filter 380, an infrared imaging surface 390 and an image sensing element 392 from the object side to the image side.

The first lens 310 has positive refractive power and is made of plastic. Its object side surface 312 is convex, and its image side surface 314 is concave. Both are aspherical surfaces, and both the object side surface 312 and the image side surface 314 have an inflection point.

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

The third lens 330 has positive refractive power and is made of plastic. Its object side surface 332 is convex, and its image side surface 334 is concave. Both are aspherical surfaces, and both the object side surface 332 and the image side surface 334 have two inflection points.

The fourth lens 340 has positive refractive power and is made of plastic. Its object side surface 342 is concave, and its image side surface 344 is convex. Both are aspherical surfaces. The object side surface 342 has one inflection point and the image side surface 344 has two inflection points.

The fifth lens 350 has negative refractive power and is made of plastic. Its object side surface 352 is concave, and its image side surface 354 is concave. Both are aspherical, and both the object side surface 352 and the image side surface 354 have two inflection points. This helps shorten the rear focal length to maintain miniaturization.

The infrared filter 380 is made of glass and is disposed between the fifth lens 350 and the infrared imaging surface 390 and does not affect the focal length of the optical imaging system.

Please refer to Table 5 and Table 6 below.

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

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

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

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

Fourth embodiment

Please refer to Figure 4A and Figure 4B, wherein Figure 4A shows a schematic diagram of an optical imaging system according to the fourth embodiment of the present invention, and Figure 4B shows the spherical aberration, astigmatism and optical distortion curves of the optical imaging system of the fourth embodiment from left to right. Figure 4C shows the lateral aberration diagram of the optical imaging system of the fourth embodiment at 0.7 field of view. As can be seen from Figure 4A, the optical imaging system includes a first lens 410, an aperture 400, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, an infrared filter 480, an infrared imaging surface 490 and an image sensing element 492 in order from the object side to the image side.

The first lens 410 has positive refractive power and is made of plastic. Its object side surface 412 is convex, and its image side surface 414 is concave. Both are aspherical, and its image side surface 414 has an inflection point.

The second lens 420 has negative refractive power and is made of plastic. Its object side surface 422 is concave, and its image side surface 424 is concave, and both are aspherical.

The third lens 430 has positive refractive power and is made of plastic. Its object side surface 432 is convex, and its image side surface 434 is concave. Both are aspherical, and its image side surface 434 has an inflection point.

The fourth lens 440 has positive refractive power and is made of plastic. Its object side surface 442 is concave, and its image side surface 444 is convex, and both are aspherical.

The fifth lens 450 has negative refractive power and is made of plastic. Its object side surface 452 is concave, and its image side surface 454 is concave. Both are aspherical, and its object side surface 452 has two inflection points. This helps shorten the rear focal length to maintain miniaturization.

The infrared filter 480 is made of glass and is disposed between the fifth lens 450 and the infrared imaging surface 490 and does not affect the focal length of the optical imaging system.

Please refer to Table 7 and Table 8 below.

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

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

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

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

Fifth embodiment

Please refer to 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, astigmatism and optical distortion curves of the optical imaging system of the fifth embodiment from left to right. Figure 5C shows the lateral aberration diagram of the optical imaging system of the fifth embodiment at 0.7 field of view. As can be seen from Figure 5A, the optical imaging system includes a first lens 510, an aperture 500, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, an infrared filter 580, an infrared imaging surface 590 and an image sensing element 592 in order from the object side to the image side.

The first lens 510 has positive refractive power and is made of plastic. Its object side surface 512 is convex, and its image side surface 514 is concave. Both are aspherical surfaces, and both the object side surface 512 and the image side surface 514 have an inflection point.

The second lens 520 has negative refractive power and is made of plastic. Its object side surface 522 is concave, and its image side surface 524 is concave, and both are aspherical.

The third lens 530 has positive refractive power and is made of plastic. Its object side surface 532 is convex, and its image side surface 534 is concave. Both are aspherical surfaces, and its image side surface 534 has two inflection points.

The fourth lens 540 has positive refractive power and is made of plastic. Its object side surface 542 is concave, and its image side surface 544 is convex. Both are aspherical surfaces, and its image side surface 544 has one inflection point and three inflection points.

The fifth lens 550 has negative refractive power and is made of plastic. Its object side surface 552 is concave, and its image side surface 554 is concave. Both are aspherical, and its image side surface 554 has three anti-inflection points and the image side surface 554 has two anti-inflection points. This helps shorten the rear focal length to maintain miniaturization.

The infrared filter 580 is made of glass and is disposed between the fifth lens 550 and the infrared imaging surface 590 and does not affect the focal length of the optical imaging system.

Please refer to Table 9 and Table 10 below.

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

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:

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

Sixth embodiment

Please refer to Figure 6A and Figure 6B, wherein Figure 6A shows a schematic diagram of an optical imaging system according to the sixth embodiment of the present invention, and Figure 6B shows the spherical aberration, astigmatism and optical distortion curves of the optical imaging system of the sixth embodiment from left to right. Figure 6C shows the lateral aberration diagram of the optical imaging system of the sixth embodiment at a field of view of 0.7. As can be seen from Figure 6A, the optical imaging system includes a first lens 610, an aperture 600, a second lens 620, a third lens 630, a fourth lens 640, a fifth lens 650, an infrared filter 680, an infrared imaging surface 690 and an image sensing element 692 in order from the object side to the image side.

The first lens 610 has positive refractive power and is made of plastic. Its object side surface 612 is convex, and its image side surface 614 is concave. Both are aspherical. Its object side surface 612 has two inflection points and its image side surface 614 has one inflection point.

The second lens 620 has negative refractive power and is made of plastic. Its object side surface 622 is convex, and its image side surface 624 is concave. Both are aspherical, and its object side surface 612 has an inflection point.

The third lens 630 has positive refractive power and is made of plastic. Its object side surface 632 is convex, and its image side surface 634 is concave. Both are aspherical, and its image side surface 634 has two inflection points.

The fourth lens 640 has positive refractive power and is made of plastic. Its object side surface 642 is concave, and its image side surface 644 is convex. Both are aspherical. Its object side surface 632 has an inflection point and its image side surface 644 has three inflection points.

The fifth lens 650 has negative refractive power and is made of plastic. Its object side surface 652 is concave, and its image side surface 654 is concave. Both are aspherical, and its object side surface 652 has an inflection point and the image side surface 644 has two inflection points. This is conducive to shortening the rear focal length to maintain compactness. In addition, it can also effectively suppress the angle of incidence of off-axis field of view light, and further correct the aberration of the off-axis field of view.

The infrared filter 680 is made of glass and is disposed between the fifth lens 650 and the infrared imaging surface 690 and does not affect the focal length of the optical imaging system.

Please refer to Table 11 and Table 12 below.

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

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:

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

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

Although the present invention has been particularly shown and described with reference to its exemplary embodiments, it will be understood by those skilled in the art that various changes in form and details may be made without departing from the spirit and scope of the present invention as defined by the following patent claims and their equivalents.

200: aperture

210: First lens

212: Object side

214: Like the side

220: Second lens

222: Object side

224: Like the side

230: The third lens

232: Object side

234: Like the side

240: The fourth lens

242: Object side

244: Like the side

250: The fifth lens

252: Object side

254: Like the side

280: Infrared filter

290: Imaging surface

292: Image sensor element

Claims (27)

An optical imaging system comprises, from the object side to the image side, a first lens having positive refractive power, whose object side surface is convex on the optical axis and whose image side surface is concave on the optical axis; a second lens having refractive power; a third lens having positive refractive power; a fourth lens having positive refractive power; a fifth lens having refractive power; and an imaging surface, wherein the optical imaging system has five lenses having refractive power, the focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, and f5, respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the distance from the object side surface of the first lens to the imaging surface is A distance HOS, a distance InTL on the optical axis from the object side of the first lens to the image side of the fifth lens, half of the maximum viewing angle of the optical imaging system is HAF, starting from the intersection of any surface of any lens among the lenses and the optical axis, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 of the entrance pupil diameter from the optical axis, the contour curve length between the above two points is ARE, which meets the following conditions: 1.98≦f/HEP≦2.02; 41.0488deg<HAF≦43.5878deg and 1.0000≦2(ARE/HEP)≦1.0741. The optical imaging system as described in claim 1, wherein the focal length of the fourth lens is f4, which satisfies the following condition: 0.4456≦f4/f≦0.4720. The optical imaging system as described in claim 1, wherein the distance between the first lens and the second lens on the optical axis is IN12, and the distance between the third lens and the fourth lens on the optical axis is IN34, which satisfies the following condition: 1.0134≦IN34/IN12≦1.6404. The optical imaging system as described in claim 1, wherein the thicknesses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis are TP1, TP2, TP3, TP4 and TP5 respectively, which meet the following conditions: TP4>TP1>TP5>TP3>TP2. The optical imaging system as described in claim 1, wherein the thicknesses of the second lens and the fourth lens on the optical axis are TP2 and TP4 respectively, which satisfy the following condition: 2.1674≦TP4/TP2≦2.3600. An optical imaging system as described in claim 1, wherein the optical imaging system satisfies the following conditions: 1.27849≦HOS/f≦1.34203. An optical imaging system as described in claim 1, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, which satisfies the following conditions: 1.3843≦HOS/HOI≦1.4118. The optical imaging system as described in claim 1, wherein the TV distortion of the optical imaging system when forming an image is TDT, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, the longest working wavelength of the positive meridian 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, and the positive meridian light fan The shortest working wavelength passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7 HOI. The lateral aberration is represented by PSTA. The longest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7 HOI. The lateral aberration is represented by NLTA. The shortest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging surface at 0.7 HOI. NSTA indicates that the longest working wavelength of the sagittal plane fan 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 SLTA, and the shortest working wavelength of the sagittal plane fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI. The lateral aberration is represented by SSTA, which meets the following conditions: -9.1954 microns ≦ PLTA ≦ 0.4740 microns; -5 .2392≦PSTA≦2.3548 microns; -7.4047 microns≦NLTA≦6.3108 microns; -6.0567 microns≦NSTA≦9.1851 microns; 2.8497 microns≦SLTA≦5.4879 microns; and 2.6360 microns≦SSTA≦4.6346 microns; 0.8836%≦｜TDT｜≦2.8948%. The optical imaging system as described in claim 1 further includes an aperture, and there is a distance InS on the optical axis from the aperture to the imaging plane, which satisfies the following formula: 0.8509≦InS/HOS≦0.8634. An optical imaging system comprises, from the object side to the image side, a first lens having positive refractive power, whose object side surface is convex on the optical axis and whose image side surface is concave on the optical axis; a second lens having refractive power; a third lens having positive refractive power, whose object side surface has at least two anti-inflection points; a fourth lens having positive refractive power; a fifth lens having refractive power; and an imaging surface, wherein the optical imaging system has five lenses having refractive power, the focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, and f5, respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the distance from the object side of the first lens to the imaging surface is The surface has a distance HOS on the optical axis, the object side of the first lens to the image side of the fifth lens has a distance InTL on the optical axis, half of the maximum viewing angle of the optical imaging system is HAF, and the intersection of any surface of any lens in the lenses and the optical axis is taken as the starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 of the entrance pupil diameter from the optical axis is taken as the end, and the contour curve length between the above two points is ARE, which meets the following conditions: 1.99≦f/HEP≦2.01; 41.6684deg<HAF≦42.9531deg and 1.0001≦2(ARE/HEP)≦1.0740. An optical imaging system as described in claim 10, wherein the focal length of the fourth lens is f4, which satisfies the following condition: 0.4457≦f4/f≦0.4538. An optical imaging system as described in claim 10, wherein the focal length of the first lens is f1, which satisfies the following condition: 1.0401≦f1/f≦1.2876. The optical imaging system as described in claim 10, wherein the distance between the first lens and the second lens on the optical axis is IN12, and the distance between the third lens and the fourth lens on the optical axis is IN34, which satisfies the following condition: 1.0818≦IN34/IN12≦1.3377. The optical imaging system as described in claim 10, wherein the thicknesses of the first lens, the second lens, the third lens, the fourth lens and the fifth lens on the optical axis are TP1, TP2, TP3, TP4 and TP5 respectively, which meet the following conditions: TP4>TP1>TP5>TP3>TP2. The optical imaging system as described in claim 10, wherein the thicknesses of the second lens and the fourth lens on the optical axis are TP2 and TP4 respectively, which satisfy the following condition: 2.2085≦TP4/TP2≦2.3319. An optical imaging system as described in claim 10, wherein the optical imaging system satisfies the following conditions: 1.28419≦HOS/f≦1.34190. An optical imaging system as described in claim 10, wherein the TV distortion of the optical imaging system during imaging is TDT, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the longest operating wavelength of the positive meridian 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, and the positive meridian light fan The shortest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by PSTA. The longest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by NLTA. The shortest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. NSTA indicates that the longest working wavelength of the sagittal plane fan 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 SLTA, and the shortest working wavelength of the sagittal plane fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI. The lateral aberration is represented by SSTA, which meets the following conditions: -4.6265 microns ≦ PLTA ≦ 0.4740 microns; -3 .1668≦PSTA≦ 2.3548 microns; -7.4047 microns≦NLTA≦5.3542 microns; -6.0567 microns≦NSTA≦8.2128 microns; 2.8497 microns≦SLTA≦4.9157 microns; and 2.6564 microns≦SSTA≦4.5745 microns; 1.0346%≦｜TDT｜≦2.6564%. The optical imaging system as described in claim 10 further includes an aperture, and there is a distance InS on the optical axis from the aperture to the imaging plane, which satisfies the following formula: 0.8509≦InS/HOS≦0.8591. An optical imaging system as described in claim 10, wherein the object side of the third lens has three inflection points. An optical imaging system comprises, from the object side to the image side, a first lens having positive refractive power, whose object side surface is convex on the optical axis and whose image side surface is concave on the optical axis; a second lens having negative refractive power; a third lens having positive refractive power, whose object side surface has at least three anti-inflection points; a fourth lens having positive refractive power; a fifth lens having negative refractive power; and an imaging surface, wherein the optical imaging system has five lenses having refractive power, the focal lengths of the first lens to the fifth lens are f1, f2, f3, f4, and f5, respectively, the focal length of the optical imaging system is f, the entrance pupil diameter of the optical imaging system is HEP, the distance from the object side of the first lens to the imaging surface is The surface has a distance HOS on the optical axis, the object side of the first lens to the image side of the fifth lens has a distance InTL on the optical axis, and half of the maximum viewing angle of the optical imaging system is HAF. The intersection of any surface of any lens in these lenses and the optical axis is taken as the starting point, along the contour of the surface until the coordinate point on the surface at a vertical height of 1/2 of the entrance pupil diameter from the optical axis is taken as the end. The length of the contour curve between the above two points is ARE, which meets the following conditions: 2.00≦f/HEP≦2.01; 42.3183deg<HAF≦42.9531deg and 1.0003≦2(ARE/HEP)≦1.0740. An optical imaging system as described in claim 20, wherein the object side surface and the image side surface of the second lens are both concave surfaces on the optical axis, and the object side surface and the image side surface of the fifth lens are both concave surfaces on the optical axis. An optical imaging system as described in claim 20, wherein the focal length of the fourth lens is f4, which satisfies the following condition: 0.4477≦f4/f≦0.4533. An optical imaging system as described in claim 20, wherein the focal length of the first lens is f1, which satisfies the following condition: 1.0401≦f1/f≦1.1783. The optical imaging system as described in claim 20, wherein the thicknesses of the second lens and the fourth lens on the optical axis are TP2 and TP4 respectively, which satisfy the following condition: 2.2361≦TP4/TP2≦2.2489. An optical imaging system as described in claim 20, wherein the optical imaging system satisfies the following conditions: 1.30192≦HOS/f≦1.33325. An optical imaging system as described in claim 20, wherein the TV distortion of the optical imaging system when forming an image is TDT, wherein the optical imaging system has a maximum imaging height HOI perpendicular to the optical axis on the imaging plane, and the longest working wavelength of the 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, and the positive meridian plane light fan is The shortest working wavelength of the fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by PSTA. The longest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The lateral aberration is represented by NLTA. The shortest working wavelength of the negative meridian light fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7HOI. The longest working wavelength of the sagittal plane fan 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 NSTA, the shortest working wavelength of the sagittal plane fan passes through the edge of the entrance pupil and is incident on the imaging plane at 0.7 HOI. The lateral aberration is represented by SSTA, which meets the following conditions: -19257 microns ≦ PLTA ≦ 0.4740 microns; -1 .9581≦PSTA≦2.3548 microns; -7.4047 microns≦NLTA≦2.2673 microns; -6.0567 microns≦NSTA≦5.1184 microns; 2.8497 microns≦SLTA≦3.8144 microns; and 2.9001 microns≦SSTA≦4.5745 microns; 1.2087%≦｜TDT｜≦2.4203%. The optical imaging system as described in claim 20, wherein the optical imaging system further includes an aperture, an image sensing element and a driving module, the image sensing element is disposed on the imaging surface, and there is a distance InS on the optical axis from the aperture to the imaging surface, the driving module can be coupled with the lenses and cause the lenses to displace, which satisfies the following formula: 0.8509≦InS/HOS≦0.8574.

Images