CN114740597B - Optical lens, camera module and electronic equipment - Google Patents

Optical lens, camera module and electronic equipment Download PDF

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Publication number
CN114740597B
CN114740597B CN202210291716.6A CN202210291716A CN114740597B CN 114740597 B CN114740597 B CN 114740597B CN 202210291716 A CN202210291716 A CN 202210291716A CN 114740597 B CN114740597 B CN 114740597B
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China
Prior art keywords
lens
optical
optical lens
image
paraxial region
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CN202210291716.6A
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Chinese (zh)
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CN114740597A (en
Inventor
朱童林
龙鑫灿
曾晗
李明
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Jiangxi Jingchao Optical Co Ltd
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Jiangxi Jingchao Optical Co Ltd
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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
    • 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
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/50—Constructional details
    • H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/57—Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses an optical lens, an image pickup module and electronic equipment, wherein the optical lens comprises a first lens with positive focal power, wherein the first lens is sequentially arranged from an object side to an image side along an optical axis, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens having negative optical power, the image-side surface of which is concave; a third lens with optical power, the object side surface of which is a convex surface; a fourth lens element with optical power having a convex object-side surface and a concave image-side surface; a fifth lens element with positive refractive power having a convex image-side surface; the object side surface and the image side surface of the sixth lens with negative focal power are concave. The optical lens also satisfies the relation: 0.6< SD42/SD51<0.9. The optical lens, the camera module and the electronic equipment provided by the embodiment of the invention can meet the design requirements of the small head and the large aperture of the optical lens.

Description

Optical lens, camera module and electronic equipment
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to an optical lens, a camera module, and an electronic device.
Background
Often, a front camera is arranged on a screen of the electronic device so as to meet the requirement that a user adopts the front camera for self-shooting. However, in order to realize the pursuit of the high screen ratio of the electronic device by the user, the head size of the optical lens needs to be reduced, so that the requirement of the high screen ratio of the electronic device is realized. In addition, while reducing the head size of the optical lens, it is also necessary to ensure that the optical lens has a sufficiently large aperture to ensure that the optical lens has a sufficient amount of incident light. In the related art, how to realize the design requirements of the small head and the large aperture of the optical lens is still a technical problem to be solved in the technical field of optical imaging.
Disclosure of Invention
The embodiment of the invention discloses an optical lens, an imaging module and electronic equipment, which can meet the design requirements of a small head and a large aperture of the optical lens.
In order to achieve the above object, the present invention discloses, in a first aspect, an optical lens including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens disposed in order from an object side to an image side along an optical axis;
the first lens element has positive refractive power, wherein an object-side surface of the first lens element is convex at a paraxial region thereof, and an image-side surface of the first lens element is concave at a paraxial region thereof;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface at a paraxial region;
the third lens has optical power, and the object side surface of the third lens is a convex surface at a paraxial region;
the fourth lens element has optical power, wherein an object-side surface of the fourth lens element is convex at a paraxial region thereof, and an image-side surface of the fourth lens element is concave at a paraxial region thereof;
the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface at a paraxial region;
the sixth lens is provided with negative focal power, and the object side surface and the image side surface of the sixth lens are concave surfaces at a paraxial region;
The optical lens satisfies the following relation: 0.6< SD42/SD51<0.9;
the SD42 is half of the maximum effective aperture of the image side surface of the fourth lens element, and the SD51 is half of the maximum effective aperture of the object side surface of the fifth lens element.
In the optical lens provided by the application, the first lens with positive focal power is adopted, the object side surface of the first lens is convex at the paraxial region, and the image side surface of the first lens is concave at the paraxial region, so that the size of the first lens in the direction perpendicular to the optical axis can be effectively controlled, and the design requirements of the small head and miniaturization of the optical lens can be favorably realized. The second lens with negative focal power is adopted, and the image side surface of the second lens is concave at the paraxial region, so that the spherical aberration of the optical lens on the optical axis can be corrected, and the imaging quality of the optical lens can be improved. The object side surface of the third lens element is convex at a paraxial region, so that the total optical length of the optical lens assembly (i.e., the distance from the object side surface of the first lens element to the imaging surface of the optical lens assembly on the optical axis) and the aberration of the optical lens assembly can be reduced, thereby facilitating the miniaturization design of the optical lens assembly and improving the imaging quality of the optical lens assembly. The object side surface of the fourth lens element is convex at a paraxial region, and the image side surface of the fourth lens element is concave at a paraxial region, which is advantageous for miniaturization design of the optical lens. The fifth lens with positive focal power is adopted, and the image side surface of the fifth lens is convex at the paraxial region, so that the aberration of the optical lens can be effectively corrected, and the imaging quality of the optical lens is further improved. The sixth lens with negative focal power is adopted, and the object side surface and the image side surface of the sixth lens are concave surfaces at the paraxial region, so that the deflection angle of light rays and the field angle of the optical lens can be increased, and the design requirement of miniaturization of the optical lens can be met. Therefore, the optical lens can realize the design requirements of small head and miniaturization by reasonably configuring the focal power and the surface shape of each lens. In addition, by controlling the half of the maximum effective aperture of the image side surface of the fourth lens element and the half of the maximum effective aperture of the object side surface of the fifth lens element within the above-mentioned ranges, the aperture of the image side surface of the fourth lens element and the aperture of the object side surface of the fifth lens element can be reasonably configured, which is beneficial to not only the characteristics of the large image surface of the optical lens element, but also the design requirements of the small head of the optical lens element. Thus, when the optical lens is applied to the electronic equipment, the screen duty ratio of the electronic equipment can be improved. In addition, when the relation is satisfied, the processing and forming of the first lens and the expansion of the aperture of the optical lens are facilitated, so that the design requirement of the large aperture of the optical lens is met, the optical lens can have good light entering quantity, and the imaging quality of the optical lens is improved.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0.5mm -1 <FNO/(SD42+SD51)<0.7mm -1 The method comprises the steps of carrying out a first treatment on the surface of the Wherein FNO is the f-number of the optical lens.
By combiningThe relationship between the f-number of the optical lens and the sum of half of the maximum effective aperture of the image side surface of the fourth lens and the object side surface of the fifth lens is limited, so that not only can the design requirement of the large aperture of the optical lens be met, but also enough light flux can be provided for the optical lens to meet the shooting requirement of the optical lens for high image quality and high definition. When FNO/(SD 42+SD 51) is more than or equal to 0.7mm -1 When the optical lens is used, enough light flux can be provided for the optical lens, but the area of the optical lens can be increased, so that the miniaturization design requirement of the optical lens is not met; when FNO/(SD 42+SD 51) is less than or equal to 0.5mm -1 When the light quantity of the optical lens is insufficient, the accuracy of capturing images by the optical lens can be affected, and high-resolution imaging of the optical lens is not facilitated.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 2.1mm < TTL/FNO <2.4mm; wherein TTL is the distance from the object side surface of the first lens to the imaging surface of the optical lens on the optical axis, that is, the total optical length of the optical lens, and FNO is the f-number of the optical lens.
The positive and negative distribution of the focal power of each lens of the optical lens and the curvature radius of the lens surface are reasonably controlled, so that the optical lens has the characteristic of a large aperture, and in addition, the relationship between the total optical length of the optical lens and the aperture number of the optical lens is controlled, so that the optical lens has the characteristics of miniaturization and large aperture, and the design requirements of the optical lens on the large aperture and miniaturization are met.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 2.4< | (r6+r8)/r12| <3.5; wherein R6 is a radius of curvature of the object side surface of the third lens element at the optical axis, R8 is a radius of curvature of the object side surface of the fourth lens element at the optical axis, and R12 is a radius of curvature of the object side surface of the sixth lens element at the optical axis.
When the optical lens meets the above relation, the object side surface of the third lens element, the object side surface of the fourth lens element and the object side surface of the sixth lens element are not only beneficial to control, so as to limit the shapes of the third lens element, the fourth lens element and the sixth lens element, and further control the spherical aberration contribution of the third lens element, the fourth lens element and the sixth lens element within a reasonable range, so that the image quality of the field of view of the optical lens element on the optical axis and the field of view of the optical lens element outside the optical axis cannot be obviously degraded due to the change of the spherical aberration contribution, thereby being beneficial to the improvement of the performance of the optical lens element, and being beneficial to the processing and production of each lens element.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0.4< T456max/ALT456<0.5; wherein T456max is the maximum value of the thickness of the fourth lens on the optical axis, the thickness of the fifth lens on the optical axis, and the thickness of the sixth lens on the optical axis, and ALT456 is the sum of the thicknesses of the fourth lens, the fifth lens, and the sixth lens on the optical axis.
By controlling the proportional relationship between the maximum value of the thicknesses of the fourth lens, the fifth lens and the sixth lens on the optical axis and the sum of the thicknesses of the fourth lens, the fifth lens and the sixth lens on the optical axis, the total optical length of the optical lens can be effectively shortened and the imaging quality of the optical lens can be maintained. When the optical lens meets the relation, the thicknesses of the fourth lens, the fifth lens and the sixth lens can be reasonably planned on the premise of meeting the imaging quality of the optical lens, so that the design requirement of miniaturization of the optical lens is further met.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0.35< DTmax/DT345<0.45; wherein DTmax is the maximum air gap on the optical axis between two adjacent lenses in the third lens to the sixth lens, and DT345 is the sum of the air gaps on the optical axis between two adjacent lenses in the third lens to the sixth lens.
When the optical lens satisfies the above relation, the optical lens is favorable for collecting imaging light rays of the optical lens, improves aberration of the optical lens, reduces distortion of the optical lens, and can maintain good imaging quality of the optical lens while enlarging the field angle of the whole optical lens.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0.6< |f5/f| <0.7; wherein f is the focal length of the optical lens, and f5 is the focal length of the fifth lens.
When the optical lens meets the relation, the light trend of the optical lens is gentle, so that the sensitivity of the optical lens is controlled, and the imaging quality of the optical lens is ensured; when f5/f is less than or equal to 0.6, the focal length of the fifth lens is too small, the light converging capability is too strong, so that the aberration correction difficulty generated by the fifth lens is high, the shooting definition of the optical lens is low, the processing sensitivity of the fifth lens is increased, and the processing difficulty of the fifth lens is high. In addition, when f5/f is less than or equal to 0.6, the light is not beneficial to being dispersed in an imaging plane; when f5/f is more than or equal to 0.7, the focal length of the fifth lens is too large, and the light converging capability is insufficient, so that the collection of the light entering the optical lens is not facilitated, the angle of view of the optical lens is smaller, the correction of aberration generated by the first lens to the fourth lens is also not facilitated, and the shooting definition of the optical lens is lower.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 0.2< f12/f56<0.5; wherein f12 is a combined focal length of the first lens and the second lens, and f56 is a combined focal length of the fifth lens and the sixth lens.
When the optical lens meets the above relation, the combined focal length of the first lens group (i.e. the first lens and the second lens) and the second lens group (i.e. the fifth lens and the sixth lens) can be reasonably constrained, on one hand, the plane design of the first lens and the second lens can be matched, and on the other hand, the incident light rays with large angles can be reasonably guided to an imaging plane, so that the imaging distortion and astigmatism of the optical lens caused by the incident light rays with excessive angles can be avoided; on the other hand, the optical power of the optical lens can be reasonably distributed by matching with the surface type designs of the fifth lens and the sixth lens, so that reasonable aberration compensation is provided, and the tolerance sensitivity of the optical lens is reduced and the imaging quality of the optical lens is improved. When f12/f56 is more than or equal to 0.5, the fifth lens and the sixth lens are required to bear excessive focal power, and the manufacturability of the fifth lens and the sixth lens is poor, so that the aberration generated by the optical lens is not easy to correct; when f12/f56 is less than or equal to 0.2, the calibers of the first lens and the second lens are not easy to be large, and the assembly of the optical lens is not facilitated.
As an alternative implementation manner, in an embodiment of the present invention, the optical lens satisfies the following relation: 1< | (sag12+sag13)/sag13| <3; wherein SAG12 is the sagittal height of the object-side surface of the sixth lens element at the maximum effective radius, and SAG13 is the sagittal height of the image-side surface of the sixth lens element at the maximum effective radius.
When the optical lens satisfies the above relation, the object-side surface and the image-side surface of the sixth lens element are similar in shape, so that the peripheral light can be smoothly transitioned, and the sensitivity of the sixth lens element can be reduced.
In a second aspect, the present invention discloses an image capturing module, where the image capturing module includes a photosensitive chip and the optical lens described in the first aspect, and the photosensitive chip is disposed on an image side of the optical lens. The camera module with the optical lens of the first aspect can meet the design requirements of a small head and a large aperture of the camera module.
In a third aspect, the invention discloses an electronic device, which comprises a housing and the camera module set in the second aspect, wherein the camera module set is arranged in the housing. The electronic equipment with the camera module can meet the design requirements of the small head and the large aperture of the electronic equipment.
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 first lens with positive focal power is adopted, the object side surface of the first lens is a convex surface at the paraxial region, and the image side surface of the first lens is a concave surface at the paraxial region, so that the size of the first lens in the direction perpendicular to the optical axis can be effectively controlled, and the design requirements of the small head and miniaturization of the optical lens can be favorably realized. The second lens with negative focal power is adopted, and the image side surface of the second lens is concave at the paraxial region, so that the spherical aberration of the optical lens on the optical axis can be corrected, and the imaging quality of the optical lens can be improved. The object side surface of the third lens is a convex surface at the paraxial region, so that the total optical length of the optical lens can be shortened, the aberration of the optical lens can be corrected, the miniaturization design of the optical lens is facilitated, and the imaging quality of the optical lens is improved. The object side surface of the fourth lens element is convex at a paraxial region, and the image side surface of the fourth lens element is concave at a paraxial region, which is advantageous for the slim and compact design of the optical lens assembly. The fifth lens with positive focal power is adopted, and the image side surface of the fifth lens is convex at the paraxial region, so that the aberration of the optical lens can be effectively corrected, and the imaging quality of the optical lens is further improved. The sixth lens with negative focal power is adopted, and the object side surface and the image side surface of the sixth lens are concave surfaces at the paraxial region, so that the deflection angle of light rays and the field angle of the optical lens can be increased, and the design requirement of miniaturization of the optical lens can be met. In addition, the optical lens satisfies the relation 0.6< SD42/SD51<0.9, and the aperture of the image side surface of the fourth lens and the aperture of the object side surface of the fifth lens can be reasonably configured by controlling half of the maximum effective aperture of the image side surface of the fourth lens and half of the maximum effective aperture of the object side surface of the fifth lens within the above range, so that the characteristics of the large image surface of the optical lens are facilitated, and the design requirement of the small head of the optical lens is facilitated. Thus, when the optical lens is applied to the electronic equipment, the screen duty ratio of the electronic equipment can be improved. In addition, when the relation is satisfied, the processing and forming of the first lens and the expansion of the aperture of the optical lens are facilitated, so that the design requirement of the large aperture of the optical lens is met, the optical lens can have good light entering quantity, and the imaging quality of the optical lens is improved. Therefore, the optical lens provided by the invention can meet the design requirements of small head, miniaturization and large aperture of the optical lens.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed 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 other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of an optical lens according to an embodiment of the present invention;
FIG. 2 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an optical lens disclosed in a second embodiment of the present invention;
FIG. 4 is a graph of light spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a second embodiment of the present invention;
FIG. 5 is a schematic diagram of an optical lens according to a third embodiment of the present invention;
FIG. 6 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a third embodiment of the present invention;
FIG. 7 is a schematic diagram of an optical lens according to a fourth embodiment of the present invention;
FIG. 8 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to a fourth embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical lens disclosed in a fifth embodiment of the present invention;
FIG. 10 is a graph of light ray spherical aberration (mm), astigmatic curve (mm) and distortion (%) of an optical lens according to the fifth embodiment of the present invention;
FIG. 11 is a schematic view of a camera module according to the present disclosure;
fig. 12 is a schematic structural view of an electronic device disclosed in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate an azimuth or a positional relationship based on that shown in the drawings. These terms are only used to better describe the present invention and its embodiments and are not intended to limit the scope of the indicated devices, elements or components to the particular orientations or to configure and operate in the particular orientations.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in the present invention will be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish between different devices, elements, or components (the particular species and configurations may be the same or different), and are not used to indicate or imply the relative importance and number of devices, elements, or components indicated. Unless otherwise indicated, the meaning of "a plurality" is two or more.
The technical scheme of the invention will be further described with reference to the examples and the accompanying drawings.
Referring to fig. 1, according to a first aspect of the present invention, an optical lens 100 is disclosed, the optical lens 100 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a sixth lens L6 sequentially disposed from an object side to an image side along an optical axis O. In imaging, light enters the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 in order from the object side of the first lens L1 and finally forms an image on the imaging surface 101 of the optical lens 100. The first lens L1 has positive power, the second lens L2 has negative power, the third lens L3 has positive or negative power, the fourth lens L4 has positive or negative power, the fifth lens L5 has positive power, and the sixth lens L6 has negative power.
Further, the object-side surface 11 of the first lens element L1 is convex at the paraxial region O, and the image-side surface 12 of the first lens element L1 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex or concave at a paraxial region O, and the image-side surface 22 of the second lens element L2 is concave at the paraxial region O; the object-side surface 31 of the third lens element L3 is convex at a paraxial region O, and the image-side surface 32 of the third lens element L3 is convex or concave at the paraxial region O; the object-side surface 41 of the fourth lens element L4 is convex at a paraxial region O, and the image-side surface 42 of the fourth lens element L4 is concave at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is convex or concave at a paraxial region O, and the image-side surface 52 of the fifth lens element L5 is convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be plastic lenses, so that the optical lens 100 is light and thin and is easy to process the complex surface types of the lenses.
Alternatively, the materials of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6 may be glass, so that the optical lens 100 has a good optical effect and the temperature sensitivity of the optical lens 100 can be reduced.
The first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 may be spherical lenses or aspherical lenses. It is understood that one aspherical lens can achieve the effect of correcting aberrations by a plurality of spherical lenses. That is, the use of an aspherical lens can correct aberrations and reduce the number of lenses used, which is advantageous in meeting the requirements of miniaturization of the optical lens 100 and improving imaging quality. The specific number of the spherical lenses and the aspherical lenses may be set according to practical situations, for example, the above lenses are all aspherical lenses, or the above first lens L1 is a spherical lens, and the rest of the lenses are aspherical lenses, or the first lens L1 and the third lens L3 are spherical lenses, and the rest of the lenses are aspherical lenses, which is not limited specifically in this embodiment.
In some embodiments, the optical lens 100 further includes a diaphragm 102, where the diaphragm 102 may be an aperture diaphragm and/or a field diaphragm, and may be disposed on the object side surface 11 of the first lens L1 of the optical lens 100. It will be appreciated that in other embodiments, the diaphragm 102 may be disposed between other lenses, for example, between the image side 12 of the first lens element L1 and the object side 21 of the second lens element L2, and the arrangement may be specifically adjusted according to practical situations, and the embodiment is not limited thereto.
In some embodiments, the optical lens 100 further includes a filter 103, and the filter 103 is disposed between the sixth lens L6 and the imaging surface 101 of the optical lens 100. Optionally, the optical filter 103 may be an infrared optical filter, so that infrared light can be filtered out, and the imaging quality is improved, so that the imaging better meets the visual experience of human eyes. It is to be understood that the optical filter 103 may be made of an optical glass coating or may be made of a colored glass, and may be specifically selected according to practical needs, which is not particularly limited in this embodiment.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.6< SD42/SD51<0.9; the SD42 is half of the maximum effective aperture of the image-side surface 42 of the fourth lens element L4, and the SD51 is half of the maximum effective aperture of the object-side surface 51 of the fifth lens element L5. By controlling half of the maximum effective aperture of the image-side surface 42 of the fourth lens element L4 and half of the maximum effective aperture of the object-side surface 51 of the fifth lens element L5 within the above-mentioned ranges, the aperture of the image-side surface 42 of the fourth lens element L4 and the aperture of the object-side surface 51 of the fifth lens element L5 can be reasonably arranged, which is beneficial to not only the large image-plane characteristics of the optical lens 100, but also the design requirements of the small head of the optical lens 100. So that the screen ratio of the electronic device can be increased when the optical lens 100 is applied to the electronic device. In addition, when the above relation is satisfied, the processing and forming of the first lens L1 and the expansion of the aperture of the optical lens 100 are facilitated, so that the design requirement of the large aperture of the optical lens 100 is achieved, the optical lens 100 can have a good light entering amount, and the imaging quality of the optical lens 100 is further improved.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.5mm -1 <FNO/(SD42+SD51)<0.7mm -1 The method comprises the steps of carrying out a first treatment on the surface of the Where FNO is the f-number of optical lens 100. By reasonably defining the relationship between the f-number of the optical lens 100 and the sum of half of the maximum effective aperture of the image side surface 42 of the fourth lens element L4 and the object side surface 51 of the fifth lens element L5, not only the design requirement of the large aperture of the optical lens 100 can be satisfied, but also a sufficient amount of light can be provided for the optical lens 100 to satisfy the shooting requirement of the optical lens 100 for high image quality and high definition. When FNO/(SD 42+SD 51) is more than or equal to 0.7mm -1 When the optical lens 100 is in use, enough light can be provided for the optical lens 100, but the area of the optical lens 100 is increased, which is not beneficial to realizing the design requirement of miniaturization of the optical lens 100; when FNO/(SD 42+SD 51) is less than or equal to 0.5mm -1 In this case, insufficient light passing through the optical lens 100 may affect the accuracy of capturing the image by the optical lens 100, which is not beneficial for the optical lens 100 to implement high resolution imaging.
In some embodiments, the optical lens 100 satisfies the following relationship: 2.1mm < TTL/FNO <2.4mm; the TTL is the distance from the object side surface 11 of the first lens element L1 to the imaging surface 101 of the optical lens element 100 on the optical axis O, i.e. the total optical length of the optical lens element, and FNO is the f-number of the optical lens element 100. By reasonably controlling the positive and negative distribution of the focal power and the lens surface curvature radius of each lens of the optical lens 100, the optical lens 100 can have the characteristic of a large aperture, and in addition, by controlling the relation between the total optical length of the optical lens 100 and the aperture number of the optical lens 100, the optical lens 100 is beneficial to having the characteristics of miniaturization and large aperture, so as to realize the design requirements of the optical lens 100 for large aperture and miniaturization.
In some embodiments, the optical lens 100 satisfies the following relationship: 2.4< | (r6+r8)/r12| <3.5; wherein R6 is a radius of curvature of the object-side surface 31 of the third lens element L3 at the optical axis O, R8 is a radius of curvature of the object-side surface 41 of the fourth lens element L4 at the optical axis O, and R12 is a radius of curvature of the object-side surface 61 of the sixth lens element L6 at the optical axis O. When the optical lens 100 satisfies the above relation, it is not only advantageous to control the object-side surface 31 of the third lens L3, the object-side surface 41 of the fourth lens L4, and the object-side surface 61 of the sixth lens L6, thereby restricting the shapes of the third lens L3, the fourth lens L4, and the sixth lens L6, and further controlling the spherical aberration contribution of the third lens L3, the fourth lens L4, and the sixth lens L6 within a reasonable range, so that the image quality of the field of view of the optical lens 100 on the optical axis O and the field of view of the optical lens 100 outside the optical axis O will not be significantly degraded due to the change of the spherical aberration contribution, which is advantageous to the improvement of the performance of the optical lens 100, and also advantageous to the processing and production of each lens.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.4< T456max/ALT456<0.5; wherein T456max is the maximum value of the thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 on the optical axis O, and ALT456 is the sum of the thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 on the optical axis O. By controlling the proportional relationship between the maximum value of the thicknesses of the fourth lens L4, the fifth lens L5, and the sixth lens L6 on the optical axis O and the sum of the thicknesses of the fourth lens L4, the fifth lens L5, and the sixth lens L6 on the optical axis O, the optical total length of the optical lens 100 can be effectively shortened and the imaging quality of the optical lens 100 can be maintained. When the optical lens 100 satisfies the above relation, the lens thicknesses of the fourth lens L4, the fifth lens L5 and the sixth lens L6 can be reasonably planned on the premise of satisfying the imaging quality of the optical lens 100, thereby further satisfying the design requirement of miniaturization of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.35< DTmax/DT345<0.45; wherein DTmax is the maximum air gap on the optical axis O between two adjacent lenses of the third lens L3 to the sixth lens L6, and DT345 is the sum of the air gaps on the optical axis O between two adjacent lenses of the third lens L3 to the sixth lens L6. When the optical lens 100 satisfies the above relation, the convergence of the imaging light of the optical lens 100 is facilitated, the aberration of the optical lens 100 is improved, the distortion of the optical lens 100 is reduced, and the good imaging quality of the optical lens 100 can be maintained while the angle of view of the entire optical lens 100 is enlarged.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.6< |f5/f| <0.7; where f is the focal length of the optical lens 100, and f5 is the focal length of the fifth lens L5. When the optical lens 100 satisfies the above relation, the light of the optical lens 100 is smooth, which is beneficial to controlling the sensitivity of the optical lens 100, so as to ensure the imaging quality of the optical lens 100; when f5/f is less than or equal to 0.6, the focal length of the fifth lens L5 is too small, and the light converging capability is too strong, so that the aberration correction difficulty generated by the fifth lens L5 is relatively high, thereby resulting in relatively low shooting definition of the optical lens 100, and meanwhile, the processing sensitivity of the fifth lens L5 is increased, resulting in relatively high processing difficulty of the fifth lens L5. In addition, when f5/f is less than or equal to 0.6, the light is not favorable to be dispersed in the imaging surface 101; when f5/f is greater than or equal to 0.7, the focal length of the fifth lens L5 is too large, and the focusing capability on light is insufficient, so that not only is the light entering the optical lens 100 unfavorable to be collected, resulting in a smaller field angle of the optical lens 100, but also the aberration generated by the first lens L1 to the fourth lens L4 is unfavorable to be corrected, resulting in lower shooting definition of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 0.2< f12/f56<0.5; wherein f12 is a combined focal length of the first lens L1 and the second lens L2, and f56 is a combined focal length of the fifth lens L5 and the sixth lens L6. When the optical lens 100 satisfies the above relation, the combined focal length of the first lens group (i.e., the first lens L1 and the second lens L2) and the second lens group (i.e., the fifth lens L5 and the sixth lens L6) can be reasonably constrained, so that on one hand, the plane design of the first lens L1 and the second lens L2 can be matched to reasonably guide the incident light rays with a large angle to the imaging plane, and avoid the imaging distortion and astigmatism of the optical lens 100 caused by the incident light rays with an excessive angle; on the other hand, the optical power of the optical lens 100 can be reasonably distributed by matching with the surface designs of the fifth lens L5 and the sixth lens L6, so as to provide reasonable aberration compensation, which is beneficial to reducing the tolerance sensitivity of the optical lens 100 and improving the imaging quality of the optical lens 100. When f12/f56 is greater than or equal to 0.5, excessive focal power is required to be borne by the fifth lens L5 and the sixth lens L6, manufacturability of the fifth lens L5 and the sixth lens L6 is poor, and aberration generated by the optical lens 100 is not easy to correct; when f12/f56 is less than or equal to 0.2, the apertures of the first lens L1 and the second lens L2 are not easy to be large, which is not beneficial to the assembly of the optical lens 100.
In some embodiments, the optical lens 100 satisfies the following relationship: 1< | (sag12+sag13)/sag13| <3; wherein SAG12 is the sagittal height of the object-side surface 61 of the sixth lens L6 at the maximum effective radius, and SAG13 is the sagittal height of the image-side surface 62 of the sixth lens L6 at the maximum effective radius. Specifically, the sagittal height of the object-side surface 61 of the sixth lens L6 is the distance between a point on the object-side surface 61 of the sixth lens L6 and the intersection point of the object-side surface 61 of the sixth lens L6 and the optical axis O in a direction parallel to the optical axis O; when the sagittal value is positive, in a direction parallel to the optical axis O, the point is closer to the image side of the optical lens 100 than at the center of the object side 61 of the sixth lens L6; when the value of the sagittal height is negative, in the direction parallel to the optical axis O, the point is closer to the object side of the optical lens 100 than at the center of the object side 61 of the sixth lens L6. Similarly, the sagittal height of the image-side surface 62 of the sixth lens element L6 is the distance between a point on the image-side surface 62 of the sixth lens element L6 and the intersection point of the image-side surface 62 of the sixth lens element L6 with the optical axis O along a direction parallel to the optical axis O. When the optical lens 100 satisfies the above relation, the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 have similar shapes, which not only can smoothly transition the peripheral light but also can reduce the sensitivity of the sixth lens element L6.
The optical lens 100 of the embodiment will be described in detail with specific parameters.
Example 1
As shown in fig. 1, a schematic structural diagram of an optical lens 100 according to an embodiment of the present invention is shown, where the optical lens 100 includes a diaphragm 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, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens L1 has positive optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the fourth lens L4 has negative optical power, the fifth lens L5 has positive optical power, and the sixth lens L6 has negative optical power.
Further, the object-side surface 11 of the first lens element L1 is convex at a paraxial region O, and the image-side surface 12 is concave at the paraxial region O; the object-side surface 21 of the second lens element L2 is convex at a paraxial region O, and the image-side surface 22 is concave at the paraxial region O; the third lens element L3 has a convex object-side surface 31 at a paraxial region O and a concave image-side surface 32 at the paraxial region O; the fourth lens element L4 has a convex object-side surface 41 at a paraxial region O and a concave image-side surface 42 at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at a paraxial region O, and the image-side surface 52 is convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O.
Specifically, taking the focal length f= 3.488mm of the optical lens 100, the f-number fno=1.950 of the optical lens 100, half hfov= 41.138 of the maximum field angle of the optical lens 100, the optical total length ttl=4.25 mm of the optical lens 100, and the radius imgh=3.33 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in table 1 below. The elements from the object side to the image side are sequentially arranged in the order of the elements from top to bottom in table 1 along the optical axis O of the optical lens 100. In the same lens element, the surface with smaller surface number is the object side surface of the lens element, and the surface with larger surface number is the image side surface of the lens element, and the surface numbers 2 and 3 correspond to the object side surface 11 and the image side surface 12 of the first lens element L1, respectively. The radius Y in table 1 is the radius of curvature of the object side or image side of the corresponding plane number at the optical axis O. The first value in the "thickness" parameter array of the lens is the thickness of the lens on the optical axis O, and the second value is the distance from the image side surface of the lens to the latter surface on the optical axis O. The value of the aperture 102 in the "thickness" parameter row is the distance between the aperture 102 and the object side surface 11 of the first lens L1 on the optical axis O. It is understood that the units of the Y radius, thickness, and focal length in Table 1 are all mm, and the refractive index and Abbe number in Table 1 are obtained at a reference wavelength of 587.6nm, and the focal length in Table 1 is obtained at a reference wavelength of 555 nm.
In the first embodiment, the object side surface and the image side surface of all lenses are aspherical surfaces. The profile x of each aspherical lens can be defined using, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis O direction; c is the curvature of the aspherical surface at the optical axis O, c=1/Y (i.e., paraxial curvature c is the inverse of the radius of curvature Y in table 1 below); k is a conic coefficient; ai is the correction coefficient of the i-th order of the aspherical surface. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example one are given in Table 2 below.
TABLE 1
TABLE 2
Referring to fig. 2 (a), fig. 2 (a) shows a graph of optical spherical aberration of the optical lens 100 at wavelengths of 650nm, 555nm and 470nm in the first embodiment. 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 indicates that the imaging quality of the optical lens 100 in the present embodiment is better.
Referring to fig. 2 (B), fig. 2 (B) is a light astigmatism diagram of the optical lens 100 at a wavelength of 555nm in the first embodiment. The abscissa along the X-axis direction represents the focus shift in mm, the ordinate along the Y-axis direction represents the image height in mm, T represents the curvature of the imaging plane 101 in the meridian direction, and S represents the curvature of the imaging plane 101 in the sagittal direction. As can be seen from fig. 2 (B), at this wavelength of 555mm, the astigmatism of the optical lens 100 is well compensated.
Referring to fig. 2 (C), fig. 2 (C) is a graph showing distortion of the optical lens 100 at a wavelength of 555nm in the first embodiment. Wherein, the abscissa along the X-axis direction represents distortion, and the ordinate along the Y-axis direction represents image height in mm. As can be seen from fig. 2 (C), the distortion of the optical lens 100 is well corrected at a wavelength of 555 nm.
Example two
As shown in fig. 3, the optical lens 100 according to the second embodiment of the present invention includes a diaphragm 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, and an optical filter 103 sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens L1 has positive optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the fourth lens L4 has negative optical power, the fifth lens L5 has positive optical power, and the sixth lens L6 has negative optical power.
Further, the object-side surface 11 of the first lens element L1 is convex at a paraxial region O, and the image-side surface 12 is concave at the paraxial region O; the object side surface 21 and the image side surface 22 of the second lens element L2 are concave at the paraxial region O; the object side surface 31 and the image side surface 32 of the third lens element L3 are convex at the paraxial region O; the fourth lens element L4 has a convex object-side surface 41 at a paraxial region O and a concave image-side surface 42 at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at a paraxial region O, and the image-side surface 52 is convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O.
Specifically, taking the focal length f= 3.506mm of the optical lens 100, the f-number fno= 1.955 of the optical lens 100, the half hfov=40.913 of the maximum field angle of the optical lens 100, the total optical length ttl=4.25 mm of the optical lens 100, and the radius imgh=3.33 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 3, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the Y radius, thickness, and focal length in Table 3 are all mm, and the refractive index and Abbe number in Table 3 are obtained at a reference wavelength of 587.6nm, and the focal length in Table 1 is obtained at a reference wavelength of 555 nm.
In the second embodiment, the object side surface and the image side surface of all the lenses are aspherical surfaces. The surface shape x of each aspherical lens can be defined by the formula given in the first embodiment, and will not be described here. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example two are given in Table 4 below.
TABLE 3 Table 3
TABLE 4 Table 4
Referring to fig. 4, as can be seen from the graph of (a) optical spherical aberration in fig. 4, the graph of (B) optical spherical aberration in fig. 4, and the graph of (C) distortion in fig. 4, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 4 (a), fig. 4 (B), and fig. 4 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), fig. 2 (B), and fig. 2 (C), and the descriptions are omitted here.
Example III
As shown in fig. 5, a schematic structural diagram of an optical lens 100 according to a third embodiment of the present invention, the optical lens 100 includes a diaphragm 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, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens L1 has positive optical power, the second lens L2 has negative optical power, the third lens L3 has negative optical power, the fourth lens L4 has positive optical power, the fifth lens L5 has positive optical power, and the sixth lens L6 has negative optical power.
Further, the object-side surface 11 of the first lens element L1 is convex at a paraxial region O, and the image-side surface 12 is concave at the paraxial region O; the object side surface 21 and the image side surface 22 of the second lens element L2 are concave at the paraxial region O; the third lens element L3 has a convex object-side surface 31 at a paraxial region O and a concave image-side surface 32 at the paraxial region O; the fourth lens element L4 has a convex object-side surface 41 at a paraxial region O and a concave image-side surface 42 at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at a paraxial region O, and the image-side surface 52 is convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O.
Specifically, taking the focal length f= 3.460mm of the optical lens 100, the f-number fno=1.952 of the optical lens 100, half hfov= 41.241 of the maximum field angle of the optical lens 100, the total optical length ttl=5.15 mm of the optical lens 100, and the radius imgh=3.33 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 5, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the Y radius, thickness, and focal length in Table 5 are all mm, and the refractive index and Abbe number in Table 5 are obtained at a reference wavelength of 587.6nm, and the focal length in Table 5 is obtained at a reference wavelength of 555 nm.
In the third embodiment, the object side surface and the image side surface of all lenses are aspherical surfaces. The surface shape x of each aspherical lens can be defined by the formula given in the first embodiment, and will not be described here. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example three are given in Table 6 below.
TABLE 5
TABLE 6
Referring to fig. 6, as can be seen from the graph of (a) optical spherical aberration in fig. 6, the graph of (B) optical spherical aberration in fig. 6, and the graph of (C) distortion in fig. 6, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 6 (a), 6 (B) and 6 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), 2 (B) and 2 (C), and the descriptions are omitted here.
Example IV
As shown in fig. 7, a schematic structural diagram of an optical lens 100 according to a fourth embodiment of the present invention is shown, and the optical lens 100 includes a diaphragm 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, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens L1 has positive optical power, the second lens L2 has negative optical power, the third lens L3 has negative optical power, the fourth lens L4 has negative optical power, the fifth lens L5 has positive optical power, and the sixth lens L6 has negative optical power.
Further, the object-side surface 11 of the first lens element L1 is convex at a paraxial region O, and the image-side surface 12 is concave at the paraxial region O; the object side surface 21 and the image side surface 22 of the second lens element L2 are concave at the paraxial region O; the third lens element L3 has a convex object-side surface 31 at a paraxial region O and a concave image-side surface 32 at the paraxial region O; the fourth lens element L4 has a convex object-side surface 41 at a paraxial region O and a concave image-side surface 42 at the paraxial region O; the object-side surface 51 of the fifth lens element L5 is concave at a paraxial region O, and the image-side surface 52 is convex at the paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O.
Specifically, taking the focal length f= 3.651mm of the optical lens 100, the f-number fno=1.952 of the optical lens 100, half hfov= 43.211 of the maximum field angle of the optical lens 100, the total optical length ttl=4.55 mm of the optical lens 100, and the radius imgh=3.60 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 7, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the Y radius, thickness, and focal length in Table 7 are all mm, and that the refractive index and Abbe number in Table 7 are obtained at a reference wavelength of 587.6nm, and that the focal length in Table 7 is obtained at a reference wavelength of 555 nm.
In the fourth embodiment, the object side surface and the image side surface of all the lenses are aspherical surfaces. The surface shape x of each aspherical lens can be defined by the formula given in the first embodiment, and will not be described here. The higher order coefficients A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the aspherical mirrors in example four are given in Table 8 below.
TABLE 7
TABLE 8
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Referring to fig. 8, as can be seen from the (a) light spherical aberration graph in fig. 8, the (B) light astigmatic graph in fig. 8, and the (C) distortion graph in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 8 (a), 8 (B) and 8 (C), reference may be made to the descriptions in the first embodiment regarding fig. 2 (a), 2 (B) and 2 (C), and the descriptions are omitted here.
Example five
As shown in fig. 9, a schematic structural diagram of an optical lens 100 according to a fifth embodiment of the present invention is shown, where the optical lens 100 includes a diaphragm 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, and an optical filter 103, which are sequentially disposed from an object side to an image side along an optical axis O.
Further, the first lens L1 has positive optical power, the second lens L2 has negative optical power, the third lens L3 has positive optical power, the fourth lens L4 has negative optical power, the fifth lens L5 has positive optical power, and the sixth lens L6 has negative optical power.
Further, the object-side surface 11 of the first lens element L1 is convex at a paraxial region O, and the image-side surface 12 is concave at the paraxial region O; the object side surface 21 and the image side surface 22 of the second lens element L2 are concave at the paraxial region O; the third lens element L3 has a convex object-side surface 31 at a paraxial region O and a concave image-side surface 32 at the paraxial region O; the fourth lens element L4 has a convex object-side surface 41 at a paraxial region O and a concave image-side surface 42 at the paraxial region O; the object-side surface 51 and the image-side surface 52 of the fifth lens element L5 are convex at a paraxial region O; the object-side surface 61 and the image-side surface 62 of the sixth lens element L6 are concave at the paraxial region O.
Specifically, taking the focal length f= 3.595mm of the optical lens 100, the f-number fno= 1.956 of the optical lens 100, half hfov= 42.318 of the maximum field angle of the optical lens 100, the total optical length ttl=4.55 mm of the optical lens 100, and the radius imgh=3.44 mm of the maximum effective imaging circle of the optical lens 100 as examples, other parameters of the optical lens 100 are given in the following table 9, and the definition of each parameter can be obtained from the description of the foregoing embodiments, which is not repeated herein. It is understood that the units of the Y radius, thickness, and focal length in Table 9 are mm, and the refractive index and Abbe number in Table 9 are obtained at a reference wavelength of 587.6nm, and the focal length in Table 9 is obtained at a reference wavelength of 555 nm.
In embodiment five, the object side and image side surfaces of all lenses are aspherical surfaces. The surface shape x of each aspherical lens can be defined by the formula given in the first embodiment, and will not be described here. The following table 10 gives the higher order coefficients A4, A6, A8, a10, a12, a14, a16, a18 and a20 that can be used for each of the aspherical mirrors in embodiment five.
TABLE 9
Table 10
Referring to fig. 10, as can be seen from the graph of (a) optical spherical aberration in fig. 10, the graph of (B) optical spherical aberration in fig. 10, and the graph of (C) distortion in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical lens 100 are well controlled, so that the optical lens 100 of the embodiment has good imaging quality. In addition, regarding the wavelengths corresponding to the curves in fig. 10 (a), 10 (B) and 10 (C), reference may be made to the descriptions in fig. 2 (a), 2 (B) and 2 (C) in the first embodiment, and the descriptions are omitted here.
Referring to table 11, table 11 is a summary of the ratios of the relationships in the first to fifth embodiments of the present invention.
TABLE 11
Relation/embodiment Example 1 Example two Example III Example IV Example five
0.6<SD42/SD51<0.9 0.693 0.772 0.838 0.821 0.895
0.5mm -1 <FNO/(SD42+SD51)<0.7mm -1 0.551 0.553 0.599 0.644 0.642
2.1mm<TTL/FNO<2.4mm 2.179 2.174 2.126 2.331 2.326
2.4<|(R6+R8)/R12|<3.5 3.090 3.422 3.269 3.311 2.481
0.4<T456max/ALT456<0.5 0.423 0.414 0.479 0.439 0.491
0.35<DTmax/DT345<0.45 0.406 0.406 0.406 0.418 0.386
0.6<|f5/f|<0.7 0.673 0.683 0.672 0.662 0.688
0.2<f12/f56<0.5 0.347 0.220 0.271 0.475 0.393
1<|(SAG12+SAG13)/SAG13|<3 2.065 2.265 2.114 1.974 2.739
In a second aspect, referring to fig. 11, the present invention further discloses an image capturing module 200, where the image capturing module 200 includes a photosensitive chip 201 and the optical lens 100 according to any one of the first to fifth embodiments, the photosensitive chip 201 is disposed on an image side of the optical lens 100, and the photosensitive chip 201 is configured to convert an optical signal corresponding to a subject into an image signal, which is not described herein. It can be understood that the image capturing module 200 with the optical lens system 100 can meet the design requirements of the small head and the large aperture of the image capturing module 200.
In a third aspect, referring to fig. 12, the present invention further discloses an electronic device 300, where the electronic device 300 includes a housing and the camera module 200 as described above, and the camera module 200 is disposed in the housing. It can be appreciated that the electronic device 300 with the camera module 200 can meet the design requirements of the small head and large aperture of the electronic device 300. 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, etc.
The optical lens, the camera module and the electronic device disclosed in the embodiments of the present invention are described in detail, and specific examples are applied to the description of the principles and the implementation modes of the present invention, and the description of the above embodiments is only used to help understand the optical lens, the camera module, the electronic device and the core ideas thereof; meanwhile, as those skilled in the art will vary in the specific embodiments and application scope according to the idea of the present invention, the present disclosure should not be construed as limiting the present invention in summary.

Claims (9)

1. An optical lens, characterized in that the optical lens has six lenses with optical power in total, and the six lenses comprise a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are sequentially arranged from an object side to an image side along an optical axis;
the first lens element has positive refractive power, wherein an object-side surface of the first lens element is convex at a paraxial region thereof, and an image-side surface of the first lens element is concave at a paraxial region thereof;
the second lens has negative focal power, and the image side surface of the second lens is a concave surface at a paraxial region;
the third lens has optical power, and the object side surface of the third lens is a convex surface at a paraxial region;
The fourth lens element has optical power, wherein an object-side surface of the fourth lens element is convex at a paraxial region thereof, and an image-side surface of the fourth lens element is concave at a paraxial region thereof;
the fifth lens has positive focal power, and the image side surface of the fifth lens is a convex surface at a paraxial region;
the sixth lens is provided with negative focal power, and the object side surface and the image side surface of the sixth lens are concave surfaces at a paraxial region;
the optical lens satisfies the following relation:
0.6< SD42/SD51<0.9, and 1< | (SAG12+SAG13)/SAG13| <3;
wherein SD42 is half of the maximum effective aperture of the image side surface of the fourth lens element, SD51 is half of the maximum effective aperture of the object side surface of the fifth lens element, SAG12 is the sagittal height of the object side surface of the sixth lens element at the maximum effective radius, and SAG13 is the sagittal height of the image side surface of the sixth lens element at the maximum effective radius.
2. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.5mm -1 <FNO/(SD42+SD51)<0.7mm -1 ；
Wherein FNO is the f-number of the optical lens.
3. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 2.1mm < TTL/FNO <2.4mm;
Wherein TTL is the distance between the object side surface of the first lens and the imaging surface of the optical lens on the optical axis, and FNO is the f-number of the optical lens.
4. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 2.4< | (r6+r8)/r12| <3.5;
wherein R6 is a radius of curvature of the object side surface of the third lens element at the optical axis, R8 is a radius of curvature of the object side surface of the fourth lens element at the optical axis, and R12 is a radius of curvature of the object side surface of the sixth lens element at the optical axis.
5. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.4< T456max/ALT456<0.5;
wherein T456max is the maximum value of the thickness of the fourth lens on the optical axis, the thickness of the fifth lens on the optical axis, and the thickness of the sixth lens on the optical axis, and ALT456 is the sum of the thicknesses of the fourth lens, the fifth lens, and the sixth lens on the optical axis.
6. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.35< DTmax/DT345<0.45;
Wherein DTmax is the maximum air gap on the optical axis between two adjacent lenses in the third lens to the sixth lens, and DT345 is the sum of the air gaps on the optical axis between two adjacent lenses in the third lens to the sixth lens.
7. The optical lens of claim 1, wherein the optical lens satisfies the following relationship: 0.6< |f5/f| <0.7, and/or 0.2< f12/f56<0.5;
wherein f is a focal length of the optical lens, f5 is a focal length of the fifth lens, f12 is a combined focal length of the first lens and the second lens, and f56 is a combined focal length of the fifth lens and the sixth lens.
8. A camera module, wherein the camera module comprises a photosensitive chip and the optical lens according to any one of claims 1 to 7, and the photosensitive chip is disposed on an image side of the optical lens.
9. An electronic device, comprising a housing and the camera module of claim 8, wherein the camera module is disposed in the housing.
CN202210291716.6A 2022-03-23 2022-03-23 Optical lens, camera module and electronic equipment Active CN114740597B (en)

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