CN115407488A - Optical lens, camera module and electronic equipment - Google Patents
Optical lens, camera module and electronic equipment Download PDFInfo
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- CN115407488A CN115407488A CN202211061080.2A CN202211061080A CN115407488A CN 115407488 A CN115407488 A CN 115407488A CN 202211061080 A CN202211061080 A CN 202211061080A CN 115407488 A CN115407488 A CN 115407488A
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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
- G02B13/06—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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Abstract
The invention discloses an optical lens, a camera module and electronic equipment, wherein the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens; the first lens element with positive refractive power, the second lens element with negative refractive power, the third lens element to the sixth lens element with refractive power, the seventh lens element with positive refractive power, the eighth lens element with negative refractive power, and the optical lens assembly satisfy the following relations: 1.63 woven fabric (f/D woven fabric) 1.7,1.0 and all-through Imgh/f <1.1; and f is the focal length of the optical lens, D is the entrance pupil diameter of the optical lens, and Imgh is the radius of the maximum effective imaging circle on the imaging surface of the optical lens. The optical lens, the camera module and the electronic equipment provided by the invention can realize the miniaturization design of the optical lens, improve the image quality of the shooting of the optical lens, improve the resolution and definition of the optical lens and achieve the shooting effect of high pixels.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to an optical lens, a camera module and electronic equipment.
Background
In recent years, with the upgrading of technology, consumers have increasingly high requirements for the imaging quality of portable electronic devices, such as mobile phones, and thus, the camera module mounted on the portable electronic device is facing more and more challenges. On one hand, portable electronic devices exhibit a trend toward slimness, which requires further compression of the optical lens in axial dimension; on the other hand, it is also necessary to ensure that the optical lens satisfies the miniaturization design while simultaneously achieving higher imaging quality. Therefore, how to configure the number, refractive power, and surface shape of the lenses in the optical lens to achieve a compact design while maintaining good imaging quality is still a technical problem to be solved in the optical imaging technology field.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, a camera module and electronic equipment, which can improve the image quality of shooting by the optical lens while realizing the miniaturization design of the optical lens, improve the resolution and definition of the optical lens and achieve the shooting effect of high pixels.
In order to achieve the above object, a first aspect of the present invention discloses an optical lens, which has eight lenses, wherein the eight lenses are, in order from an object side to an image side along an optical axis, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the second lens element with negative refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element with refractive power has a convex image-side surface at paraxial region;
the fourth lens element with refractive power has a concave object-side surface at paraxial region;
the fifth lens element with refractive power has a concave object-side surface at a paraxial region thereof and a convex image-side surface at a paraxial region thereof;
the sixth lens element with refractive power has a concave image-side surface at a paraxial region;
the seventh lens element with positive refractive power has a convex object-side surface at paraxial region;
the eighth lens element with negative refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the optical lens satisfies the following relational expression:
1.63<f/D<1.7；
1.0<Imgh/f<1.1；
wherein f is the focal length of the optical lens, D is the entrance pupil diameter of the optical lens, and Imgh is the radius of the maximum effective imaging circle on the imaging surface of the optical lens, that is, the half-image height of the optical lens.
In the optical lens system provided by the application, the first lens element has a strong positive refractive power, and the object side surface is convex at the optical axis and the image side surface is concave at the paraxial region, so that the space of the optical lens system can be effectively utilized, the optical lens system is light and thin and miniaturized, and the first lens element is favorable for ensuring sufficient light convergence capability. The second lens can provide negative refractive power for the optical lens, which is beneficial to expanding the width of a light ray bundle, so that the light rays of large-angle light rays after being refracted and converged by the first lens are effectively expanded, the optical performance of the optical lens is improved, and meanwhile, the first lens with positive refractive power is matched, which is beneficial to correcting the on-axis spherical aberration of the optical lens. The convex surface design of the third lens element at the paraxial region thereof and the concave surface design of the fourth lens element at the optical axis thereof can correct spherical aberration well. The object side surface and the image side surface of the fifth lens are respectively a concave surface and a convex surface at the optical axis, so that the influence of high-grade astigmatism on the optical lens is favorably reduced; the image side surface of the sixth lens element is concave at the paraxial region and the object side surface of the seventh lens element is convex at the paraxial region, so that curvature of field and distortion of the optical lens assembly can be effectively corrected; the convex-concave surface type design of the object side surface and the image side surface of the eighth lens at the optical axis can reduce the assembly sensitivity of the optical lens, and is beneficial to the engineering manufacture of the optical lens.
That is, by selecting a proper number of lenses and reasonably configuring the refractive power and the surface type of each lens, the miniaturization design of the optical lens can be realized, and meanwhile, the detailed information of an object can be captured well, the detailed capability of the optical lens for capturing the shot object can be improved, the image quality sense of the optical lens can be improved, the resolution and the imaging definition of the optical lens can be improved, so that the optical lens can have a better imaging effect to meet the high-definition imaging requirement of people on the optical lens; and further causing the optical lens to satisfy the following relational expression: 1.6 fewer f/D <1.7 and 1.0 fewer Imgh/f <1.1, the focal length of the optical lens, the entrance pupil diameter of the optical lens and the half-image height of the optical lens can be reasonably configured, which is beneficial to enabling the optical lens to have a larger aperture and a smaller total optical length, and simultaneously can also ensure the wide-angle characteristic of the optical lens, is beneficial to enlarging the light entering range of the field of view of the optical lens, and increases the light beam entering the optical lens, so that the optical lens has a larger light entering amount, thereby ensuring that enough light can be converged and imaged on an imaging surface, improving the brightness of the imaged image, further enabling the imaged image to be clearer, and realizing the wide-angle shooting effect of high definition; the large light inlet quantity is convenient for capturing details of a shot object well, and is beneficial to obtaining a large field angle so as to realize wide-angle design and reduce the deflection angle of emergent light at the same time, thereby lightening a dark angle, inhibiting distortion and improving the imaging resolution of the optical lens. In addition, the larger diameter of the entrance pupil is beneficial to the entrance of large-angle light rays into the optical lens, so that the optical lens has a large field angle range, sufficient object space information can be obtained, and the imaging quality is improved. When the light quantity exceeds the upper limit of the relational expression, the aperture of the optical lens is easy to be too small, which is not beneficial to obtaining enough light inlet quantity in a dark shooting environment, so that the brightness of an imaging surface is reduced, and the imaging quality is not high; when the distance is less than the lower limit of the above relational expression, the focal length of the optical lens is too small, so that the design requirement of the field angle range of the optical lens is difficult to meet, and sufficient object space information cannot be obtained, so that the imaging information is lost, and the shooting quality of the optical lens is influenced.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 1.1 and then straw TTL/Imgh is less than 1.21; wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical lens, i.e., an optical total length of the optical lens, and Imgh is a radius of a maximum effective imaging circle on the imaging surface of the optical lens, i.e., a half-image height of the optical lens. When the relation is satisfied, by controlling the ratio of the total optical length to the half-image height of the optical lens within a reasonable range, the total optical length of the optical lens can be effectively controlled on the premise that the optical lens has a larger field angle and an image plane, so that the optical lens has a more compact structure, has an ultrathin characteristic, meets the design requirement of miniaturization, can be better carried on light and thin electronic equipment, and can be compatible with a large-sized photosensitive chip, thereby being beneficial to improving the imaging quality of the electronic equipment. When the optical total length of the optical lens exceeds the upper limit of the relational expression, the thickness of the optical lens in the optical axis direction is increased, the light, thin and small design of the optical lens is not facilitated, and meanwhile, the size of an imaging surface of the optical lens is too small, so that a dark angle phenomenon is easily generated, imaging information is lost, and the imaging quality is reduced; when the lower limit of the above relation is lower, the total optical length of the optical lens is too small, which is not favorable for lens arrangement and reduces the assembly efficiency of the optical lens.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 2.7< | R7/f | <2.8; wherein R7 is a curvature radius of an object-side surface of the fourth lens element on an optical axis. By satisfying the above relational expression, the ratio of the curvature radius of the object side surface of the fourth lens element to the focal length of the optical lens element can be controlled within a certain range, so that the refractive power of the fourth lens element can be controlled within a reasonable range, and the spherical aberration of the optical lens element can be effectively balanced, so that the optical lens element has good imaging quality. When the absolute value of the curvature radius of the object-side surface of the fourth lens element at the optical axis is smaller than the lower limit of the conditional expression, the surface shape of the fourth lens element at the position near the optical axis is too curved, the sensitivity of the fourth lens element is increased, and the engineering manufacture of the fourth lens element is not facilitated, or the optical total length of the optical lens element is difficult to compress due to too long focal length of the optical lens element, so that the volume of the optical lens element is increased, and the optical lens element is not favorable for meeting the miniaturization design requirement; on the other hand, if the upper limit of the conditional expression is exceeded, the absolute value of the radius of curvature of the object-side surface of the fourth lens element at the optical axis becomes large, so that the surface shape of the fourth lens element at the paraxial region becomes too gentle, and it becomes difficult to sufficiently correct astigmatism, curvature of field, and distortion.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 5.8< | R6/f | <6.2; wherein R6 is a curvature radius of an image-side surface of the third lens element on an optical axis. By satisfying the above relational expression, the ratio of the curvature radius of the image side surface of the third lens element to the focal length of the optical lens element can be controlled within a certain range, so that the refractive power of the third lens element can be controlled within a reasonable range, and the spherical aberration of the optical lens element can be effectively balanced, so that the optical lens element has good imaging quality. When the absolute value of the curvature radius of the image-side surface of the third lens element at the optical axis is smaller than the lower limit of the conditional expression, the surface shape of the third lens element at the paraxial region is too curved, which increases the sensitivity of the third lens element and is not favorable for the engineering manufacture of the third lens element, or the focal length of the optical lens element is too long and the optical total length of the optical lens element is difficult to compress, which increases the volume of the optical lens element and is not favorable for the optical lens element to meet the miniaturization design requirement; on the other hand, if the upper limit of the conditional expression is exceeded, the absolute value of the radius of curvature of the image-side surface of the third lens element at the optical axis becomes large, and the surface shape of the third lens element at the paraxial region becomes too gentle, making it difficult to sufficiently correct astigmatism, curvature of field, and distortion.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.7-straw AT12/(AT 34+ AT 45) <0.9; AT12 is an air gap between the first lens and the second lens on the optical axis, AT34 is an air gap between the third lens and the fourth lens on the optical axis, and AT45 is an air gap between the fourth lens and the fifth lens on the optical axis. The mutual relation among the air intervals of the first lens and the second lens on the optical axis, the air intervals of the third lens and the fourth lens on the optical axis and the air intervals of the fourth lens and the fifth lens on the optical axis is reasonably set, so that the control of the air intervals of the first lens and the second lens, the air intervals of the third lens and the fourth lens and the air intervals of the fourth lens and the fifth lens are favorably in a reasonable range, the optical lens is favorably provided with enough air gap ratio, and the stability and the imaging quality of the optical lens are ensured; meanwhile, the optical total length of the optical lens can be further regulated and controlled, so that the tolerance sensitivity among the lenses can be reduced under the condition that the optical total length of the optical lens is shortened to realize miniaturization design, the assembly difficulty of each lens can be reduced, and the assembly stability of each lens can be improved; and moreover, the overall structure compactness of the optical lens is improved, so that the internal space of the optical lens can be fully utilized, the incident angle of the light beam incident to each surface is reduced, the risks of stray light and ghost image between adjacent lenses can be reduced, meanwhile, the optical lens can help to collect imaging light, improve aberration and reduce distortion, and the whole optical lens can effectively expand the field angle and maintain good imaging quality.
As an alternative implementation, in an embodiment of the first aspect of the invention, the optical lens satisfies the following relation: 0.8 and sSD11/SD 51<0.9; wherein SD11 is the maximum effective half aperture of the object-side surface of the first lens, and SD51 is the maximum effective half aperture of the object-side surface of the fifth lens. The ratio of the maximum effective half aperture of the object side surface of the first lens to the maximum effective half aperture of the object side surface of the fifth lens is controlled within a reasonable range, smooth transmission of light between the first lens and the fifth lens can be effectively realized, the influence of vignetting on the relative illumination of the marginal field of view is reduced, the imaging quality of the optical lens is ensured, and meanwhile, the radial size of the first lens can be reduced, so that the optical lens with the eight-piece type lens realizes small-head design, the opening size on a screen of equipment can be reduced, and the screen occupation ratio of the equipment is improved. In addition, when the limitation of the relational expression is satisfied, the processing and molding of the first lens and the fifth lens are facilitated, and the yield of the lenses is improved.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation:
1.6< (SD 62-SD 71)/(SD 72-SD 81) <2.1; wherein SD62 is the maximum effective half aperture of the image-side surface of the sixth lens element, SD71 is the maximum effective half aperture of the object-side surface of the seventh lens element, SD72 is the maximum effective half aperture of the image-side surface of the seventh lens element, and SD81 is the maximum effective half aperture of the object-side surface of the eighth lens element. By controlling the difference value between the maximum effective half aperture of the image side surface of the sixth lens and the maximum effective half aperture of the object side surface of the seventh lens and the difference value between the maximum effective half aperture of the image side surface of the seventh lens and the maximum effective half aperture of the object side surface of the eighth lens to be within a certain range, light can smoothly pass through the rear group of lenses (namely a lens group consisting of the sixth lens, the seventh lens and the eighth lens), the deflection angle of the light among the lenses is reduced, so that the light of the marginal field can enter the object side surface of the eighth lens from the image side surface of the sixth lens with a slow change trend, marginal aberration is reduced, the risk of distortion of the optical lens is reduced, and the sensitivity of the marginal field can be reduced.
As an alternative implementation, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.9< -CT4/CT 5<1.0; wherein, CT4 is the thickness of the fourth lens element on the optical axis, and CT5 is the thickness of the fifth lens element on the optical axis. Through reasonable configuration of the central thicknesses of the fourth lens and the fifth lens, on one hand, the fourth lens and the fifth lens are prevented from being excessively bent or smoothed under the condition that the optical lens is ensured to have proper optical total length, so that the processing and forming difficulty of the fourth lens and the fifth lens is reduced, engineering manufacturing can be better realized, and the processing and manufacturing of the fourth lens and the fifth lens are facilitated; on the other hand, the refractive power relation between the fourth lens element and the fifth lens element can be effectively adjusted, so that the optical performance of the optical lens can be improved while the wide-angle and miniaturized design of the optical lens is realized; the imaging device is also favorable for reducing the emergent angle of the light rays emitted out of the optical lens, can avoid the situation that the large-angle light rays cannot be effectively converged to the imaging surface, improves the sensitivity of the photosensitive chip, is favorable for realizing the characteristics of the large image surface of the optical lens, is matched with the photosensitive chip with higher pixels, improves the imaging quality, can also ensure that the edge of the imaging surface of the optical lens can obtain higher relative brightness, and reduces the possibility of generating a dark angle by the optical lens.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, the optical lens satisfies the following relation: 0.85< -R9/R10 <1.85; wherein R9 is a curvature radius of an object-side surface of the fifth lens element on an optical axis, and R10 is a curvature radius of an image-side surface of the fifth lens element on the optical axis. When the relation is satisfied, the trend of the thickness ratio of the object side surface and the image side surface of the fifth lens element can be well controlled, so that the shape of the fifth lens element is limited, the refractive power borne by the fifth lens element in the whole optical lens can be effectively controlled, the spherical aberration contribution of the fifth lens element can be controlled within a reasonable range, the image quality of the on-axis visual field and the off-axis visual field can not be obviously degraded due to the spherical aberration contribution, the spherical aberration and the high-level coma aberration of the optical lens element can be effectively improved, and the optical performance and the imaging quality of the optical lens element can be improved; meanwhile, the processability of the shape of the fifth lens is ensured, so that the processing production of the fifth lens is ensured, and the manufacturing yield of the fifth lens is improved. When the range of the relational expression is exceeded, the surface of the fifth lens is too curved or too flat, so that the processing and forming of the fifth lens are not facilitated, and the manufacturing yield of the fifth lens cannot be ensured; meanwhile, it is not favorable for correcting the edge aberration of the optical lens, and may increase the probability of generating the ghost or increase the intensity of the ghost, which affects the imaging quality.
In a second aspect, the present invention discloses a camera module, which includes a photosensitive chip and the optical lens according to the first aspect, where the photosensitive chip is disposed on an image side of the optical lens. The camera module has the characteristic of large aperture, has larger light-entering amount compared with a five-piece type optical lens, can improve dark light shooting conditions, is suitable for shooting in dark light environments such as night scenes, rainy days, starry sky and the like, has better blurring effect, has the characteristic of large image plane, can improve the resolution of the camera module under the condition of realizing miniaturization design, improves the imaging quality of the camera module, achieves the shooting effect of high pixels, and enables the camera module to have better imaging effect.
In a third aspect, the invention further discloses an electronic device, which includes a housing and the camera module set according to the second aspect, and the camera module set is disposed on the housing. The electronic equipment with the camera module has the characteristic of large aperture, has larger light inlet amount compared with a five-piece type optical lens, can improve the dim light shooting condition, is suitable for shooting in dim light environments such as night scenes, rainy days, starry sky and the like, has better blurring effect, has the characteristic of large image plane, can improve the resolution ratio of the electronic equipment under the condition of realizing miniaturization design, improves the imaging quality of the electronic equipment, achieves the shooting effect of high pixels, and enables the electronic equipment to have better imaging effect.
Compared with the prior art, the invention has the beneficial effects that:
according to the optical lens, the camera module and the electronic equipment provided by the embodiment of the invention, the optical lens adopts eight-piece type lenses, the number of the lenses is reasonable, the structure is ingenious, and the volume is small. By selecting a proper number of lenses and reasonably configuring the refractive power and the surface type of each lens, the miniaturization design of the optical lens can be realized, and meanwhile, the detailed information of an object can be captured better, the detailed capability of the optical lens for capturing the shot object is improved, the image quality sense of the optical lens is improved, the resolution and the imaging definition of the optical lens are improved, so that the optical lens can have a better imaging effect, and the high-definition imaging requirement of people on the optical lens is met; and further causing the optical lens to satisfy the following relational expression: 1.6 & ltf/D & lt 1.7 & gt, the focal length of the optical lens and the entrance pupil diameter of the optical lens can be reasonably configured, so that the optical lens has a larger aperture and a smaller total optical length, the wide-angle characteristic of the optical lens can be ensured, and the light ray bundle entering the optical lens can be increased, so that the optical lens has a larger light inlet amount, thereby ensuring that enough light can be converged and imaged on an imaging surface, improving the brightness of the imaged image, further ensuring that the imaged image can be clearer, and realizing a high-definition wide-angle shooting effect; and great light inlet quantity also is convenient for fine the details of catching the object of shooing, improves optical lens's imaging resolution, even if use under dark light environment such as cloudy day, rainy, also can have better optical property, and the optical lens of this application can be to shooting high quality to object space scene that luminance is little such as night scene, starry sky promptly. In addition, the larger entrance pupil diameter is beneficial to large-angle light rays entering the optical lens, so that the optical lens has a large field angle range, sufficient object space information can be obtained, and the imaging quality is improved.
Drawings
In order to more clearly illustrate the technical solutions in 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 only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens disclosed in a first embodiment of the present application;
fig. 2 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in the first embodiment of the present application;
fig. 3 is a schematic structural diagram of an optical lens disclosed in a second embodiment of the present application;
fig. 4 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in a second embodiment of the present application;
fig. 5 is a schematic structural diagram of an optical lens disclosed in a third embodiment of the present application;
fig. 6 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in a third embodiment of the present application;
fig. 7 is a schematic structural diagram of an optical lens disclosed in a fourth embodiment of the present application;
fig. 8 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in a fourth embodiment of the present application;
fig. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present application;
fig. 10 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in a fifth embodiment of the present application;
fig. 11 is a schematic structural diagram of an optical lens disclosed in a sixth embodiment of the present application;
fig. 12 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical lens disclosed in a sixth embodiment of the present application;
fig. 13 is a schematic structural diagram of the camera module disclosed in the present application;
fig. 14 is a schematic structural diagram of an electronic device disclosed in the present application.
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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used in other meanings besides orientation or positional relationship, for example, the term "upper" may also be used in some cases to indicate a certain attaching or connecting relationship. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
Furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The technical solution of the present invention will be further described with reference to the following embodiments and the accompanying drawings.
Referring to fig. 1, according to a first aspect of the present application, an optical lens 100 is disclosed, where the optical lens 100 includes a first lens element L1, a second lens element L2, a third lens element L3, a fourth lens element L4, a fifth lens element L5, a sixth lens element L6, a seventh lens element L7, and an eighth lens element L8, which are disposed in order from an object side to an image side along an optical axis O. During imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 in sequence from the object side of the first lens L1, and finally forms an image on the image plane 101 of the optical lens 100. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power or negative refractive power, the fourth lens element L4 with positive refractive power or negative refractive power, the fifth lens element L5 with positive refractive power or negative refractive power, the sixth lens element L6 with positive refractive power or negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power.
Further, the object-side surface S1 of the first lens element L1 can be convex at a paraxial region, and the image-side surface S2 of the first lens element L1 can be concave at a paraxial region; the object-side surface S3 of the second lens element L2 can be convex at a paraxial region, and the image-side surface S4 of the second lens element L2 can be concave at a paraxial region; the object-side surface S5 of the third lens element L3 can be convex or concave at a paraxial region thereof, and the image-side surface S6 of the third lens element L3 can be convex at a paraxial region thereof; the object-side surface S7 of the fourth lens element L4 can be concave at the paraxial region, and the image-side surface S8 of the fourth lens element L4 can be convex or concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 can be concave at a paraxial region, and the image-side surface S10 of the fifth lens element L5 can be convex at a paraxial region; the object-side surface S11 of the sixth lens element L6 can be convex or concave at a paraxial region, and the image-side surface S12 of the sixth lens element L6 can be concave at a paraxial region; the object-side surface S13 of the seventh lens element L7 can be convex at the paraxial region, and the image-side surface S14 of the seventh lens element L7 can be concave or convex at the paraxial region; the object-side surface S15 of the eighth lens element L8 can be convex at a paraxial region, and the image-side surface S16 of the eighth lens element L8 can be concave at a paraxial region.
It is considered that the optical lens 100 is often applied to electronic devices such as a smart phone and a smart tablet, or to an in-vehicle device and a drive recorder of an automobile. When the optical lens 100 is applicable to electronic devices such as smart phones and smart tablets, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may be made of plastic, so that the optical lens 100 has a good optical effect, the overall weight of the optical lens 100 may be reduced, the optical lens 100 may have good portability, and the lens is easier to process in a complex surface shape. Meanwhile, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may be aspheric. Furthermore, it is understood that, in other embodiments, when the optical lens 100 is used as a camera on an automobile body, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8 may all be glass lenses, so that the optical lens 100 has a good optical effect and the temperature sensitivity of the optical lens 100 may also be reduced. Meanwhile, each lens can adopt a spherical surface.
In some embodiments, the optical lens 100 further includes a stop 102, and the stop 102 may be an aperture stop or a field stop, which may be disposed between the object side of the optical lens 100 and the object side surface S1 of the first lens L1. It is understood that, in other embodiments, the stop 102 may be disposed between any two lenses, for example, the stop 102 may be disposed between the image-side surface S8 of the fourth lens L4 and the object-side surface S9 of the fifth lens L5, and the setting is adjusted according to practical situations, which is not particularly limited in this embodiment.
In some embodiments, the optical lens 100 further includes an optical filter L9, for example, an infrared filter, which may be disposed between the image side surface S16 of the eighth lens element L8 and the imaging surface 101 of the optical lens 100, so as to filter out light rays in other wavelength bands, such as visible light, and only allow infrared light to pass through, so that the infrared filter is selected to filter out light rays in other wavelength bands, such as visible light, and improve imaging quality, so that imaging better conforms to visual experience of human eyes; and the optical lens 100 can be used as an infrared optical lens, that is, the optical lens 100 can image in a dark environment and other special application scenes and can obtain a better image effect. It is understood that the optical filter L9 may be made of an optical glass coating film, may also be made of colored glass, or may be a filter made of other materials, which may be selected according to actual needs, and is not limited in this embodiment.
In some embodiments, the optical lens 100 satisfies the following relationship: 1.63</D <1.7, for example f/D =1.637, 1.648, 1.663, 1.666, 1.672, 1.676, 1.680, 1.685, 1.689, 1.690 or 1.693, etc.; where f is the focal length of the optical lens 100, and D is the entrance pupil diameter of the optical lens 100. When the above relation is satisfied, the focal length of the optical lens 100 and the diameter of the entrance pupil of the optical lens 100 can be reasonably configured, which is beneficial to making the optical lens 100 have a larger aperture and a smaller total optical length, and simultaneously, the wide-angle characteristic of the optical lens 100 can be ensured, which is beneficial to increasing the light beam entering the optical lens 100, so that the optical lens 100 has a larger light entering amount, thereby ensuring that enough light can be converged and imaged on the imaging surface 101, improving the brightness of the imaged image, further making the imaged image clearer, and realizing a high-definition wide-angle shooting effect; and the greater light-incoming quantity is also convenient for fine capture of the details of the object to be shot, improves the imaging resolution of the optical lens 100, and even if the optical lens 100 is used in dark light environments such as cloudy days and raining, the optical lens 100 also has better optical performance, namely, the optical lens 100 of the application can shoot high-quality object space scenes such as night scenes and starry sky which are not high in brightness. In addition, the larger entrance pupil diameter is also beneficial for large-angle light rays to enter the optical lens 100, so that the optical lens 100 has a large field angle range, sufficient object space information can be obtained, and the imaging quality is improved. If the upper limit of the above relational expression is exceeded, the aperture of the optical lens 100 is easily too small, which is not favorable for obtaining a sufficient light entering amount in a dark shooting environment, so that the brightness of the imaging plane 101 is reduced, and the imaging quality is not high; if the distance is less than the lower limit of the above relational expression, the focal length of the optical lens 100 is too small to satisfy the design requirement of the field angle range of the optical lens 100, and sufficient object space information cannot be obtained, resulting in missing of imaging information and affecting the shooting quality of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 1.0< -Imgh/f <1.1, such as Imgh/f =1.017, 1.032, 1.047, 1.052, 1.057, 1.059, 1.060, 1.064, 1.071, 1.084, 1.087 or 1.095, etc.; where Imgh is the radius of the maximum effective imaging circle on the imaging surface 101 of the optical lens 100, i.e. the half-image height of the optical lens 100. When the above relational expression is satisfied, it is advantageous to increase the light entrance range of the field of view of the optical lens 100 and expand the field angle, so that the good optical performance of the optical lens 100 can be maintained, the high-pixel characteristic of the optical lens 100 is realized, the details of the object to be photographed can be well captured, a larger field angle can be obtained, the wide-angle design is realized, the deflection angle of the emergent light is reduced, the dark angle is reduced, the distortion is suppressed, and the shooting effect of the optical lens 100 is improved.
In some embodiments, the optical lens 100 satisfies the following relationship: 1.1 plus TTL/Imgh <1.21, e.g. TTL/Imgh =1.108, 1.122, 1.134, 1.161, 1.174, 1.201, 1.204, 1.205, 1.206, 1.207, 1.208 or 1.209 etc.; wherein, TTL is an axial distance from the object-side surface S1 of the first lens element L1 to the image plane 101 of the optical lens system 100, i.e., an optical total length of the optical lens system 100. By controlling the ratio of the total optical length to the half-image height of the optical lens 100 within a reasonable range, the total optical length of the optical lens 100 can be effectively controlled on the premise that the optical lens 100 has a larger field angle and an image plane, so that the optical lens 100 has a more compact structure and an ultrathin characteristic, and meets the design requirement of miniaturization, so that the optical lens 100 can be better carried on a light and thin electronic device, and meanwhile, the optical lens 100 can be compatible with a large-sized photosensitive chip, thereby being beneficial to improving the imaging quality of the electronic device. When the total optical length of the optical lens 100 exceeds the upper limit of the above relational expression, the thickness of the optical lens 100 in the optical axis direction is increased due to an excessively large total optical length, which is not favorable for the light, thin and miniaturized design of the optical lens 100, and meanwhile, the size of the imaging surface 101 of the optical lens 100 is excessively small, which is easy to generate a dark angle phenomenon, thereby causing loss of imaging information and reducing imaging quality; when the lower limit of the above relation is lower, the total optical length of the optical lens 100 is too small, which is not favorable for lens arrangement and reduces the assembly efficiency of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 5.8< | R6/f | <6.2, e.g., | R6/f | =5.837, 5.867, 5.947, 5.992, 6.029, 6.037, 6.051, 6.068, 6.085, 6.094, 6.142, or 6.146, etc.; wherein R6 is a curvature radius of the image-side surface S6 of the third lens element L3 on the optical axis. By satisfying the above relationship, the ratio of the curvature radius of the image-side surface S6 of the third lens element L3 to the focal length of the optical lens system 100 can be controlled within a certain range, so that the refractive power of the third lens element L3 can be controlled within a reasonable range, and the spherical aberration of the optical lens system 100 can be effectively balanced, so that the optical lens system 100 has good imaging quality. When the absolute value of the curvature radius of the image-side surface S6 of the third lens element L3 at the optical axis is smaller than the lower limit of the conditional expression, the surface of the third lens element L3 at the position near the optical axis is too curved, the sensitivity of the third lens element L3 is increased, which is not favorable for the engineering manufacture of the third lens element L3, or the focal length of the optical lens 100 is too long to compress the total optical length of the optical lens 100, which results in the volume of the optical lens 100 being increased, which is not favorable for the optical lens 100 to meet the requirement of miniaturization design; on the other hand, if the upper limit of the conditional expression is exceeded, the absolute value of the curvature radius of the image-side surface S6 of the third lens element L3 at the optical axis becomes large, and the surface shape of the third lens element L3 at the paraxial region becomes too gentle, making it difficult to sufficiently correct astigmatism, field curvature, and distortion.
In some embodiments, optical lens 100 satisfies the following relation 2.7< | R7/f | <2.8, e.g., | R7/f | =2.708, 2.717, 2.722, 2.731, 2.738, 2.743, 2.747, 2.752, 2.758, 2.761, 2.779, or the like; wherein R7 is a curvature radius of the object-side surface S7 of the fourth lens element L4 on the optical axis. By satisfying the above relational expression, the ratio of the curvature radius of the object-side surface S7 of the fourth lens element L4 to the focal length of the optical lens system 100 can be controlled within a certain range, so that the refractive power of the fourth lens element L4 can be controlled within a reasonable range, and the spherical aberration of the optical lens system 100 can be effectively balanced, so that the optical lens system 100 has good imaging quality. When the absolute value of the curvature radius of the object-side surface S7 of the fourth lens element L4 at the optical axis is smaller than the lower limit of the conditional expression, the surface shape of the fourth lens element L4 at the paraxial region is too curved, which increases the sensitivity of the fourth lens element L4 and is not favorable for the engineering manufacture of the fourth lens element L4, or the focal length of the optical lens 100 is too long to compress the total optical length of the optical lens 100, which increases the volume of the optical lens 100 and is not favorable for the optical lens 100 to meet the requirement of miniaturization design; on the other hand, if the upper limit of the conditional expression is exceeded, the absolute value of the radius of curvature of the object-side surface S7 of the fourth lens L4 at the optical axis becomes large, so that the surface shape of the fourth lens L4 at the paraxial region becomes too gentle, and it becomes difficult to sufficiently correct astigmatism, curvature of field, and distortion.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.7 straw at12/(AT 34+ AT 45) <0.9, for example, AT 12/(AT 34+ AT 45) =0.717, 0.734, 0.756, 0.764, 0.789, 0.806, 0.825, 0.841, 0.867, 0.869, 0.872, or 0.887, etc.; here, AT12 is an air gap on the optical axis between the first lens L1 and the second lens L2, AT34 is an air gap on the optical axis between the third lens L3 and the fourth lens L4, and AT45 is an air gap on the optical axis between the fourth lens L4 and the fifth lens L5. By reasonably setting the mutual relationship between the air interval of the first lens L1 and the second lens L2 on the optical axis, the air interval of the third lens L3 and the fourth lens L4 on the optical axis and the air interval of the fourth lens L4 and the fifth lens L5 on the optical axis, the air interval of the first lens L1 and the second lens L2, the air interval of the third lens L3 and the fourth lens L4 and the air interval of the fourth lens L4 and the fifth lens L5 are favorably controlled within a reasonable range, the optical lens 100 is favorably provided with enough air gap ratio, and the stability and the imaging quality of the optical lens 100 are ensured; meanwhile, the optical total length of the optical lens 100 can be further regulated, so that the tolerance sensitivity among the lenses can be reduced under the condition that the optical total length of the optical lens 100 is shortened to realize miniaturization design, the assembly difficulty of each lens can be reduced, and the assembly stability of each lens can be improved; moreover, the overall structure compactness of the optical lens 100 is improved, so that the optical lens 100 can fully utilize the internal space thereof, and the incident angle of the light beam incident on each surface is reduced, thereby reducing the risks of stray light and ghost image between adjacent lenses, helping the imaging light to gather, improving aberration and reducing distortion, and effectively expanding the field angle of the whole optical lens 100 and maintaining good imaging quality.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.8 straw sd11/SD51<0.9, for example SD11/SD51=0.829, 0.832, 0.835, 0.842, 0.843, 0.845, 0.856, 0.877, 0.883, or 0.887, etc.; where SD11 is the maximum effective half aperture of the object-side surface S1 of the first lens L1, and SD51 is the maximum effective half aperture of the object-side surface S9 of the fifth lens L5. The ratio of the maximum effective half aperture of the object side surface S1 of the first lens L1 to the maximum effective half aperture of the object side surface S9 of the fifth lens L5 is controlled within a reasonable range, so that light between the first lens L1 and the fifth lens L5 can be smoothly transmitted, the influence of vignetting on the relative illumination of the marginal field of view is reduced, the imaging quality of the optical lens 100 is ensured, meanwhile, the radial size of the first lens L1 can be reduced, the small head design of the optical lens 100 with the eight-piece type lens is realized, the opening size on the screen of equipment can be reduced, and the screen occupation ratio of the equipment is improved. In addition, satisfying the above limitation of the relational expression is also advantageous for the processing and molding of the first lens L1 and the fifth lens L5, and improves the yield of the lenses.
In some embodiments, the optical lens 100 satisfies the following relationship: 1.6< (SD 62-SD 71)/(SD 72-SD 81) <2.1, for example (SD 62-SD 71)/(SD 72-SD 81) =1.647, 1.662, 1.685, 1.711, 1.756, 1.779, 1.848, 1.861, 1.889, 1.943, 2.034; or 2.086, etc.; here, SD62 is the maximum effective half-aperture of the image-side surface S12 of the sixth lens L6, SD71 is the maximum effective half-aperture of the object-side surface S13 of the seventh lens L7, SD72 is the maximum effective half-aperture of the image-side surface S14 of the seventh lens L7, and SD81 is the maximum effective half-aperture of the object-side surface S15 of the eighth lens L8. By controlling the difference between the maximum effective half aperture of the image-side surface S12 of the sixth lens L6 and the maximum effective half aperture of the object-side surface S13 of the seventh lens L7 and the difference between the maximum effective half aperture of the image-side surface S14 of the seventh lens L7 and the maximum effective half aperture of the object-side surface S15 of the eighth lens L8 to be within a certain range, the light can smoothly and smoothly pass through the rear group of lenses (i.e., the lens group consisting of the sixth lens L6, the seventh lens L7 and the eighth lens L8), the deflection angle of the light between the lenses is reduced, so that the light in the peripheral field can enter the object-side surface S15 of the eighth lens L8 from the image-side surface S12 of the sixth lens L6 with a slow variation tendency, peripheral aberration is reduced, thereby facilitating reduction of the risk of distortion of the optical lens 100 and reducing the sensitivity of the peripheral field.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.9 n tau/CT 5<1.0, e.g., CT4/CT5=0.918, 0.923, 0.936, 0.941, 0.943, 0.944, 0.947, 0.949, 0.954, 0.961, 0.975, 0.981, or 0.997, etc.; wherein CT4 is the thickness of the fourth lens element L4 on the optical axis, and CT5 is the thickness of the fifth lens element L5 on the optical axis. Through reasonable configuration of the central thicknesses of the fourth lens L4 and the fifth lens L5, on one hand, under the condition that the optical lens 100 is ensured to have a proper optical total length, the fourth lens L4 and the fifth lens L5 are prevented from being too curved or smooth, so that the processing and forming difficulty of the fourth lens L4 and the fifth lens L5 is reduced, further engineering manufacturing can be better realized, and the processing and manufacturing of the fourth lens L4 and the fifth lens L5 are facilitated; on the other hand, the refractive power relationship between the fourth lens element L4 and the fifth lens element L5 can be effectively adjusted, so that the optical performance of the optical lens 100 can be improved while the wide-angle and small-sized design of the optical lens 100 is facilitated; and the exit angle of the light rays exiting the optical lens 100 can be reduced, the phenomenon that the light rays with large angles can not be effectively converged to the imaging surface 101 can be avoided, the sensitivity of the photosensitive chip is improved, the characteristic of the large image surface of the optical lens 100 can be realized, the photosensitive chip with higher pixels can be matched, the imaging quality is improved, meanwhile, the edge of the imaging surface 101 of the optical lens 100 can obtain higher relative brightness, and the possibility of generating a dark angle by the optical lens 100 is reduced.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.85<R9/R10<1.85, for example R9/R10=0.863, 0.913, 0.935, 0.947, 0.951, 0.962, 0.977, 0.988, 1.039, 1.119, 1.293, 1.447, 1.593, 1.776 or 1.840 and the like; wherein R9 is a curvature radius of the object-side surface S9 of the fifth lens element L5 on the optical axis, and R10 is a curvature radius of the image-side surface S10 of the fifth lens element L5 on the optical axis. When the above relational expression is satisfied, the aspect ratio of the object-side surface S9 and the image-side surface of the fifth lens element L5 can be well controlled, so as to limit the shape of the fifth lens element L5, and thus, not only can the refractive power of the fifth lens element L5 borne by the entire optical lens system 100 be effectively controlled, but also the amount of spherical aberration contribution of the fifth lens element L5 can be controlled within a reasonable range, so that the image quality of the on-axis field of view and the off-axis field of view is not significantly degraded due to the contribution of spherical aberration, and thus, the spherical aberration and the high-order coma aberration of the optical lens system 100 can be effectively improved, and the optical performance and the imaging quality of the optical lens system 100 can be improved; meanwhile, the shape processability of the fifth lens L5 is ensured, so that the processing production of the fifth lens L5 is ensured, and the manufacturing yield of the fifth lens L5 is improved. When the range of the relational expression is exceeded, the surface of the fifth lens L5 is excessively curved or flat, which is not favorable for the processing and molding of the fifth lens L5, and thus the manufacturing yield of the fifth lens L5 cannot be ensured; meanwhile, it is not beneficial to correct the edge aberration of the optical lens 100, and it may increase the probability of generating the ghost or increase the intensity of the ghost, which affects the imaging quality.
The optical lens 100 of the present embodiment will be described in detail with reference to specific parameters.
First embodiment
As shown in fig. 1, the optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and an optical filter L9, which are sequentially disposed along an optical axis O from an object side to an image side. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.
Further, the object-side surface S1 of the first lens element L1 is convex at a paraxial region thereof, and the image-side surface S2 of the first lens element L1 is concave at a paraxial region thereof; the object-side surface S3 of the second lens element L2 is convex at a paraxial region, and the image-side surface S4 of the second lens element L2 is concave at a paraxial region; the object-side surface S5 of the third lens element L3 is convex at a paraxial region, and the image-side surface S6 of the third lens element L3 is convex at a paraxial region; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial region, and the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region; the object-side surface S9 of the fifth lens element L5 is concave at the paraxial region, and the image-side surface S10 of the fifth lens element L5 is convex at the paraxial region; the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region, and the image-side surface S12 of the sixth lens element L6 is concave at the paraxial region; the object-side surface S13 of the seventh lens element L7 is convex at the paraxial region, and the image-side surface S14 of the seventh lens element L7 is concave at the paraxial region; the object-side surface S15 of the eighth lens element L8 is convex at a paraxial region, and the image-side surface S16 of the eighth lens element L8 is concave at a paraxial region.
Specifically, taking the focal length f =6.45mm of the optical lens 100, the maximum field angle FOV =92.3deg of the optical lens 100, the f-number FNO =1.68 of the optical lens 100, and the total optical length TTL =8.15mm of the optical lens 100 as an example, other parameters of the optical lens 100 are given in table 1 below. In table 1, elements from the object side to the image side along the optical axis O of the optical lens 100 are arranged in order from top to bottom. In the same lens, the surface with the smaller surface number is the object side surface of the lens, and the surface with the larger surface number is the image side surface of the lens, and for example, the surface numbers 1 and 2 correspond to the object side surface S1 and the image side surface S2 of the first lens L1, respectively. The Y radius in table 1 is the radius of curvature of the object or image side of the corresponding face number at the paraxial region O. The first value in the "thickness" parameter list of a lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image-side surface to the back surface of the lens on the optical axis O. The numerical value of the stop 102 in the "thickness" parameter column is the distance on the optical axis O from the stop 102 to the vertex of the next surface (the vertex refers to the intersection point of the surface and the optical axis O), the direction from the object side surface of the first lens L1 to the image side surface of the last lens is the positive direction of the optical axis O, when the value is negative, it indicates that the stop 102 is disposed on the right side of the vertex of the next surface, and if the thickness of the stop 102 is a positive value, the stop 102 is disposed on the left side of the vertex of the next surface. It is understood that the units of the radius Y, thickness, and focal length in table 1 are mm. In table 1, the reference wavelength of the focal length of each lens is 555.00nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.60nm.
TABLE 1
In the first embodiment, the object-side surface and the image-side surface of any one of the first lens L1 to the eighth lens L8 are aspheric surfaces, and the surface shape x of each aspheric lens can be defined by, but is not limited to, the following aspheric surface formula:
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c =1/R (i.e., paraxial curvature c is the inverse of radius R of Y in table 1 above); k is the cone coefficient; ai is a correction coefficient corresponding to the i-th high-order term of the aspheric surface. Table 2 shows the high-order term coefficients A4, A6, A8, a10, a12, a14, a16, a18, and a20 of the respective aspherical mirror surfaces usable in the third lens L3, the fifth lens L5, and the eighth lens L8 in the first embodiment.
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows a longitudinal spherical aberration curve of the optical lens 100 in the first embodiment at wavelengths of 435.00nm, 470.00mm, 510.00nm, 555.00mm, 610.00mm, and 650.00 nm. In fig. 2 (a), the abscissa in the X-axis direction represents the focus shift in mm, and the ordinate in the Y-axis direction represents the normalized field of view. As can be seen from fig. 2 (a), the spherical aberration value of the optical lens 100 in the first embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better.
Referring to fig. 2 (B), fig. 2 (B) is a graph of astigmatism of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm. In fig. 2 (B), the abscissa in the X-axis direction represents the focus shift in mm, and the ordinate in the Y-axis direction represents the angle of view in deg. T in the astigmatism graph indicates the curvature of the imaging plane 101 in the meridional direction, and S indicates the curvature of the imaging plane 101 in the sagittal direction, and it can be seen from (B) in fig. 2 that the astigmatism of the optical lens 100 is well compensated at the wavelength of 555.00 nm.
Referring to fig. 2 (C), fig. 2 (C) is a distortion curve diagram of the optical lens 100 in the first embodiment at a wavelength of 555.00 nm. Where the abscissa along the X-axis direction represents distortion and the ordinate along the Y-axis direction represents field angle in deg. As can be seen from (C) in fig. 2, the distortion of the optical lens 100 is well corrected at the wavelength of 555.00 nm.
Second embodiment
Referring to fig. 3, fig. 3 is a schematic structural diagram of an optical lens 100 according to a second embodiment of the present application. The optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along an optical axis O. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power and the eighth lens element L8 with negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.
Further, in the second embodiment, regarding the surface shapes of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the description of the surface shapes of the respective lenses in the first embodiment, and details are not repeated here.
In the second embodiment, the focal length f =6.38mm of the optical lens 100, the maximum field angle FOV =92.4deg of the optical lens 100, the f-number FNO =1.66 of the optical lens 100, and the total optical length TTL =8.13mm of the optical lens 100 are taken as examples. Other parameters in the second embodiment are given in the following table 3, and the definitions of the parameters can be obtained from the description of the foregoing embodiments, which are not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 3 are mm. In table 3, the reference wavelength of the focal length of each lens is 555.00nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.60nm.
TABLE 3
In the second embodiment, table 4 gives the high-order term coefficients of each aspherical mirror surface usable in the first lens L1 to the eighth lens L8 in the second embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 4
Referring to fig. 4, fig. 4 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the second embodiment, and specific definitions are described with reference to the first embodiment and will not be described herein again. As can be seen from fig. 4 (a), the spherical aberration value of the optical lens 100 in the second embodiment is better, which indicates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 4, astigmatism of the optical lens 100 is well compensated at a wavelength of 555.00 nm. As can be seen from (C) in fig. 4, the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.
Third embodiment
Referring to fig. 5, fig. 5 shows a schematic structural diagram of an optical lens 100 according to a third embodiment of the present application. The optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are disposed in this order from the object side to the image side along an optical axis O. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with positive refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.
Further, in the third embodiment, the profile of each lens is different from that in the first embodiment in that: the image-side surface S8 of the fourth lens element L4 is convex at a paraxial region, and the object-side surface S11 of the sixth lens element L6 is concave at a paraxial region.
In the third embodiment, the focal length f =6.32mm of the optical lens 100, the maximum field angle FOV =92.2deg of the optical lens 100, the f-number FNO =1.67 of the optical lens 100, and the total optical length TTL =8.07mm of the optical lens 100 are taken as examples. Other parameters in the third embodiment are shown in the following table 5, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of Y radius, thickness, and focal length in table 5 are mm. In table 5, the reference wavelength of the focal length of each lens is 555.00nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.60nm.
TABLE 5
In the third embodiment, table 6 gives high-order term coefficients of respective aspherical mirror surfaces usable in the first lens L1 to the eighth lens L8 in the third embodiment, wherein the respective aspherical mirror surfaces can be defined by the formulas given in the first embodiment.
TABLE 6
Referring to fig. 6, fig. 6 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the third embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from fig. 6 (a), the spherical aberration value of the optical lens 100 in the third embodiment is better, which indicates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 6, astigmatism of the optical lens 100 is well compensated at a wavelength of 555.00 nm. As can be seen from (C) in fig. 6, the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.
Fourth embodiment
Fig. 7 is a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present disclosure. The optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are arranged in order from an object side to an image side along an optical axis O. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with negative refractive power, the sixth lens element L6 with positive refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.
Further, in the fourth embodiment, regarding the surface shapes of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8, reference may be made to the description of the surface shapes of the respective lenses in the first embodiment, and details are not repeated here.
In the fourth embodiment, the focal length f =6.37mm of the optical lens 100, the maximum field angle FOV =92deg of the optical lens 100, the f-number FNO =1.66 of the optical lens 100, and the total optical length TTL =8.1mm of the optical lens 100 are taken as examples. Other parameters in the fourth embodiment are given in the following table 7, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 7 are mm. In table 7, the reference wavelength of the focal length of each lens is 555.00nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.60nm.
TABLE 7
In the fourth embodiment, table 8 gives the high-order term coefficients of each aspherical mirror surface usable in the first lens L1 to the eighth lens L8 in the fourth embodiment, wherein each aspherical mirror surface type can be defined by the formula given in the first embodiment.
TABLE 8
Referring to fig. 8, fig. 8 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the fourth embodiment, and specific definitions are described with reference to the first embodiment and will not be repeated herein. As can be seen from fig. 8 (a), the spherical aberration value of the optical lens 100 in the fourth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in the present embodiment is better. As can be seen from (B) in fig. 8, astigmatism of the optical lens 100 is well compensated at a wavelength of 555.00 nm. As can be seen from (C) in fig. 8, the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.
Fifth embodiment
Fig. 9 is a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present application. The optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are arranged in order from an object side to an image side along an optical axis O. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.
Further, in the fifth embodiment, the surface shape of each lens is different from that of each lens in the first embodiment in that: the image-side surface S8 of the fourth lens element L4 is convex at a paraxial region, and the object-side surface S11 of the sixth lens element L6 is concave at a paraxial region.
In the fifth embodiment, the focal length f =6.39mm of the optical lens 100, the maximum field angle FOV =92.2deg of the optical lens 100, the f-number FNO =1.69 of the optical lens 100, and the total optical length TTL =8.11mm of the optical lens 100 are taken as examples. Other parameters in the fifth embodiment are given in the following table 9, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 9 are mm. In table 9, the reference wavelength of the focal length of each lens is 555.00nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.60nm.
TABLE 9
In the fifth embodiment, table 10 gives high-order term coefficients of respective aspherical mirror surfaces usable in the first lens L1 to the eighth lens L8 in the fifth embodiment, wherein the respective aspherical mirror surfaces can be defined by the formulas given in the first embodiment.
Watch 10
Referring to fig. 10, fig. 10 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the fifth embodiment, and specific definitions are described in the first embodiment and will not be repeated herein. As can be seen from fig. 10 (a), the spherical aberration value of the optical lens 100 in the fifth embodiment is better, which indicates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 10, astigmatism of the optical lens 100 is well compensated at a wavelength of 555.00 nm. As can be seen from (C) in fig. 10, the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.
Sixth embodiment
Fig. 11 is a schematic structural diagram of an optical lens 100 according to a sixth embodiment of the present disclosure. The optical lens 100 includes a stop 102, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, and a filter L9, which are arranged in order from an object side to an image side along an optical axis O. The first lens element L1 with positive refractive power, the second lens element L2 with negative refractive power, the third lens element L3 with positive refractive power, the fourth lens element L4 with negative refractive power, the fifth lens element L5 with positive refractive power, the sixth lens element L6 with negative refractive power, the seventh lens element L7 with positive refractive power, and the eighth lens element L8 with negative refractive power. For the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the eighth lens L8, reference may be made to the above-mentioned specific embodiments, and details thereof are not repeated herein.
Further, in the sixth embodiment, the surface shape of each lens is different from that in the first embodiment in that: the image-side surface S8 of the fourth lens element L4 is convex at a paraxial region, and the object-side surface S11 of the sixth lens element L6 is concave at a paraxial region.
In the sixth embodiment, the focal length f =6.3mm of the optical lens 100, the maximum field angle FOV =92.3deg of the optical lens 100, the f-number FNO =1.69 of the optical lens 100, and the total optical length TTL =8.05mm of the optical lens 100 are taken as examples. Other parameters in the sixth embodiment are given in the following table 11, and the definitions of the parameters can be obtained from the foregoing description, which is not repeated herein. It is understood that the units of the radius Y, thickness, and focal length in table 11 are mm. In table 11, the reference wavelength of the focal length of each lens is 555.00nm, and the reference wavelengths of the refractive index and the abbe number of each lens are 587.60nm.
TABLE 11
In the sixth embodiment, table 12 gives high-order term coefficients of respective aspherical mirror surfaces usable in the first lens L1 to the eighth lens L8 in the sixth embodiment, wherein the respective aspherical mirror surfaces can be defined by the formulas given in the first embodiment.
TABLE 12
Referring to fig. 12, fig. 12 shows a longitudinal spherical aberration curve, an astigmatism curve and a distortion curve of the optical lens 100 according to the sixth embodiment, and specific definitions are described with reference to the first embodiment and are not repeated herein. As can be seen from fig. 12 (a), the spherical aberration value of the optical lens 100 in the sixth embodiment is better, which illustrates that the imaging quality of the optical lens 100 in this embodiment is better. As can be seen from (B) in fig. 12, astigmatism of the optical lens 100 is well compensated at a wavelength of 555.00 nm. As can be seen from (C) in fig. 12, the distortion of the optical lens 100 is well corrected at a wavelength of 555.00 nm.
Referring to table 13, table 13 summarizes ratios of the relations in the first embodiment to the sixth embodiment of the present application.
Watch 13
Referring to fig. 13, the present application further discloses a camera module 200, which includes a photo sensor 201 and the optical lens 100 according to any of the first to sixth embodiments, wherein the photo sensor 201 is disposed at an image side of the optical lens 100. The optical lens 100 may be configured to receive a light signal of a subject and project the light signal to the light sensing chip 201, and the light sensing chip 201 may be configured to convert the light signal corresponding to the subject into an image signal. And will not be described in detail herein. It can be understood, have the module of making a video recording 200 of optical lens 100 has the characteristics of large aperture, compare in five formula optical lens and have bigger light inlet amount, can improve the dim light and shoot the condition, be applicable to the dim light environment such as night scene, rainy day, starry sky and shoot, and have better blurring effect, this module of making a video recording 200 still has the characteristics on big image plane simultaneously, can improve the resolution ratio of the module of making a video recording 200 under the condition that realizes miniaturized design, improve the imaging quality of the module of making a video recording 200, reach the shooting effect of high pixel, so that the module of making a video recording 200 has better imaging effect. Since the above technical effects have been described in detail in the embodiments of the optical lens 100, they are not described herein again.
Referring to fig. 14, the present application further discloses an electronic device, in which the electronic device 300 includes a housing 301 and the camera module 200 as described above, and the camera module 200 is disposed on the housing 301 to obtain image information. The electronic device 300 may be, but is not limited to, a mobile phone, a tablet computer, a notebook computer, a smart watch, a monitor, an automobile, or the like. It can be understood that the electronic device 300 having the camera module 200 also has all the technical effects of the optical lens 100. That is, the electronic device 300 has a large aperture, has a larger light-entering amount compared to a five-piece optical lens, can improve a dim light shooting condition, is suitable for shooting in dim light environments such as night scenes, rainy days, starry sky and the like, and has a better blurring effect, and meanwhile, the electronic device 300 also has a large image plane, so that the resolution of the electronic device 300 can be improved under the condition of realizing a miniaturized design, the imaging quality of the electronic device 300 is improved, and a high-pixel shooting effect is achieved, so that the electronic device 300 has a better imaging effect. Since the above technical effects have been described in detail in the embodiments of the optical lens assembly 100, the detailed description thereof is omitted here.
The optical lens, the camera module and the electronic device disclosed by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the optical lens, the camera module and the electronic device and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. An optical lens system includes eight lens elements with refractive power, wherein the eight lens elements include, 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, a sixth lens element, a seventh lens element and an eighth lens element;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the second lens element with negative refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region;
the third lens element with refractive power has a convex image-side surface at paraxial region;
the fourth lens element with refractive power has a concave object-side surface at paraxial region;
the fifth lens element with refractive power has a concave object-side surface at a paraxial region thereof, and has a convex image-side surface at a paraxial region thereof;
the sixth lens element with refractive power has a concave image-side surface at a paraxial region;
the seventh lens element with positive refractive power has a convex object-side surface at paraxial region;
the eighth lens element with negative refractive power has a convex object-side surface at a paraxial region thereof and a concave image-side surface at a paraxial region thereof;
the optical lens satisfies the following relational expression:
1.63<f/D<1.7；
1.0<Imgh/f<1.1；
wherein f is the focal length of the optical lens, D is the entrance pupil diameter of the optical lens, and Imgh is the radius of the maximum effective imaging circle on the imaging surface of the optical lens.
2. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1.1<TTL/Imgh<1.21；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following relation:
2.7<|R7/f|<2.8；
wherein R7 is a curvature radius of an object-side surface of the fourth lens element on an optical axis.
4. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
5.8<|R6/f|<6.2；
wherein R6 is a curvature radius of an image-side surface of the third lens element on an optical axis.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following relation:
0.7<AT12/(AT34+AT45)<0.9；
AT12 is an air gap between the first lens and the second lens on the optical axis, AT34 is an air gap between the third lens and the fourth lens on the optical axis, and AT45 is an air gap between the fourth lens and the fifth lens on the optical axis.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.8<SD11/SD51<0.9；
wherein SD11 is the maximum effective half aperture of the object-side surface of the first lens element, and SD51 is the maximum effective half aperture of the object-side surface of the fifth lens element.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
1.6<(SD62-SD71)/(SD72-SD81)<2.1；
wherein SD62 is a maximum effective half aperture of an image-side surface of the sixth lens element, SD71 is a maximum effective half aperture of an object-side surface of the seventh lens element, SD72 is a maximum effective half aperture of an image-side surface of the seventh lens element, and SD81 is a maximum effective half aperture of an object-side surface of the eighth lens element.
8. An optical lens according to claim 1, wherein the optical lens satisfies the following relation:
0.9-woven fabric CT4/CT5<1.0; and/or
0.85<R9/R10<1.85；
Wherein CT4 is a thickness of the fourth lens element on the optical axis, CT5 is a thickness of the fifth lens element on the optical axis, R9 is a curvature radius of an object-side surface of the fifth lens element on the optical axis, and R10 is a curvature radius of an image-side surface of the fifth lens element on the optical axis.
9. A camera module, comprising the optical lens of any one of claims 1 to 8 and a photosensitive chip, wherein the photosensitive chip is disposed on an image side of the optical lens.
10. An electronic device, comprising a housing and the camera module of claim 9, wherein the camera module is disposed in the housing.
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