CN113359279B - Optical lens assembly, lens module and electronic equipment - Google Patents
Optical lens assembly, lens module and electronic equipment Download PDFInfo
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- CN113359279B CN113359279B CN202110667529.9A CN202110667529A CN113359279B CN 113359279 B CN113359279 B CN 113359279B CN 202110667529 A CN202110667529 A CN 202110667529A CN 113359279 B CN113359279 B CN 113359279B
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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
- G02B13/18—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
- 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 invention provides an optical lens group, a lens module and an electronic device. The optical lens assembly 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 and the second lens have negative focal power, the third lens and the fourth lens have positive focal power, the fifth lens and the sixth lens have opposite focal power, the object side surface of the fifth lens and the image side surface of the sixth lens are both concave surfaces, and the ratio of the maximum effective semi-caliber of the object side surface of the first lens to the maximum effective semi-caliber of the image side surface of the sixth lens ranges from 1.3 to 2.3. The optical lens group provided by the invention can be balanced between miniaturization and high pixel, and the sizes of the head end and the tail end can be balanced, so that the overall size of the optical lens group is reduced, the optical lens group can be accommodated in a lens cone with a relatively simple structure, and the assembly yield of the optical lens group is improved.
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens assembly, a lens module and an electronic apparatus.
Background
At present, cameras are widely used in a plurality of fields such as mobile phones, vehicles, monitoring, security protection, medical treatment and the like. However, with the development of scientific technology, the demand of the market for the camera is higher and higher. For example, with the development of the technology in the automobile industry, the market has higher and higher requirements for vehicle-mounted cameras such as Advanced Driving Assistance Systems (ADAS) and back-up images. People hope that the ADAS system and the camera of the image of backing a car can also have the characteristic of high-definition imaging under the condition of obtaining a larger field angle, so that the safety driving of a driver is guaranteed in the driving and backing processes. In order to obtain a large field angle and a clear image at the same time, the lens in the related art is often assembled by matching a plurality of lenses, so that the size of the assembled lens is large.
Disclosure of Invention
In view of the above, the present invention provides an optical lens assembly, a lens module and an electronic apparatus, wherein the optical lens assembly can balance the miniaturization and the high pixel, and can balance the sizes of the head and the tail ends, which is beneficial to accommodating the optical lens assembly in a lens barrel with a relatively simple structure, thereby improving the assembly yield of the optical lens assembly and reducing the overall size of the optical lens assembly.
A first aspect of the present invention provides an optical lens assembly, which 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. Wherein the first lens and the second lens have negative focal power, the third lens and the fourth lens have positive focal power, the fifth lens and the sixth lens have opposite focal power, and both the object-side surface of the fifth lens and the image-side surface of the sixth lens are concave; the maximum effective semi-aperture of the object side surface of the first lens is defined as SD11, the maximum effective semi-aperture of the image side surface of the sixth lens is defined as SD62, and the SD11 and the SD62 satisfy the relation: 1.3 < SD11/SD62 < 2.3.
Based on the optical lens group provided by the embodiment of the invention, the balance between miniaturization and high pixel is realized, and good optical performance is kept, so that the details of a shot object can be well captured. The first lens and the second lens provide negative bending force for the optical lens group, so that incident light rays forming large angles with the optical axis can enter the optical system and can be effectively converged. The positive bending force of the third lens and the fourth lens is matched, so that the central field of view and the marginal field of view can be further converged, the total length of the optical system is favorably compressed, and the marginal field of view aberration generated by the first lens and the second lens is effectively corrected. The bending force provided by the fifth lens is opposite to the bending force of the sixth lens, and the aberration generated by each other can be counteracted. The design of the concave surface on the object side surface of the fifth lens and the concave surface on the image side surface of the sixth lens can balance the difficult-to-correct aberration caused by the lenses of the object space when converging incident light, and can further converge the light of the central field of view, thereby compressing the total length of the optical system and better inhibiting spherical aberration. The ratio of the maximum effective semi-aperture of the object side surface of the first lens to the maximum effective semi-aperture of the image side surface of the sixth lens is limited, so that the sizes of the head end and the tail end of the optical lens group are balanced, the overall size of the optical lens group is reduced, the optical lens group can be accommodated in a lens barrel with a relatively simple structure, the assembly yield of the optical lens group is improved, the incident and emergent apertures of light rays are limited, the light rays cannot be bent and distorted excessively, and the energy loss is reduced.
In some embodiments, an effective focal length of the optical lens group is defined as f, and a combined focal length of the second lens element and the third lens element is defined as f23, where f23 and f satisfy the following relation: 2.5 < f23/f < 60.
Based on the above embodiment, by limiting the combined focal length of the second lens and the third lens, so that the second lens and the third lens have positive bending force as a whole, the tendency of light rays between the first lens and the fourth lens can be controlled, thereby correcting aberration caused by large-angle light rays emitted through the first lens, and facilitating improvement of imaging resolution. Preferably, in an embodiment, the image-side surface of the second lens element and the object-side surface of the third lens element are cemented to form the first cemented lens element, so that the sensitivity of a single lens element of the second lens element and the third lens element can be reduced, the problem of non-uniform performance of the single lens element can be suppressed, the chromatic aberration of the optical lens assembly can be reduced, and the correction of the aberration of the optical lens assembly can be facilitated, thereby improving the imaging resolution and improving the imaging quality; moreover, the second lens and the third lens are glued, and the space occupied by the second lens and the third lens is reduced, so that the whole structure of the optical lens group is compact, in addition, the accumulated tolerance of the two lenses is set to the tolerance of an integrated element, the eccentricity sensitivity can be reduced, the assembly convenience of the optical lens group is improved, the assembly sensitivity is reduced, and the requirement of structure miniaturization is met.
In some embodiments, an effective focal length of the optical lens group is defined as f, and a combined focal length of the fourth lens element and the fifth lens element is defined as f45, where f45 and f satisfy the following relation: f45/f is more than 1.5 and less than 80.
Based on the above embodiment, by limiting the combined focal length of the fourth lens element and the fifth lens element, the fourth lens element and the fifth lens element have positive bending force as a whole, and the tendency of light between the third lens element and the sixth lens element can be controlled, so that aberration caused by large-angle light emitted from the third lens element is corrected, and the improvement of imaging resolution is facilitated. Preferably, in an embodiment, an image-side surface of the fourth lens element and an object-side surface of the fifth lens element are cemented to form a second cemented lens element, so that the sensitivity of a single lens element in the fourth lens element and the fifth lens element can be reduced, the problem of non-uniform performance of the single lens element can be suppressed, the chromatic aberration of the optical lens assembly can be reduced, and the correction of the aberration of the optical lens assembly can be facilitated, thereby improving the imaging resolution and improving the imaging quality; moreover, the fourth lens element and the fifth lens element are glued together, and the space occupied by the fourth lens element and the fifth lens element is reduced, so that the overall structure of the optical lens assembly is compact, and in addition, the accumulated tolerance of the two lens elements is set to the tolerance of an integrated element, so that the eccentricity sensitivity can be reduced, the assembly convenience of the optical lens assembly is improved, the assembly sensitivity of the optical lens assembly is reduced, and the requirement of structural miniaturization is met.
Further preferably, in an embodiment, the second lens element and the third lens element, and the fourth lens element and the fifth lens element are cemented together at the same time, and the two groups of cemented lenses have the same effect, which is more favorable for reducing or even eliminating chromatic aberration of the optical lens assembly, and makes the overall structure of the optical lens assembly more compact, thereby further improving the convenience of assembling the optical lens assembly, and further meeting the requirement of miniaturization.
In some embodiments, a radius of an effective imaging circle of the optical lens group is defined as ImgH, an f-number of the optical lens group is defined as FNO, and ImgH and FNO satisfy: 1.8mm-lined imgh/FNO <3mm.
Based on the embodiment, the ratio of the radius of the effective imaging circle of the optical lens group to the diaphragm number of the optical lens group is limited, so that the optical lens group has a large image surface, a high-pixel photosensitive chip can be matched, and the image resolution is improved; meanwhile, the optical lens group is provided with a large aperture, so that the light incoming quantity is increased, the aberration which is difficult to correct is avoided in the marginal field of view, and high-imaging-resolution imaging is facilitated. If the lower limit (1.8 mm) is exceeded and the f-number is constant, the image height is easy to be insufficient, and the high-pixel photosensitive chip is difficult to match; if the height of the image exceeds the upper limit (3 mm), the diaphragm number becomes too small at a constant image height, and the aberration becomes difficult to deal with.
In some embodiments, a thickness of the first lens element on the optical axis is defined as CT1, a focal length of the first lens element is defined as f1, wherein f1 and CT1 satisfy the following relation: -45 < f1/CT1 < -6.5.
Based on the above embodiment, the variation of the thickness (i.e. the central thickness) of the first lens element on the optical axis may affect the effective focal length of the optical lens assembly, and the ratio between the focal length of the first lens element and the thickness of the first lens element on the optical axis is defined, so that the tolerance sensitivity of the central thickness of the first lens element and the difficulty of the processing technique of the single lens element can be reduced, which is beneficial to improving the assembly yield and the imaging quality of the optical lens assembly, and reducing the production cost. If the absolute value of the focal length of the first lens exceeds the lower limit (-45), the bending force is insufficient, and the high-order aberration is not favorably inhibited, so that the phenomena of high-order spherical aberration, coma aberration and the like occur to influence the resolution and the imaging quality of the optical lens group; if the bending force of the first lens is too strong and the center thickness is too thin when the bending force exceeds the upper limit (-6.5), the width of the light beam is easily shrunk rapidly, so that the incident angle of the light beam incident on the rear lens group is increased, and the burden of the rear lens group for reducing the light beam angle of the light beam emitted out of the optical lens group is increased.
In some embodiments, a thickness of the sixth lens element along the optical axis is defined as CT6, an edge thickness of the sixth lens element is defined as ET6, and CT6 and ET6 satisfy the following relation: CT6/ET6 is more than 0.8 and less than 1.7.
Based on the above embodiment, the thickness (i.e. the central thickness) of the sixth lens element on the optical axis, the distance (i.e. the edge thickness) from the maximum effective diameter of the object-side surface to the maximum effective diameter of the image-side surface in the direction parallel to the optical axis, the ratio of the two reflects the spatial distribution of the volume of the sixth lens element, and the thickness ratio of the center to the edge of the sixth lens element is defined, so that the volume distribution of the sixth lens element is uniform, which is beneficial to the processing and forming of the lens element, reduces the production difficulty of the sixth lens element, and at the same time, the sixth lens element does not generate too large aberration, otherwise, the aberration balance is stressed, and the design optimization is difficult.
In some embodiments, the maximum half field angle of the optical lens assembly is defined as HFOV, which satisfies the relationship: 25 DEG < HFOV < 50 deg.
Based on the above embodiment, by limiting the value of the maximum half field angle of the optical lens group, the field angle and the focal length of the optical lens group can be balanced, thereby facilitating the free selection of an appropriate field angle to expand the field of view or to achieve sharp telephoto.
In some embodiments, the optical lens assembly further includes a stop, a distance between an object-side surface of the first lens element and the stop on the optical axis is DOS, an overall optical length of the optical lens assembly is defined as TTL, and DOS and TTL satisfy: DOS/TTL is more than 0.4 and less than 0.6.
Based on the above embodiment, the total optical length of the optical lens group is the distance from the object side surface of the first lens to the imaging surface on the optical axis, the total optical length of the optical lens group is affected by the distance from the object side surface of the first lens to the diaphragm, and the ratio of the total optical length to the object side surface of the first lens to the diaphragm is limited, so that the optical lens group is compact in structure, meets the miniaturization requirement, and meanwhile, is favorable for large-angle light beams to enter the optical lens group and then have sufficiently long distance gradually gentle incident angles, so that the light incident angle on the final imaging surface is as small as possible, the improvement of the light sensing efficiency is facilitated, and the occurrence of dark angles is reduced. Optionally, in an embodiment, the diaphragm is disposed between the third lens and the fourth lens.
In a second aspect, the present invention provides a lens module, which includes a photosensitive element and the optical lens assembly of any of the above embodiments, wherein a photosensitive surface of the photosensitive element is located on an image plane of the optical lens assembly. The optical lens group is used for receiving a light signal of a shot object and projecting the light signal to the photosensitive element, and the photosensitive element is used for converting the light signal corresponding to the shot object into an image signal.
The lens module provided by the embodiment of the invention has good optical performance and can well capture the details of a shot object.
In a third aspect, the present invention provides an electronic device, which includes a housing and the above lens module, where the lens module includes a photosensitive element and the optical lens assembly of any of the above embodiments, the lens module is disposed in the housing, and a photosensitive surface of the photosensitive element is located on an image plane of the optical lens assembly. The optical lens group is used for receiving a light signal of a shot object and projecting the light signal to the photosensitive element, and the photosensitive element is used for converting the light signal corresponding to the shot object into an image signal.
Based on the electronic equipment provided by the embodiment of the invention, the lens module has a good imaging effect, and is beneficial to improving the product quality of the electronic equipment and the use experience of a user. In some exemplary embodiments, the electronic device may be any kind of camera, such as an in-vehicle camera, a monitoring camera, and the like, and may also be an electronic product including the camera, such as a vehicle, a drone, and the like.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens assembly according to a first embodiment of the present invention.
FIG. 2 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical lens assembly according to the first embodiment of the present invention.
Fig. 3 is a schematic structural view of an optical lens assembly according to a second embodiment of the present invention.
FIG. 4 is a spherical aberration diagram, an astigmatism diagram and a distortion diagram of the optical lens assembly according to the second embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention.
Fig. 6 is a spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly according to the third embodiment of the present invention.
Fig. 7 is a schematic structural diagram of an optical lens assembly according to a fourth embodiment of the present invention.
Fig. 8 is a spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens assembly according to the fourth embodiment of the invention.
Fig. 9 is a schematic structural view of an optical lens assembly according to a fifth embodiment of the present invention.
Fig. 10 is a spherical aberration graph, an astigmatism graph and a distortion graph of the optical lens assembly according to the fifth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without inventive step, shall fall within the scope of protection of the present invention.
In the related art, a camera is widely used in a plurality of fields including but not limited to mobile phones, vehicles, monitoring, security, medical treatment and the like. However, with the development of scientific technology, the demand of the market for the camera is higher and higher. For example, with the continuous development of the technology in the automobile industry, the market has higher and higher requirements for vehicle-mounted cameras such as advanced driving assistance systems and reverse images.
In the process of implementing a camera based on the related art, the inventor finds that the camera lens in the related art is difficult to simultaneously meet shooting and clear imaging in a large angle range, so that early warning is difficult to accurately make in real time, and further, driving risks are caused.
In view of the above technical problem, the present invention provides an optical lens assembly 100, which achieves a balance between miniaturization and high pixel count. Specifically, referring to fig. 1, the optical lens assembly 100 includes, in order from an object side to an image side along an optical axis, a first lens element E1, a second lens element E2, a third lens element E3, a fourth lens element E4, a fifth lens element E5 and a sixth lens element E6. In the optical lens assembly 100, the object side refers to a side of the optical lens assembly 100 facing the object, and the image side refers to a side of the optical lens assembly 100 forming an image of the object reflected by the optical lens assembly 100 passing through the light inlet (located at the object side of the optical lens assembly 100) on the image plane.
In the embodiment of the present invention, the first lens E1 and the second lens E2 each have a negative power (i.e., have a power of diverging light), the third lens E3 and the fourth lens E4 each have a positive power (i.e., have a power of converging light), and the fifth lens E5 and the sixth lens E6 have opposite powers. Specifically, as shown in fig. 1, in the first embodiment, the fifth lens E5 has a negative power, and the sixth lens E6 has a positive power. Obviously, in other embodiments, the fifth lens E5 may have a positive optical power, and correspondingly, the sixth lens E6 has a negative optical power.
In addition, in the embodiment of the invention, the object-side surface S1 of the first lens element E1 is a convex surface, the image-side surface S2 thereof is a concave surface, the object-side surface S3 and the image-side surface S4 of the second lens element E2 are both concave surfaces, the object-side surface S5 and the image-side surface S6 of the third lens element E3 are both convex surfaces, the object-side surface S7 and the image-side surface S8 of the fourth lens element E4 are also both convex surfaces, the object-side surface S9 of the fifth lens element E5 is a concave surface, the image-side surface S10 and the object-side surface S9 thereof may have the same or different surface types, the object-side surface S11 of the sixth lens element E6 is a convex surface, the image-side surface S12 thereof is a concave surface, the protective lens element E7 has a first surface S13 facing the sixth lens element E6 and a second surface S14 facing away from the sixth lens element E6, and light from the object sequentially passes through the surfaces S1 to S14 and is finally imaged on the imaging surface S15. Specifically, as shown in fig. 1, in the first embodiment, both the object-side surface S9 and the image-side surface S10 of the fifth lens element E5 and the image-side surface S12 of the sixth lens element E6 are concave. Obviously, in other embodiments, the image-side surface S10 of the fifth lens E5 may be a convex surface, as long as the fifth lens E5 and the sixth lens E6 have opposite optical powers.
In addition, in any lens, a surface close to an object is referred to as an object side surface of the lens, a surface far from the object is referred to as an image side surface of the lens, and a surface shape of the object side surface or the image side surface is defined by positive and negative values of a curvature radius of the object side surface or the image side surface at an optical axis. Specifically, when the curvature radius of the object-side surface or the image-side surface of the lens at the optical axis is positive, the surface shape of the object-side surface is defined as convex, and the surface shape of the image-side surface is defined as concave, and correspondingly, when the curvature radius of the object-side surface or the image-side surface of the lens at the optical axis is negative, the surface shape of the object-side surface is defined as concave, and the surface shape of the image-side surface is defined as convex. The object-side surface and the image-side surface of any lens can be understood as an optically effective area of the lens, and when the optical axis refers to an area near the optical axis and describes the surface shape of the lens surface at the optical axis, the surface shape of the lens surface at least at the optical axis can be expressed.
Further, in some embodiments of the present invention, a maximum effective half aperture of the object-side surface S1 of the first lens element E1 is defined as SD11, and a maximum effective half aperture of the image-side surface S12 of the sixth lens element E6 is defined as SD62, where SD11 and SD62 satisfy the following relation: 1.3 < SD11/SD62 < 2.3.
According to the optical lens group 100 provided by the embodiment of the invention, through reasonably matching the focal powers and the surface types of the plurality of lenses, the miniaturization and the high pixel balance are realized, so that the optical lens group 100 keeps good optical performance, and the details of a shot object can be well captured. The negative bending force provided by the first lens element E1 and the second lens element E2 for the optical lens assembly 100 is beneficial for incident light rays with a large angle with the optical axis to enter the optical system and to be effectively converged. The light rays of the central and peripheral fields of view can be further converged in cooperation with the positive refractive power of the third lens E3 and the fourth lens E4, thereby facilitating the compression of the total length of the optical system and effectively correcting the peripheral field of view aberration generated via the first lens E1 and the second lens E2. The bending force provided by the fifth lens E5 and the bending force of the sixth lens E6 are opposite to each other, and the aberrations generated by each other can be offset. The object side surface S9 of the fifth lens E5 and the image side surface S12 of the sixth lens E6 are both of a concave surface type design, so that aberrations which are difficult to correct when incident light rays are converged by each lens of the object side can be balanced, and light rays of a central field of view can be further converged, thereby compressing the total length of the optical system and also preferably suppressing spherical aberration. Moreover, by limiting the ratio of the maximum effective semi-caliber SD11 of the object-side surface S1 of the first lens element E1 to the maximum effective semi-caliber SD62 of the image-side surface S12 of the sixth lens element E6, the sizes of the head and the tail of the optical lens assembly 100 are balanced, the overall size of the optical lens assembly 100 is reduced, and the optical lens assembly 100 is accommodated in a lens barrel with a relatively simple structure, so that the assembly yield of the optical lens assembly 100 is improved, the incident and emergent calibers of light rays are limited, the light rays are not bent or distorted excessively, and energy loss is reduced.
In some embodiments of the present invention, an effective focal length of the optical lens group 100 is defined as f, and a combined focal length of the second lens element E2 and the third lens element E3 is defined as f23, where f23 and f are defined to satisfy the following relation: 2.5 < f23/f < 60.
In the embodiment of the present invention, the light beam has a large angle after being emitted through the first lens element E1 with negative focal power, and the second lens element E2 and the third lens element E3 have positive refractive power as a whole by defining the combined focal length f23 of the second lens element E2 and the third lens element E3, so that the tendency of the light beam between the first lens element E1 and the fourth lens element E4 can be controlled, thereby correcting the aberration caused by the large-angle light beam emitted through the first lens element E1, and facilitating to improve the final imaging resolution of the optical lens assembly 100. It will be appreciated that the combined focal length f23 of the second lens E2 and the third lens E3 is related to the distance between the two along the optical axis and the respective dimensions. Preferably, as shown in fig. 1, in an embodiment, an image-side surface S4 of the second lens element E2 and an object-side surface S5 of the third lens element E3 are cemented to form a first cemented lens, so that the sensitivity of a single lens element in the second lens element E2 and the third lens element E3 can be reduced, the problem of non-uniform performance of the single lens element can be suppressed, the chromatic aberration of the optical lens assembly 100 can be reduced, and the aberration of the optical lens assembly 100 can be corrected, thereby improving the imaging resolution and improving the imaging quality; moreover, the second lens element E2 and the third lens element E3 are cemented together, and the space occupied by the two lens elements is reduced, so that the overall structure of the optical lens assembly 100 is compact, and in addition, the tolerance of an integrated element is set to the accumulated tolerance of the two lens elements, so that the decentering sensitivity can be reduced, which is beneficial to improving the assembly convenience of the optical lens assembly 100 and reducing the assembly sensitivity thereof, and meets the requirement of structure miniaturization.
It should be noted that, if the ratio of f23/f exceeds the lower limit (2.5), the difference between the central thicknesses (i.e., the thicknesses on the optical axis) of the second lens E2 and the third lens E3 is too large, which is not favorable for the gluing process, and meanwhile, in an environment with large variation in high and low temperature environments, the difference between the cold and hot deformation amounts caused by the difference in thicknesses is large, which is likely to cause phenomena such as glue cracking or glue failure; if the ratio f23/f exceeds the upper limit (60), the combined focal length of the second lens element E2 and the third lens element E3 is too large, and the first cemented lens is prone to generate a serious astigmatism, which is not favorable for improving the imaging quality.
In some embodiments of the present invention, a combined focal length of the fourth lens E4 and the fifth lens E5 is defined as f45, where f45 and f are defined to satisfy the following relation: f45/f is more than 1.5 and less than 80.
By defining the combined focal length f45 of the fourth lens element E4 and the fifth lens element E5, so that the fourth lens element E4 and the fifth lens element E5 have positive refractive power as a whole, the tendency of light between the third lens element E3 and the sixth lens element E6 can be controlled, so as to correct the aberration caused by the high-angle light emitted from the third lens element E3, and to improve the imaging resolution of the optical lens assembly 100. It will also be appreciated that the combined focal length f45 of the fourth lens E4 and the fifth lens E5 is related to the distance along the optical axis between them and to their respective dimensions. Preferably, as shown in fig. 1, in an embodiment, an image-side surface S8 of the fourth lens element E4 and an object-side surface S9 of the fifth lens element E5 are cemented to form a second cemented lens, so that the sensitivity of a single lens element in the fourth lens element E4 and the fifth lens element E5 can be reduced, the problem of non-uniform performance of the single lens element can be suppressed, the chromatic aberration of the optical lens assembly 100 can be reduced, and the aberration of the optical lens assembly 100 can be corrected, thereby improving the imaging resolution and improving the imaging quality; moreover, the fourth lens element E4 and the fifth lens element E5 are cemented together, and the space occupied by the two lens elements is reduced, so that the overall structure of the optical lens assembly 100 is compact, and in addition, the tolerance of the integrated element is set to the cumulative tolerance of the two lens elements, so that the decentering sensitivity can be reduced, which is also beneficial to improving the assembly convenience of the optical lens assembly 100 and reducing the assembly sensitivity of the optical lens assembly 100, and also meets the requirement of structure miniaturization.
It should be noted that, if the ratio of f45/f exceeds the lower limit (1.5), the difference between the central thicknesses (i.e., the thicknesses on the optical axis) of the fourth lens E4 and the fifth lens E5 is too large, which is not favorable for the gluing process of the two lenses, and meanwhile, in an environment with large variation in high and low temperature environments, the difference between the cold and hot deformation amounts caused by the difference in thicknesses is large, which is easy to generate phenomena such as glue cracking or glue failure; if the ratio of f45/f exceeds the upper limit (80), the combined focal length of the fourth lens element E4 and the fifth lens element E5 is too large, and the second cemented lens is prone to generate a severe astigmatism phenomenon, which is not favorable for improving the imaging quality.
As a preferred embodiment, in an embodiment, the second lens element E2 is cemented with the third lens element E3, and the fourth lens element E4 is also cemented with the fifth lens element E5, and the two cemented lens elements have the same effect, which is more favorable for reducing or even eliminating chromatic aberration of the optical lens assembly 100, and makes the overall structure of the optical lens assembly 100 more compact, further improves the assembly convenience of the optical lens assembly 100, and further meets the requirement of miniaturization.
Obviously, in other embodiments, the optical lens assembly 100 may be formed by only the second lens element E2 and the third lens element E3 being cemented together, or only the fourth lens element E4 and the fifth lens element E5 being cemented together, which also has the same effects as above, and details thereof are not described herein. It is understood that, in other embodiments, in the optical lens group 100, the second lens element E2 and the third lens element E3, and the fourth lens element E4 and the fifth lens element E5 may not be cemented together, and the same purpose can be achieved by adjusting the distance or the size between the corresponding lens groups along the optical axis, which is not described herein again.
In some embodiments of the present invention, a radius of an effective imaging circle of the optical lens group 100 is defined as ImgH, and an f-number of the optical lens group 100 is defined as FNO, wherein ImgH and FNO are defined to satisfy the relation: 1.8mm-lined imgh/FNO <3mm.
By limiting the ratio of the radius ImgH of the effective imaging circle of the optical lens group 100 to the f-number FNO of the optical lens group 100, the optical lens group 100 can have a large image plane, so that a high-pixel photosensitive chip can be matched, and the image resolution is improved; meanwhile, the optical lens group 100 has a large aperture, which is beneficial to increase the light incident quantity, thereby avoiding aberration which is difficult to correct and is beneficial to high imaging resolution imaging caused by the marginal field. If the f-number FNO of the optical lens group 100 exceeds the lower limit (1.8 mm), the final image height is easy to be insufficient, and it is difficult to match the high-pixel photosensitive chip; if the upper limit (3 mm) is exceeded, the image imaged by the optical lens group 100 is higher than a certain height, the f-number FNO is too small, and the aberration is difficult to process.
In some embodiments of the present invention, a thickness (i.e. a central thickness) of the first lens element E1 on the optical axis is defined as CT1, a focal length of the first lens element E1 is defined as f1, wherein f1 and CT1 are defined to satisfy the following relation: -45 < f1/CT1 < -6.5.
Since the effective focal length of the optical lens assembly 100 is affected by the change of the central thickness CT1 of the first lens element E1, the tolerance sensitivity of the central thickness of the first lens element E1 and the difficulty of the processing technique of the single lens element can be reduced by limiting the ratio of the focal length f1 of the first lens element E1 to the central thickness CT1 of the first lens element E1 within a reasonable range, which is beneficial to improving the assembly yield and the imaging quality of the optical lens assembly 100 and reducing the production cost. If the ratio f1/CT1 exceeds the lower limit (-45), and the absolute value of the focal length f1 of the first lens element E1 is too large, the bending force is insufficient, which is not favorable for suppressing high-order aberration, so that high-order spherical aberration, coma aberration and other phenomena occur, which may affect the resolution and imaging quality of the optical lens assembly 100; conversely, if the ratio f1/CT1 exceeds the upper limit (-6.5), the bending force of the first lens element E1 is too strong and the central thickness CT1 is too thin, which tends to cause the width of the light beam to shrink rapidly, thereby increasing the incident angle of the light rays to the rear lens group and increasing the burden of the rear lens group on reducing the light emitting angle of the light rays exiting the optical lens assembly 100.
In some embodiments of the present invention, a thickness (i.e., a center thickness) of the sixth lens element E6 in the optical axis is defined as CT6, an edge thickness (i.e., a distance in a direction parallel to the optical axis from the maximum effective diameter of the object side surface to the maximum effective diameter of the image side surface of the sixth lens element) of the sixth lens element E6 is defined as ET6, where CT6 and ET6 are defined to satisfy the following relation: CT6/ET6 is more than 0.8 and less than 1.7.
It is understood that the ratio of the central thickness CT6 of the sixth lens element E6 to the edge thickness ET6 of the sixth lens element E6 reflects the spatial distribution of the volume of the sixth lens element E6, and the thickness ratio of the center to the edge of the sixth lens element E6 is defined, so that the volume distribution of the sixth lens element E6 is uniform, which is beneficial to the processing and forming of the sixth lens element E6, and reduces the difficulty in producing the sixth lens element E6, and at the same time, the sixth lens element E6 does not generate too large aberration, otherwise, it will generate pressure for balancing the aberration of the optical lens assembly 100, and it is difficult to optimize the design. In addition, on the premise of satisfying the optical performance of the optical lens assembly 100, since the density of the glass lenses is relatively high, the larger the center thickness of the sixth lens element E6 is, the larger the weight thereof is, which is not favorable for the light-weight characteristic of the optical lens assembly 100.
Further, in the embodiment of the present invention, at least one lens of the optical lens assembly 100 has an aspheric surface, and when at least one side surface (object-side surface or image-side surface) of the lens is aspheric, the lens is said to have the aspheric surface. 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 optical lens assembly 100 to effectively eliminate aberration and improve image quality. In some embodiments, at least one lens in the optical lens assembly 100 may also have a spherical surface shape, and the design of the spherical surface shape can reduce the difficulty and cost of manufacturing the lens. In some embodiments, in order to achieve manufacturing cost, manufacturing difficulty, imaging quality, assembly difficulty, and the like, the design of each lens surface of the optical lens assembly 100 may be configured by an aspheric surface and a spherical surface.
It should also be noted that when a lens surface is aspheric, the lens surface may have a reverse curvature where the surface will change its type in the radial direction, e.g. one lens surface is convex near the optical axis and concave near the maximum effective aperture. Specifically, in some embodiments of the present invention, both the object-side surface S11 and the image-side surface S12 of the sixth lens element E6 are aspheric.
Compared with a spherical lens with constant curvature, the aspherical lens has the characteristic that the curvature from the center of the lens to the periphery of the lens is continuously changed, and the aspherical lens has better curvature radius characteristic, so that the problems of distortion aberration and astigmatic aberration can be improved. After the sixth lens element E6 is an aspheric lens, the aberration generated during imaging of the optical lens assembly 100 can be effectively eliminated, so as to improve the final imaging quality of the optical lens assembly 100.
In some embodiments of the present invention, the maximum half field angle of the optical lens assembly 100 is defined as HFOV, which is defined to satisfy the relation: 25 DEG < HFOV < 50 deg.
By limiting the value of the maximum half field angle HFOV of the optical lens group 100, the field angle and the focal length of the optical lens group 100 can be balanced, thereby facilitating to freely select a proper field angle to enlarge the field of view or to sharply zoom out.
Referring to fig. 1 again, in some embodiments of the present invention, the optical lens assembly 100 further includes a stop ST disposed between the third lens element E3 and the fourth lens element E4, a distance between the object-side surface S1 of the first lens element E1 and the stop ST on the optical axis is defined as DOS, and an optical total length of the optical lens assembly 100 (i.e., a distance between the object-side surface S1 of the first lens element E1 and the image plane S15 on the optical axis) is defined as TTL, where DOS and TTL satisfy the following relation: DOS/TTL is more than 0.4 and less than 0.6.
It can be understood that the total optical length TTL of the optical lens assembly 100 is affected by the distance DOS from the object-side surface S1 of the first lens element E1 to the diaphragm ST, and the ratio of the total optical length TTL to the object-side surface S1 of the first lens element E1 is limited, which is favorable for making the optical lens assembly 100 compact and satisfying the miniaturization requirement, and is favorable for making the large-angle light beam have a sufficiently long distance to gradually smooth the incident angle after entering the optical lens assembly 100, so that the light incident angle on the final image plane S15 is as small as possible, which is favorable for improving the light sensing efficiency and reducing the occurrence of dark angles.
In an embodiment of the present invention, the first lens element E1 to the sixth lens element E6 may be made of plastic or glass. In some embodiments, at least one lens in the optical lens assembly 100 is made of Plastic (PC), and the Plastic material may be polycarbonate, gum, or the like. In some embodiments, at least one lens of the optical lens assembly 100 is made of Glass (GL). The lens made of plastic can reduce the production cost of the optical lens assembly 100, and the lens made of glass can endure a higher or lower temperature and has an excellent optical effect and better stability. In some embodiments, the optical lens assembly 100 may be configured with lenses made of different materials, 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 actual requirements, which is not exhaustive.
The present invention further provides a lens module, which includes a photosensitive element and the optical lens assembly 100 of any of the above embodiments, wherein a photosensitive surface of the photosensitive element is located on an image plane S15 of the optical lens assembly 100. The optical lens group 100 is configured to receive an optical signal of an object and project the optical signal to the light sensing device, the light sensing device is configured to convert the optical signal corresponding to the object into an image signal, and the light sensing device may be a light sensing device commonly used in the prior art, such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).
It can be understood that the lens module provided by the invention has all functions and characteristics of the optical lens group 100, has good optical performance, and can well capture details of a shot object, thereby achieving a good imaging effect.
Further, the present invention also provides an electronic device, which includes a housing and the lens module described above, where the lens module includes a photosensitive element and the optical lens assembly 100 of any of the above embodiments, the lens module is disposed in the housing, and a photosensitive surface of the photosensitive element is located on an image plane S15 of the optical lens assembly 100.
The optical lens group 100 is configured to receive an optical signal of a subject and project the optical signal to the light sensing element, where the light sensing element is configured to convert the optical signal corresponding to the subject into an image signal, and the light sensing element may be a light sensing element commonly used in the prior art, such as a Charge Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS).
It can be understood that the lens module of the electronic equipment has a good imaging effect, and is favorable for improving the product quality of the electronic equipment and the use experience of a user.
The electronic device may be any kind of camera, including but not limited to an on-vehicle camera or a monitoring camera, and may also be an electronic product including the camera, including but not limited to a vehicle or an unmanned aerial vehicle.
Specific examples of the optical lens group 100 that can be applied to the above-described embodiments are further described below with reference to the drawings.
Example one
Referring to fig. 1, a schematic structural diagram of an optical lens assembly 100 according to a first embodiment of the present invention is shown. As shown in fig. 1, along the optical axis from the object side to the image side, the optical lens assembly 100 sequentially includes: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.
The first lens element E1 has negative focal power, an object-side surface S1 of the first lens element E1 is a convex surface at an optical axis, and an image-side surface S2 of the first lens element E1 is a concave surface at the optical axis; the second lens element E2 has negative focal power, an object-side surface S3 of the second lens element E2 is concave at the optical axis, and an image-side surface S4 of the second lens element E2 is also concave at the optical axis; the third lens element E3 has positive refractive power, an object-side surface S5 of the third lens element E3 is convex on an optical axis, and an image-side surface S6 of the third lens element E3 is also convex on the optical axis; the fourth lens element E4 has positive focal power, an object-side surface S7 of the fourth lens element E4 is convex at an optical axis, and an image-side surface S8 of the fourth lens element E4 is also convex at the optical axis; the fifth lens element E5 has negative focal power, an object-side surface S9 of the fifth lens element E5 is concave at the optical axis, and an image-side surface S10 of the fifth lens element E5 is also concave at the optical axis; the sixth lens element E6 has positive refractive power, an object-side surface S11 of the sixth lens element E6 is convex on an optical axis, and an image-side surface S12 of the sixth lens element E6 is concave on the optical axis; the protective glass E7 has a first surface S13 facing the sixth lens E6 and a second surface S14 facing away from the sixth lens E6, both planar.
When light passes through the optical lens assembly 100, light from an object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.
In this embodiment, the refractive index and abbe number of each lens are referenced to light with a wavelength of 587.5618nm, the focal length is referenced to light with a wavelength of 656.2725nm, and relevant parameters of each lens of the optical lens assembly 100 are shown in table 1. Wherein EFL represents an effective focal length of the optical lens assembly 100, FNO represents an aperture value of the optical lens assembly 100, HFOV represents a maximum half field angle in a diagonal direction of the optical lens assembly 100, and TTL represents an optical total length of the optical lens assembly 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.
TABLE 1
The image side surface S4 of the second lens E2 and the object side surface S5 of the third lens E3 are cemented to form a same surface, which is represented by a surface number 4 in table 1; an image side surface S8 of the fourth lens element E4 and an object side surface S9 of the fifth lens element E5 are bonded to form a same surface, which is represented by a surface number 8 in table 1.
In table 1, the numerical value of the radius of curvature of the object-side surface S1 at the optical axis is 28.337, which indicates that the radius of curvature of the object-side surface S1 of the first lens element E1 is positive (i.e. the object-side surface S1 of the first lens element E1 facing the object side of the optical lens assembly 100 is convex). The numerical value of the radius of curvature of the image-side surface S2 at the optical axis in table 1 is 5.161, which indicates that the radius of curvature of the image-side surface S2 of the first lens element E1 is positive (i.e. the image-side surface S2 of the first lens element E1 facing the image side of the optical lens assembly 100 is concave). In table 1, the thickness value corresponding to the object-side surface S1 is 1.800, which is represented as the distance from the object-side surface S1 to the image-side surface S2 of the first lens element E1 on the optical axis, and it can also be understood that the central thickness of the first lens element E1 on the optical axis is 1.800mm. The thickness value corresponding to the image-side surface S2 in table 1 is 4.176, which means that the distance from the image-side surface S2 of the first lens element E1 to the object-side surface S3 of the second lens element E2 along the optical axis is 4.176mm, and it can also be understood that the air gap between the first lens element E1 and the second lens element E2 along the optical axis is 4.176mm. The refractive index of the first lens E1 is 1.52, and the Abbe number of the first lens E1 is 64.21. The above description only lists the data of the first lens E1, the understanding of the table data of the second lens E2 to the sixth lens E6 and the protective lens E7 is the same as that of the first lens E1, and the table content understanding manner of the following second to fifth embodiments is the same as that of the first embodiment, so the description thereof is omitted.
In this embodiment, the numerical relationship between the parameters of the optical lens assembly 100 is shown in table 2.
TABLE 2
| Relation formula | Numerical value | Relation formula | Numerical value |
| SD11/SD62 | 1.351 | f1/CT1 | -6.959 |
| f23/f | 2.702 | f45/f | 6.849 |
| CT6/ET6 | 1.611 | ImgH/FNO(mm) | 2.894 |
| DOS/TTL | 0.415 | HFOV(deg) | 35° |
As can be seen from the results in table 2, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in this embodiment respectively satisfy the numerical ranges defined by the above relationships in a one-to-one correspondence manner.
In the first embodiment of the present invention, the aspheric surface type X of the sixth lens E6 can be defined by, but is not limited to, the following aspheric surface formula:
it should be noted that, in the above formula, the symbol ". Indicate that the formula further includes a plurality of addition terms, specifically," a 8 r 8 +A 10 r 10 +A 12 r 12 +A 14 r 14 +A 16 r 16 +A 18 r 18 ”。
Where Z denotes a height in parallel with the Z axis in the lens surface, r denotes a radial distance from the vertex, c denotes a curvature of the surface at the vertex, K denotes a conic constant, and A4, A6, A8, a10, a12, a14, a16, a18, and a20 denote aspheric coefficients of orders corresponding to 4 th, 6 th, 8 th, 10 th, 12 th, 14 th, 16 th, 18 th, and 20 th orders, respectively. Table 3 below gives the coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the high-order terms that can be used for the mirror surfaces S11 and S12 of the sixth lens E6 described in example one.
TABLE 3
Referring to fig. 2, fig. 2 shows a spherical aberration curve, an astigmatism curve and a distortion curve from left to right, respectively, in a first embodiment.
The abscissa of the spherical aberration curve represents the focus offset, the ordinate represents the normalized field of view, and the wavelengths given in the left diagram of fig. 2 are within ± 0.05mm when 940.0000nm, 750.0000nm, 656.2725nm, 587.5618nm, and 468.1227nm, respectively, which indicates that in this embodiment, the optical lens assembly 100 can be used in both the visible light band and the near-infrared band, that is, day-night confocal may be achieved, and the optical lens assembly 100 has a small spherical aberration and a good imaging quality.
The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve given by the middle graph of fig. 2 represents that the focus offsets of the sagittal image plane (see the curve S) and the meridional image plane (see the curve T) are within ± 0.1mm when the wavelength is 656.2725nm, which indicates that the optical lens assembly 100 in the embodiment has smaller astigmatism and better imaging quality.
The abscissa of the distortion curve represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph of fig. 2 represents that the distortion is within ± 8% when the wavelength is 656.2725nm, which indicates that the distortion of the optical lens group 100 in this embodiment is better corrected and the imaging quality is better.
As shown in fig. 2, the optical lens assembly 100 according to the first embodiment can achieve a good imaging effect.
Example two
Referring to fig. 3, a schematic structural diagram of an optical lens assembly 100 according to a second embodiment of the present invention is shown. As shown in fig. 3, along an optical axis from an object side to an image side, the optical lens assembly 100 sequentially includes: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.
The first lens element E1 has negative focal power, an object-side surface S1 of the first lens element E1 is a convex surface on an optical axis, and an image-side surface S2 of the first lens element E1 is a concave surface on the optical axis; the second lens element E2 has negative focal power, an object-side surface S3 of the second lens element E2 is concave at the optical axis, and an image-side surface S4 of the second lens element E2 is also concave at the optical axis; the third lens element E3 has positive refractive power, an object-side surface S5 of the third lens element E3 is convex on an optical axis, and an image-side surface S6 of the third lens element E3 is also convex on the optical axis; the fourth lens element E4 has positive focal power, an object-side surface S7 of the fourth lens element E4 is convex on an optical axis, and an image-side surface S8 of the fourth lens element E4 is also convex on the optical axis; the fifth lens element E5 has positive focal power, an object-side surface S9 of the fifth lens element E5 is concave at an optical axis, and an image-side surface S10 of the fifth lens element E5 is convex at the optical axis; the sixth lens element E6 has negative focal power, an object-side surface S11 of the sixth lens element E6 is convex at an optical axis, and an image-side surface S12 of the sixth lens element E6 is concave at the optical axis; the protective glass E7 has a first surface S13 facing the sixth lens E6 and a second surface S14 facing away from the sixth lens E6, both planar.
When light passes through the optical lens assembly 100, light from an object sequentially passes through the surfaces S1 to S14 and is finally imaged on the image plane S15.
In this embodiment, the refractive index and abbe number of each lens are referenced to light with a wavelength of 587.5618nm, the focal length is referenced to light with a wavelength of 656.2725nm, and relevant parameters of each lens of the optical lens assembly 100 are shown in table 4. Wherein EFL represents an effective focal length of the optical lens assembly 100, FNO represents an aperture value of the optical lens assembly 100, HFOV represents a maximum half field angle in a diagonal direction of the optical lens assembly 100, and TTL represents an optical total length of the optical lens assembly 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.
TABLE 4
In this embodiment, the calculation results of the numerical relationship between the related parameters of the lenses of the optical lens assembly 100 are shown in table 5.
TABLE 5
| Relation formula | Numerical value | Relation formula | Numerical value |
| SD11/SD62 | 2.277 | f1/CT1 | -44.048 |
| f23/f | 56.576 | f45/f | 1.557 |
| CT6/ET6 | 0.840 | ImgH/FNO(mm) | 2.894 |
| DOS/TTL | 0.572 | HFOV(deg) | 35° |
As can be seen from the results in table 5, the numerical relationship calculation results of the lens parameters of the optical lens assembly 100 in this embodiment satisfy the numerical ranges defined by the above relations one by one.
In the second embodiment of the present invention, the aspheric surface type X of the sixth lens E6 can be defined by the aspheric surface formula in the first embodiment. Table 6 below gives the coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the high-order terms that can be used for the mirror surfaces S11 and S12 of the sixth lens E6 described in example two.
TABLE 6
Referring to fig. 4, fig. 4 shows, from left to right, a spherical aberration curve, an astigmatism curve and a distortion curve of the second embodiment, respectively.
The abscissa of the spherical aberration curve represents the focus offset, the ordinate represents the normalized field of view, and the wavelengths given in the left diagram of fig. 4 are respectively 940.0000nm, 750.0000nm, 656.2725nm, 587.5618nm and 468.1227nm, and the focus offsets of different fields of view are all within ± 0.08mm, which indicates that the optical lens assembly 100 in this embodiment can be used in both the visible light band and the near infrared band, i.e. day and night confocal is achieved, and the optical lens assembly 100 has small spherical aberration and good imaging quality.
The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve given by the middle graph of fig. 4 represents that the focus offsets of the sagittal image plane (see the curve S) and the meridional image plane (see the curve T) are within ± 0.1mm when the wavelength is 656.2725nm, which indicates that the optical lens assembly 100 in the embodiment has smaller astigmatism and better imaging quality.
The abscissa of the distortion curve represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph of fig. 4 represents that the distortion is within ± 8% when the wavelength is 656.2725nm, which indicates that the distortion of the optical lens group 100 in the embodiment is better corrected and the imaging quality is better.
As can be seen from fig. 4, the optical lens group 100 according to the second embodiment can achieve a good imaging effect.
EXAMPLE III
Referring to fig. 5, a schematic structural diagram of an optical lens assembly 100 according to a third embodiment of the invention is shown. As shown in fig. 5, along an optical axis from an object side to an image side, the optical lens assembly 100 sequentially includes: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.
The first lens element E1 has negative focal power, an object-side surface S1 of the first lens element E1 is a convex surface on an optical axis, and an image-side surface S2 of the first lens element E1 is a concave surface on the optical axis; the second lens element E2 has negative focal power, an object-side surface S3 of the second lens element E2 is concave at the optical axis, and an image-side surface S4 of the second lens element E2 is also concave at the optical axis; the third lens element E3 has positive refractive power, an object-side surface S5 of the third lens element E3 is convex on an optical axis, and an image-side surface S6 of the third lens element E3 is also convex on the optical axis; the fourth lens element E4 has positive focal power, an object-side surface S7 of the fourth lens element E4 is convex at an optical axis, and an image-side surface S8 of the fourth lens element E4 is also convex at the optical axis; the fifth lens element E5 has negative focal power, an object-side surface S9 of the fifth lens element E5 is concave at an optical axis, and an image-side surface S10 of the fifth lens element E5 is convex at the optical axis; the sixth lens element E6 has positive focal power, an object-side surface S11 of the sixth lens element E6 is convex at an optical axis, and an image-side surface S12 of the sixth lens element E6 is concave at the optical axis; the protective glass E7 has a first surface S13 facing the sixth lens E6 and a second surface S14 facing away from the sixth lens E6, both planar.
When light passes through the optical lens assembly 100, light from an object sequentially passes through the surfaces S1 to S14 and is finally imaged on the image plane S15.
In this embodiment, the refractive index and abbe number of each lens are referenced to light with a wavelength of 587.5618nm, the focal length is referenced to light with a wavelength of 656.2725nm, and relevant parameters of each lens of the optical lens assembly 100 are shown in table 7. Wherein EFL represents an effective focal length of the optical lens assembly 100, FNO represents an aperture value of the optical lens assembly 100, HFOV represents a maximum half field angle of the optical lens assembly 100 in a diagonal direction, and TTL represents an optical total length of the optical lens assembly 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.
TABLE 7
In this embodiment, the numerical relationship calculation results of the lens parameters of the optical lens assembly 100 are shown in table 8.
TABLE 8
As can be seen from the results in table 8, the numerical relationship calculation results of the lens parameters of the optical lens assembly 100 in this embodiment satisfy the numerical ranges defined by the above relations one by one.
In a third embodiment of the present invention, the aspheric surface type X of the sixth lens element E6 can be defined by the aspheric surface formula in the first embodiment. Table 9 below shows the coefficients of higher-order terms A4, A6, A8, a10, a12, a14, a16, a18, and a20 that can be used for the mirror surfaces S11 and S12 of the sixth lens E6 described in example three.
TABLE 9
Referring to fig. 6, fig. 6 shows, from left to right, a spherical aberration curve, an astigmatism curve and a distortion curve of the second embodiment.
The abscissa of the spherical aberration curve represents the focus offset, the ordinate represents the normalized field of view, and the wavelengths given in the left diagram of fig. 6 are within ± 0.05mm when 940.0000nm, 750.0000nm, 656.2725nm, 587.5618nm, and 468.1227nm, respectively, which indicates that in this embodiment, the optical lens assembly 100 can be used in both the visible light band and the near-infrared band, that is, day-night confocal may be achieved, and the optical lens assembly 100 has a small spherical aberration and a good imaging quality.
The abscissa of the astigmatism graph represents the focus offset, the ordinate of the astigmatism graph represents the field angle, and the astigmatism curve given by the middle graph of fig. 6 represents that the focus offsets of the sagittal image plane (see the curve S) and the meridional image plane (see the curve T) are within ± 0.08mm when the wavelength is 656.2725nm, which indicates that the astigmatism of the optical lens group 100 in the embodiment is small and the imaging quality is good.
The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph of fig. 6 represents that the distortion is within ± 10% when the wavelength is 656.2725nm, which indicates that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.
As can be seen from fig. 6, the optical lens group 100 according to the third embodiment can achieve a good imaging effect.
Example four
Referring to fig. 7, a schematic structural diagram of an optical lens assembly 100 according to a fourth embodiment of the present invention is shown. As shown in fig. 7, along the optical axis from the object side to the image side, the optical lens assembly 100 sequentially comprises: a first lens E1, a second lens E2, a third lens E3, an aperture stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.
The first lens element E1 has negative focal power, an object-side surface S1 of the first lens element E1 is a convex surface on an optical axis, and an image-side surface S2 of the first lens element E1 is a concave surface on the optical axis; the second lens element E2 has negative focal power, an object-side surface S3 of the second lens element E2 is concave at the optical axis, and an image-side surface S4 of the second lens element E2 is also concave at the optical axis; the third lens element E3 has positive refractive power, an object-side surface S5 of the third lens element E3 is convex on an optical axis, and an image-side surface S6 of the third lens element E3 is also convex on the optical axis; the fourth lens element E4 has positive focal power, an object-side surface S7 of the fourth lens element E4 is convex at an optical axis, and an image-side surface S8 of the fourth lens element E4 is also convex at the optical axis; the fifth lens element E5 has negative focal power, an object-side surface S9 of the fifth lens element E5 is concave at the optical axis, and an image-side surface S10 of the fifth lens element E5 is also concave at the optical axis; the sixth lens element E6 has positive refractive power, an object-side surface S11 of the sixth lens element E6 is convex on an optical axis, and an image-side surface S12 of the sixth lens element E6 is concave on the optical axis; the protective glass E7 has a first surface S13 facing the sixth lens E6 and a second surface S14 facing away from the sixth lens E6, both planar.
When light passes through the optical lens assembly 100, light from an object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.
In this embodiment, the refractive index and abbe number of each lens are referenced to light with a wavelength of 587.5618nm, the focal length is referenced to light with a wavelength of 656.2725nm, and relevant parameters of each lens of the optical lens assembly 100 are shown in table 10. Wherein EFL represents an effective focal length of the optical lens assembly 100, FNO represents an aperture value of the optical lens assembly 100, HFOV represents a maximum half field angle in a diagonal direction of the optical lens assembly 100, and TTL represents an optical total length of the optical lens assembly 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.
TABLE 10
In this embodiment, the calculation results of the numerical relationship between the related parameters of the lenses of the optical lens assembly 100 are shown in table 11.
TABLE 11
| Relation formula | Numerical value | Relation formula | Numerical value |
| SD11/SD62 | 1.985 | f1/CT1 | -14.642 |
| f23/f | 3.080 | f45/f | 79.861 |
| CT6/ET6 | 1.293 | ImgH/FNO(mm) | 2.442 |
| DOS/TTL | 0.536 | HFOV(deg) | 46.088° |
As can be seen from the results in table 11, the numerical relationship calculation results of the lens parameters of the optical lens assembly 100 in this embodiment satisfy the numerical ranges defined by the above relations one by one.
In a fourth embodiment of the present invention, the aspheric surface type X of the sixth lens element E6 can be defined by the aspheric surface formula in the first embodiment. Table 12 below gives the coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the high-order terms that can be used for the mirror surfaces S11 and S12 of the sixth lens E6 described in example three.
TABLE 12
Referring to fig. 8, fig. 8 shows a spherical aberration graph, an astigmatism graph and a distortion graph from left to right, respectively, in an embodiment.
The abscissa of the spherical aberration curve represents the focus offset, the ordinate represents the normalized field of view, and the wavelengths given in the left diagram of fig. 8 are respectively 940.0000nm, 750.0000nm, 656.2725nm, 587.5618nm and 468.1227nm, the focus offsets of different fields of view are all within ± 0.03mm, which indicates that the optical lens assembly 100 in this embodiment can be used in both the visible light band and the near infrared band, i.e. day and night confocal is achieved, and the optical lens assembly 100 has small spherical aberration and good imaging quality.
The abscissa of the astigmatism graph represents the focus offset, the ordinate of the astigmatism graph represents the field angle, and the astigmatism curve given by the middle graph of fig. 6 represents that the focus offsets of the sagittal image plane (see the curve S) and the meridional image plane (see the curve T) are within ± 0.1mm when the wavelength is 656.2725nm, which indicates that the astigmatism of the optical lens group 100 in the embodiment is small and the imaging quality is good.
The abscissa of the distortion curve graph represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph of fig. 6 represents that the distortion is within ± 25% when the wavelength is 656.2725nm, which indicates that the distortion of the optical lens group 100 in this embodiment is better corrected and the imaging quality is better.
As can be seen from fig. 8, the optical lens group 100 according to the fourth embodiment can achieve good imaging effect.
EXAMPLE five
Referring to fig. 9, a schematic structural diagram of an optical lens assembly 100 according to a fifth embodiment of the present invention is shown. As shown in fig. 9, along an optical axis from an object side to an image side, the optical lens assembly 100 sequentially includes: a first lens E1, a second lens E2, a third lens E3, a stop ST, a fourth lens E4, a fifth lens E5, a sixth lens E6, a protective mirror E7, and an image forming surface S15.
The first lens element E1 has negative focal power, an object-side surface S1 of the first lens element E1 is a convex surface at an optical axis, and an image-side surface S2 of the first lens element E1 is a concave surface at the optical axis; the second lens element E2 has negative focal power, an object-side surface S3 of the second lens element E2 is concave at the optical axis, and an image-side surface S4 of the second lens element E2 is also concave at the optical axis; the third lens element E3 has positive refractive power, an object-side surface S5 of the third lens element E3 is convex on an optical axis, and an image-side surface S6 of the third lens element E3 is also convex on the optical axis; the fourth lens element E4 has positive focal power, an object-side surface S7 of the fourth lens element E4 is convex at an optical axis, and an image-side surface S8 of the fourth lens element E4 is also convex at the optical axis; the fifth lens element E5 has negative focal power, an object-side surface S9 of the fifth lens element E5 is concave at the optical axis, and an image-side surface S10 of the fifth lens element E5 is also concave at the optical axis; the sixth lens element E6 has positive focal power, an object-side surface S11 of the sixth lens element E6 is convex at an optical axis, and an image-side surface S12 of the sixth lens element E6 is concave at the optical axis; the protective glass E7 has a first surface S13 facing the sixth lens E6 and a second surface S14 facing away from the sixth lens E6, both planar.
When light passes through the optical lens assembly 100, light from an object passes through the surfaces S1 to S14 in sequence and is finally imaged on the imaging surface S15.
In this embodiment, the refractive index and the abbe number of each lens are referenced to a light ray with a wavelength of 587.5618nm, the focal length is referenced to a light ray with a wavelength of 656.2725nm, and the relevant parameters of each lens of the optical lens assembly 100 are shown in table 13. Wherein EFL represents an effective focal length of the optical lens assembly 100, FNO represents an aperture value of the optical lens assembly 100, HFOV represents a maximum half field angle in a diagonal direction of the optical lens assembly 100, and TTL represents an optical total length of the optical lens assembly 100. It should be noted that the focal length, radius of curvature, and thickness are all in millimeters.
Watch 13
In this embodiment, the numerical relationship between the parameters of the optical lens assembly 100 is shown in table 14.
TABLE 14
| Relation formula | Numerical value | Relation formula | Numerical value |
| SD11/SD62 | 1.378 | f1/CT1 | -8.056 |
| f23/f | 2.648 | f45/f | 6.925 |
| CT6/ET6 | 1.454 | ImgH/FNO(mm) | 2.646 |
| DOS/TTL | 0.419 | HFOV(deg) | 31.833° |
As can be seen from the results in table 14, the calculation results of the numerical relationships between the lens parameters of the optical lens assembly 100 in the present embodiment respectively satisfy the numerical ranges defined by the above relationships in a one-to-one correspondence manner.
In a fifth embodiment of the present invention, the aspheric surface type X of the sixth lens E6 can be defined by the aspheric surface formula in the first embodiment. Table 15 below gives the coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the high-order terms that can be used for the mirror surfaces S11 and S12 of the sixth lens E6 described in example five.
Watch 15
Referring to fig. 10, fig. 10 shows a spherical aberration graph, an astigmatism graph and a distortion graph from left to right, respectively, in the fifth embodiment.
The abscissa of the spherical aberration curve represents the focus offset, the ordinate represents the normalized field of view, and the wavelengths given in the left diagram of fig. 10 are within ± 0.05mm when 940.0000nm, 750.0000nm, 656.2725nm, 587.5618nm, and 468.1227nm, respectively, which indicates that in this embodiment, the optical lens assembly 100 can be used in both the visible light band and the near-infrared band, that is, it can achieve day-night confocal, and the optical lens assembly 100 has a small spherical aberration and a good imaging quality.
The abscissa of the astigmatism graph represents the focus offset, the ordinate represents the field angle, and the astigmatism curve given by the middle graph of fig. 10 represents that the focus offsets of the sagittal image plane (see the curve S) and the meridional image plane (see the curve T) are within ± 0.1mm when the wavelength is 656.2725nm, which indicates that the optical lens assembly 100 in the embodiment has smaller astigmatism and better imaging quality.
The abscissa of the distortion curve represents the distortion rate, the ordinate represents the field angle, and the distortion curve given by the right graph of fig. 10 represents that the distortion is within ± 5% when the wavelength is 656.2725nm, which indicates that the distortion of the optical lens assembly 100 in this embodiment is better corrected and the imaging quality is better.
As can be seen from fig. 10, the optical lens group 100 according to the fifth embodiment can achieve good imaging effect.
It should be noted that the same or similar reference numerals in the drawings of the above embodiments correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by the terms "upper", "lower", etc. based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present application and simplifying the 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 limiting the present patent, and the specific meaning of the above terms will be understood by those skilled in the art according to the specific situation.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. An optical lens assembly 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;
wherein the first lens and the second lens have negative focal power, the third lens and the fourth lens have positive focal power, the fifth lens and the sixth lens have opposite focal power, and both the object-side surface of the fifth lens and the image-side surface of the sixth lens are concave surfaces;
the maximum effective semi-aperture of the object side surface of the first lens is defined as SD11, the maximum effective semi-aperture of the image side surface of the sixth lens is defined as SD62, and the SD11 and the SD62 satisfy the relation: 1.3 < SD11/SD62 < 2.3;
the radius of an effective imaging circle of the optical lens group is defined as ImgH, the f-number of the optical lens group is defined as FNO, and the ImgH and the FNO satisfy the relation: 1.8mm-lined imgh/FNO <3mm.
2. The optical lens assembly of claim 1 wherein the effective focal length of said optical lens assembly is defined as f and the combined focal length of said second and third lenses is defined as f23;
wherein f23 and f satisfy the relation: 2.5 < f23/f < 60.
3. The optical lens assembly of claim 1, wherein an effective focal length of the optical lens assembly is defined as f, and a combined focal length of the fourth lens element and the fifth lens element is defined as f45;
wherein f45 and f satisfy the relation: f45/f is more than 1.5 and less than 80.
4. The optical lens assembly as claimed in claim 1, wherein the thickness of said first lens element along said optical axis is defined as CT1, and the focal length of said first lens element is defined as f1;
wherein f1 and CT1 satisfy the relation: -45 < f1/CT1 < -6.5.
5. The optical lens assembly of claim 1, wherein the thickness of the sixth lens element along the optical axis is defined as CT6, and the distance from the maximum effective diameter of the object-side surface of the sixth lens element to the maximum effective diameter of the image-side surface of the sixth lens element along the direction parallel to the optical axis is defined as ET6;
wherein, CT6 and ET6 satisfy the relation: CT6/ET6 is more than 0.8 and less than 1.7.
6. The optical lens assembly of claim 1 wherein the maximum half field angle of the optical lens assembly is defined as HFOV, which satisfies the relationship: 25 DEG < HFOV < 50 deg.
7. The optical lens assembly of claim 1 further comprising a stop, wherein a distance from an object-side surface of the first lens element to the stop on the optical axis is defined as DOS, and an overall optical length of the optical lens assembly is defined as TTL;
wherein, DOS and TTL satisfy the relation: DOS/TTL is more than 0.4 and less than 0.6.
8. A lens module comprising a light-sensitive element and the optical lens assembly of any one of claims 1-7, wherein a light-sensitive surface of the light-sensitive element is located on an image plane of the optical lens assembly.
9. An electronic device comprising a housing and the lens module as recited in claim 8, wherein the lens module is disposed in the housing.
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| JP6194134B1 (en) * | 2017-05-11 | 2017-09-06 | エーエーシーアコースティックテクノロジーズ（シンセン）カンパニーリミテッドＡＡＣ Ａｃｏｕｓｔｉｃ Ｔｅｃｈｎｏｌｏｇｉｅｓ（Ｓｈｅｎｚｈｅｎ）Ｃｏ．，Ｌｔｄ | Imaging lens |
| CN109212722B (en) * | 2018-11-27 | 2024-04-23 | 浙江舜宇光学有限公司 | Optical lens group |
| CN112230370A (en) * | 2020-10-23 | 2021-01-15 | 江西晶超光学有限公司 | Optical lens, camera module and electronic device |
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| CN212540860U (en) * | 2020-09-07 | 2021-02-12 | 天津欧菲光电有限公司 | Optical lens assembly, lens module and electronic equipment |
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