CN114740591B - Optical system, image capturing module and electronic equipment - Google Patents

Optical system, image capturing module and electronic equipment Download PDF

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Publication number
CN114740591B
CN114740591B CN202210192779.6A CN202210192779A CN114740591B CN 114740591 B CN114740591 B CN 114740591B CN 202210192779 A CN202210192779 A CN 202210192779A CN 114740591 B CN114740591 B CN 114740591B
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lens
optical system
lens element
image
paraxial region
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CN114740591A (en
Inventor
龙鑫灿
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
    • 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
    • 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)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Lenses (AREA)

Abstract

The invention relates to an optical system, an image capturing module and electronic equipment. The optical system includes: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the fourth lens element with refractive power has a concave image-side surface; the fifth lens element with refractive power has a convex object-side surface; a sixth lens element with refractive power; the seventh lens element with refractive power has a concave object-side surface and a convex image-side surface; an eighth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a ninth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; the optical system satisfies: f/tan (HFOV) is 6.8mm or less and 7.4mm or less. The optical system can realize both wide-angle characteristics and good imaging quality.

Description

Optical system, image capturing module and electronic equipment
Technical Field
The present invention relates to the field of image capturing, and in particular, to an optical system, an image capturing module, and an electronic device.
Background
With the rapid development of the imaging technology, the application of the imaging lens in electronic devices such as smart phones, tablet personal computers, electronic readers and the like is also becoming wider, and in order to improve the market competitiveness of the electronic devices, the performance requirements of the industry on the imaging lens are also becoming higher. The size of the field angle of the imaging lens is one of the important points in the industry, and the large field angle enables the imaging lens to acquire more scene information, so that the user experience of the electronic equipment is improved. However, the current imaging lens easily causes degradation of imaging quality while realizing wide-angle characteristics, affecting the degree of reduction of an image.
Disclosure of Invention
Accordingly, it is necessary to provide an optical system, an image capturing module, and an electronic apparatus for solving the problem that the conventional imaging lens easily causes degradation of imaging quality while realizing wide-angle characteristics.
An optical system comprising, in order from an object side to an image side along an optical axis:
a first lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a second lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
A third lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a fourth lens element with refractive power having a concave image-side surface at a paraxial region;
a fifth lens element with refractive power having a convex object-side surface at a paraxial region;
a sixth lens element with refractive power;
a seventh lens element with refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
an eighth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a ninth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
and the optical system satisfies the following conditional expression:
6.8mm≤f/tan(HFOV)≤7.4mm；
where f is the effective focal length of the optical system and HFOV is half the maximum field angle of the optical system.
In the optical system, the first lens element has positive refractive power, and the object-side surface and the image-side surface of the first lens element are convex and concave at a paraxial region thereof, respectively, so as to be beneficial to converging incident light rays with a large angle, thereby being beneficial to compressing the total length of the optical system. The second lens element with negative refractive power has a convex-concave shape at a paraxial region thereof, which is effective for balancing aberration generated by the first lens element, thereby improving imaging quality of the optical system. The third lens element with positive refractive power has a convex-concave shape at a paraxial region, so that incident light passing through the first lens element and the second lens element can be smoothly transmitted, and the positive and negative refractive power can be matched with each other to cancel aberration generated by each other. The surface-type arrangements of the fourth lens element to the seventh lens element balance the refractive power burden of the front lens element (i.e., the first lens element to the third lens element) and the rear lens element (i.e., the eighth lens element and the ninth lens element) to avoid aberrations that are difficult to correct, and the image-side surface of the fourth lens element is concave at the paraxial region and convex at the paraxial region in combination with the fifth lens element, thereby facilitating smooth transition of light rays. The concave-convex surface shape of the seventh lens at the paraxial region is matched with the convex-concave surface shape of the eighth lens at the paraxial region, so that the deflection angle of light rays can be reduced, and the risk of ghost images is reduced. The eighth lens element with positive refractive power has a negative refractive power and is in balance with the negative refractive power of the ninth lens element, thereby being beneficial to correcting aberration of the optical system. The image side surface of the eighth lens element and the image side surface of the ninth lens element are concave at a paraxial region thereof, which is beneficial to compressing the back focal length of the optical system and thus shortening the total length of the optical system. The biconcave surface of the ninth lens is beneficial to enabling the marginal view field light to effectively enter the imaging surface, so that the relative brightness of the imaging surface is improved, and the imaging quality of the optical system is further improved.
When the above conditional expression is satisfied, the effective focal length and the maximum field angle of the optical system can be reasonably configured, which is favorable for enlarging the field angle of the optical system to realize the wide-angle characteristic, so that the optical system can acquire more scene contents, thereby enriching the imaging information of the optical system, and simultaneously, being favorable for suppressing the distortion of the optical system, thereby improving the imaging quality of the optical system, and in addition, being favorable for shortening the total length of the optical system and realizing the miniaturized design. Thus, the optical system can achieve both wide-angle characteristics and a compact design and good imaging quality. When the angle of view of the optical system is lower than the lower limit of the conditional expression, the distortion of the off-axis field is easily caused to be excessive, so that the distortion phenomenon can occur at the periphery of the image, the reduction degree of the image is reduced, and the improvement of the imaging quality is not facilitated. If the upper limit of the above conditional expression is exceeded, the effective focal length of the optical system is too long, which makes it difficult to effectively compress the total length of the optical system, and thus the volume of the optical system increases, which is disadvantageous for the miniaturization design of the optical system.
In one embodiment, the optical system satisfies the following conditional expression:
6.15mm≤IMGH 2 /TTL≤6.55mm；
The IMGH is the radius of the maximum effective imaging circle of the optical system, and the TTL is the distance between the object side surface of the first lens and the imaging surface of the optical system on the optical axis, that is, the total optical length of the optical system. When the above conditional expression is satisfied, the total length and half image height of the optical system can be reasonably configured, so that the optical system can be realized with both miniaturization design and large image plane characteristics, and the optical system has a compact structure and good imaging quality.
In one embodiment, the optical system satisfies the following conditional expression:
1.1≤TTL/IMGH≤1.3；
the TTL is the distance between the object side surface of the first lens and the imaging surface of the optical system on the optical axis, that is, the total optical length of the optical system, and the IMGH is the radius of the maximum effective imaging circle of the optical system, that is, half of the image height corresponding to the maximum field angle of the optical system. When the above conditional expression is satisfied, the ratio of the total optical length to the half image height of the optical system can be reasonably configured, which is favorable for shortening the total length of the optical system, realizing ultrathin miniaturized design, and simultaneously, being favorable for obtaining large image surface characteristics of the optical system, thereby being capable of matching the photosensitive element of a higher pixel to obtain high imaging quality, and further being capable of taking the miniaturized design and good imaging quality into consideration.
In one embodiment, the optical system satisfies the following conditional expression:
0.5≤|f2/f123|≤2.5；
wherein f2 is an effective focal length of the second lens, and f123 is a combined focal length of the first lens, the second lens, and the third lens. When the conditional expression is satisfied, the refractive power ratio of the second lens in the front three lenses can be reasonably configured, so that the gentle transition of incident light rays among the front three lenses of the optical system is facilitated, the deflection angle of marginal view field light rays is reduced, the refractive power burden of the deflection light rays of each lens (namely the fourth lens to the ninth lens) of the third lens image side is reduced, the design and manufacturing sensitivity of the optical system are reduced, meanwhile, the generation of aberration which is difficult to correct by the front three lenses is avoided, and the imaging quality of the optical system is improved; in addition, the reasonable configuration of the negative refractive power contribution of the second lens is beneficial to shortening the total length of the optical system and realizing miniaturization design, and in addition, the surface type of the second lens is beneficial to preventing excessive bending, so that the processability of the second lens can be improved, and the molding difficulty of the second lens is reduced. Below the lower limit of the conditional expression, the refractive power of the second lens is too strong, and the surface shape of the second lens is excessively bent, which is not beneficial to the processing and forming of the second lens; exceeding the upper limit of the above conditional expression, the negative refractive power of the second lens element is too weak, which is disadvantageous in balancing the positive refractive powers of the first lens element and the third lens element, and thus is disadvantageous in suppressing aberrations.
In one embodiment, the optical system satisfies the following conditional expression:
1.5≤|(R1+R2)/(R1-R2)|≤2；
wherein R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, and R2 is a radius of curvature of the image side surface of the first lens element at the optical axis. When the above conditional expression is satisfied, the radii of curvature of the object side surface and the image side surface of the first lens can be reasonably configured, so that the shape of the first lens is reasonably configured, the spherical aberration contribution of the first lens is reasonably configured, the imaging quality of the field of view on the optical axis and the field of view outside the optical axis cannot be obviously degraded due to the change of the spherical aberration contribution, the optical performance of the optical system is improved, and meanwhile, the surface shape of the first lens cannot be excessively bent, so that the processing and forming of the first lens are facilitated.
In one embodiment, the optical system satisfies the following conditional expression:
1.8≤|f1/f9|≤2.2；
wherein f1 is an effective focal length of the first lens, and f9 is an effective focal length of the ninth lens. When the above conditional expression is satisfied, the proportional relation of the effective focal lengths of the first lens and the ninth lens can be reasonably configured, which is favorable for reasonably distributing the focal power of the optical system, thereby being favorable for correcting the chromatic aberration and the field curvature of the optical system, reducing the deflection angle of light rays and further being favorable for improving the imaging quality of the optical system.
In one embodiment, the optical system satisfies the following conditional expression:
1.5≤|f8/f9|≤4；
wherein f8 is an effective focal length of the eighth lens, and f9 is an effective focal length of the ninth lens. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the eighth lens and the ninth lens of the imaging surface close to the rear end can be reasonably configured, which is favorable for reasonably configuring the focal power of the rear end of the optical system, thereby being favorable for correcting chromatic aberration and field curvature of the optical system, and further favorable for canceling negative spherical aberration generated by the eighth lens and positive spherical aberration generated by the ninth lens, thereby improving the imaging quality of the optical system.
In one embodiment, the optical system satisfies the following conditional expression:
0.9≤∑ET/∑CT≤1.1；
the sum of distances from the maximum effective aperture of the object side surface of each lens in the first lens to the maximum effective aperture of the image side surface of each lens in the ninth lens in the optical axis direction is the sum of edge thicknesses of each lens in the optical system, wherein the edge thickness of a certain lens can be understood as the distance from the maximum effective aperture of the object side surface of the lens to the maximum effective aperture of the image side surface of the lens in the optical axis direction, and Σct is the sum of thicknesses of each lens in the first lens to the ninth lens in the optical axis direction, namely the sum of center thicknesses of each lens in the optical system. When the above conditions are met, the edge thickness and the center thickness of each lens can be reasonably balanced, so that the space utilization rate is improved, and the processing and assembling difficulties of each lens are reduced; and, while being favorable to shortening the overall length of the optical system, also favorable to enhancing the ability of the optical system to correct aberrations, thereby compromise miniaturized design and high imaging quality. When the upper limit of the conditional expression is exceeded, the edge thickness of each lens is too large, so that assembly difference can be caused, the assembly yield of an optical system is reduced, meanwhile, the lens is not beneficial to effectively correcting aberration, the sensitivity of system performance change is increased, and the improvement of imaging quality is not beneficial; when the thickness of the edge of each lens is lower than the lower limit of the conditional expression, the design of the appearance of the lens barrel is difficult and the promotion of the assembly process is not facilitated.
In one embodiment, the optical system satisfies the following conditional expression:
1≤SD72/SD71≤1.3；
SD72 is the maximum effective half-caliber of the image side surface of the seventh lens, and SD71 is the maximum effective half-caliber of the object side surface of the seventh lens. When the conditional expression is satisfied, the maximum effective calibers of the object side surface and the image side surface of the seventh lens can be reasonably configured, so that smooth transition of light rays in the seventh lens is facilitated, generation of off-axis aberration is favorably inhibited, and imaging quality of an optical system is further improved; meanwhile, the radial dimension of the seventh lens is also facilitated to be reduced, so that the design of the small head part of the optical system is facilitated, the size of an opening of the optical system on the screen of the electronic equipment can be reduced when the optical system is applied to the electronic equipment, and the screen occupation ratio of the electronic equipment is further facilitated to be improved; in addition, the workability of the seventh lens is improved, and the aperture of the optical system is enlarged, so that the light flux of the optical system is improved, and the imaging quality of the optical system is improved. Below the lower limit of the above condition, the degree of deflection of the incident ray at the seventh lens is too large, and off-axis aberration is easily increased, thereby causing degradation of imaging quality of the optical system; when the upper limit of the above conditional expression is exceeded, the radial dimension of the seventh lens is excessively large, which is not favorable for the small-head design of the optical system.
In one embodiment, the optical system satisfies the following conditional expression:
36≤f*FNO/T34≤72；
wherein FNO is the f-number of the optical system, and T34 is the distance between the image side surface of the third lens element and the object side surface of the fourth lens element on the optical axis. When the above conditional expression is satisfied, the total length of the optical system is advantageously shortened to satisfy the requirement of miniaturized design, and the light flux of the optical system is also advantageously increased, so that the imaging requirement of high image quality and high definition of the optical system is satisfied. When the distance between the third lens and the fourth lens is smaller than the lower limit of the conditional expression, the total length of the optical system is increased, and the requirement of miniaturization design is difficult to meet; when the upper limit of the conditional expression is exceeded, the light flux of the optical system is insufficient, so that the accuracy of capturing images by the optical system is not high, and the design requirement of high-resolution imaging quality of the optical system is not met.
In one embodiment, the optical system satisfies the following conditional expression:
0.4≤CT3/(CT1+CT2+CT3)≤0.5；
wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis. When the above conditional expression is satisfied, the ratio of the center thickness of the third lens in the front lens group formed by the first lens to the third lens can be reasonably configured, so that the center thickness of the third lens cannot be too thick or too thin, thereby being beneficial to improving the processing and assembly yield of the front lens group.
In one embodiment, the optical system satisfies the following conditional expression:
2.5≤∑CT/(CT1+CT2+CT3)≤3；
wherein Σct is the sum of the thicknesses of the lenses of the first lens to the ninth lens on the optical axis, that is, the sum of the thicknesses of the centers of the lenses of the optical system, CT1 is the thickness of the first lens on the optical axis, that is, the center thickness of the first lens, CT2 is the thickness of the second lens on the optical axis, that is, the center thickness of the second lens, and CT3 is the thickness of the third lens on the optical axis, that is, the center thickness of the third lens. When the above conditional expression is satisfied, the ratio of the sum of the center thicknesses of all lenses to the sum of the center thicknesses of the front three lenses can be reasonably configured, so that the ratio of the center thicknesses of the front three lenses in the optical system is reasonably configured, the sum of the center thicknesses of the front three lenses is not too large or too small, further the processing and forming of the front three lenses are facilitated, the sensitivity of the center thicknesses of the front three lenses is reduced, and the forming and assembling yield of the front three lenses is improved.
An image capturing module includes a photosensitive element and the optical system according to any of the above embodiments, where the photosensitive element is disposed on an image side of the optical system. The optical system is adopted in the image capturing module, so that the wide-angle characteristic, the miniaturized design and the realization of good imaging quality can be considered.
An electronic device comprises a shell and the image capturing module, wherein the image capturing module is arranged on the shell. The electronic equipment adopts the image capturing module, so that the wide-angle characteristic, the miniaturized design and the realization of good imaging quality can be considered.
Drawings
Fig. 1 is a schematic structural view of an optical system in a first embodiment of the present application;
FIG. 2 is a longitudinal spherical aberration, astigmatism and distortion chart of an optical system according to a first embodiment of the present application;
FIG. 3 is a schematic diagram of an optical system according to a second embodiment of the present application;
FIG. 4 is a longitudinal spherical aberration, astigmatism and distortion chart of an optical system according to a second embodiment of the present application;
fig. 5 is a schematic structural view of an optical system in a third embodiment of the present application;
FIG. 6 is a longitudinal spherical aberration, astigmatism and distortion chart of an optical system according to a third embodiment of the present application;
fig. 7 is a schematic structural view of an optical system in a fourth embodiment of the present application;
FIG. 8 is a longitudinal spherical aberration, astigmatism and distortion chart of an optical system according to a fourth embodiment of the present application;
fig. 9 is a schematic structural view of an optical system in a fifth embodiment of the present application;
FIG. 10 is a longitudinal spherical aberration, astigmatism and distortion chart of an optical system according to a fifth embodiment of the present application;
FIG. 11 is a schematic diagram of an image capturing module according to an embodiment of the present application;
fig. 12 is a schematic diagram of an electronic device according to an embodiment of the application.
Detailed Description
In order that the above objects, features and advantages of the application will be readily understood, a more particular description of the application will be rendered by reference to the appended drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. The present application may be embodied in many other forms than described herein and similarly modified by those skilled in the art without departing from the spirit of the application, whereby the application is not limited to the specific embodiments disclosed below.
In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. 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.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
It will be understood that when an element is referred to as being "fixed" or "disposed" on another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
Referring to fig. 1, in some embodiments of the present application, the optical system 100 includes, in order from an object side to an image side along an optical axis 110, 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 ninth lens L9. Specifically, the first lens element L1 comprises an object-side surface S1 and an image-side surface S2, the second lens element L2 comprises an object-side surface S3 and an image-side surface S4, the third lens element L3 comprises an object-side surface S5 and an image-side surface S6, the fourth lens element L4 comprises an object-side surface S7 and an image-side surface S8, the fifth lens element L5 comprises an object-side surface S9 and an image-side surface S10, the sixth lens element L6 comprises an object-side surface S11 and an image-side surface S12, the seventh lens element L7 comprises an object-side surface S13 and an image-side surface S14, the eighth lens element L8 comprises an object-side surface S15 and an image-side surface S16, and the ninth lens element L9 comprises an object-side surface S17 and an image-side surface S18. 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, the eighth lens L8 and the ninth lens L9 are coaxially disposed, and an axis common to the lenses in the optical system 100 is an optical axis 110 of the optical system 100. In some embodiments, the optical system 100 further includes an imaging surface S21 located at the image side of the ninth lens L9, and the incident light can be imaged on the imaging surface S21 after being adjusted by 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, the eighth lens L8 and the ninth lens L9.
The first lens element L1 with positive refractive power has a convex object-side surface S1 and a concave image-side surface S2 at a paraxial region 110, which are beneficial to converging incident light rays with a large angle, thereby reducing the overall length of the optical system 100. The second lens element L2 with negative refractive power has a convex-concave shape at a paraxial region 110 in cooperation with the second lens element L2, which is beneficial to balancing aberrations generated by the first lens element L1, thereby improving an imaging quality of the optical system 100. The third lens element L3 with positive refractive power has a convex-concave shape at a paraxial region 110 in cooperation with the third lens element L3, so that incident light passing through the first lens element L1 and the second lens element L2 can be smoothly transmitted, and the positive and negative refractive power can be matched with each other to counteract aberrations generated by the two lens elements. The object-side surface S5 of the third lens element L3 is convex at the paraxial region 110, and the image-side surface S6 is concave at the paraxial region 110. The fourth lens element L4 with refractive power has a concave image-side surface S8 at a paraxial region 110. The fifth lens element L5 with refractive power has an object-side surface S9 of the fifth lens element L5 being convex at a paraxial region 110. The sixth lens element L6 with refractive power. The surface-type configurations of the fourth lens element L4 to the seventh lens element L7 balance the refractive power burden of the front lens element (i.e., the first lens element L1 to the third lens element L3) and the rear lens element (i.e., the eighth lens element L8 and the ninth lens element L9) to avoid aberrations that are difficult to correct, and the fourth lens element L4 has a concave image-side surface S8 at the paraxial region 110 and a convex surface at the paraxial region in combination with the fifth lens element L5. The seventh lens element L7 with refractive power. The concave-convex surface shape of the seventh lens element L7 at the paraxial region 110 is matched with the concave-convex surface shape of the eighth lens element L8 at the paraxial region 110, so as to reduce the deflection angle of light and reduce the risk of ghost images. The eighth lens element L8 with positive refractive power and the ninth lens element L9 with negative refractive power balance each other, thereby being beneficial to correcting aberration of the optical system 100. The image-side surface S16 of the eighth lens element L8 and the image-side surface S18 of the ninth lens element L9 are concave at the paraxial region 110, which is beneficial to compressing the back focal length of the optical system 100 and thus shortening the overall length of the optical system 100. The biconcave shape of the ninth lens L9 is beneficial to making the marginal field light effectively incident on the imaging surface S21, thereby improving the relative brightness of the imaging surface S21 and further improving the imaging quality of the optical system 100.
In some embodiments, at least one of the object-side surface S17 and the image-side surface S18 of the ninth lens element L9 has a inflection point, e.g., the object-side surface S17 and the image-side surface S18 of the ninth lens element L9 may each have an inflection point. The inflection point can balance the refractive power distribution in the vertical axis direction, thereby being beneficial to correcting the aberration of the off-axis field of view and improving the imaging quality of the optical system 100.
In addition, in some embodiments, the optical system 100 is provided with a stop STO, which may be disposed on the object side of the first lens L1 or between any two lenses, for example, the stop STO is disposed on the object side of the first lens L1. In some embodiments, the optical system 100 further includes an infrared filter L10 disposed on the image side of the ninth lens L9. The infrared filter L10 may be an infrared cut filter, and is used for filtering out interference light, so as to prevent the interference light from reaching the imaging surface S21 of the optical system 100 to affect normal imaging.
In some embodiments, the object side and the image side of each lens of the optical system 100 are both aspheric. The adoption of the aspheric structure can improve the flexibility of lens design, effectively correct spherical aberration and improve imaging quality. In other embodiments, the object side and image side of each lens of the optical system 100 may be spherical. It should be noted that the above embodiments are merely examples of some embodiments of the present application, and in some embodiments, the surfaces of the lenses in the optical system 100 may be aspherical or any combination of spherical surfaces.
In some embodiments, the materials of the lenses in the optical system 100 may be glass or plastic. The plastic lens can reduce the weight of the optical system 100 and the production cost, and the small size of the optical system 100 is matched to realize the light and thin design of the optical system 100. The lens made of glass material provides the optical system 100 with excellent optical performance and high temperature resistance. It should be noted that the materials of the lenses in the optical system 100 may be any combination of glass and plastic, and are not necessarily all glass or all plastic.
It should be noted that the first lens L1 does not mean that there is only one lens, and in some embodiments, there may be two or more lenses in the first lens L1, where the two or more lenses can form a cemented lens, a surface of the cemented lens closest to the object side may be referred to as an object side surface S1, and a surface closest to the image side may be referred to as an image side surface S2. Alternatively, the first lens L1 does not have a cemented lens, but the distance between the lenses is relatively constant, and the object side surface of the lens closest to the object side is the object side surface S1, and the image side surface of the lens closest to the image side is the image side surface S2. In addition, the number of lenses in the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, the eighth lens L8, or the ninth lens L9 in some embodiments may be greater than or equal to two, and any adjacent lenses may form a cemented lens therebetween or may be a non-cemented lens.
Further, in some embodiments, the optical system 100 satisfies the conditional expression: f/tan (HFOV) of 6.8mm or less and 7.4mm or less; where f is the effective focal length of the optical system and HFOV is half the maximum field angle of the optical system. Specifically, the f/tan (HFOV) may be: 6.850, 6.893, 6.925, 6.944, 7.025, 7.067, 7.128, 7.226, 7.235 or 7.382 in mm. When the above conditional expression is satisfied, the effective focal length and the maximum field angle of the optical system 100 can be reasonably configured, which is favorable for expanding the field angle of the optical system 100 to realize the wide-angle characteristic, so that the optical system 100 can acquire more scene contents, thereby enriching the imaging information of the optical system 100, and simultaneously, being favorable for suppressing the distortion of the optical system 100, thereby improving the imaging quality of the optical system 100, and in addition, being favorable for shortening the total length of the optical system 100 and realizing the miniaturized design. Thus, the optical system 100 can achieve both wide-angle characteristics, a compact design, and good imaging quality. When the angle of view of the optical system 100 is smaller than the lower limit of the above conditional expression, the distortion of the off-axis field is easily caused to be too large, so that the distortion phenomenon occurs at the periphery of the image, the reduction degree of the image is reduced, and the improvement of the imaging quality is not facilitated. Beyond the upper limit of the above conditional expression, the effective focal length of the optical system 100 is excessively long, which makes it difficult to effectively compress the total length of the optical system 100, thereby increasing the volume of the optical system 100, which is disadvantageous in the miniaturization design of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: IMGH of 6.15mm or less 2 TTL is less than or equal to 6.55mm; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective imaging circle of the optical system 100. Specifically, IMGH 2 the/TTL can be: 6.178, 6.192, 6.220, 6.273, 6.338, 6.396, 6.455, 6.485, 6.511 or 6.541. When the above conditional expression is satisfied, the total length and half image height of the optical system 100 can be reasonably configured, so that the optical system 100 can achieve both a compact design and a large image plane characteristic, and can also have good imaging quality while having a compact structure.
In some embodiments, the optical system 100 satisfies the conditional expression: TTL/IMGH is less than or equal to 1.1 and less than or equal to 1.3; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective imaging circle of the optical system 100. Specifically, the TTL/IMGH may be: 1.166, 1.169, 1.173, 1.188, 1.192, 1.195, 1.203, 1.215, 1.220, or 1.227. When the above conditional expression is satisfied, the ratio of the total optical length to the half image height of the optical system 100 can be reasonably configured, which is favorable for shortening the total length of the optical system 100, realizing ultra-thin miniaturized design, and simultaneously, being favorable for the optical system 100 to obtain large image surface characteristics, so that the photosensitive elements of higher pixels can be matched to obtain high imaging quality, and further, the optical system 100 can be compatible with miniaturized design and good imaging quality.
It should be noted that, in some embodiments, the optical system 100 may match a photosensitive element having a rectangular photosensitive surface, and the imaging surface S21 of the optical system 100 coincides with the photosensitive surface of the photosensitive element. At this time, the effective pixel area on the imaging surface S21 of the optical system 100 has a horizontal direction and a diagonal direction, and the maximum field angle of the optical system 100 may be understood as the maximum field angle of the optical system 100 in the diagonal direction, and IMGH may be understood as half the length of the effective pixel area on the imaging surface S21 of the optical system 100 in the diagonal direction.
In some embodiments, the optical system 100 satisfies the conditional expression: the |f2/f123| is more than or equal to 0.5 and less than or equal to 2.5; wherein f2 is the effective focal length of the second lens L2, and f123 is the combined focal length of the first lens L1, the second lens L2, and the third lens L3. Specifically, |f2/f123| may be: 0.869, 0.942, 1.237, 1.441, 1.556, 1.663, 1.747, 1.938, 2.025, or 2.105. When the above conditional expression is satisfied, the refractive power ratio of the second lens L2 in the first three lenses can be reasonably configured, which is favorable for smooth transition of incident light between the first three lenses of the optical system 100, so as to be favorable for reducing the deflection angle of marginal view field light, reducing the refractive power burden of the third lens L3 for deflecting light by each lens (i.e., the fourth lens L4 to the ninth lens L9) in the image space, further being favorable for reducing the design and manufacturing sensitivity of the optical system 100, and also being favorable for avoiding the aberration which is difficult to correct by the first three lenses, thereby being favorable for improving the imaging quality of the optical system 100; in addition, the reasonable arrangement of the negative refractive power contribution of the second lens element L2 is advantageous in shortening the overall length of the optical system 100 and realizing a compact design, and in addition, the surface shape of the second lens element L2 is also advantageous in preventing excessive bending, so that the workability of the second lens element L2 can be improved, and the molding difficulty of the second lens element L2 can be reduced. Below the lower limit of the above conditional expression, the refractive power of the second lens element L2 is too strong, and the surface shape of the second lens element L2 is excessively curved, which is not beneficial to the processing and molding of the second lens element L2; exceeding the upper limit of the above conditional expression, the negative refractive power of the second lens element L2 is too weak, which is disadvantageous in balancing the positive refractive powers of the first lens element L1 and the third lens element L3, and thus is disadvantageous in suppressing aberrations.
In some embodiments, the optical system 100 satisfies the conditional expression: (R1+R2)/(R1-R2) is less than or equal to 1.5 and less than or equal to 2; wherein R1 is a radius of curvature of the object side surface S1 of the first lens element L1 at the optical axis 110, and R2 is a radius of curvature of the image side surface S2 of the first lens element L1 at the optical axis 110. Specifically, | (r1+r2)/(R1-R2) | may be: 1.668, 1.682, 1.693, 1.744, 1.763, 1.825, 1.837, 1.855, 1.904, or 1.991. When the above conditional expression is satisfied, the radii of curvature of the object side surface S1 and the image side surface S2 of the first lens L1 can be reasonably configured, so that the shape of the first lens L1 is reasonably configured, which is beneficial to reasonably configuring the spherical aberration contribution of the first lens L1, so that the imaging quality of the field of view on the optical axis 110 and the field of view outside the optical axis 110 cannot be obviously degraded due to the change of the spherical aberration contribution, thereby improving the optical performance of the optical system 100, and meanwhile, the surface shape of the first lens L1 cannot be excessively curved, thereby being beneficial to the processing and forming of the first lens L1.
In some embodiments, the optical system 100 satisfies the conditional expression: 1.8 is less than or equal to |f1/f9 is less than or equal to 2.2; wherein f1 is an effective focal length of the first lens, and f9 is an effective focal length of the ninth lens. Specifically, |f1/f9| may be: 1.889, 1.902, 1.935, 1.957, 1.976, 1.989, 1.993, 2.052, 2.099 or 2.133. When the above conditional expression is satisfied, the proportional relation of the effective focal lengths of the first lens L1 and the ninth lens L9 can be reasonably configured, which is favorable for reasonably distributing the optical power of the optical system 100, thereby being favorable for correcting the chromatic aberration and the field curvature of the optical system 100, reducing the deflection angle of light, and further being favorable for improving the imaging quality of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: 1.5-4; wherein f8 is the effective focal length of the eighth lens L8, and f9 is the effective focal length of the ninth lens L9. Specifically, |f8/f9| may be: 1.791, 1.954, 2.132, 2.451, 2.663, 2.897, 3.025, 3.324, 3.569, or 3.650. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the eighth lens L8 and the ninth lens L9 of the imaging surface S21 near the rear end can be reasonably configured, which is favorable for reasonably configuring the optical power of the rear end of the optical system 100, thereby being favorable for correcting the chromatic aberration and the field curvature of the optical system 100, and in addition, being favorable for canceling the negative spherical aberration generated by the eighth lens L8 and the positive spherical aberration generated by the ninth lens L9, thereby improving the imaging quality of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: sigma ET/Sigma CT is more than or equal to 0.9 and less than or equal to 1.1; wherein Σet is the sum of distances from the maximum effective aperture of the object side surface to the maximum effective aperture of the image side surface of each lens in the first lens to the ninth lens in the optical axis direction, and Σct is the sum of thicknesses of each lens in the first lens to the ninth lens in the optical axis direction. Specifically, Σet/Σct may be: 0.999, 1.002, 1.008, 1.013, 1.015, 1.027, 1.029, 1.033, 1.055 or 1.065. When the above conditions are met, the edge thickness and the center thickness of each lens can be reasonably balanced, so that the space utilization rate is improved, and the processing and assembling difficulties of each lens are reduced; and, while contributing to shortening the overall length of the optical system 100, it contributes to enhancing the ability of the optical system 100 to correct aberrations, thereby achieving both a compact design and high imaging quality. When the upper limit of the above conditional expression is exceeded, the edge thickness of each lens is too large, which may cause assembly difference, thereby reducing the assembly yield of the optical system 100, and meanwhile, being unfavorable for each lens to effectively correct aberration, increasing the sensitivity of system performance variation, and thus being unfavorable for improving imaging quality; when the thickness of the edge of each lens is lower than the lower limit of the conditional expression, the design of the appearance of the lens barrel is difficult and the promotion of the assembly process is not facilitated.
In some embodiments, the optical system 100 satisfies the conditional expression: SD72/SD71 is more than or equal to 1 and less than or equal to 1.3; here, SD72 is the maximum effective half-caliber of the image side surface S14 of the seventh lens L7, and SD71 is the maximum effective half-caliber of the object side surface S13 of the seventh lens L7. Specifically, SD72/SD71 may be: 1.086, 1.095, 1.123, 1.157, 1.173, 1.192, 1.225, 1.237, 1.240, or 1.246. When the above conditional expression is satisfied, the maximum effective aperture of the object side surface S13 and the image side surface S14 of the seventh lens L7 can be reasonably configured, which is favorable for smooth transition of light in the seventh lens L7, thereby being favorable for suppressing generation of off-axis aberration and further improving imaging quality of the optical system 100; meanwhile, the radial dimension of the seventh lens L7 is also facilitated to be reduced, so that the small head design of the optical system 100 is facilitated, when the optical system 100 is applied to electronic equipment, the size of an opening of the optical system 100 on a screen of the electronic equipment can be reduced, and the screen occupation ratio of the electronic equipment is further facilitated to be improved; in addition, the workability of the seventh lens L7 is also facilitated to be improved, and the aperture of the optical system 100 is facilitated to be enlarged, so that the light flux of the optical system 100 is improved, and further the imaging quality of the optical system 100 is facilitated to be improved. Below the lower limit of the above conditional expression, the degree of deflection of the incident light ray at the seventh lens L7 is too large, and off-axis aberration is liable to increase, resulting in degradation of imaging quality of the optical system 100; if the upper limit of the above conditional expression is exceeded, the radial dimension of the seventh lens L7 is too large, which is disadvantageous for the small-head design of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: f is more than or equal to 36 and FNO/T34 is less than or equal to 72; where FNO is the f-number of the optical system 100, T34 is the distance between the image side S6 of the third lens element L3 and the object side S7 of the fourth lens element L4 on the optical axis 110. Specifically, f×FNO/T34 may be: 36.687, 40.521, 44, 369, 49.052, 52.338, 57.698, 61.324, 65.362, 69.668 or 71.064. When the above conditional expression is satisfied, it is advantageous to shorten the total length of the optical system 100 to satisfy the requirement of miniaturization design, and to increase the light flux of the optical system 100, so as to satisfy the imaging requirement of high image quality and high definition of the optical system 100. Below the lower limit of the above conditional expression, the distance between the third lens L3 and the fourth lens L4 is too large, and the total length of the optical system 100 increases, which makes it difficult to meet the demand for miniaturization design; when the upper limit of the above conditional expression is exceeded, the light flux of the optical system 100 is insufficient, resulting in low accuracy in capturing an image by the optical system 100, which is unfavorable for meeting the design requirements of high-resolution imaging quality of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: CT 3/(CT 1+ CT2+ CT 3) is more than or equal to 0.4 and less than or equal to 0.5; wherein, CT1 is the thickness of the first lens L1 on the optical axis 110, CT2 is the thickness of the second lens L2 on the optical axis 110, and CT3 is the thickness of the third lens L3 on the optical axis 110. Specifically, CT 3/(CT 1+ct2+ct 3) may be: 2.676, 2.689, 2.713, 2.725, 2.733, 2.755, 2.789, 2.833, 2.854, or 2.887. When the above conditional expression is satisfied, the ratio of the center thickness of the third lens L3 in the front lens group formed by the first lens L1 to the third lens L3 can be reasonably configured, so that the center thickness of the third lens L3 is not too thick or too thin, thereby being beneficial to improving the processing and assembly yield of the front lens group.
In some embodiments, the optical system 100 satisfies the conditional expression: sigma CT/(CT1+CT2+CT3) is more than or equal to 2.5 and less than or equal to 3; wherein Σct is the sum of the thicknesses of the first lens element L1 to the ninth lens element L9 on the optical axis 110, CT1 is the thickness of the first lens element L1 on the optical axis 110, CT2 is the thickness of the second lens element L2 on the optical axis 110, and CT3 is the thickness of the third lens element L3 on the optical axis 110. Specifically, Σct/(CT 1+ct2+ct 3) may be: 2.676, 2.683, 2.694, 2.741, 2.768, 2.789, 2.803, 2.855, 2.869 or 2.887. When the above conditional expression is satisfied, the ratio of the sum of the center thicknesses of all the lenses to the sum of the center thicknesses of the front three lenses can be reasonably configured, so that the ratio of the center thicknesses of the front three lenses in the optical system 100 is reasonably configured, the sum of the center thicknesses of the front three lenses is not too large or too small, further the processing and forming of the front three lenses are facilitated, the sensitivity of the center thicknesses of the front three lenses is reduced, and the forming and assembling yield of the front three lenses is improved.
The reference wavelengths for the above effective focal length and combined focal length values are 555nm.
From the above description of the embodiments, more particular embodiments and figures are set forth below in detail.
First embodiment
Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of an optical system 100 in a first embodiment, wherein the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8 with positive refractive power, and a ninth lens L9 with negative refractive power. Fig. 2 is a graph of longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the first embodiment, from left to right, where the reference wavelength of the astigmatism graph and the distortion graph is 555nm, and other embodiments are the same.
The object side surface S1 of the first lens element L1 is convex at the paraxial region 110, and the image side surface S2 is concave at the paraxial region 110;
the object side surface S3 of the second lens element L2 is convex at the paraxial region 110, and the image side surface S4 is concave at the paraxial region 110;
the third lens element L3 has a convex object-side surface S5 at a paraxial region 110 and a concave image-side surface S6 at the paraxial region 110;
the fourth lens element L4 has a concave object-side surface S7 at a paraxial region 110 and a concave image-side surface S8 at the paraxial region 110;
The object side surface S9 of the fifth lens element L5 is convex at the paraxial region 110, and the image side surface S10 is convex at the paraxial region 110;
the object side surface S11 of the sixth lens element L6 is concave at the paraxial region 110, and the image side surface S12 is convex at the paraxial region 110;
the seventh lens element L7 has a concave object-side surface S13 at a paraxial region 110 and a convex image-side surface S14 at the paraxial region 110;
the eighth lens element L8 has a convex object-side surface S15 at the paraxial region 110 and a concave image-side surface S16 at the paraxial region 110;
the object-side surface S17 of the ninth lens element L9 is concave at the paraxial region 110, and the image-side surface S18 is concave at the paraxial region 110.
The object side surfaces and the image side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 are aspheric.
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, the eighth lens L8 and the ninth lens L9 are all plastics.
Further, the optical system 100 satisfies the conditional expression: f/tan (HFOV) = 6.854mm; where f is the effective focal length of the optical system and HFOV is half the maximum field angle of the optical system. When the above conditional expression is satisfied, the effective focal length and the maximum field angle of the optical system 100 can be reasonably configured, which is favorable for expanding the field angle of the optical system 100 to realize the wide-angle characteristic, so that the optical system 100 can acquire more scene contents, thereby enriching the imaging information of the optical system 100, and simultaneously, being favorable for suppressing the distortion of the optical system 100, thereby improving the imaging quality of the optical system 100, and in addition, being favorable for shortening the total length of the optical system 100 and realizing the miniaturized design. Thus, the optical system 100 can achieve both wide-angle characteristics, a compact design, and good imaging quality.
The optical system 100 satisfies the conditional expression: IMGH 2 Ttl= 6.541mm; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective imaging circle of the optical system 100. When the above conditional expression is satisfied, the total length and half image height of the optical system 100 can be reasonably configured, so that the optical system 100 can achieve both a compact design and a large image plane characteristic, and can also have good imaging quality while having a compact structure.
The optical system 100 satisfies the conditional expression: TTL/imgh=1.166; wherein TTL is a distance between the object side surface S1 of the first lens L1 and the imaging surface S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective imaging circle of the optical system 100. When the above conditional expression is satisfied, the ratio of the total optical length to the half image height of the optical system 100 can be reasonably configured, which is favorable for shortening the total length of the optical system 100, realizing ultra-thin miniaturized design, and simultaneously, being favorable for the optical system 100 to obtain large image surface characteristics, so that the photosensitive elements of higher pixels can be matched to obtain high imaging quality, and further, the optical system 100 can be compatible with miniaturized design and good imaging quality.
The optical system 100 satisfies the conditional expression: |f2/f123|=2.105; wherein f2 is the effective focal length of the second lens L2, and f123 is the combined focal length of the first lens L1, the second lens L2, and the third lens L3. When the above conditional expression is satisfied, the refractive power ratio of the second lens L2 in the first three lenses can be reasonably configured, which is favorable for smooth transition of incident light between the first three lenses of the optical system 100, so as to be favorable for reducing the deflection angle of marginal view field light, reducing the refractive power burden of the third lens L3 for deflecting light by each lens (i.e., the fourth lens L4 to the ninth lens L9) in the image space, further being favorable for reducing the design and manufacturing sensitivity of the optical system 100, and also being favorable for avoiding the aberration which is difficult to correct by the first three lenses, thereby being favorable for improving the imaging quality of the optical system 100; in addition, the reasonable arrangement of the negative refractive power contribution of the second lens element L2 is advantageous in shortening the overall length of the optical system 100 and realizing a compact design, and in addition, the surface shape of the second lens element L2 is also advantageous in preventing excessive bending, so that the workability of the second lens element L2 can be improved, and the molding difficulty of the second lens element L2 can be reduced.
The optical system 100 satisfies the conditional expression: (r1+r2)/(R1-R2) |=1.991; wherein R1 is a radius of curvature of the object side surface S1 of the first lens element L1 at the optical axis 110, and R2 is a radius of curvature of the image side surface S2 of the first lens element L1 at the optical axis 110. When the above conditional expression is satisfied, the radii of curvature of the object side surface S1 and the image side surface S2 of the first lens L1 can be reasonably configured, so that the shape of the first lens L1 is reasonably configured, which is beneficial to reasonably configuring the spherical aberration contribution of the first lens L1, so that the imaging quality of the field of view on the optical axis 110 and the field of view outside the optical axis 110 cannot be obviously degraded due to the change of the spherical aberration contribution, thereby improving the optical performance of the optical system 100, and meanwhile, the surface shape of the first lens L1 cannot be excessively curved, thereby being beneficial to the processing and forming of the first lens L1.
The optical system 100 satisfies the conditional expression: |f1/f9|=2.125; wherein f1 is an effective focal length of the first lens, and f9 is an effective focal length of the ninth lens. When the above conditional expression is satisfied, the proportional relation of the effective focal lengths of the first lens L1 and the ninth lens L9 can be reasonably configured, which is favorable for reasonably distributing the optical power of the optical system 100, thereby being favorable for correcting the chromatic aberration and the field curvature of the optical system 100, reducing the deflection angle of light, and further being favorable for improving the imaging quality of the optical system 100.
The optical system 100 satisfies the conditional expression: |f8/f9|=1.791; wherein f8 is the effective focal length of the eighth lens L8, and f9 is the effective focal length of the ninth lens L9. When the above conditional expression is satisfied, the ratio of the effective focal lengths of the eighth lens L8 and the ninth lens L9 of the imaging surface S21 near the rear end can be reasonably configured, which is favorable for reasonably configuring the optical power of the rear end of the optical system 100, thereby being favorable for correcting the chromatic aberration and the field curvature of the optical system 100, and in addition, being favorable for canceling the negative spherical aberration generated by the eighth lens L8 and the positive spherical aberration generated by the ninth lens L9, thereby improving the imaging quality of the optical system 100.
The optical system 100 satisfies the conditional expression: Σet/Σct=1.065; wherein Σet is the sum of distances from the maximum effective aperture of the object side surface to the maximum effective aperture of the image side surface of each lens in the first lens to the ninth lens in the optical axis direction, and Σct is the sum of thicknesses of each lens in the first lens to the ninth lens in the optical axis direction. When the above conditions are met, the edge thickness and the center thickness of each lens can be reasonably balanced, so that the space utilization rate is improved, and the processing and assembling difficulties of each lens are reduced; and, while contributing to shortening the overall length of the optical system 100, it contributes to enhancing the ability of the optical system 100 to correct aberrations, thereby achieving both a compact design and high imaging quality.
The optical system 100 satisfies the conditional expression: SD72/SD71 = 1.131; here, SD72 is the maximum effective half-caliber of the image side surface S14 of the seventh lens L7, and SD71 is the maximum effective half-caliber of the object side surface S13 of the seventh lens L7. When the above conditional expression is satisfied, the maximum effective aperture of the object side surface S13 and the image side surface S14 of the seventh lens L7 can be reasonably configured, which is favorable for smooth transition of light in the seventh lens L7, thereby being favorable for suppressing generation of off-axis aberration and further improving imaging quality of the optical system 100; meanwhile, the radial dimension of the seventh lens L7 is also facilitated to be reduced, so that the small head design of the optical system 100 is facilitated, when the optical system 100 is applied to electronic equipment, the size of an opening of the optical system 100 on a screen of the electronic equipment can be reduced, and the screen occupation ratio of the electronic equipment is further facilitated to be improved; in addition, the workability of the seventh lens L7 is also facilitated to be improved, and the aperture of the optical system 100 is facilitated to be enlarged, so that the light flux of the optical system 100 is improved, and further the imaging quality of the optical system 100 is facilitated to be improved.
The optical system 100 satisfies the conditional expression: f is FNO/t34= 36.687; where FNO is the f-number of the optical system 100, T34 is the distance between the image side S6 of the third lens element L3 and the object side S7 of the fourth lens element L4 on the optical axis 110. When the above conditional expression is satisfied, it is advantageous to shorten the total length of the optical system 100 to satisfy the requirement of miniaturization design, and to increase the light flux of the optical system 100, so as to satisfy the imaging requirement of high image quality and high definition of the optical system 100.
The optical system 100 satisfies the conditional expression: CT 3/(CT 1+ CT2+ CT 3) =2.887; wherein, CT1 is the thickness of the first lens L1 on the optical axis 110, CT2 is the thickness of the second lens L2 on the optical axis 110, and CT3 is the thickness of the third lens L3 on the optical axis 110. When the above conditional expression is satisfied, the ratio of the center thickness of the third lens L3 in the front lens group formed by the first lens L1 to the third lens L3 can be reasonably configured, so that the center thickness of the third lens L3 is not too thick or too thin, thereby being beneficial to improving the processing and assembly yield of the front lens group.
The optical system 100 satisfies the conditional expression: Σct/(CT 1+ CT2+ CT 3) =2.887; wherein Σct is the sum of the thicknesses of the first lens element L1 to the ninth lens element L9 on the optical axis 110, CT1 is the thickness of the first lens element L1 on the optical axis 110, CT2 is the thickness of the second lens element L2 on the optical axis 110, and CT3 is the thickness of the third lens element L3 on the optical axis 110. When the above conditional expression is satisfied, the ratio of the sum of the center thicknesses of all the lenses to the sum of the center thicknesses of the front three lenses can be reasonably configured, so that the ratio of the center thicknesses of the front three lenses in the optical system 100 is reasonably configured, the sum of the center thicknesses of the front three lenses is not too large or too small, further the processing and forming of the front three lenses are facilitated, the sensitivity of the center thicknesses of the front three lenses is reduced, and the forming and assembling yield of the front three lenses is improved.
In addition, various parameters of the optical system 100 are given in table 1. Wherein the elements from the object plane (not shown) to the imaging plane S21 are sequentially arranged in the order of the elements from top to bottom in table 1. The radius Y in table 1 is the radius of curvature of the object or image side of the corresponding surface number at the optical axis 110. The surface numbers S1 and S2 are the object side surface S1 and the image side surface S2 of the first lens element L1, respectively, i.e., the surface with the smaller surface number is the object side surface and the surface with the larger surface number is the image side surface in the same lens element. The first value in the "thickness" parameter row of the first lens element L1 is the thickness of the lens element on the optical axis 110, and the second value is the distance from the image side surface of the lens element to the rear surface of the image side direction on the optical axis 110.
Note that in this embodiment and the following embodiments, the optical system 100 may not be provided with the infrared filter L10, but the distance from the image side surface S18 to the imaging surface S21 of the ninth lens L9 remains unchanged.
In the first embodiment, the effective focal length f= 7.050mm, the optical total length ttl=8.9 mm, half of the maximum field angle hfov= 45.810deg, and the f-number fno= 2.265 of the optical system 100. As is clear from the descriptions in table 1 and fig. 2, the optical system 100 has a wide-angle characteristic, can satisfy the requirement of wide-range image capturing, can satisfy the requirement of compact design, and has a large image plane characteristic, so that it can match the photosensitive element of a higher pixel to obtain good imaging quality.
The reference wavelength of the focal length of each lens is 555nm, the reference wavelength of the refractive index and the Abbe number is 587.56nm, and other embodiments are the same.
TABLE 1
Further, the aspherical coefficients of the image side or object side of each lens of the optical system 100 are given in table 2. Wherein the plane numbers S1-S18 represent the image side surfaces or the object side surfaces S1-S18, respectively. And K-a20 from top to bottom respectively represent types of aspherical coefficients, where K represents a conic coefficient, A4 represents four times an aspherical coefficient, A6 represents six times an aspherical coefficient, A8 represents eight times an aspherical coefficient, and so on. In addition, the aspherical coefficient formula is as follows:
where Z is the distance from the corresponding point on the aspheric surface to the plane tangential to the surface vertex, r is the distance from the corresponding point on the aspheric surface to the optical axis 110, c is the curvature of the aspheric vertex, K is the conic coefficient, ai is the coefficient corresponding to the i-th higher term in the aspheric surface formula.
TABLE 2
In addition, fig. 2 includes a longitudinal spherical aberration plot (Longitudinal Spherical Aberration) of the optical system 100, the longitudinal spherical aberration plot representing the focus deviation of light rays of different wavelengths after passing through the lens, wherein the ordinate represents the normalized pupil coordinates (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the focus deviation, i.e., the distance (in mm) from the imaging surface S21 to the intersection of the light rays with the optical axis 110. As can be seen from the longitudinal spherical aberration chart, the degree of focus deviation of the light rays of each wavelength in the first embodiment tends to be uniform, and the diffuse spots or the halos in the imaging picture are effectively suppressed. Fig. 2 also includes an astigmatic curve diagram (ASTIGMATIC FIELD CURVES) of the optical system 100, wherein the abscissa represents the focus offset, the ordinate represents the image height in mm, and the S-curve in the astigmatic curve represents the sagittal field curve at 555nm and the T-curve represents the meridional field curve at 555 nm. As can be seen from the figure, the field curvature of the optical system 100 is small, the field curvature and astigmatism of each field of view are well corrected, and the center and the edge of the field of view have clear imaging. Fig. 2 also includes a DISTORTION graph (DISTORTION) of the optical system 100, where the DISTORTION graph represents DISTORTION magnitude values for different field angles, and where the abscissa represents DISTORTION value in% and the ordinate represents image height in mm. As can be seen from the figure, the image distortion caused by the main beam is small, and the imaging quality of the system is excellent.
Second embodiment
Referring to fig. 3 and 4, fig. 3 is a schematic structural diagram of an optical system 100 in a second embodiment, wherein the optical system 100 sequentially includes, from an object side to an image side, a stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, an eighth lens L8 with positive refractive power, and a ninth lens L9 with negative refractive power. Fig. 4 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment in order from left to right.
The object side surface S1 of the first lens element L1 is convex at the paraxial region 110, and the image side surface S2 is concave at the paraxial region 110;
the object side surface S3 of the second lens element L2 is convex at the paraxial region 110, and the image side surface S4 is concave at the paraxial region 110;
the third lens element L3 has a convex object-side surface S5 at a paraxial region 110 and a concave image-side surface S6 at the paraxial region 110;
the fourth lens element L4 has a concave object-side surface S7 at a paraxial region 110 and a concave image-side surface S8 at the paraxial region 110;
the object side surface S9 of the fifth lens element L5 is convex at the paraxial region 110, and the image side surface S10 is convex at the paraxial region 110;
The object-side surface S11 of the sixth lens element L6 is convex at the paraxial region 110, and the image-side surface S12 is concave at the paraxial region 110;
the seventh lens element L7 has a concave object-side surface S13 at a paraxial region 110 and a convex image-side surface S14 at the paraxial region 110;
the eighth lens element L8 has a convex object-side surface S15 at the paraxial region 110 and a concave image-side surface S16 at the paraxial region 110;
the object-side surface S17 of the ninth lens element L9 is concave at the paraxial region 110, and the image-side surface S18 is concave at the paraxial region 110.
The object side surfaces and the image side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 are aspheric.
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, the eighth lens L8 and the ninth lens L9 are all plastics.
In addition, the parameters of the optical system 100 are given in table 3, and the definition of the parameters can be obtained in the first embodiment, which is not described herein.
TABLE 3 Table 3
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Further, the aspheric coefficients of the image side or the object side of each lens of the optical system 100 are given in table 4, and the definition of each parameter can be obtained from the first embodiment, which is not described herein.
TABLE 4 Table 4
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From the above provided parameter information, the following data can be deduced:
f/tan(HFOV)(mm) 7.086 ∑ET/∑CT 0.999
TTL/IMGH 1.190 SD72/SD71 1.086
|f2/f123| -1.978 f*FNO/T34 37.218
|(R1+R2)/(R1-R2)| 1.903 ∑CT/(CT1+CT2+CT3) 2.676
|f8/f9| 3.650 IMGH 2 /TTL(mm) 6.350
|f1/f9| 1.889 CT3/(CT1+CT2+CT3) 0.430
in addition, as can be seen from the aberration diagram in fig. 4, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.
Third embodiment
Referring to fig. 5 and 6, fig. 5 is a schematic structural diagram of an optical system 100 in a third embodiment, wherein the optical system 100 sequentially includes, from an object side to an image side, a stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8 with positive refractive power, and a ninth lens L9 with negative refractive power. Fig. 6 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment in order from left to right.
The object side surface S1 of the first lens element L1 is convex at the paraxial region 110, and the image side surface S2 is concave at the paraxial region 110;
the object side surface S3 of the second lens element L2 is convex at the paraxial region 110, and the image side surface S4 is concave at the paraxial region 110;
The third lens element L3 has a convex object-side surface S5 at a paraxial region 110 and a concave image-side surface S6 at the paraxial region 110;
the fourth lens element L4 has a convex object-side surface S7 at a paraxial region 110 and a concave image-side surface S8 at the paraxial region 110;
the object side surface S9 of the fifth lens element L5 is convex at the paraxial region 110, and the image side surface S10 is convex at the paraxial region 110;
the object side surface S11 of the sixth lens element L6 is concave at the paraxial region 110, and the image side surface S12 is concave at the paraxial region 110;
the seventh lens element L7 has a concave object-side surface S13 at a paraxial region 110 and a convex image-side surface S14 at the paraxial region 110;
the eighth lens element L8 has a convex object-side surface S15 at the paraxial region 110 and a concave image-side surface S16 at the paraxial region 110;
the object-side surface S17 of the ninth lens element L9 is concave at the paraxial region 110, and the image-side surface S18 is concave at the paraxial region 110.
The object side surfaces and the image side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 are aspheric.
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, the eighth lens L8 and the ninth lens L9 are all plastics.
In addition, the parameters of the optical system 100 are given in table 5, and the definition of the parameters can be obtained in the first embodiment, which is not described herein.
TABLE 5
Further, the aspheric coefficients of the image side or the object side of each lens of the optical system 100 are given in table 6, and the definition of each parameter can be obtained from the first embodiment, which is not described herein.
TABLE 6
And, according to the above-provided parameter information, the following data can be deduced:
f/tan(HFOV)(mm) 7.382 ∑ET/∑CT 1.024
TTL/IMGH 1.227 SD72/SD71 1.246
|f2/f123| -0.869 f*FNO/T34 71.064
|(R1+R2)/(R1-R2)| 1.668 ∑CT/(CT1+CT2+CT3) 2.863
|f8/f9| 2.349 IMGH 2 /TTL(mm) 6.178
|f1/f9| 1.901 CT3/(CT1+CT2+CT3) 2.863
in addition, as is clear from the aberration diagram in fig. 6, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.
Fourth embodiment
Referring to fig. 7 and 8, fig. 7 is a schematic structural diagram of an optical system 100 in a fourth embodiment, wherein the optical system 100 sequentially includes, from an object side to an image side, a stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8 with positive refractive power, and a ninth lens L9 with negative refractive power. Fig. 8 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment in order from left to right.
The object side surface S1 of the first lens element L1 is convex at the paraxial region 110, and the image side surface S2 is concave at the paraxial region 110;
the object side surface S3 of the second lens element L2 is convex at the paraxial region 110, and the image side surface S4 is concave at the paraxial region 110;
the third lens element L3 has a convex object-side surface S5 at a paraxial region 110 and a concave image-side surface S6 at the paraxial region 110;
the fourth lens element L4 has a convex object-side surface S7 at a paraxial region 110 and a concave image-side surface S8 at the paraxial region 110;
the object side surface S9 of the fifth lens element L5 is convex at the paraxial region 110, and the image side surface S10 is concave at the paraxial region 110;
the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region 110, and the image-side surface S12 is concave at the paraxial region 110;
the seventh lens element L7 has a concave object-side surface S13 at a paraxial region 110 and a convex image-side surface S14 at the paraxial region 110;
the eighth lens element L8 has a convex object-side surface S15 at the paraxial region 110 and a concave image-side surface S16 at the paraxial region 110;
the object-side surface S17 of the ninth lens element L9 is concave at the paraxial region 110, and the image-side surface S18 is concave at the paraxial region 110.
The object side surfaces and the image side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 are aspheric.
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, the eighth lens L8 and the ninth lens L9 are all plastics.
In addition, the parameters of the optical system 100 are given in table 7, and the definition of the parameters can be obtained in the first embodiment, which is not described herein.
TABLE 7
Further, the aspheric coefficients of the image side or the object side of each lens in the optical system 100 are given in table 8, and the definition of each parameter can be obtained from the first embodiment, which is not described herein.
TABLE 8
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And, according to the above-provided parameter information, the following data can be deduced:
f/tan(HFOV)(mm) 7.156 ∑ET/∑CT 1.027
TTL/IMGH 1.205 SD72/SD71 1.232
|f2/f123| -1.139 f*FNO/T34 58.236
|(R1+R2)/(R1-R2)| 1.817 ∑CT/(CT1+CT2+CT3) 2.816
|f8/f9| 2.597 IMGH 2 /TTL(mm) 1.205
|f1/f9| 2.082 CT3/(CT1+CT2+CT3) 0.477
in addition, as is clear from the aberration diagram in fig. 8, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.
Fifth embodiment
Referring to fig. 9 and 10, fig. 9 is a schematic structural diagram of an optical system 100 in a fifth embodiment, wherein the optical system 100 sequentially includes, from an object side to an image side, a stop STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power, an eighth lens L8 with positive refractive power, and a ninth lens L9 with negative refractive power. Fig. 10 is a graph showing longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment in order from left to right.
The object side surface S1 of the first lens element L1 is convex at the paraxial region 110, and the image side surface S2 is concave at the paraxial region 110;
the object side surface S3 of the second lens element L2 is convex at the paraxial region 110, and the image side surface S4 is concave at the paraxial region 110;
the third lens element L3 has a convex object-side surface S5 at a paraxial region 110 and a concave image-side surface S6 at the paraxial region 110;
the fourth lens element L4 has a convex object-side surface S7 at a paraxial region 110 and a concave image-side surface S8 at the paraxial region 110;
the object side surface S9 of the fifth lens element L5 is convex at the paraxial region 110, and the image side surface S10 is concave at the paraxial region 110;
the object-side surface S11 of the sixth lens element L6 is convex at the paraxial region 110, and the image-side surface S12 is concave at the paraxial region 110;
the seventh lens element L7 has a concave object-side surface S13 at a paraxial region 110 and a convex image-side surface S14 at the paraxial region 110;
the eighth lens element L8 has a convex object-side surface S15 at the paraxial region 110 and a concave image-side surface S16 at the paraxial region 110;
the object-side surface S17 of the ninth lens element L9 is concave at the paraxial region 110, and the image-side surface S18 is concave at the paraxial region 110.
The object side surfaces and the image side surfaces of the first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5, the sixth lens element L6, the seventh lens element L7, the eighth lens element L8 and the ninth lens element L9 are aspheric.
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, the eighth lens L8 and the ninth lens L9 are all plastics.
In addition, the parameters of the optical system 100 are given in table 9, and the definition of the parameters can be obtained in the first embodiment, which is not described herein.
TABLE 9
Further, the aspheric coefficients of the image side or the object side of each lens of the optical system 100 are given in table 10, and the definition of each parameter can be obtained from the first embodiment, which is not described herein.
Table 10
And, according to the above-provided parameter information, the following data can be deduced:
f/tan(HFOV)(mm) 6.850 ∑ET/∑CT 1.038
TTL/IMGH 1.185 SD72/SD71 1.231
|f2/f123| -1.284 f*FNO/T34 52.011
|(R1+R2)/(R1-R2)| 1.871 ∑CT/(CT1+CT2+CT3) 2.771
|f8/f9| 2.524 IMGH 2 /TTL(mm) 6.369
|f1/f9| 2.133 CT3/(CT1+CT2+CT3) 2.771
in addition, as is clear from the aberration diagram in fig. 10, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are all well controlled, so that the optical system 100 of this embodiment has good imaging quality.
Referring to fig. 11, in some embodiments, the optical system 100 may be assembled with the photosensitive element 210 to form the image capturing module 200. At this time, the photosensitive surface of the photosensitive element 210 can be regarded as the imaging surface S21 of the optical system 100. The image capturing module 200 may further be provided with an infrared filter L10, where the infrared filter L10 is disposed between the image side surface S18 and the image side surface S21 of the ninth lens element L9. Specifically, the photosensitive element 210 may be a charge coupled element (Charge Coupled Device, CCD) or a complementary metal oxide semiconductor device (Complementary Metal-Oxide Semiconductor Sensor, CMOS Sensor). The optical system 100 is used in the image capturing module 200, and can achieve both wide-angle characteristics, a compact design, and good imaging quality.
Referring to fig. 11 and 12, in some embodiments, the image capturing module 200 may be applied to an electronic device 300, where the electronic device 300 includes a housing 310, and the image capturing module 200 is disposed on the housing 310. Specifically, the electronic device 300 may be, but is not limited to, a portable telephone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image pickup device such as a car recorder, or a wearable device such as a smart watch. When the electronic device 300 is a smart phone, the housing 310 may be a middle frame of the electronic device 300. The adoption of the image capturing module 200 in the electronic device 300 can achieve both wide-angle characteristics, a compact design, and good imaging quality.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.

Claims (10)

1. An optical system, characterized in that the number of lenses with refractive power in the optical system is nine, and the optical system sequentially comprises, from an object side to an image side along an optical axis:
a first lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a second lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a third lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a fourth lens element with refractive power having a concave image-side surface at a paraxial region;
a fifth lens element with refractive power having a convex object-side surface at a paraxial region;
a sixth lens element with refractive power;
a seventh lens element with refractive power having a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
an eighth lens element with positive refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
A ninth lens element with negative refractive power having a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
and the optical system satisfies the following conditional expression:
6.8mm≤f/tan（HFOV）≤7.4mm；
1.8≤|f1/f9|≤2.2；
wherein f is the effective focal length of the optical system, HFOV is half of the maximum field angle of the optical system, f1 is the effective focal length of the first lens, and f9 is the effective focal length of the ninth lens.
2. The optical system according to claim 1, wherein the following conditional expression is satisfied:
6.15mm≤IMGH 2 /TTL≤6.55mm；
wherein IMGH is the radius of the maximum effective imaging circle of the optical system, and TTL is the distance between the object side surface of the first lens and the imaging surface of the optical system on the optical axis.
3. The optical system according to claim 1, wherein the following conditional expression is satisfied:
0.5≤|f2/f123|≤2.5；
wherein f2 is an effective focal length of the second lens, and f123 is a combined focal length of the first lens, the second lens, and the third lens.
4. The optical system according to claim 1, wherein the following conditional expression is satisfied:
1.5≤|（R1+R2）/（R1-R2）|≤2；
wherein R1 is a radius of curvature of the object side surface of the first lens element at the optical axis, and R2 is a radius of curvature of the image side surface of the first lens element at the optical axis.
5. The optical system according to claim 1, wherein the following conditional expression is satisfied:
0.9≤∑ET/∑CT≤1.1；
wherein Σet is the sum of distances from the maximum effective aperture of the object side surface to the maximum effective aperture of the image side surface of each lens in the first lens to the ninth lens in the optical axis direction, and Σct is the sum of thicknesses of each lens in the first lens to the ninth lens in the optical axis direction.
6. The optical system according to claim 1, wherein the following conditional expression is satisfied:
1≤SD72/SD71≤1.3；
SD72 is the maximum effective half-caliber of the image side surface of the seventh lens, and SD71 is the maximum effective half-caliber of the object side surface of the seventh lens.
7. The optical system according to claim 1, wherein the following conditional expression is satisfied:
36≤fFNO/T34≤72；
wherein FNO is the f-number of the optical system, and T34 is the distance between the image side surface of the third lens element and the object side surface of the fourth lens element on the optical axis.
8. The optical system according to claim 1, wherein the following conditional expression is satisfied:
0.4≤CT3/(CT1+CT2+CT3) ≤0.5；
wherein, CT1 is the thickness of the first lens on the optical axis, CT2 is the thickness of the second lens on the optical axis, and CT3 is the thickness of the third lens on the optical axis.
9. An image capturing module comprising a photosensitive element and the optical system of any one of claims 1-8, wherein the photosensitive element is disposed on an image side of the optical system.
10. An electronic device, comprising a housing and the image capturing module of claim 9, wherein the image capturing module is disposed on the housing.
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Citations (4)

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CN113805310A (en) * 2021-09-10 2021-12-17 江西晶超光学有限公司 Optical system, image capturing module and electronic equipment

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