CN113433662B - Imaging system, lens module, electronic equipment and carrier - Google Patents
Imaging system, lens module, electronic equipment and carrier Download PDFInfo
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- CN113433662B CN113433662B CN202110742926.8A CN202110742926A CN113433662B CN 113433662 B CN113433662 B CN 113433662B CN 202110742926 A CN202110742926 A CN 202110742926A CN 113433662 B CN113433662 B CN 113433662B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
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Abstract
The embodiment of the application discloses an imaging system, a lens module, electronic equipment and a carrier. The imaging system sequentially comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element along an optical axis from an object side to an image side, wherein the first lens element has negative refractive power, the second lens element has negative refractive power, the third lens element has positive refractive power, both an object side surface and an image side surface of the third lens element are convex at a paraxial region, the fourth lens element has negative refractive power, both the object side surface and the image side surface of the fourth lens element are concave at the paraxial region, the fifth lens element has positive refractive power, the sixth lens element has positive refractive power, both the object side surface and the image side surface of the sixth lens element are convex at the paraxial region, and the imaging system satisfies the following conditional expressions: 19.5mm < f1 f2/f <24mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the effective focal length of the imaging system. And the imaging quality can be improved on the premise of ensuring miniaturization and thinning.
Description
Technical Field
The present application relates to the field of optical imaging, and in particular, to an imaging system, a lens module, an electronic device, and a carrier.
Background
With the development of the vehicle-mounted industry, the technical requirements of vehicle-mounted cameras such as ADAS, automobile data recorders and back-up images are higher and higher, however, the existing vehicle-mounted camera is difficult to have both miniaturization and good imaging quality.
Disclosure of Invention
The embodiment of the application provides an imaging system, a lens module, electronic equipment and a carrier, which can improve imaging quality on the premise of ensuring miniaturization and thinning. The technical scheme is as follows:
in a first aspect, an embodiment of the present application provides an imaging system, where the imaging system includes, in order from an object side to an image side along an optical axis, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, the first lens element has negative refractive power, the second lens element has negative refractive power, the third lens element has positive refractive power, an object-side surface and an image-side surface of the third lens element, which are closer to the optical axis, are both convex surfaces, the fourth lens element has negative refractive power, an object-side surface and an image-side surface of the fourth lens element, which are closer to the optical axis, are both concave surfaces, the fifth lens element has positive refractive power, the sixth lens element has positive refractive power, and the object-side surface and the image-side surface of the sixth lens element, which are closer to the optical axis, are both convex surfaces, where the imaging system satisfies the following conditional expressions: mm19.5< f1 f2/f <24mm, where f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the effective focal length of the imaging system.
In the imaging system of the embodiment of the application, the first lens and the second lens provide negative refractive power for the imaging system, so that light rays emitted into the system at a large angle can be captured, and the field angle range of the imaging system is enlarged; the third lens provides positive refractive power for the imaging system, so that the deflection of the light direction is facilitated, large-angle light is refracted by the third lens and then converged and emitted, and the object side surface and the image side surface of the third lens are convex surfaces, so that the light can be converged in one step; the fourth lens provides negative refractive power for the imaging system, and the object side surface and the image side surface of the fourth lens are both concave surfaces, so that the light rays converged by the third lens can be widened, the edge aberration can be corrected, and the imaging resolution can be improved; the fifth lens element provides positive refractive power for the imaging system, and has a dominant effect on balancing the chromatic aberration generated by the fourth lens element. The structure that the fourth lens and the fifth lens are glued is beneficial to eliminating aberration and correcting astigmatism generated by the refraction and the rotation of light rays through the front lens group, the image side surface of the fifth lens is a convex surface, the balance of phase difference is facilitated, and the total length of the system is controlled. The sixth lens element provides positive refractive power for the system, which is beneficial to correcting the incident angle of the chief ray on the imaging surface and improving the relative illumination. Through the reasonable design of the refractive power and the surface type of the first lens to the sixth lens, the imaging quality of the imaging system is improved on the premise of ensuring miniaturization and thinning. The imaging system which meets the ratio range of 19.5mm < f1 f2/f <24mm can not only enlarge the field angle range of the imaging system, but also ensure the high-resolution imaging characteristic of the imaging system, when f1 f2/f is more than or equal to 24mm, the refractive power of the first lens and the second lens is insufficient, large-angle light rays are difficult to enter the imaging system, and the field angle range of the imaging system is not favorably enlarged; when f1 × f2/f is less than or equal to 19.5mm, the refractive power of the first lens element and the second lens element is too strong, which tends to generate strong astigmatism and chromatic aberration, which is not favorable for high-resolution imaging characteristics.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
120°<FOV<130°
wherein the FOV is a maximum field angle of the imaging system.
Based on the embodiment, the maximum field angle of the imaging system is reasonably limited, so that the light transmission amount of the imaging system can be reasonably controlled, the field angle of the imaging system is favorably increased, and the requirement of wide angle is met.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
7<f45/f<10.1
wherein f45 is the combined focal length of the fourth lens and the fifth lens.
Based on the above embodiment, the imaging system satisfying the ratio range of 7< f45/f <10.1 has the characteristics of good resolution performance and high imaging quality. When f45/f is larger than or equal to 10.1, the overall refractive power of the fourth lens element and the fifth lens element is too small, which is likely to generate larger edge aberration and chromatic aberration, and is not beneficial to improving the resolution performance; when f45/f is less than or equal to 7, the total refractive power of the fourth lens element and the fifth lens element is too strong, which tends to generate a severe astigmatism, and is not favorable for improving the imaging quality.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
1.6<f3/CT3<5.6
wherein f3 is the focal length of the third lens element, and CT3 is the thickness of the third lens element on the optical axis.
Based on the above embodiment, when f3/CT3 is greater than or equal to 5.6, and the focal length of the third lens element is too large, the refractive power is insufficient, which is not favorable for suppressing high-order aberration, so that phenomena such as high-order spherical aberration and coma aberration occur to affect the resolution and imaging quality of the imaging system; when f3/CT3 is less than or equal to 1.6, and the refractive power of the third lens element is too strong, the width of the light beam is rapidly contracted, so that the incident angle of the light beam incident on the rear lens element is increased, and the burden borne by the rear lens element for reducing the light angle of the light beam emergent imaging system is increased.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
1<(Rs3+Rs4)/(Rs3-Rs4)<4
wherein Rs3 is the radius of curvature of the object-side surface of the second lens, and Rs4 is the radius of curvature of the image-side surface of the second lens.
Based on the above embodiment, the curvature radius of the second lens affects the curvature degree of the second lens, and by reasonably designing the curvature radius of the object-side surface and the curvature radius of the image-side surface of the second lens, the peripheral aberration of the imaging system can be corrected, the generation of astigmatism can be suppressed, and the angle of the principal ray incident on the image plane at the peripheral angle of view can be reduced. When the ratio of (Rs3+ Rs4)/(Rs3-Rs4) is less than or equal to 1 or (Rs3+ Rs4)/(Rs3-Rs4) is more than or equal to 4, the correction of the imaging system aberration is not facilitated.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
-3.2mm*10 -6 /℃<(CT5-CT4)*(a5-a4)<-1mm*10 -6 /℃
wherein CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fourth lens on the optical axis, a4 is the thermal expansion coefficient of the fourth lens at-30 ℃ -70 ℃, and a5 is the thermal expansion coefficient of the fifth lens at-30 ℃ -70 ℃.
Based on the embodiment, the influence of temperature on the lens is reduced by reasonably matching materials of the fourth lens and the fifth lens, so that the lens keeps good imaging quality under high-temperature or low-temperature conditions, the thickness difference and the material characteristic difference of the fourth lens and the fifth lens are reduced, the cracking risk of the cemented lens is further reduced, and the lens still has better resolving power under high-temperature and low-temperature conditions.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
3<CT6/|Sags12|<5
the CT6 is the thickness of the sixth lens element on the optical axis, and the Sags12 is the distance from the maximum clear aperture of the image-side surface of the sixth lens element to the intersection point of the image-side surface of the sixth lens element and the optical axis along the direction parallel to the optical axis.
Based on the embodiment, the ratio relation between the thickness of the sixth lens and the rise value of the image side surface of the sixth lens is controlled, so that the problem that the manufacturing difficulty of the lens is increased due to overlarge central thickness of the sixth lens or the excessively bent image side surface is avoided, and the production cost is reduced. When the CT6/| Sags12| is less than or equal to 3, the image side face of the sixth lens is too curved, the processing difficulty of the lens is increased, the production cost of the lens is increased, and meanwhile, the surface is too curved, edge aberration is easy to generate, and the improvement of the image quality of an imaging system is not facilitated; when the CT6/| Sags12| ≧ 5, the thickness of the sixth lens is too large, which is disadvantageous for the light weight and miniaturization of the imaging system.
In some of these embodiments, the imaging system further comprises a diaphragm, and the imaging system further satisfies the following conditional expression:
2.5<TTL/DOS<3.1
wherein, TTL is a distance from the object-side surface of the first lens element to the imaging surface of the imaging system on the optical axis, and DOS is a distance from the object-side surface of the first lens element to the diaphragm on the optical axis.
Based on the above embodiment, the distance from the object-side surface of the first lens to the imaging surface on the optical axis and the distance from the object-side surface of the first lens to the diaphragm on the optical axis are reasonably designed, so that the compact and miniaturized imaging system is facilitated. When TTL/DOS is less than or equal to 2.5, the large-angle light beams are difficult to enter the imaging system, the object space imaging range of the imaging system is reduced, and the wide angle is not easy to realize; when TTL/DOS is more than or equal to 3.1, the optical total length of the imaging system is too long, which is not beneficial to the miniaturization of the imaging system.
In some of these embodiments, the imaging system further satisfies the following conditional expression:
3.5<2*Imgh/EPD<4.1
wherein Imgh is half of the image height corresponding to the maximum field angle of the imaging system, and EPD is the entrance pupil diameter of the imaging system.
Based on the embodiment, the imaging system can meet the requirements of large image plane and high-quality imaging by reasonably limiting the half of the image height corresponding to the maximum field angle of the imaging system and the entrance pupil diameter of the imaging system, and the entrance pupil diameter of the imaging system is controlled at the same time, so that the large-image plane ultra-wide-angle imaging system can meet the requirement of sufficient image plane brightness of the marginal field of view. When 2 × Imgh/EPD is larger than or equal to 4.1, the entrance pupil diameter is smaller, which is not beneficial to the large-aperture imaging system and the improvement of the image surface brightness of the imaging system; when 2 × Imgh/EPD is less than or equal to 3.5, the entrance pupil diameter is large, astigmatism of the peripheral field-of-view ray bundle is increased, which is not beneficial to improvement of imaging quality of the imaging system, enables the image surface to be curved, enhances astigmatism, and is not beneficial to improvement of resolution of the imaging system.
In a second aspect, an embodiment of the present application provides a lens module, including:
the imaging system of the above embodiment;
the photosensitive element is arranged on the image side of the imaging system.
Based on the lens module in this application embodiment, have above-mentioned imaging system, when guaranteeing the miniaturization of lens module and slimming, can also improve the image quality of lens module.
In a third aspect, an embodiment of the present application provides an electronic device, including the lens module in the foregoing embodiment.
Based on this application embodiment in electronic equipment, have above-mentioned lens module, when guaranteeing that electronic equipment is miniaturized and slim, can also improve electronic equipment's image quality.
In a fourth aspect, an embodiment of the present application provides a carrier including the electronic device according to the foregoing embodiment.
According to the carrier in the embodiment of the application, the imaging quality is good.
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 for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an imaging system provided in an embodiment of the present application;
fig. 2 is a longitudinal spherical aberration graph, an astigmatism graph, and a distortion graph of an imaging system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of an imaging system provided in the second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of the imaging system provided in the second embodiment of the present application;
fig. 5 is a schematic structural diagram of an imaging system provided in the third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of an imaging system provided in the third embodiment of the present application;
fig. 7 is a schematic structural diagram of an imaging system provided in the fourth embodiment of the present application;
FIG. 8 is a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of an imaging system according to a fourth embodiment of the present application
Fig. 9 is a schematic structural diagram of an imaging system provided in the fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of an imaging system provided in the fifth embodiment of the present application;
fig. 11 is a schematic structural diagram of an imaging system provided in the fifth embodiment of the present application;
fig. 12 is a longitudinal spherical aberration graph, an astigmatism graph and a distortion graph of an imaging system provided in the fifth embodiment of the present application;
fig. 13 is a schematic view of a carrier according to an embodiment of the present disclosure.
Reference numerals: 101. a carrier; 1. an electronic device; 10. a lens module; 100. an imaging system; 110. a first lens; 120. a second lens; 130. a third lens; 140. a fourth lens; 150. a fifth lens; 160. a sixth lens; 170. an optical filter; 180. and (4) protecting the glass.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the application, as detailed in the appended claims.
In a first aspect, an embodiment of the present application provides an imaging system 100, which can improve imaging quality on the premise of ensuring miniaturization and thinning. Referring to fig. 1 to 12, the imaging system 100 includes, in order from an object side to an image side along an optical axis, 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.
Specifically, the first lens element 110 with negative refractive power has a convex object-side surface of the first lens element 110 and a concave image-side surface of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface of the second lens element 120 and a concave image-side surface of the second lens element 120. The third lens element 130 with positive refractive power has a convex object-side surface at a paraxial region of the third lens element 130 and a convex image-side surface at a paraxial region of the third lens element 130. The fourth lens element 140 with negative refractive power has a concave object-side surface at a paraxial region of the fourth lens element 140, and has a concave image-side surface at a paraxial region of the fourth lens element 140. The fifth lens element 150 with positive refractive power has a convex object-side surface at a paraxial region of the fifth lens element 150 and a convex image-side surface at a paraxial region of the fifth lens element 150. And the fourth lens 140 and the fifth lens 150 are cemented. The sixth lens element 160 with positive refractive power has a convex object-side surface at a paraxial region of the sixth lens element 160 and a convex image-side surface at a paraxial region of the sixth lens element 160; wherein the imaging system 100 satisfies the following conditional expressions: 19.5mm < f1 f2/f <24mm, where f1 is the focal length of the first lens 110, f2 is the focal length of the second lens 120, and f is the effective focal length of the imaging system 100.
In the imaging system 100 of the embodiment of the application, the first lens element 110 and the second lens element 120 provide negative refractive power for the imaging system 100, so that light rays entering the system at a large angle can be captured, and the field angle range of the imaging system 100 is expanded; the third lens element 130 provides positive refractive power for the imaging system 100, which is beneficial to deflecting the light direction, so that the light with large angle is refracted by the third lens element 130 and then converged and incident, and the object-side surface and the image-side surface of the third lens element 130 are convex surfaces, so that the light can be converged in one step; the fourth lens element 140 provides negative refractive power for the imaging system 100, and both the object-side surface and the image-side surface of the fourth lens element 140 are concave, which is beneficial to widening the light rays converged by the third lens element 130, correcting the edge aberration, and improving the imaging resolution; the fifth lens element 150 provides positive refractive power to the imaging system 100, mainly for balancing the chromatic aberration generated by the fourth lens element 140. The structure of the fourth lens 140 and the fifth lens 150 is favorable for eliminating aberration and correcting astigmatism generated by the refraction and rotation of light rays through the front lens group, and the image side surface of the fifth lens 150 is a convex surface, so that the phase difference is favorably balanced and the total length of the system is favorably controlled. The sixth lens element 160 provides positive refractive power to the system, which is beneficial to correcting the incident angle of the chief ray incident on the image plane and improving the relative illumination. In addition, the imaging quality of the imaging system 100 is improved by reasonably designing the refractive powers and the surface shapes of the first lens element 110 to the sixth lens element 160 on the premise of ensuring miniaturization and thinning. The imaging system 100 satisfying the ratio range of 19.5mm < f1 f2/f <24mm can not only enlarge the field angle range of the imaging system 100, but also ensure the high-resolution imaging characteristic of the imaging system 100, when f1 f2/f is not less than 24mm, the refractive power of the first lens 110 and the second lens 120 is insufficient, so that large-angle light rays are difficult to enter the imaging system 100, and the enlargement of the field angle range of the imaging system 100 is not facilitated; when f1 × f2/f is less than or equal to 19.5mm, the refractive power of the first lens element 110 and the second lens element 120 is too strong, which tends to generate strong astigmatism and chromatic aberration, which is not favorable for high-resolution imaging characteristics.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: 120 ° < FOV <130 °, where FOV is the maximum field angle of the imaging system 100. By reasonably limiting the maximum field angle of the imaging system 100, the light flux of the imaging system 100 can be reasonably controlled, which is beneficial to increasing the field angle of the imaging system 100 and meeting the requirement of wide angle.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: 7< f45/f <10.1, where f45 is the combined focal length of the fourth lens 140 and the fifth lens 150. The imaging system 100 can satisfy the range of the ratio of 7< f45/f <10.1, and has the characteristics of good resolution performance and high imaging quality. When f45/f is greater than or equal to 10.1, the total refractive power of the fourth lens element 140 and the fifth lens element 150 is too small, which is likely to generate larger edge aberration and chromatic aberration, and is not favorable for improving the resolution performance; when f45/f is less than or equal to 7, the total refractive power of the fourth lens element 140 and the fifth lens element 150 is too strong, which is likely to generate a severe astigmatism, and is not favorable for improving the imaging quality.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: 1.6< f3/CT3<5.6, wherein f3 is the focal length of the third lens 130, and CT3 is the thickness of the third lens 130 on the optical axis. When f3/CT3 is greater than or equal to 5.6, the focal length of the third lens element 130 is too large, the refractive power is insufficient, and the high-order aberration is not favorably inhibited, so that the high-order spherical aberration, coma aberration and other phenomena affect the resolution and the imaging quality of the imaging system 100; when f3/CT3 is less than or equal to 1.6, the refractive power of the third lens element 130 is too strong, which causes the width of the light beam to shrink rapidly, thereby increasing the incident angle of the light beam entering the rear lens element and increasing the burden on the rear lens element to reduce the light angle of the light beam exiting the imaging system 100.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: 1< (Rs3+ Rs4)/(Rs3-Rs4) <4, wherein Rs3 is the radius of curvature of the object-side surface of the second lens 120 and Rs4 is the radius of curvature of the image-side surface of the second lens 120. The curvature radius of the second lens 120 affects the curvature degree of the second lens 120, and through reasonable design of the curvature radius of the object-side surface of the second lens 120 and the curvature radius of the image-side surface of the second lens 120, the marginal aberration of the imaging system 100 can be corrected, the generation of astigmatism is suppressed, and the angle of the principal ray incident on the image plane at the peripheral view angle is reduced. When the ratio of (Rs3+ Rs4)/(Rs3-Rs4) is less than or equal to 1 or (Rs3+ Rs4)/(Rs3-Rs4) is more than or equal to 4, the correction of the aberration of the imaging system 100 is not facilitated.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: -3.2mm 10 -6 /℃<(CT5-CT4)*(a5-a4)<-1mm*10 -6 Where CT4 is the thickness of the fourth lens 140 on the optical axis, CT5 is the thickness of the fourth lens 140 on the optical axis, a4 is the thermal expansion coefficient of the fourth lens 140 at-30 ℃ to 70 ℃, and a5 is the thermal expansion coefficient of the fifth lens 150 at-30 ℃ to 70 ℃. The influence of temperature on the lens is reduced by reasonably matching the materials of the fourth lens 140 and the fifth lens 150, so that the lens keeps good imaging quality under the condition of high temperature or low temperature, the central thickness difference and the material characteristic difference of the fourth lens 140 and the fifth lens 150 are reduced, the cracking risk of the cemented lens is further reduced, and the lens still has better resolving power under the condition of high temperature and low temperature.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: 3< CT6/| Sags12| <5, where CT6 is the thickness of the sixth lens 160 on the optical axis, and Sags12 is the distance from the maximum clear aperture of the image side surface of the sixth lens 160 to the intersection point of the image side surface and the optical axis of the sixth lens 160 along the direction parallel to the optical axis. By controlling the ratio of the center thickness of the sixth lens element 160 to the image-side surface rise value of the sixth lens element 160, the difficulty in manufacturing the lens element due to the excessive center thickness or the excessive curvature of the image-side surface of the sixth lens element 160 is avoided, thereby reducing the production cost. When the CT6/| Sags12| is less than or equal to 3, the image side surface of the sixth lens 160 is too curved, the processing difficulty of the lens is increased, the production cost of the lens is increased, and meanwhile, the surface is too curved, so that edge aberration is easily generated, which is not favorable for improving the image quality of the imaging system 100; when the CT6/| Sags12| ≧ 5, the thickness of the sixth lens 160 is too large, which is disadvantageous for the weight reduction and miniaturization of the imaging system 100.
In some embodiments, to reduce stray light and improve the imaging effect, the imaging system 100 further includes a diaphragm, and the imaging system 100 further satisfies the following conditional expression: 2.5< TTL/DOS <3.1, wherein TTL is the distance on the optical axis from the object-side surface of the first lens element 110 to the image plane, and DOS is the distance on the optical axis from the object-side surface of the first lens element 110 to the stop. The distance between the object-side surface S1 of the first lens element 110 and the image plane S17 on the optical axis and the distance between the object-side surface S1 of the first lens element 110 and the stop STO on the optical axis are reasonably designed, which is beneficial to the compact structure and miniaturization of the imaging system 100. When TTL/DOS is less than or equal to 2.5, the large-angle light beams are difficult to enter the imaging system 100, the object space imaging range of the imaging system 100 is reduced, and the wide angle is not easy to realize; when TTL/DOS is greater than or equal to 3.1, the distance from the object-side surface S1 of the first lens element 110 to the image plane S17 of the imaging system 100 on the optical axis, i.e., the total optical length of the imaging system 100 is too long, which is not favorable for the miniaturization of the imaging system 100.
Specifically, the stop STO may be an aperture stop STO and/or a field stop STO. The stop STO may be located between any two adjacent lenses before the object-side surface S1 and the image plane S17 of the first lens 110. For example, stop STO can be located: the image-side surface S1 of the first lens element 110, the image-side surface S2 of the first lens element 110 and the object-side surface S3 of the second lens element 120, the image-side surface S4 of the second lens element 120 and the object-side surface S5 of the third lens element 130, the image-side surface S6 of the third lens element 130 and the object-side surface S7 of the fourth lens element 140, the image-side surface S8 of the fourth lens element 140 and the object-side surface S9 of the fifth lens element 150, the image-side surface S10 of the fifth lens element 150 and the object-side surface S11 of the sixth lens element 160, and the image-side surface S12 and the image-forming surface S17 of the sixth lens element 160. In order to reduce the manufacturing cost, the stop STO may be provided on any one of the object-side surface S1 of the first lens 110, the object-side surface S3 of the second lens 120, the object-side surface S5 of the third lens 130, the object-side surface S7 of the fourth lens 140, the object-side surface S9 of the fifth lens 150, the object-side surface S11 of the sixth lens 160, the image-side surface S2 of the first lens 110, the image-side surface S4 of the second lens 120, the image-side surface S6 of the third lens 130, the image-side surface S7 of the fourth lens 140, the image-side surface S10 of the fifth lens 150, and the image-side surface S12 of the sixth lens 160. Preferably, the stop STO may be located between the image-side surface S6 of the third lens 130 and the object-side surface S7 of the fourth lens 140.
To achieve filtering of the non-operating bands, the imaging system 100 may also include a filter 170. Preferably, the filter 170 may be located between the image side surface S10 of the sixth lens 160 and the imaging surface S17 of the imaging system 100. The filter 170 may be used to filter the infrared light and prevent the infrared light from reaching the imaging surface S17 of the imaging system 100, so as to prevent the infrared light from interfering with normal imaging. The filter 170 may be assembled with each lens as part of the imaging system 100. In other embodiments, the filter 170 does not belong to the imaging system 100, and the filter 170 may be installed between the imaging system 100 and the photosensitive element when the imaging system 100 and the photosensitive element are assembled into the lens module 10. In some embodiments, the filter 170 may also be disposed on the object side S1 of the first lens 110. In addition, in some embodiments, the function of filtering infrared light can also be achieved by disposing a filter coating on at least one of the first lens 110 to the sixth lens 160.
In order to protect the photosensitive elements of the image forming surface S17 from dust, a protective glass 180 is further provided between the sixth lens 160 and the image forming surface S17.
The first lens element 110 to the sixth lens element 160 may be made of plastic or glass. In some embodiments, the material of at least one lens in the imaging system 100 may be Plastic (PC), and the Plastic material may be polycarbonate, gum, etc. In some embodiments, at least one lens of the imaging system 100 may be made of Glass (GL). The lens made of plastic material can reduce the production cost of the imaging system 100, and the lens made of glass material 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 imaging 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.
In some embodiments, at least one lens of imaging system 100 has an aspheric surface profile, which may be referred to as having an aspheric surface profile when at least one side surface (object side or image side) of the lens is aspheric. In one embodiment, both the object-side surface and the image-side surface of each lens can be designed to be aspheric. The aspheric design can help the imaging system 100 to eliminate aberration more effectively and improve imaging quality. In some embodiments, at least one lens in the imaging system 100 may also have a spherical surface shape, and the design of the spherical surface shape may reduce the difficulty and cost of manufacturing the lens. In some embodiments, in order to take into account the manufacturing cost, the manufacturing difficulty, the imaging quality, the assembly difficulty, and the like, the design of each lens surface in the imaging system 100 may be configured by aspheric and spherical surface types.
In some of these embodiments, the imaging system 100 further satisfies the following conditional expressions: 3.5<2 × Imgh/EPD <4.1, where Imgh is half the image height corresponding to the maximum field angle of the imaging system 100 and EPD is the entrance pupil diameter of the imaging system 100. By reasonably limiting the half of the image height corresponding to the maximum field angle of the imaging system 100 and the entrance pupil diameter of the imaging system 100, the imaging system 100 can meet the requirements of large image plane and high-quality imaging, and simultaneously, the entrance pupil diameter of the imaging system 100 is controlled, so that the large-image plane ultra-wide angle imaging system 100 can meet the requirement of sufficient image plane brightness of the marginal field of view. When 2 × Imgh/EPD is greater than or equal to 4.1, the entrance pupil diameter is small, which is not beneficial to the large-aperture imaging system 100 and the improvement of the image surface brightness of the imaging system 100; when 2 × Imgh/EPD is less than or equal to 3.5, the entrance pupil diameter is large, and astigmatism of the peripheral field-of-view ray bundle is increased, which is not favorable for improving the imaging quality of the imaging system 100, enhancing the image surface curvature and astigmatism, and not favorable for improving the resolution of the imaging system 100.
Referring to fig. 13, in a second aspect, an embodiment of the present application provides a lens module 10, including: the above-described embodiment of the imaging system 100 and the photosensitive element (not shown in the figure) disposed on the image side of the imaging system 100.
Based on the lens module 10 in the embodiment of the present application, with the imaging system 100, the miniaturization and thinning of the lens module 10 are ensured, and the imaging quality of the lens module 10 can also be improved.
Referring to fig. 13, in a third aspect, an embodiment of the present application provides an electronic device 1 including the lens module 10 of the foregoing embodiment.
Based on the electronic device 1 in the embodiment of the present application, with the lens module 10, the imaging quality of the electronic device 1 can be improved while the electronic device 1 is ensured to be miniaturized and thinned.
Referring to fig. 13, in a fourth aspect, an embodiment of the present application provides a carrier: 101 comprising the electronic device 1 of the above embodiment. Vehicle 40 may be a drone, an automobile, or the like.
According to the carrier 101 in the embodiment of the present application, the imaging quality is good.
Specifically, the surfaces of the lenses of the imaging system 100 may be aspheric, for which the aspheric equation for the aspheric surfaces is:
wherein Z is the distance from a corresponding point on the aspheric surface to a plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c represents the curvature of the surface at the vertex, K represents a conic constant, and A4, A6, A8, A10 and A12 represent aspheric coefficients of 4 th order, 6 th order, 8 th order, 10 th order and 12 th order, respectively.
The imaging system 100 will be described in detail below with reference to specific parameters.
Detailed description of the preferred embodiment
Referring to fig. 1, a schematic structural diagram of an imaging system 100 according to an embodiment of the present disclosure, the imaging system 100 includes 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, a filter 170, and a protective glass 180, which are sequentially disposed from an object side to an image side along an optical axis, where the filter 170 is an infrared cut filter.
The first lens element 110 with negative refractive power has a convex object-side surface S1 at a paraxial region of the first lens element 110 and a concave image-side surface S2 at the paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region of the third lens element 130 and a convex image-side surface S6 at a paraxial region of the third lens element 130. 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 concave at the paraxial region thereof. The fifth lens element 150 with positive refractive power has a convex object-side surface S9 at a paraxial region thereof and a convex image-side surface S10 at the paraxial region thereof, the fifth lens element 150. The sixth lens element 160 with positive refractive power has a convex object-side surface S11 at a paraxial region thereof and a convex image-side surface S12 at the paraxial region thereof.
In the embodiment of the present application, the focal length reference wavelength of each lens is 546.07nm, the reference wavelength of the refractive index and the abbe number is 546.07nm, the relevant parameters of the imaging system 100 are shown in table 1, f in table 1 is the focal length of the imaging system 100, FNO represents the f-number, and FOV represents the maximum field angle of the imaging system 100; the focal length, radius of curvature and thickness are all in mm.
TABLE 1
In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 2:
TABLE 2
| Noodle sequence number | 11 | 12 |
| K | -5.467E-01 | -5.636E-01 |
| A4 | -1.671E-04 | 9.795E-03 |
| A6 | 1.272E-04 | -9.473E-04 |
| A8 | -5.359E-05 | 4.225E-04 |
| A10 | 1.730E-05 | -1.033E-05 |
| A12 | -3.275E-06 | 8.470E-06 |
| A14 | 3.145E-07 | -8.221E-07 |
| A16 | -1.925E-08 | 5.559E-08 |
| A18 | 4.779E-10 | -1.272E-09 |
| A20 | -5.079E-12 | 2.909E-11 |
Fig. 2(a) is a graph of longitudinal spherical aberration of light rays with wavelengths of 656.2700nm, 587.5600nm, 546.0700nm, 486.1300nm and 435.8400nm in the embodiment of the present application, and it can be seen from fig. 2(a) that the longitudinal spherical aberration corresponding to the wavelengths of 656.2700nm, 587.5600nm, 546.0700nm, 486.1300nm and 435.8400nm are all within 0.025 mm, which indicates that the imaging quality of the embodiment of the present application is better.
Fig. 2(b) is a diagram of astigmatism of light at a wavelength of 546.0700nm of the imaging system 100 in the first embodiment. Wherein the abscissa in the X-axis direction represents the focus offset and the ordinate in the Y-axis direction represents the image height in mm. The astigmatism curves represent the meridional imaging plane curvature T and the sagittal imaging plane curvature S, and as can be seen from fig. 2(b), the astigmatism of the imaging system 100 is well compensated.
Referring to fig. 2(c), fig. 2(c) is a graph illustrating the distortion of the imaging system 100 at 546.0700nm in the first embodiment. Wherein the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents image height. As can be seen from fig. 2(c), the distortion of the imaging system 100 is well corrected at a wavelength of 546.0700 nm.
It can be seen from fig. 2(a), 2(b), and 2(c) that the aberration of the imaging system 100 in the present embodiment is small.
Detailed description of the invention
Referring to fig. 3, the imaging system 100 includes, in order from an object side to an image side along an 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 optical filter 170, and a protective glass 180. The first lens element 110 with negative refractive power has a convex object-side surface S1 at a paraxial region of the first lens element 110 and a concave image-side surface S2 at the paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region of the third lens element 130 and a convex image-side surface S6 at a paraxial region of the third lens element 130. 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 concave at the paraxial region thereof. The fifth lens element 150 with positive refractive power has a convex object-side surface S9 at a paraxial region thereof and a convex image-side surface S10 at the paraxial region thereof, the fifth lens element 150. The sixth lens element 160 with positive refractive power has a convex object-side surface S11 at a paraxial region thereof and a convex image-side surface S12 at the paraxial region thereof.
In the embodiment of the present application, the focal length reference wavelength of each lens is 546.07nm, the reference wavelength of the refractive index and the abbe number is 546.07nm, the relevant parameters of the imaging system 100 are shown in table 3, f in table 3 is the focal length of the imaging system 100, FNO represents the f-number, and FOV represents the maximum field angle of the imaging system 100; the focal length, radius of curvature and thickness are all in mm.
TABLE 3
In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 4:
TABLE 4
| Number of noodles | 11 | 12 |
| K | -9.962E-01 | -6.582E-01 |
| A4 | -8.155E-04 | 1.977E-05 |
| A6 | 7.095E-04 | -9.507E-04 |
| A8 | -5.674E-05 | 4.202E-04 |
| A10 | 1.727E-05 | -1.008E-05 |
| A12 | -3.223E-06 | 4.483E-06 |
| A14 | 3.064E-07 | -8.136E-07 |
| A16 | -1.947E-08 | 5.571E-08 |
| A18 | 4.513E-10 | -1.300E-09 |
| A20 | -5.633E-12 | 2.219E-11 |
As can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, curvature of field, and distortion of the imaging system 100 are well controlled, so that the imaging system 100 of this embodiment has good imaging quality.
Detailed description of the preferred embodiment
Referring to fig. 5, the imaging system 100 includes, in order from an object side to an image side along an 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 optical filter 170, and a protective glass 180. The first lens element 110 with negative refractive power has a convex object-side surface S1 at a paraxial region of the first lens element 110 and a concave image-side surface S2 at the paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region of the third lens element 130 and a convex image-side surface S6 at a paraxial region of the third lens element 130. 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 concave at the paraxial region thereof. The fifth lens element 150 with positive refractive power has a convex object-side surface S9 at a paraxial region thereof and a convex image-side surface S10 at the paraxial region thereof, the fifth lens element 150. The sixth lens element 160 with positive refractive power has a convex object-side surface S11 at a paraxial region thereof and a convex image-side surface S12 at the paraxial region thereof.
In the embodiment of the present application, the focal length reference wavelength of each lens is 546.07nm, the reference wavelength of the refractive index and the abbe number is 546.07nm, the relevant parameters of the imaging system 100 are shown in table 5, f in table 5 is the focal length of the imaging system 100, FNO represents the f-number, and FOV represents the maximum field angle of the imaging system 100; the focal length, radius of curvature and thickness are all in mm.
TABLE 5
In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 6:
TABLE 6
| Number of noodles | 11 | 12 |
| K | -6.752E-02 | -9.396E-01 |
| A4 | -1.198E-04 | 2.315E-03 |
| A6 | 3.925E-04 | -3.481E-04 |
| A8 | -6.841E-05 | 4.027E-04 |
| A10 | 1.852E-05 | -9.295E-06 |
| A12 | -3.442E-06 | 8.450E-06 |
| A14 | 3.072E-07 | -8.290E-07 |
| A16 | -1.973E-08 | 5.565E-08 |
| A18 | 4.395E-10 | -1.331E-09 |
| A20 | -5.533E-12 | 2.285E-11 |
As can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, curvature of field, and distortion of the imaging system 100 are well controlled, so that the imaging system 100 of this embodiment has good imaging quality.
Detailed description of the invention
Referring to fig. 7, the imaging system 100 includes, in order from an object side to an image side along an 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 optical filter 170, and a protective glass 180. The first lens element 110 with negative refractive power has a convex object-side surface S1 at a paraxial region of the first lens element 110 and a concave image-side surface S2 at the paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region of the third lens element 130 and a convex image-side surface S6 at a paraxial region of the third lens element 130. 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 concave at the paraxial region thereof. The fifth lens element 150 with positive refractive power has a convex object-side surface S9 at a paraxial region thereof and a convex image-side surface S10 at the paraxial region thereof, the fifth lens element 150. The sixth lens element 160 with positive refractive power has a convex object-side surface S11 at a paraxial region thereof and a convex image-side surface S12 at the paraxial region thereof.
In the embodiment of the present application, the focal length reference wavelength of each lens is 546.07nm, the reference wavelength of the refractive index and the abbe number is 546.07nm, the relevant parameters of the imaging system 100 are shown in table 7, f in table 7 is the focal length of the imaging system 100, FNO represents the f-number, and FOV represents the maximum field angle of the imaging system 100; the focal length, radius of curvature and thickness are all in mm.
TABLE 7
In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 8:
TABLE 8
As can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, curvature of field, and distortion of the imaging system 100 are well controlled, so that the imaging system 100 of this embodiment has good imaging quality.
Detailed description of the preferred embodiment
Referring to fig. 9, a schematic structural diagram of an imaging system 100 according to an embodiment of the present application includes, in order from an object side to an image side along an 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 optical filter 170, and a protective glass 180. The first lens element 110 with negative refractive power has a convex object-side surface S1 at a paraxial region of the first lens element 110 and a concave image-side surface S2 at the paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region of the third lens element 130 and a convex image-side surface S6 at a paraxial region of the third lens element 130. 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 concave at the paraxial region thereof. The fifth lens element 150 with positive refractive power has a convex object-side surface S9 at a paraxial region thereof and a convex image-side surface S10 at the paraxial region thereof, the fifth lens element 150. The sixth lens element 160 with positive refractive power has a convex object-side surface S11 at a paraxial region thereof and a convex image-side surface S12 at the paraxial region thereof.
In the embodiment of the present application, the focal length reference wavelength of each lens is 546.07nm, the reference wavelength of the refractive index and the abbe number is 546.07nm, the relevant parameters of the imaging system 100 are shown in table 9, f in table 9 is the focal length of the imaging system 100, FNO represents the f-number, and FOV represents the maximum field angle of the imaging system 100; the focal length, radius of curvature and thickness are all in mm.
TABLE 9
In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 10:
watch 10
| Number of noodles | 11 | 12 |
| K | -1.187E+00 | -2.291E-01 |
| A4 | -7.389E-04 | 7.786E-03 |
| A6 | -6.761E-06 | -4.826E-04 |
| A8 | 5.667E-06 | 6.139E-05 |
| A10 | -4.834E-07 | -2.279E-06 |
| A12 | 1.116E-08 | 1.422E-07 |
| A14 | -3.748E-10 | -8.051E-09 |
| A16 | 8.608E-12 | 1.906E-10 |
| A18 | 0.000E+00 | 0.000E+00 |
| A20 | 0.000E+00 | 0.000E+00 |
As can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, curvature of field, and distortion of the imaging system 100 are well controlled, so that the imaging system 100 of this embodiment has good imaging quality.
Detailed description of the preferred embodiment
Referring to fig. 11, the imaging system 100 includes, in order from an object side to an image side along an 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 optical filter 170, and a protective glass 180. The first lens element 110 with negative refractive power has a convex object-side surface S1 at a paraxial region of the first lens element 110 and a concave image-side surface S2 at the paraxial region of the first lens element 110. The second lens element 120 with negative refractive power has a convex object-side surface S3 at a paraxial region thereof and a concave image-side surface S4 at the paraxial region thereof, and the second lens element 120 is disposed on the object-side surface S3. The third lens element 130 with positive refractive power has a convex object-side surface S5 at a paraxial region of the third lens element 130 and a convex image-side surface S6 at a paraxial region of the third lens element 130. 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 concave at the paraxial region thereof. The fifth lens element 150 with positive refractive power has a convex object-side surface S9 at a paraxial region thereof and a convex image-side surface S10 at the paraxial region thereof, the fifth lens element 150. The sixth lens element 160 with positive refractive power has a convex object-side surface S11 at a paraxial region thereof and a convex image-side surface S12 at the paraxial region thereof.
In the embodiment of the present application, the focal length reference wavelength of each lens is 577.5618nm, the reference wavelength of the refractive index and the abbe number is 577.5618nm, the relevant parameters of the imaging system 100 are shown in table 11, f in table 11 is the focal length of the imaging system 100, FNO represents the f-number, and FOV represents the maximum field angle of the imaging system 100; the units of focal length, radius of curvature and thickness are all mm.
TABLE 11
In the embodiment of the present application, the conic constant K and aspheric coefficient corresponding to the aspheric surface are shown in table 12:
TABLE 12
As can be seen from the aberration diagrams in fig. 12, the longitudinal spherical aberration, curvature of field, and distortion of the imaging system 100 are well controlled, so that the imaging system 100 of this embodiment has good imaging quality.
The data for the six examples above are as in table 13 below:
watch 13
In the description of the present application, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art. Further, in the description of the present application, "a plurality" means two or more unless otherwise specified. "and/or" describes the association relationship of the associated objects, meaning that there may be three relationships, e.g., a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present application and is not to be construed as limiting the scope of the present application, so that the present application is not limited thereto, and all equivalent variations and modifications can be made to the present application.
Claims (11)
1. An imaging system, comprising, in order from an object side to an image side along an optical axis:
a first lens element with negative refractive power;
a second lens element with negative refractive power;
a third lens element with positive refractive power having convex object-side and image-side surfaces near the optical axis;
a fourth lens element with negative refractive power having a concave object-side surface and a concave image-side surface both near the optical axis;
a fifth lens element with positive refractive power;
a sixth lens element with positive refractive power having convex object-side and image-side surfaces near the optical axis;
the imaging system comprises six lenses with focal power;
the imaging system satisfies the following conditional expression:
19.5mm<f1*f2/f<24mm；
3<CT6/|Sags12|<5；
wherein f1 is a focal length of the first lens element, f2 is a focal length of the second lens element, f is an effective focal length of the imaging system, CT6 is a thickness of the sixth lens element on the optical axis, and Sags12 is a distance from a maximum clear aperture of the image-side surface of the sixth lens element to an intersection point of the image-side surface of the sixth lens element and the optical axis along a direction parallel to the optical axis.
2. The imaging system of claim 1, further satisfying the following conditional expression:
120°<FOV<130°
wherein the FOV is a maximum field angle of the imaging system.
3. The imaging system of claim 1, further satisfying the following conditional expression:
7<f45/f<10.1
wherein f45 is the combined focal length of the fourth lens and the fifth lens.
4. The imaging system of claim 1, further satisfying the following conditional expression:
1.6<f3/CT3<5.6
wherein f3 is the focal length of the third lens element, and CT3 is the thickness of the third lens element on the optical axis.
5. The imaging system of claim 1, further satisfying the following conditional expression:
1<(Rs3+Rs4)/(Rs3-Rs4)<4
wherein Rs3 is the radius of curvature of the object-side surface of the second lens, and Rs4 is the radius of curvature of the image-side surface of the second lens.
6. The imaging system of claim 1, further satisfying the following conditional expression:
-3.2mm*10 -6 /℃<(CT5-CT4)*(a5-a4)<-1mm*10 -6 /℃
wherein CT4 is the thickness of the fourth lens on the optical axis, CT5 is the thickness of the fourth lens on the optical axis, a4 is the thermal expansion coefficient of the fourth lens at-30 ℃ -70 ℃, and a5 is the thermal expansion coefficient of the fifth lens at-30 ℃ -70 ℃.
7. The imaging system of claim 1, further comprising a diaphragm, the imaging system further satisfying the following conditional:
2.5<TTL/DOS<3.1
wherein, TTL is a distance from the object-side surface of the first lens element to the imaging surface of the imaging system on the optical axis, and DOS is a distance from the object-side surface of the first lens element to the diaphragm on the optical axis.
8. The imaging system of claim 1, further satisfying the following conditional expression:
3.5<2*Imgh/EPD<4.1
wherein Imgh is half of the image height corresponding to the maximum field angle of the imaging system, and EPD is the entrance pupil diameter of the imaging system.
9. A lens module, comprising:
the imaging system of any one of claims 1 to 8;
the photosensitive element is arranged on the image side of the imaging system.
10. An electronic device, comprising:
a housing; and
the imaging system of claim 9, disposed within the housing.
11. A vehicle comprising the electronic device of claim 10.
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Effective date of registration: 20230526 Address after: 330096 No.699 Tianxiang North Avenue, Nanchang hi tech Industrial Development Zone, Nanchang City, Jiangxi Province Patentee after: Jiangxi Oufei Optics Co.,Ltd. Address before: No.2, Hongyuan Road, economic development zone, Xiqing District, Tianjin Patentee before: Tianjin Oufei photoelectric Co.,Ltd. |