CN113238345B

CN113238345B - Optical system, image capturing device, electronic equipment and carrier

Info

Publication number: CN113238345B
Application number: CN202110569444.7A
Authority: CN
Inventors: 蔡雄宇; 乐宇明; 赵迪
Original assignee: Tianjin OFilm Opto Electronics Co Ltd
Current assignee: Jiangxi Oufei Optics Co ltd
Priority date: 2021-05-25
Filing date: 2021-05-25
Publication date: 2022-05-20
Anticipated expiration: 2041-05-25
Also published as: CN113238345A

Abstract

The application discloses an optical system, an image capturing device, an electronic device and a carrier, which comprise a first lens with negative refractive power, wherein the object side surface is a plane, and the image side surface is a concave surface; a second lens element with positive refractive power having a convex object-side surface and a convex image-side surface; a third lens element with refractive power having a convex object-side surface and a concave image-side surface; a fourth lens element with negative refractive power having a concave object-side surface; a fifth lens element with positive refractive power having a convex image-side surface; a sixth lens element with positive refractive power; the optical system further comprises a diaphragm arranged between the object side of the optical system and an imaging surface of the optical system; the distance TTL from the object side surface of the first lens element to the imaging surface of the optical system on the optical axis and the distance DOS from the object side surface of the first lens element to the diaphragm on the optical axis satisfy the following conditional expressions: 2.6< TTL/DOS < 3.6. The design can accurately shoot the state of the driver and the change of the driving environment outside the cockpit in the daytime or in the environment with dark light beams, so that the life safety of the driver is guaranteed.

Description

Optical system, image capturing device, electronic equipment and carrier

Technical Field

The present application relates to the field of optical imaging technologies, and in particular, to an optical system, an image capturing device, an electronic apparatus, and a carrier.

Background

With the development of society, the requirements for safety and monitoring in various fields are higher and higher, and particularly in the vehicle-mounted industry, the application of ADAS (Advanced Driving Assistance System), DMS (Driver Monitor Status), and CMS (Camera Monitor System) in the aspect of vehicle-mounted Driving is gradually promoted. The method not only requires monitoring the state of the driver, for example, the state of the driver can be presumed through relevant information such as the eye state, the eye closing times, the yawning times and the like of the driver, but also requires monitoring and identifying the driving environment outside a driving cabin so as to comprehensively monitor the change of the driving state of the driver and send out corresponding safety early warning to remind the driver of the change of the driving state and enable the driver to make prevention in advance.

However, the current camera monitoring devices on the market cannot be simultaneously applied to environments with dark daytime or light beams (such as tunnels and underground parking lots), so that the state of the driver and the change of the driving environment outside the cockpit cannot be accurately shot, and accurate safety early warning cannot be sent out, thereby endangering the life safety of the driver. Therefore, how to design an optical system capable of accurately capturing the state of the driver and the change of the driving environment outside the cabin in the daytime or in the environment with dark light beams is a problem to be solved urgently to ensure the life safety of the driver.

Disclosure of Invention

The embodiment of the application provides an optical system, an image capturing device, an electronic device and a carrier, which can accurately capture the state of a driver and the change of a driving environment outside a cab in the daytime or in the environment with dark light beams to guarantee the life safety of the driver.

In a first aspect, embodiments of the present application provide an optical system; the optical system includes, in order from an object side to an image side along an optical axis:

the first lens element with negative refractive power has a planar object-side surface and a concave image-side surface;

the second lens element with positive refractive power has a convex object-side surface at paraxial region and a convex image-side surface at paraxial region;

a third lens element with refractive power having a convex object-side surface and a concave image-side surface;

a fourth lens element with negative refractive power having a concave object-side surface at paraxial region;

a fifth lens element with positive refractive power having a convex image-side surface at paraxial region; and

a sixth lens element with positive refractive power;

the optical system further comprises a diaphragm, and the diaphragm is arranged between the object side of the optical system and the imaging surface of the optical system;

the distance from the object side surface of the first lens to the imaging surface of the optical system on the optical axis is TTL, and the distance from the object side surface of the first lens to the diaphragm on the optical axis is DOS, wherein TTL and DOS satisfy the following conditional expressions:

2.6<TTL/DOS<3.6。

based on the optical system of the embodiment of the application, when the TTL/DOS is more than 2.6 and less than 3.6, the TTL and the DOS are controlled through parameter design to enable the ratio of the TTL to the DOS to be reasonably configured, so that the distance between the lenses is reasonably configured, the structure of the optical system is compact, and the miniaturization design is favorably realized; when TTL/DOS is less than or equal to 2.6, the large-angle light beams are difficult to enter the optical system, so that the object space imaging range of the optical system is reduced; when TTL/DOS is more than or equal to 3.6, the optical total length of the optical system is too long, which is not beneficial to realizing the miniaturization design of the optical system; the first lens element with negative refractive power has a planar object-side surface at a paraxial region and a concave image-side surface at a paraxial region, so that the light beams incident at a large angle can be deflected to realize a large viewing angle; the second lens element with positive refractive power has convex object-side and image-side surfaces at paraxial region, so that the second lens element can deflect the light beam from the first lens element in time and effectively, and is especially suitable for adjusting field curvature and astigmatism of marginal field in large-view optical system; the third lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, so that the deflection of the first lens element and the second lens element on incident light beams can be effectively prevented from being too large, and the light beams from the first lens element and the second lens element can be deflected gently after passing through the third lens element, thereby being beneficial to inhibiting the generation of aberration; the fourth lens is designed to have negative refractive power, and the object side surface of the fourth lens is concave at a position close to the optical axis, so that timely and effective deflection of the collected large-angle light beams can be further facilitated, and the collected large-angle light beams can be further widened; furthermore, the fifth lens element and the sixth lens element are designed to have positive refractive power, and the image side surface of the fifth lens element at the paraxial region is convex, so that incident light beams of each field of view can be smoothly deflected to converge on an imaging surface when passing through a rear lens group in the optical system, spherical aberration, chromatic aberration, field curvature, astigmatism and aberration of the optical system are well suppressed, and the imaging definition of the optical system can be further improved; that is, the refractive power and the surface shape of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are reasonably configured, so that the aberration of the optical system can be corrected, the imaging quality of the optical system can be improved, the state of the driver and the change of the driving environment outside the cockpit can be accurately shot in the daytime or in the environment with dark light beams, the life safety of the driver can be guaranteed, and all-weather work can be realized.

In some of these embodiments, the thickness of the third lens at the optical axis is CT3, the sagittal height at the maximum optically effective half aperture of the image side surface of the third lens is SAGs6, where CT3 and SAGs6 satisfy the conditional expression:

2.4<CT3/SAGs6<3.7。

based on the above embodiments, the third lens element may be a positive lens element or a negative lens element, and when the third lens element is designed as a positive lens element, the third lens element provides a positive refractive power to the optical system, so as to focus the light beam, thereby facilitating to effectively transmit more light beams to the imaging surface of the optical system, and improving the imaging quality of the optical system; when the third lens element is designed as a negative lens element, the third lens element provides negative refractive power to the optical system, which facilitates the optical system to acquire more object space information, i.e. increases the field angle of the optical system; when the refractive power of the third lens is 2.4< CT3/SAGs6<3.7, the ratio of CT3 to SAGs6 is reasonably configured by controlling the design of parameters CT3 and SAGs6, so that the problem that the processing difficulty of the third lens is increased due to the fact that the central thickness of the third lens is too large or the image side surface of the third lens is too curved when the refractive power of the third lens is met is effectively avoided, and the effect of reducing the production cost is achieved; when the CT3/SAGs6 is less than or equal to 2.4, the image side surface of the third lens is too curved, so that the processing difficulty of the third lens is increased, the processing cost of the third lens is increased, and meanwhile, the image side surface of the third lens is too curved, so that edge aberration is easily generated, and the improvement of the imaging quality of the optical system is not facilitated; when CT3/SAGs6 is 3.7 or more, the center thickness of the third lens is too large, which is disadvantageous in realizing a light weight and compact design of the optical system.

In some embodiments, the radius of curvature of the object-side surface of the third lens at the optical axis is Rs5, and the radius of curvature of the image-side surface of the third lens at the optical axis is Rs6, where Rs5 and Rs6 satisfy the following conditional expression:

8.0<(Rs5+Rs6)/(Rs5-Rs6)<16.0。

based on the above embodiments, the curvature radius of the third lens affects the bending degree of the third lens, and the deflection effect generated by the light beam after passing through the surface of the third lens with different bending degrees is also different, when 8.0< (Rs5+ Rs6)/(Rs5-Rs6) <16.0, the ratio of (Rs5+ Rs6) to (Rs5-Rs6) is reasonably configured by design control of parameters (Rs5+ Rs6) and (Rs5-Rs6), which is beneficial to correcting the edge aberration generated by the optical system in the edge field of view, so as to suppress the generation of astigmatism, reduce the angle of the main light beam at the peripheral angle of view incident on the imaging plane, and thus improve the imaging quality of the optical system; when the ratio of (Rs5+ Rs6)/(Rs5-Rs6) is less than or equal to 8.0 or when the ratio of (Rs5+ Rs6)/(Rs5-Rs6) is more than or equal to 16.0, the correction of the aberration of the optical system is not facilitated.

In some embodiments, the maximum field angle of the optical system is FOV, the effective focal length of the optical system is f, half of the image height corresponding to the maximum field angle of the optical system is Imgh, and FOV, f, and Imgh satisfy the conditional expression:

55.5deg<(FOV*f)/(2*Imgh)<70.5deg。

based on the above embodiment, when 55.5deg < (FOV x f)/(2 x Imgh) <70.5deg, the ratio of (FOV x f) to (2 x Imgh) is reasonably configured by design control of parameters (FOV x f) and 2 x Imgh, so that the optical system has good optical performance, the characteristics of a large viewing angle, a large image plane and high pixels of the optical system are realized, the details of a photographed object can be well captured, the imaging quality of the optical system is improved, and in addition, a good inhibition effect on distortion of the optical system can be achieved, so that the optical system has a large viewing angle characteristic and a low distortion risk; when (FOV x f)/(2 x Imgh) is equal to or less than 55.5deg or (FOV x f)/(2 x Imgh) is equal to or more than 70.5deg, the image plane of the optical system is small and the pixels are low, and the large angle range image capturing is not satisfied, so that the details of the subject cannot be captured well, resulting in poor image quality of the optical system.

In some of these embodiments, the maximum clear aperture diameter of the object-side surface of the fourth lens is SDs8, and the sagittal height at the maximum optically effective half aperture of the object-side surface of the fourth lens is sag 8, wherein SDs8 and sag 8 satisfy the conditional expression:

11.5<SDs8/|SAGs8|<33.5。

based on the above embodiment, when 11.5< SDs8/| SAGs8| <33.5, the ratio of the SDs8 to the | SAGs8| is reasonably configured by design control of parameters of the SDs8 and the | SAGs8|, when the ratio of the two satisfies a lower limit greater than a conditional expression, the problem that the processing difficulty of the fourth lens is increased due to too much bending of the surface of the object-side surface of the fourth lens can be effectively avoided, the problem that the surface coating of the fourth lens is uneven due to too much bending of the surface of the object-side surface of the fourth lens can be effectively avoided, the problem that the optical system is poor in imaging quality due to the fact that a light beam with a large angle cannot enter the optical system is also effectively avoided, and when the ratio of the two satisfies an upper limit less than the conditional expression, the risk that the object-side surface of the fourth lens is too flat and the optical system generates ghost is effectively avoided; when the SDs8/| SAGs8| is less than or equal to 11.5, the surface shape of the object side surface of the fourth lens is over-bent, which can increase the processing difficulty of the fourth lens, and can also cause the uneven film coating on the surface of the fourth lens, and can also cause the condition that a large-angle light beam cannot enter the optical system, thereby causing poor imaging quality; when SDs8/| SAGs8| ≧ 33.5, the surface profile of the object-side surface of the fourth lens is excessively flat, increasing the risk of the optical system generating ghost images.

In some of the embodiments, the thickness of the fourth lens at the optical axis is CT4, the thermal expansion coefficient of the fourth lens at-30 ℃ to 70 ℃ is α 4, the thickness of the fifth lens at the optical axis is CT5, and the thermal expansion coefficient of the fifth lens at-30 ℃ to 70 ℃ is α 5, wherein CT4, α 4, CT5 and α 5 satisfy the following conditional expressions:

-3.0mm*10^-6/℃<(CT5-CT4)*(α5-α4)<0.0mm*10^-6/℃。

based on the above embodiment, the influence of temperature on the optical system is reduced by reasonable matching of materials, when-3.0 mm 10^-6/℃<(CT5-CT4)*(α5-α4)<0.0mm*10^-6Design of pass parameter at/° CThe product of (CT5-CT4) and (alpha 5-alpha 4) is reasonably configured by controlling (CT5-CT4) and (alpha 5-alpha 4), so that the optical system keeps good imaging quality under high-temperature or low-temperature conditions, the difference of the central thicknesses of the fourth lens and the fifth lens can be reduced, and the difference of the material characteristics of the fourth lens and the fifth lens can be reduced, so that when the fourth lens and the fifth lens are glued, the risk of the fourth lens and the fifth lens being cracked can be reduced, and the optical system still has good resolving power under high-temperature or low-temperature conditions; when (CT5-CT4) (alpha 5-alpha 4) is less than or equal to-3.0 mm 10^-6At/° C or when (CT5-CT4) (. alpha.5-. alpha.4) ≥ 0.0mm 10^-6When the fourth lens and the fifth lens are bonded, the risk of the fourth lens and the fifth lens being cracked is increased, and the resolving power of the optical system under the high temperature or low temperature condition is poor.

In some embodiments, the focal length of the first lens is f1, the focal length of the second lens is f2, and the effective focal length of the optical system is f, where f1, f2, and f satisfy the following conditional expression:

-10.6mm<f1*f2/f<-8.0mm。

based on the above embodiment, when-10.6 mm < f1 f2/f < -8.0mm, the ratio of f1 f2 to f is reasonably configured by controlling f1 f2 and f through parameter design, so that the excessive high power and the excessive strong refractive power of the first lens and the second lens can be avoided, the high-order aberration caused by peripheral beams of the imaging area of the lenses can be favorably inhibited, and meanwhile, the chromatic aberration which is difficult to correct can be inhibited, thereby realizing the high-resolution performance of the optical system; when f1 f2/f is less than or equal to-10.6 mm or f1 f2/f is more than or equal to-8.0 mm, the optical power of the first lens and the second lens is too large and the refractive power is too strong, which is not favorable for inhibiting high-order aberration caused by peripheral light beams in an imaging area of the lenses and is easy to generate color aberration which is difficult to correct, thereby reducing the high resolution performance of the optical system.

In some embodiments, the combined focal length of the fourth lens and the fifth lens is f45, and the effective focal length of the optical system is f, where f45 and f satisfy the following conditional expression:

1.1<f45/f<4.1。

based on the above embodiment, by matching the fourth lens element with negative refractive power and the fifth lens element with positive refractive power, the aberrations generated by each other can be mutually offset, and when 1.1< f45/f <4.1, the ratio of f45 to f is reasonably configured by controlling f45 and f through parameter design, thereby facilitating the correction of the aberration of the optical system; when f45/f is less than or equal to 1.1, the combined focal length of the fourth lens element and the fifth lens element is too small, and the overall refractive power of the fourth lens element and the fifth lens element is too strong, so that the lens assembly is prone to generating a relatively serious astigmatism phenomenon, which is not favorable for improving the imaging quality of the optical system; when f45/f is greater than or equal to 4.1, the combined focal length of the fourth lens element and the fifth lens element is too large, so that the overall refractive power of the fourth lens element and the fifth lens element is too small, and the optical system is prone to generate large peripheral field aberration and also generates chromatic aberration which is difficult to correct, which is not favorable for achieving high resolution performance of the optical system.

In some embodiments, the focal length of the sixth lens is f6, and the effective focal length of the optical system is f, where f6 and f satisfy the following conditional expression:

1.3<f6/f<5.6。

based on the above embodiment, the sixth lens element provides positive refractive power for the optical system, and as the last lens element of the optical system, the sixth lens element can collect the light beam emitted from the front lens element, smoothly transmit the light beam to the imaging plane, reduce the angle of the light beam emitted from each field of view to the imaging plane, and avoid the larger curvature of field generated in the peripheral field of view, when 1.3< f6/f <5.6, the ratio of f6 to f is reasonably configured by controlling f6 and f through the design of parameters, which is beneficial to correcting chromatic aberration of the optical system, so as to reduce the eccentric sensitivity of the lens element to the light beam, and also beneficial to correcting the aberration of the optical system, so as to improve the imaging resolution; when f6/f is less than or equal to 1.3 or f6/f is more than or equal to 5.6, the aberration of the optical system is not corrected favorably, and the imaging quality of the optical system is reduced.

In a second aspect, an embodiment of the present application provides an image capturing apparatus, which includes an image sensor and any one of the optical systems described above, wherein the image sensor is disposed on an image side of the optical system.

Based on the image capturing device in the embodiment of the application, the image capturing device with the optical system can accurately capture the state of the driver and the change of the driving environment outside the cockpit in the daytime or in the environment with dark light beams, so that the life safety of the driver is guaranteed.

In a third aspect, an embodiment of the present application provides an electronic device, which includes a mounting structure and the image capturing device described above, where the image capturing device is disposed on the mounting structure.

Based on the electronic equipment in the embodiment of the application, the electronic equipment with the image capturing device can accurately capture the state of the driver and the change of the driving environment outside the cockpit in the daytime or in the environment with dark light beams, so as to guarantee the life safety of the driver.

In a fourth aspect, an embodiment of the present application provides a carrier, which includes a connection structure and the electronic device described above, where the electronic device is disposed on the connection structure.

Based on the vehicle in the embodiment of the application, the vehicle with the electronic equipment can accurately shoot the state of the driver and the change of the driving environment outside the cab in the daytime or in the environment with dark light beams, so as to guarantee the life safety of the driver.

Based on the optical system, the image capturing device, the electronic equipment and the carrier, when the TTL/DOS is more than 2.6 and less than 3.6, the TTL and the DOS are controlled by parameter design to enable the ratio of the TTL to the DOS to be reasonably configured, so that the distance between the lenses is reasonably configured, the optical system is compact in structure and beneficial to realizing miniaturization design; when TTL/DOS is less than or equal to 2.6, the large-angle light beams are difficult to enter the optical system, so that the object space imaging range of the optical system is reduced; when TTL/DOS is more than or equal to 3.6, the optical total length of the optical system is too long, which is not beneficial to realizing the miniaturization design of the optical system; the first lens element with negative refractive power has a planar object-side surface at a paraxial region and a concave image-side surface at a paraxial region, so that the light beams incident at a large angle can be deflected to realize a large viewing angle; the second lens element with positive refractive power has convex object-side and image-side surfaces at paraxial region, so that the second lens element can deflect the light beam from the first lens element in time and effectively, and is especially suitable for adjusting field curvature and astigmatism of marginal field in large-view optical system; the third lens element with refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, so that the deflection of the first lens element and the second lens element on incident light beams can be effectively prevented from being too large, and the light beams from the first lens element and the second lens element can be deflected gently after passing through the third lens element, thereby being beneficial to inhibiting the generation of aberration; the fourth lens is designed to have negative refractive power, and the object side surface of the fourth lens is concave at a position close to the optical axis, so that timely and effective deflection of the collected large-angle light beams can be further facilitated, and the collected large-angle light beams can be further widened; furthermore, the fifth lens element and the sixth lens element are designed to have positive refractive power, and the image side surface of the fifth lens element at the paraxial region is convex, so that incident light beams of each field of view can be smoothly deflected to converge on an imaging surface when passing through a rear lens group in the optical system, spherical aberration, chromatic aberration, field curvature, astigmatism and aberration of the optical system are well suppressed, and the imaging definition of the optical system can be further improved; that is, the refractive power and the surface shape of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are reasonably configured, so that the aberration of the optical system can be corrected, the imaging quality of the optical system can be improved, the state of the driver and the change of the driving environment outside the cockpit can be accurately shot in the daytime or in the environment with dark light beams, the life safety of the driver can be guaranteed, and all-weather work can be realized.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative efforts.

Fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present disclosure;

fig. 2A to 2C respectively illustrate a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system provided in the first embodiment of the present application;

fig. 3 is a schematic structural diagram of an optical system according to a second embodiment of the present application;

fig. 4A to 4C respectively illustrate a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system provided in the second embodiment of the present application;

fig. 5 is a schematic structural diagram of an optical system according to a third embodiment of the present application;

fig. 6A to 6C respectively illustrate a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system provided in the third embodiment of the present application;

fig. 7 is a schematic structural diagram of an optical system according to a fourth embodiment of the present application;

fig. 8A to 8C respectively illustrate a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system provided in the fourth embodiment of the present application;

fig. 9 is a schematic structural diagram of an optical system according to a fifth embodiment of the present application;

fig. 10A to 10C respectively illustrate a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of the optical system provided in the fifth embodiment of the present application;

fig. 11 is a schematic structural diagram of an optical system according to a sixth embodiment of the present application;

fig. 12A to 12C respectively illustrate a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of an optical system provided in a sixth embodiment of the present application;

fig. 13 is a schematic structural diagram of an image capturing apparatus according to an embodiment of the present application;

fig. 14 is a schematic structural diagram of an embodiment of the present application when an electronic device is a vehicle-mounted camera;

fig. 15 is a schematic structural diagram illustrating a vehicle in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The aberrations referred to in the embodiments of the present application are explained first below; aberration (aberration) is a deviation between the result of non-paraxial ray tracing and the result of paraxial ray tracing in an optical lens group and an ideal condition of gaussian optics (first order approximation theory or paraxial ray). Aberrations fall into two broad categories: chromatic aberration and monochromatic aberration. The chromatic aberration is an aberration generated by different refractive indexes when light with different wavelengths passes through the lens, and can be divided into two types, namely, a position chromatic aberration and a magnification chromatic aberration. Chromatic aberration is a chromatic dispersion phenomenon, in which the speed or refractive index of light in a medium varies with the wavelength of light, the dispersion in which the refractive index of light decreases with increasing wavelength can be referred to as normal dispersion, and the dispersion in which the refractive index increases with increasing wavelength can be referred to as negative dispersion (or negative inverse dispersion). Monochromatic aberration is aberration that occurs even when monochromatic light is highly produced, and is divided into two categories, that is, "blurring" and "deforming" according to the effect produced; the former type includes spherical aberration (spherical aberration for short), astigmatism (astigmatism) and the like, and the latter type includes field curvature (field curvature for short), distortion (distortion) and the like. The aberration also includes coma aberration, which is a monochromatic conical light beam emitted from an off-axis object point outside the main axis to the optical lens group, and after being refracted by the optical lens group, the monochromatic conical light beam cannot be combined into a clear point at an ideal plane, but is combined into a comet-shaped light spot dragging a bright tail.

In order to solve the above technical problem, referring to fig. 1 to 12C, a first aspect of the present application provides an optical system 100 capable of accurately capturing changes in the state of a driver and the driving environment outside a cockpit in a daytime or in an environment with dark light beams to ensure the life safety of the driver.

The optical system 100 includes a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, and a sixth lens 160, which are arranged in order from an object side to an image side along an optical axis.

The first lens element 110 with negative refractive power has a planar object-side surface S1 at a paraxial region thereof, and a concave image-side surface S2 of the first lens element 110 at the paraxial region thereof.

The second lens element 120 with positive refractive power has a convex object-side surface S3 at a paraxial region thereof, and has a convex image-side surface S4 at a paraxial region thereof, wherein the second lens element 120 is disposed on the object-side surface S3.

The third lens element 130 with refractive power has positive and negative refractive powers, when the third lens element 130 with positive refractive power has positive refractive power, the object-side surface S5 of the third lens element 130 is convex at a paraxial region, the image-side surface S6 of the third lens element 130 is concave at a paraxial region, when the third lens element 130 with negative refractive power has negative refractive power, the object-side surface S5 of the third lens element 130 is convex at a paraxial region, and the image-side surface S6 of the third lens element 130 is concave at a paraxial region.

The fourth lens element 140 with negative refractive power has a concave object-side surface S7 at a paraxial region thereof, and an image-side surface S8 of the fourth lens element 140 at the paraxial region thereof may be convex, concave or planar.

The fifth lens element 150 with positive refractive power has a convex image-side surface S9 at a paraxial region thereof, and an object-side surface S8 of the fifth lens element 150 at the paraxial region thereof may be convex, concave or planar.

The sixth lens element 160 with positive refractive power has a convex, concave or planar object-side surface S10 at a paraxial region thereof, and the image-side surface S11 of the sixth lens element 160 is convex, concave or planar at a paraxial region thereof.

Further, in order to reduce stray light in the optical system 100 to improve the imaging quality of the optical system 100, the optical system 100 further includes a stop STO, which may be an aperture stop STO or a field stop STO, wherein the aperture stop STO is adopted in the embodiments of the present application. The stop STO is located between the object side of the optical system 100 and the image plane S16, and for example, the stop STO may be provided at any position between the object side of the optical system 100 and the object side surface S1 of the first lens 110, between any two of the first lens 110 to the sixth lens 160, and between the image side surface S11 of the sixth lens 160 and the image plane S16 of the optical system 100. In the embodiment of the present application, the stop STO is disposed between the image-side surface S6 of the third lens 130 and the object-side surface S7 of the fourth lens 140. In this design, the setting of the stop STO can effectively reduce the risk of generating ghost, so as to improve the imaging quality of the optical system 100.

Further, an axial distance from the object-side surface S1 of the first lens element 110 to the image plane S16 of the optical system 100 is TTL, and an axial distance from the object-side surface S1 of the first lens element 110 to the stop STO is DOS, where TTL and DOS satisfy the following conditional expression: 2.6< TTL/DOS < 3.6. Specifically, TTL/DOS may take the value of 3.504, 3.064, 3.082, 2.991, 2.863, or 3.030.

In summary, when TTL/DOS is greater than 2.6 and less than 3.6, the TTL and DOS are controlled by parameter design to reasonably configure the ratio of TTL to DOS, so that the distance between the lenses is reasonably configured, and the optical system 100 is compact in structure and beneficial to implementing a miniaturized design; when TTL/DOS is less than or equal to 2.6, the large-angle light beam is difficult to enter the optical system 100, so that the object space imaging range of the optical system 100 is reduced; when TTL/DOS is greater than or equal to 3.6, the optical total length of the optical system 100 is too long, which is not favorable for realizing the miniaturized design of the optical system 100; by designing the first lens element 110 with negative refractive power, and the object-side surface S1 of the first lens element 110 is planar at the paraxial region and the image-side surface S2 thereof is concave at the paraxial region, it is beneficial to implement deflection of light beams incident at large angles, so as to implement the large-angle characteristic of the optical system 100; by designing the second lens element 120 with positive refractive power, and the object-side surface S3 and the image-side surface S4 being convex at paraxial region, the second lens element 120 can deflect the light beam from the first lens element 110 timely and effectively, and is particularly favorable for adjusting the curvature of field and astigmatism of the peripheral field in the wide-angle optical system 100; by designing the third lens element 130 to have refractive power, and the object-side surface S5 of the third lens element 130 is convex at the paraxial region and the image-side surface S6 thereof is concave at the paraxial region, it can effectively prevent the first lens element 110 and the second lens element 120 from deflecting incident light beams too much, so that the light beams from the first lens element 110 and the second lens element 120 can be deflected smoothly after passing through the third lens element 130, thereby being beneficial to suppressing the generation of aberration; by designing the fourth lens element 140 with negative refractive power and making the object-side surface S7 of the fourth lens element 140 concave at the paraxial region, timely and effective deflection of the collected large-angle light beams can be further facilitated, so that the collected large-angle light beams can be further broadened; furthermore, the fifth lens element 150 and the sixth lens element 160 are designed to have positive refractive power, and the image-side surface S9 of the fifth lens element 150 is disposed to be convex at the paraxial region, so that incident light beams of each field of view can be smoothly deflected to converge on the imaging surface S16 when passing through the rear end lens group of the optical system 100, spherical aberration, chromatic aberration, curvature of field, astigmatism and aberration of the optical system 100 are well suppressed, and the imaging sharpness of the optical system 100 can be further improved; that is, the refractive powers and the surface shapes of the first lens element 110, the second lens element 120, the third lens element 130, the fourth lens element 140, the fifth lens element 150 and the sixth lens element 160 are reasonably configured, so that the aberration of the optical system 100 can be corrected, the imaging quality of the optical system 100 can be improved, the state of the driver and the change of the driving environment outside the cockpit can be accurately photographed in the daytime or in the environment with dark light beams, the life safety of the driver can be guaranteed, and all-weather work can be realized.

Further, in some embodiments, the thickness of the third lens 130 at the optical axis is CT3, and the sagittal height at the maximum optically effective half aperture of the image-side surface S4 of the third lens 130 is SAGs6, wherein CT3 and SAGs6 satisfy the conditional expression: 2.4< CT3/SAGs6< 3.7. Specifically, CT3/SAGs6 may take on values of 2.635, 2.706, 2.447, 2.739, 2.944, or 3.684. In the design, the third lens element 130 may be a positive lens element or a negative lens element, and when the third lens element 130 is designed as a positive lens element, the third lens element 130 provides positive refractive power for the optical system 100 to focus light beams, so as to effectively transmit more light beams to the image plane S16 of the optical system 100, thereby improving the imaging quality of the optical system 100; when the third lens element 130 is designed as a negative lens element, the third lens element 130 provides negative refractive power to the optical system 100, so as to facilitate the optical system 100 to obtain more object space information, i.e. to increase the field angle of the optical system 100; when 2.4< CT3/SAGs6<3.7, the ratio of CT3 and SAGs6 is reasonably configured by design control of parameters, so that the processing difficulty of the third lens 130 due to the fact that the center thickness of the third lens 130 is too large or the image side surface S6 of the third lens 130 is too curved when the refractive power of the third lens 130 is met is effectively avoided, and the production cost is reduced; when the CT3/SAGs6 is less than or equal to 2.4, the image-side surface S6 of the third lens element 130 is too curved, which increases the processing difficulty of the third lens element 130 and increases the processing cost of the third lens element 130, and meanwhile, the image-side surface S6 of the third lens element 130 is too curved, which easily generates edge aberration and is not favorable for improving the imaging quality of the optical system 100; when CT3/SAGs6 is 3.7 or more, the center thickness of the third lens 130 is too large, which is disadvantageous in realizing a light weight and compact design of the optical system 100.

Further, in some embodiments, the curvature radius of the object-side surface S5 of the third lens element 130 at the optical axis is Rs5, and the curvature radius of the image-side surface S6 of the third lens element 130 at the optical axis is Rs6, wherein Rs5 and Rs6 satisfy the following conditional expressions: 8.0< (Rs5+ Rs6)/(Rs5-Rs6) < 16.0. Specifically, the value of (Rs5+ Rs6)/(Rs5-Rs6) may be 15.812, 12.393, 13.460, 11.898, 10.671 or 8.295. In the design, the curvature radius of the third lens element 130 affects the bending degree of the third lens element 130, and the deflection effect generated by the light beam after passing through the surface of the third lens element 130 with different bending degrees is also different, when 8.0< (Rs5+ Rs6)/(Rs5-Rs6) <16.0, the ratio of (Rs5+ Rs6) to (Rs5-Rs6) is reasonably configured by design control of parameters (Rs5+ Rs6) and (Rs5-Rs6), which is beneficial to correcting the edge aberration generated by the optical system 130 in the edge field of view to suppress the generation of astigmatism, and reduce the angle of the main light beam incident to the imaging surface S16 at the peripheral angle of view, thereby improving the imaging quality of the optical system 100; when the ratio of (Rs5+ Rs6)/(Rs5-Rs6) is less than or equal to 8.0 or when the ratio of (Rs5+ Rs6)/(Rs5-Rs6) is more than or equal to 16.0, the correction of the aberration of the optical system 100 is not facilitated.

Further, in some embodiments, the maximum field angle of the optical system 100 is FOV, the effective focal length of the optical system 100 is f, half of the image height corresponding to the maximum field angle of the optical system 100 is Imgh, and FOV, f, and Imgh satisfy the conditional expression: 55.5deg < (FOV x f)/(2 x Imgh) <70.5 deg. Specifically, the value of (FOV x f)/(2 x Imgh) may be 57.400, 55.561, 56.271, 57.400, 57.400 or 70.427 in deg. In the design, when 55.5deg < (FOV x f)/(2 x Imgh) <70.5deg, the ratio of (FOV x f) to (2 x Imgh) is reasonably configured by design control of parameters (FOV x f) and (2 x Imgh), so that the optical system 100 has good optical performance, the characteristics of the optical system 100 such as large viewing angle, large image plane and high pixels are realized, the details of the object to be shot can be well captured, the imaging quality of the optical system 100 is improved, in addition, a good inhibition effect on distortion of the optical system 100 can be achieved, and the optical system 100 can have a low distortion risk while having a large viewing angle characteristic; when (FOV x f)/(2 x Imgh) is equal to or less than 55.5deg or (FOV x f)/(2 x Imgh) is equal to or greater than 70.5deg, the image plane of the optical system 100 is small and the pixels are low, and the large angle range imaging is not satisfied, so that the details of the subject cannot be captured well, resulting in poor imaging quality of the optical system 100.

Further, in some embodiments, the maximum clear aperture diameter of the object-side surface S7 of the fourth lens 140 is SDs8, and the sagittal height at the maximum optically effective half aperture of the object-side surface S7 of the fourth lens 140 is SAGs8, wherein SDs8 and SAGs8 satisfy the conditional expressions: 11.5< SDs8/| SAGs8| < 33.5. Specifically, the value of SDs8/| SAGs8| can be 11.622, 26.303, 21.246, 25.187, 30.625, or 33.245. The sagittal height is a distance from the center of the image-side surface S8 of the fourth lens element 140 (i.e., the intersection point of the image-side surface S8 of the fourth lens element 140 and the optical axis) to the maximum optically effective semi-aperture of the surface in the direction parallel to the optical axis, and when the value is a positive value, the maximum effective clear aperture of the surface is closer to the object side of the optical system 100 than the center of the surface in the direction parallel to the optical axis of the optical system 100, and when the value is a negative value, the maximum effective clear aperture of the surface is closer to the image side of the optical system 100 than the center of the surface in the direction parallel to the optical axis of the optical system 100. In the design, when 11.5< SDs8/| SAGs8| <33.5, the ratio of the SDs8 to the | SAGs8| is reasonably configured by controlling the SDs8 and the | SAGs8| through parameter design, when the ratio of the two satisfies a lower limit larger than a conditional expression, the problem that the processing difficulty of the fourth lens 140 is improved due to too much bending of the surface of the object-side surface S7 of the fourth lens 140 can be effectively avoided, and the problem that the surface coating of the fourth lens 140 is uneven due to too much bending of the surface of the object-side surface S7 of the fourth lens 140 can be effectively avoided, and meanwhile, the problem that the imaging quality of the optical system 100 is poor due to the fact that a large-angle light beam cannot enter the optical system 100 is also effectively avoided, and when the ratio of the two satisfies an upper limit smaller than the conditional expression, the risk that the object-side surface S7 of the fourth lens 140 is too flat to increase ghost of the optical system 100 is effectively avoided; when the SDs8/| SAGs8| ≦ 11.5, the surface shape of the object-side surface S7 of the fourth lens 140 is too curved, which may increase the processing difficulty of the fourth lens 140, and may also cause uneven coating on the surface of the fourth lens 140, and may also cause a large-angle light beam not to enter the optical system 100, resulting in poor imaging quality; when SDs8/| SAGs8| ≧ 33.5, the surface profile of the object-side S7 of the fourth lens 140 is too flat, increasing the risk of the optical system 100 generating ghost images.

Further, in some embodiments, the thickness of the fourth lens 140 at the optical axis is CT4, the thermal expansion coefficient of the fourth lens 140 at-30 ℃ to 70 ℃ is α 4, the thickness of the fifth lens 150 at the optical axis is CT5, and the thermal expansion coefficient of the fifth lens 150 at-30 ℃ to 70 ℃ is α 5, wherein CT4, α 4, CT5, and α 5 satisfy the following conditional expressions: -3.0mm 10^-6/℃<(CT5-CT4)*(α5-α4)<0.0mm*10^-6V. C. In particular, (CT5-CT4) (. alpha.5-a.4) may take the value-0.741, -0.092, -0.146, -0.183, -0.192 or-2.680 in mm 10^-6V. C. In this design, the effect of temperature on the optical system 100 is reduced by a reasonable arrangement of materials, when-3.0 mm 10^-6/℃<(CT5-CT4)*(α5-α4)<0.0mm*10^-6at/deg.C, the product of (CT5-CT4) and (α 5- α 4) is reasonably configured by design control of parameters (CT5-CT4) and (α 5- α 4), so that the optical system 100 can maintain good imaging quality under high temperature or low temperature conditions, the difference of the central thickness of the fourth lens 140 and the fifth lens 150 can be reduced, and the difference of the material characteristics of the fourth lens 140 and the fifth lens 150 can be reduced, so that when the fourth lens 140 and the fifth lens 150 are glued, the crack between the fourth lens 140 and the fifth lens 150 can be reducedThe risk of opening makes the optical system 100 still have better resolving power under high temperature or low temperature conditions; when (CT5-CT4) (alpha 5-alpha 4) is less than or equal to-3.0 mm 10^-6At/° C or when (CT5-CT4) (. alpha.5-. alpha.4) ≥ 0.0mm 10^-6The difference in the center thicknesses of the fourth lens 140 and the fifth lens 150 is too large and the difference in the material properties of the fourth lens 140 and the fifth lens 150 is too large at/° c, so that when the fourth lens 140 and the fifth lens 150 are cemented, the risk of the fourth lens 140 and the fifth lens 150 being cracked is increased, so that the resolving power of the optical system 100 under high temperature conditions is poor.

Further, in some embodiments, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, and the effective focal length of the optical system 100 is f, where f1, f2, and f satisfy the following conditional expression: -10.6mm < f1 f2/f < -8.0 mm. Specifically, f1 x f2/f can take the value of-9.908, -9.066, -9.635, -10.168, -10.535 or-8.147, and the unit is mm. In the design, when the optical system is-10.6 mm < f1 f2/f < -8.0mm, the ratio of f1 f2 to f is reasonably configured by controlling f1 f2 and f through parameter design, so that the excessive high focal power and the excessive high refractive power of the first lens 110 and the second lens 120 can be avoided, the high-order aberration caused by peripheral beams of a lens imaging area can be favorably inhibited, and meanwhile, the chromatic aberration which is difficult to correct can be inhibited, so that the high-resolution performance of the optical system 100 is realized; when f1 f2/f is less than or equal to-10.6 mm or f1 f2/f is less than or equal to-8.0 mm, the optical power of the first lens element 110 and the second lens element 120 is too large and the refractive power is too strong, which is not favorable for suppressing the high-order aberration caused by the peripheral light beams in the imaging area of the lens, and is also easy to generate the chromatic aberration which is difficult to correct, thereby reducing the resolution performance of the optical system 100.

Further, in some embodiments, the combined focal length of the fourth lens 140 and the fifth lens 150 is f45, and the effective focal length of the optical system 100 is f, where f45 and f satisfy the following conditional expression: 1.1< f45/f < 4.1. Specifically, f45/f can be 4.027, 1.920, 1.553, 1.196, 1.125 or 1.225. In this design, the fourth lens element 140 with negative refractive power and the fifth lens element 150 with positive refractive power are matched to mutually cancel out the aberrations generated by each other, and when 1.1< f45/f <4.1, the ratio of f45 to f is reasonably configured by controlling f45 and f according to the design of parameters, thereby facilitating the correction of the aberrations of the optical system 100; when f45/f is less than or equal to 1.1, the combined focal length of the fourth lens element 140 and the fifth lens element 150 is too small, and the total refractive power of the fourth lens element 140 and the fifth lens element 150 is too strong, so that the lens assembly is prone to generate a severe astigmatism phenomenon, which is not favorable for improving the imaging quality of the optical system 100; when f45/f is greater than or equal to 4.1, the combined focal length of the fourth lens element 140 and the fifth lens element 150 is too large, so that the total refractive power of the fourth lens element 140 and the fifth lens element 150 is too small, which makes the optical system 100 prone to generate large peripheral field aberration and also generates chromatic aberration that is difficult to correct, which is not favorable for achieving high resolution performance of the optical system 100.

Further, in some embodiments, the focal length of the sixth lens 160 is f6, and the effective focal length of the optical system 100 is f, where f6 and f satisfy the following conditional expression: 1.3< f6/f < 5.6. Specifically, f6/f can be 1.478, 2.162, 2.678, 4.588, 5.565 or 5.542. In the design, the sixth lens element 160 provides positive refractive power for the optical system 100, and serves as the last lens element of the optical system 100, and can collect the light beam emitted from the front lens element, transmit the light beam to the image plane S16 smoothly, reduce the angle at which the light beam of each field enters the image plane S16, and avoid the larger curvature of field in the peripheral field, when 1.3< f6/f <5.6, the ratio of f6 to f is configured reasonably by controlling f6 and f through the design of parameters, which is favorable for correcting the chromatic aberration of the optical system 100, so as to reduce the eccentric sensitivity of the lens element to the light beam, and also favorable for correcting the aberration of the optical system 100, so as to improve the imaging resolution; when f6/f is less than or equal to 1.3 or f6/f is greater than or equal to 5.6, it is not favorable for correcting the aberration of the optical system 100, thereby reducing the imaging quality of the optical system 100.

Note that the object side surface of the lens refers to a surface of the lens facing the object side, and the image side surface of the lens refers to a surface of the lens facing the image side, for example, the object side surface S1 of the first lens 110 refers to a surface of the first lens 110 facing the (near) object side, and the image side surface S2 of the first lens 110 refers to a surface of the first lens 110 facing the (near) image side. The positive curvature radius of the object-side surface or the image-side surface of each lens on the optical axis indicates that the object-side surface or the image-side surface of the lens is convex toward the object surface, and the negative curvature radius of the object-side surface or the image-side surface of each lens on the optical axis indicates that the object-side surface or the image-side surface of the lens is convex toward the image surface.

In view of the fact that the imaging quality of the optical system 100 is closely related to the material of each lens, as well as the coordination between the lenses in the optical system 100, the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 may all be made of glass material to improve the imaging quality of the optical system 100. The material of each lens may be Plastic (Plastic), and the Plastic material may be polycarbonate, gum, or the like. In some embodiments, at least one lens of the optical system 100 is made of Glass (Glass). The lens made of plastic can reduce the production cost of the optical system 100, and the lens made of glass can endure higher or lower temperature and has excellent optical effect and better stability. In some embodiments, lenses of different materials may be disposed in the optical system 100, that is, a design combining a glass lens and a plastic lens may be adopted, but the specific configuration relationship may be determined according to practical requirements and is not exhaustive here.

The light beam emitted or reflected by the object to be photographed passes through the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 of the optical system 100 in sequence from the object side to the imaging surface S16, and is imaged on the imaging surface S16, in order to ensure the imaging sharpness of the object to be photographed on the imaging surface S16, the optical system 100 may further include an infrared filter 170, and the infrared filter 170 may be disposed between the image side surface S11 of the sixth lens and the imaging surface S16 of the optical system 100, where the infrared filter 170 includes a first surface S12 close to the object side and a second surface S13 close to the image side. Through the arrangement of the infrared filter 170, the light beam passes through the infrared filter 170 after passing through the sixth lens 160, so that the wave bands in the light beam can be effectively filtered, infrared light can also pass through under dark light, and visible light is filtered out, so that the imaging system 100 can be applied to environments with dark light or daytime, high-quality clear imaging under dark light is realized, and the imaging definition of a shot object on the imaging surface S16 is further ensured.

The light beam emitted or reflected by the object passes through the first lens 110, the second lens 120, the third lens 130, the fourth lens 140, the fifth lens 150, and the sixth lens 160 of the optical system 100 in sequence from the object side to the image plane S16, and is imaged on the image plane S16, in order to protect the imaging photosensitive element (e.g., the image sensor 210), the optical system 100 may further include a protective glass 180, and the protective glass 180 is disposed between the image side surface S11 and the image plane S16 of the sixth lens, where the protective glass 180 includes a third surface S14 close to the object side and a fourth surface S15 close to the image side. When the optical system 100 is also provided with the infrared filter 170, the infrared filter 170 is disposed on a side close to the image side surface S11 of the sixth lens element, and the protective glass 180 is correspondingly disposed between the second surface S13 of the infrared filter 170 and the image plane S16.

Based on the above description of the embodiments, more specific embodiments and drawings are set forth below for illustration.

Example one

Referring to fig. 1 to 2C, fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present disclosure, and fig. 2A to 2C respectively illustrate a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system according to the embodiment of the present disclosure.

The optical system 100 includes, in order from the object side to the image side along the optical axis, a first lens 110, a second lens 120, a third lens 130, a stop STO, a fourth lens 140, a fifth lens 150, a sixth lens 160, an infrared filter 170, a protective glass 180, and an image plane S16.

The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region thereof and a concave image-side surface S6 at a paraxial region thereof.

The fourth lens element 140 with negative refractive power has a concave object-side surface S7 at a paraxial region thereof, and a convex image-side surface S8 at the paraxial region thereof, of the fourth lens element 140.

The fifth lens element 150 with positive refractive power has a concave object-side surface S8 at a paraxial region thereof and a convex image-side surface S9 at the paraxial region thereof, and the fifth lens element 150 has a concave image-side surface S8932 at the paraxial region thereof.

The sixth lens element 160 with positive refractive power has a convex object-side surface S10 at a paraxial region thereof and a convex image-side surface S11 at the paraxial region thereof of the sixth lens element 160.

The image-side surface S8 of the fourth lens 140 and the object-side surface S8 of the fifth lens 150 are cemented together to form a cemented lens, and for example, the image-side surface S8 of the fourth lens 140 and the object-side surface S8 of the fifth lens 150 can be directly attached to each other by injection molding to form the cemented lens.

In the first embodiment, the reference wavelength of the focal length of each lens is 940.000nm, and the reference wavelengths of the abbe number and the refractive index are both 546.0740 nm. The relevant parameters of the optical system 100 are shown in table 1, wherein f in table 1 represents the effective focal length of the optical system 100, FNO represents the aperture value, and FOV represents the maximum field angle of the optical system 100, and it should be noted that the focal length, the radius of curvature, and the thickness are all in millimeters.

TABLE 1

As can be seen from table 1 above, in the first embodiment of the present application, the relationship between the focal length f1 of the first lens 110 and the effective focal length f of the optical system 100 is f1/f — 1.415, the relationship between the focal length f2 of the second lens 120 and the effective focal length f of the optical system 100 is f2/f 1.220, the relationship between the focal length f3 of the third lens 130 and the effective focal length f of the optical system 100 is f3/f 29.391, the relationship between the focal length f4 of the fourth lens 140 and the effective focal length f of the optical system 100 is f4/f — 1.848, the relationship between the focal length f5 of the fifth lens 150 and the effective focal length f of the optical system 100 is f5/f 1.451, and the relationship between the focal length f6 of the sixth lens 160 and the effective focal length f of the optical system 100 is f6/f 478.

In the first embodiment of the present application, the specific values of the parameters of the optical system 100 are substituted into the corresponding conditional expressions to obtain table 2.

TABLE 2

Fig. 2A is a graph of longitudinal spherical aberration of an optical system with wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm in the first embodiment of the present application, where the longitudinal spherical aberration curve represents the deviation of the convergent focus of light beams with different wavelengths after passing through each lens of the optical system, and the abscissa along the X-axis direction represents the focus offset amount and the ordinate along the Y-axis direction represents the normalized field angle.

As can be seen from fig. 2A, the spherical aberration corresponding to the wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm are all within 1.000mm, which indicates that the imaging quality of the optical system in the first embodiment of the present application is better.

Fig. 2B is an astigmatism graph of an optical system according to the first embodiment of the present application, where the abscissa along the X-axis represents the focus offset and the ordinate along the Y-axis represents the field angle, and the unit is deg, and the astigmatism curves include meridional field curvature and sagittal field curvature. The S curve in FIG. 2B represents sagittal field curvature at a reference wavelength of 940.000nm, and the T curve represents meridional field curvature at a reference wavelength of 940.000 nm.

When the reference wavelength is 940.000nm, as can be seen from fig. 2B, the astigmatism corresponding to the maximum field angle of the optical system 100 is controlled to be within 0.05mm, and the degree of astigmatism of the optical system 100 is well controlled.

Fig. 2C is a distortion graph of the optical system according to the first embodiment of the present application, where the distortion curve represents a distortion magnitude corresponding to different angles of view, and an abscissa along the X-axis direction represents distortion and an ordinate along the Y-axis direction represents angles of view.

In the case of the reference wavelength of 940.000nm, as can be seen from fig. 2C, the distortion corresponding to the maximum field angle of the optical system 100 is controlled to be within 20%, the degree of distortion is well controlled, and the distortion of the optical system 100 is well corrected.

Example two

Referring to fig. 3 to 4C, fig. 3 is a schematic structural diagram of an optical system according to a second embodiment of the present disclosure, and fig. 4A to 4C respectively illustrate a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system according to the second embodiment of the present disclosure.

The sixth lens element 160 with positive refractive power has a concave object-side surface S10 at a paraxial region thereof and a convex image-side surface S11 at the paraxial region thereof.

In the second example, the reference wavelength of the focal length of each lens was 940.000nm, and the reference wavelengths of the abbe number and the refractive index were 546.0740 nm. The relevant parameters of the optical system 100 are shown in table 3, wherein f in table 3 represents the effective focal length of the optical system 100, FNO represents the aperture value, and FOV represents the maximum field angle of the optical system 100, and it should be noted that the focal length, the radius of curvature, and the thickness are all in millimeters.

TABLE 3

As can be seen from table 3 above, in the second embodiment of the present application, the relationship between the focal length f1 of the first lens 110 and the effective focal length f of the optical system 100 is f1/f — 1.287, the relationship between the focal length f2 of the second lens 120 and the effective focal length f of the optical system 100 is f2/f 1.241, the relationship between the focal length f3 of the third lens 130 and the effective focal length f of the optical system 100 is f3/f 32.186, the relationship between the focal length f4 of the fourth lens 140 and the effective focal length f of the optical system 100 is f4/f — 10.026, the relationship between the focal length f5 of the fifth lens 150 and the effective focal length f of the optical system 100 is f5/f 1.680, and the relationship between the focal length f6 of the sixth lens 160 and the effective focal length f of the optical system 100 is f6/f 2.162.

In the second embodiment of the present application, the specific values of the parameters of the optical system 100 are substituted into the corresponding conditional expressions to obtain table 4.

TABLE 4

Fig. 4A is a longitudinal spherical aberration graph of an optical system with wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm in the second embodiment of the present application, where the longitudinal spherical aberration graph represents the deviation of the convergent focus of light beams with different wavelengths after passing through each lens of the optical system, and the abscissa along the X-axis direction represents the focus offset amount and the ordinate along the Y-axis direction represents the normalized field angle.

As can be seen from fig. 4A, the spherical aberration corresponding to the wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm are all within 1.000mm, which indicates that the imaging quality of the optical system in the second embodiment of the present application is better.

Fig. 4B is an astigmatism graph of the optical system in the second embodiment of the present application, where the abscissa along the X-axis represents the focus offset and the ordinate along the Y-axis represents the field angle, and the unit is deg, and the astigmatism curves include meridional field curvature and sagittal field curvature. The S curve in FIG. 4B represents sagittal field curvature at a reference wavelength of 940.000nm, and the T curve represents meridional field curvature at a reference wavelength of 940.000 nm.

When the reference wavelength is 940.000nm, as can be seen from fig. 4B, the astigmatism corresponding to the maximum field angle of the optical system 100 is controlled to be within 0.05mm, and the degree of astigmatism of the optical system 100 is well controlled.

Fig. 4C is a distortion graph of the optical system according to the second embodiment of the present application, where the distortion curve represents the magnitude of distortion corresponding to different angles of view, and the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents angles of view.

In the case of the reference wavelength of 940.000nm, as can be seen from fig. 4C, the distortion corresponding to the maximum field angle of the optical system 100 is controlled to be within 20%, the degree of distortion is well controlled, and the distortion of the optical system 100 is well corrected.

EXAMPLE III

Referring to fig. 5 to 6C, fig. 5 is a schematic structural diagram of an optical system according to a third embodiment of the present disclosure, and fig. 6A to 6C respectively illustrate a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system according to the third embodiment of the present disclosure.

The fourth lens element 140 with negative refractive power has a concave object-side surface S7 at a paraxial region thereof, and an image-side surface S8 of the fourth lens element 140 is also concave at the paraxial region thereof.

The fifth lens element 150 with positive refractive power has a convex object-side surface S8 at a paraxial region thereof and a convex image-side surface S9 at the paraxial region thereof of the fifth lens element 150.

In example three, the reference wavelength of the focal length of each lens was 940.000nm, and the reference wavelengths of the abbe number and the refractive index were 546.0740 nm. The relevant parameters of the optical system 100 are shown in table 5, wherein f in table 5 represents the effective focal length of the optical system 100, FNO represents the aperture value, and FOV represents the maximum field angle of the optical system 100, and it should be noted that the focal length, the radius of curvature, and the thickness are all in millimeters.

TABLE 5

As can be seen from table 5 above, in the third embodiment of the present application, the relationship between the focal length f1 of the first lens 110 and the effective focal length f of the optical system 100 is f1/f — 1.316, the relationship between the focal length f2 of the second lens 120 and the effective focal length f of the optical system 100 is f2/f 1.285, the relationship between the focal length f3 of the third lens 130 and the effective focal length f of the optical system 100 is f3/f 24.717, the relationship between the focal length f4 of the fourth lens 140 and the effective focal length f of the optical system 100 is f4/f — 2.333, the relationship between the focal length f5 of the fifth lens 150 and the effective focal length f of the optical system 100 is f5/f 1.006, and the relationship between the focal length f6 of the sixth lens 160 and the effective focal length f of the optical system 100 is f6/f 2.678.

In the third embodiment of the present application, the specific values of the parameters of the optical system 100 are substituted into the corresponding conditional expressions to obtain table 6.

TABLE 6

Fig. 6A is a longitudinal spherical aberration graph of an optical system with wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm in the third embodiment of the present application, where the longitudinal spherical aberration graph represents the deviation of the convergent focus of light beams with different wavelengths after passing through each lens of the optical system, and the abscissa along the X-axis direction represents the focus offset amount and the ordinate along the Y-axis direction represents the normalized field angle.

As can be seen from fig. 6A, the spherical aberration corresponding to the wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm are all within 1.000mm, which indicates that the imaging quality of the optical system in the third embodiment of the present application is better.

Fig. 6B is an astigmatism graph of the optical system in the third embodiment of the present application, where the abscissa along the X-axis represents the focus offset amount and the ordinate along the Y-axis represents the field angle, and the unit is deg, and the astigmatism curves include meridional field curvature and sagittal field curvature. The S curve in FIG. 6B represents sagittal field curvature at a reference wavelength of 940.000nm, and the T curve represents meridional field curvature at a reference wavelength of 940.000 nm.

When the reference wavelength is 940.000nm, as can be seen from fig. 6B, the astigmatism corresponding to the maximum field angle of the optical system 100 is controlled to be within 0.05mm, and the degree of astigmatism of the optical system 100 is well controlled.

Fig. 6C is a distortion graph of the optical system according to the third embodiment of the present application, where the distortion curve represents the magnitude of distortion corresponding to different angles of view, and the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents angles of view.

In the case of the reference wavelength of 940.000nm, as can be seen from fig. 6C, the distortion of the optical system 100 corresponding to the maximum field angle is controlled within 20%, the degree of distortion is well controlled, and the distortion of the optical system 100 is well corrected.

Example four

Referring to fig. 7 to 8C, fig. 7 is a schematic structural diagram of an optical system according to a fourth embodiment of the present disclosure, and fig. 8A to 8C respectively illustrate a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system according to the fourth embodiment of the present disclosure.

The sixth lens element 160 with positive refractive power has a convex object-side surface S10 at a paraxial region thereof and a concave image-side surface S11 at the paraxial region thereof.

In the fourth example, the focal length of each lens was 940.000nm, and both the Abbe number and the refractive index were 546.0740 nm. The relevant parameters of the optical system 100 are shown in table 7, wherein f in table 7 represents the effective focal length of the optical system 100, FNO represents the aperture value, and FOV represents the maximum field angle of the optical system 100, and it should be noted that the focal length, the radius of curvature, and the thickness are all in millimeters.

TABLE 7

As can be seen from table 7 above, in the fourth embodiment of the present application, the relationship between the focal length f1 of the first lens 110 and the effective focal length f of the optical system 100 is f1/f — 1.358, the relationship between the focal length f2 of the second lens 120 and the effective focal length f of the optical system 100 is f2/f 1.305, the relationship between the focal length f3 of the third lens 130 and the effective focal length f of the optical system 100 is f3/f 43.637, the relationship between the focal length f4 of the fourth lens 140 and the effective focal length f of the optical system 100 is f4/f — 1.951, the relationship between the focal length f5 of the fifth lens 150 and the effective focal length f of the optical system 100 is f5/f 0.799, and the relationship between the focal length f6 of the sixth lens 160 and the effective focal length f of the optical system 100 is f6/f 4.588.

In the fourth embodiment of the present application, the specific values of the parameters of the optical system 100 are substituted into the corresponding conditional expressions to obtain table 8.

TABLE 8

Fig. 8A is a longitudinal spherical aberration diagram of an optical system with wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm in the fourth embodiment of the present application, where the longitudinal spherical aberration diagram represents the deviation of the convergent focus of light beams with different wavelengths after passing through each lens of the optical system, and the abscissa along the X-axis direction represents the focus offset amount and the ordinate along the Y-axis direction represents the normalized field angle.

Fig. 8A shows that the spherical aberration for the wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm, and 960.0000nm are all within 1.000mm, which indicates that the imaging quality of the optical system in the fourth embodiment of the present application is better.

Fig. 8B is an astigmatism graph of the optical system in the fourth embodiment of the present application, where the abscissa in the X-axis direction represents the focus offset amount and the ordinate in the Y-axis direction represents the field angle, and the unit thereof is deg, and the astigmatism curves are meridional field curvature and sagittal field curvature. The S curve in FIG. 8B represents sagittal field curvature at a reference wavelength of 940.000nm, and the T curve represents meridional field curvature at a reference wavelength of 940.000 nm.

In the case of the reference wavelength of 940.000nm, as can be seen from fig. 8B, the astigmatism corresponding to the maximum field angle of the optical system 100 is controlled to be within 0.1mm, and the degree of astigmatism of the optical system 100 is well controlled.

Fig. 8C is a distortion graph of the optical system according to the fourth embodiment of the present application, in which a distortion curve indicates a distortion magnitude value corresponding to different angles of view, and an abscissa in the X-axis direction indicates distortion and an ordinate in the Y-axis direction indicates angles of view.

In the case of the reference wavelength of 940.000nm, as can be seen from fig. 8C, the distortion corresponding to the maximum field angle of the optical system 100 is controlled to be within 20%, the degree of distortion is well controlled, and the distortion of the optical system 100 is well corrected.

EXAMPLE five

Referring to fig. 9 to 10C, fig. 9 is a schematic structural diagram of an optical system according to a fifth embodiment of the present disclosure, and fig. 10A to 10C respectively illustrate a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical system according to the fifth embodiment of the present disclosure.

The first lens element 110 with negative refractive power has a flat object-side surface S1 at a paraxial region, and an image-side surface S2 of the first lens element 110 is concave at the paraxial region.

In the fourth example, the focal length of each lens was 940.000nm, and both the Abbe number and the refractive index were 546.0740 nm. The relevant parameters of the optical system 100 are shown in table 9, wherein f in table 9 represents the effective focal length of the optical system 100, FNO represents the aperture value, and FOV represents the maximum field angle of the optical system 100, and it should be noted that the focal length, the radius of curvature, and the thickness are all in millimeters.

TABLE 9

As can be seen from table 9 above, in the fifth embodiment of the present application, the relationship between the focal length f1 of the first lens 110 and the effective focal length f of the optical system 100 is f1/f — 1.383, the relationship between the focal length f2 of the second lens 120 and the effective focal length f of the optical system 100 is f2/f 1.327, the relationship between the focal length f3 of the third lens 130 and the effective focal length f of the optical system 100 is f3/f 123.633, the relationship between the focal length f4 of the fourth lens 140 and the effective focal length f of the optical system 100 is f4/f — 2.175, the relationship between the focal length f5 of the fifth lens 150 and the effective focal length f of the optical system 100 is f5/f 0.791, and the relationship between the focal length f6 of the sixth lens 160 and the effective focal length f of the optical system 100 is f6/f 5.565.

In the fifth embodiment of the present application, specific values of the parameters of the optical system 100 are substituted into the corresponding conditional expressions to obtain table 10.

Watch 10

Fig. 10A is a longitudinal spherical aberration graph of an optical system of 920.000nm, 930.000nm, 940.000nm, 950.000nm and 960.0000nm in the fifth embodiment of the present application, where the longitudinal spherical aberration graph represents the deviation of the convergent focus of light beams of different wavelengths after passing through each lens of the optical system, and the abscissa in the X-axis direction represents the focus offset amount and the ordinate in the Y-axis direction represents the normalized field angle.

As can be seen from fig. 10A, the spherical aberration corresponding to the wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm, and 960.0000nm are all within 1.000mm, which indicates that the imaging quality of the optical system in the fifth embodiment of the present application is better.

Fig. 10B is an astigmatism graph of the optical system in the fifth embodiment of the present application, where the abscissa in the X-axis direction represents the focus offset amount and the ordinate in the Y-axis direction represents the field angle, and the unit thereof is deg, and the astigmatism curves are meridional field curvature and sagittal field curvature. The S curve in FIG. 10B represents sagittal field curvature at a reference wavelength of 940.000nm, and the T curve represents meridional field curvature at a reference wavelength of 940.000 nm.

When the reference wavelength is 940.000nm, as can be seen from fig. 10B, astigmatism corresponding to the maximum field angle of the optical system 100 is controlled to be within 0.1mm, and the degree of astigmatism of the optical system 100 is well controlled.

Fig. 10C is a distortion graph of the optical system according to the fifth embodiment of the present application, where a distortion curve indicates a distortion magnitude value corresponding to different angles of view, and an abscissa in the X-axis direction indicates distortion and an ordinate in the Y-axis direction indicates an angle of view.

In the case where the reference wavelength is 940.000nm, as can be seen from fig. 10C, the distortion corresponding to the maximum field angle of the optical system 100 is controlled to be within 20%, the degree of distortion is well controlled, and the distortion of the optical system 100 is well corrected.

EXAMPLE six

Referring to fig. 11 to 12C, fig. 11 is a schematic structural diagram of an optical system according to a sixth embodiment of the present disclosure, and fig. 12A to 12C respectively illustrate a longitudinal spherical aberration curve, an astigmatism curve, and a distortion curve of the optical system according to the sixth embodiment of the present disclosure.

The third lens element 130 with negative refractive power has a convex object-side surface S5 at a paraxial region thereof and a concave image-side surface S6 at a paraxial region thereof of the third lens element 130.

The sixth lens element 160 with positive refractive power has a convex object-side surface S10 at a paraxial region thereof and a flat image-side surface S11 at the paraxial region thereof.

In the sixth example, the focal length of each lens was 940.000nm, and both the abbe number and the refractive index were 546.0740 nm. The relevant parameters of the optical system 100 are shown in table 11, where f in table 11 represents the effective focal length of the optical system 100, FNO represents the aperture value, and FOV represents the maximum field angle of the optical system 100, and it should be noted that the focal length, the radius of curvature, and the thickness are all in millimeters.

TABLE 11

As can be seen from table 11 above, in the sixth embodiment of the present application, the relationship between the focal length f1 of the first lens 110 and the effective focal length f of the optical system 100 is f1/f — 1.301, the relationship between the focal length f2 of the second lens 120 and the effective focal length f of the optical system 100 is f2/f 0.892, the relationship between the focal length f3 of the third lens 130 and the effective focal length f of the optical system 100 is f3/f — 10.671, the relationship between the focal length f4 of the fourth lens 140 and the effective focal length f of the optical system 100 is f4/f — 2.047, the relationship between the focal length f5 of the fifth lens 150 and the effective focal length f of the optical system 100 is f5/f 0.810, and the relationship between the focal length f6 of the sixth lens 160 and the effective focal length f of the optical system 100 is 6/f 5.542.

In the sixth embodiment of the present application, the specific values of the parameters of the optical system 100 are substituted into the corresponding conditional expressions to obtain table 12.

TABLE 12

Fig. 12A is a longitudinal spherical aberration graph of an optical system of the sixth embodiment of the present application at wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm, and 960.0000nm, the longitudinal spherical aberration graph indicating the deviation of the convergent focus of light beams of different wavelengths after passing through each lens of the optical system, wherein the abscissa in the X-axis direction indicates the focus offset amount, and the ordinate in the Y-axis direction indicates the normalized field angle.

Fig. 12A shows that the spherical aberration corresponding to the wavelengths of 920.000nm, 930.000nm, 940.000nm, 950.000nm, and 960.0000nm are all within 1.000mm, which indicates that the imaging quality of the optical system in the sixth embodiment of the present application is better.

Fig. 12B is an astigmatism graph of an optical system in a sixth embodiment of the present application, where an abscissa in the X-axis direction represents a focus offset amount and an ordinate in the Y-axis direction represents a field angle, and the astigmatism curves include meridional field curvature and sagittal field curvature, and the unit thereof is deg. The S curve in FIG. 12B represents sagittal field curvature at a reference wavelength of 940.000nm, and the T curve represents meridional field curvature at a reference wavelength of 940.000 nm.

When the reference wavelength is 940.000nm, as can be seen from fig. 12B, astigmatism corresponding to the maximum field angle of the optical system 100 is controlled to be within 0.05mm, and the degree of astigmatism of the optical system 100 is well controlled.

Fig. 12C is a distortion graph of the optical system according to the sixth embodiment of the present application, in which a distortion curve indicates a distortion magnitude value corresponding to different angles of view, and an abscissa in the X-axis direction indicates distortion and an ordinate in the Y-axis direction indicates an angle of view.

In the case where the reference wavelength is 940.000nm, as can be seen from fig. 12C, the distortion corresponding to the maximum field angle of the optical system 100 is controlled to be within 20%, the degree of distortion is well controlled, and the distortion of the optical system 100 is well corrected.

Referring to fig. 13, fig. 13 is a schematic structural diagram of an image capturing apparatus 200 according to a second aspect of the present disclosure. The image capturing device 200 includes an image sensor 210 and the optical system 100, wherein the image sensor 210 is disposed on an image side of the optical system 100, the optical system 100 is configured to receive a light beam emitted by a subject and project the light beam onto the image sensor 210, and the image sensor 210 is configured to convert an optical signal of the light beam into an image signal. The image capturing device 200 having the optical system 100 can accurately capture the state of the driver and the change of the driving environment outside the cockpit in the daytime or in the environment with dark light beams, thereby ensuring the life safety of the driver.

A third aspect of the embodiment of the application provides an electronic apparatus 300, as shown in fig. 14, the electronic apparatus 300 includes a mounting structure 310 and the image capturing device 200, and the image capturing device 200 is disposed on the mounting structure, where the mounting structure 310 is configured to carry the image capturing device 200, the mounting structure 310 may be a housing of the electronic apparatus 300 directly, or may be an intermediate connection structure that fixes the image capturing device 200 on the housing of the electronic apparatus 300, where details of a specific structure of the intermediate connection structure are not described herein, and a designer may reasonably design the intermediate connection structure according to actual needs. The electronic device 300 may be, but is not limited to, an electronic device having a camera function, such as a mobile phone, a camera, or a computer. As shown in fig. 14, the electronic apparatus 300 is an in-vehicle camera. The electronic device 300 having the optical system can accurately capture the state of the driver and the change of the driving environment outside the cockpit in the daytime or in an environment with dark light beams, thereby ensuring the life safety of the driver.

A fourth aspect of the present embodiment provides a carrier 400, as shown in fig. 15, the carrier 400 includes a connection structure (not shown in the figure) and the electronic device 300 (not shown in the figure), the electronic device 300 is disposed on the connection structure, wherein the connection structure is used for carrying the electronic device 300, the connection structure may be a housing of the carrier 400 directly, or may be an intermediate connection structure for fixing the electronic device 300 on the housing of the carrier 400, the detailed structure of the intermediate connection structure is not described herein, and a designer may design reasonably according to actual needs. The vehicle may be, but is not limited to, an automobile, an aircraft, or other vehicle-mounted equipment having an imaging function. As shown in fig. 15, the vehicle 400 is an automobile. The electronic device 300 having the optical system can accurately capture the state of the driver and the change of the driving environment outside the cockpit in the daytime or in an environment with dark light beams, thereby ensuring the life safety of the driver.

The same or similar reference numerals in the drawings of the present embodiment correspond to the same or similar components; in the description of the present application, it is to be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not intended to indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the above terms may be understood by those skilled in the art according to specific situations.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An optical system comprising, in order from an object side to an image side along an optical axis:

a first lens element with negative refractive power having a planar object-side surface and a concave image-side surface;

a second lens element with positive refractive power having a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region;

a third lens element with refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;

a sixth lens element with positive refractive power;

wherein the optical system further comprises a diaphragm disposed between an object side of the optical system and an imaging surface of the optical system;

wherein, the optical system comprises six lenses with focal power; the distance between the object side surface of the first lens element and the imaging surface of the optical system on the optical axis is TTL, the distance between the object side surface of the first lens element and the diaphragm on the optical axis is DOS, wherein the focal length of the first lens element is f1, the focal length of the second lens element is f2, and the effective focal length of the optical system is f, wherein TTL and DOS, f1, f2 and f satisfy the following conditional expressions:

2.6<TTL/DOS<3.6；

-10.6mm<f1*f2/f<-8.0mm。

2. the optical system of claim 1,

the thickness of the third lens at the optical axis is CT3, the SAGs height of the third lens at the maximum optical effective semi-aperture of the image side surface is SAGs6, wherein CT3 and SAGs6 satisfy the following conditional expression:

2.4<CT3/SAGs6<3.7。

3. the optical system of claim 1,

the curvature radius of the object side surface of the third lens at the optical axis is Rs5, the curvature radius of the image side surface of the third lens at the optical axis is Rs6, and Rs5 and Rs6 satisfy the following conditional expression:

8.0<(Rs5+Rs6)/(Rs5-Rs6)<16.0。

4. the optical system of claim 1,

the maximum angle of view of the optical system is FOV, half of the image height corresponding to the maximum angle of view of the optical system is Imgh, and FOV, f and Imgh satisfy the following conditional expression:

55.5deg<(FOV*f)/(2*Imgh)<70.5deg。

5. the optical system of claim 1,

the maximum light-passing opening diameter of the object side surface of the fourth lens is SDs8, the rise of the maximum optical effective half aperture of the object side surface of the fourth lens is SAGs8, and SDs8 and SAGs8 satisfy the following conditional expression:

11.5<SDs8/|SAGs8|<33.5。

6. the optical system of claim 1,

the thickness of the fourth lens at the optical axis is CT4, the thermal expansion coefficient of the fourth lens under the condition of-30 ℃ to 70 ℃ is alpha 4, the thickness of the fifth lens at the optical axis is CT5, the thermal expansion coefficient of the fifth lens under the condition of-30 ℃ to 70 ℃ is alpha 5, wherein CT4, alpha 4, CT5 and alpha 5 satisfy the following conditional expression:

-3.0mm*10^-6/℃<(CT5-CT4)*(α5-α4)<0.0mm*10^-6/℃。

7. the optical system of claim 1,

the combined focal length of the fourth lens and the fifth lens is f45, wherein f45 and f satisfy the following conditional expression:

1.1<f45/f<4.1。

8. the optical system of claim 1,

the focal length of the sixth lens is f6, wherein f6 and f satisfy the following conditional expression:

1.3<f6/f<5.6。

9. an image capturing apparatus, comprising:

the optical system of any one of claims 1-8; and

an image sensor disposed on an image side of the optical system.

10. An electronic device, comprising:

a mounting structure; and

the image capturing device as claimed in claim 9, wherein the image capturing device is disposed on the mounting structure.

11. A carrier, comprising:

a connecting structure; and

the electronic device of claim 10 disposed on the connecting structure.