CN114740591A - 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
CN114740591A
CN114740591A CN202210192779.6A CN202210192779A CN114740591A CN 114740591 A CN114740591 A CN 114740591A CN 202210192779 A CN202210192779 A CN 202210192779A CN 114740591 A CN114740591 A CN 114740591A
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China
Prior art keywords
lens
optical system
image
lens element
refractive power
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Granted
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CN202210192779.6A
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CN114740591B (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

Abstract

The invention relates to an optical system, an image capturing module and an electronic device. The optical system includes: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with negative refractive power having a convex object-side surface and a concave image-side surface; a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a fourth lens element with refractive power having a concave image-side surface; a fifth lens element with refractive power having a convex object-side surface; a sixth lens element with refractive power; a seventh lens element with refractive power having 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 less than or equal to 6.8mm and less than or equal to 7.4 mm. The optical system can realize wide-angle characteristics and good imaging quality at the same time.

Description

Optical system, image capturing module and electronic equipment
Technical Field
The present invention relates to the field of camera shooting, and in particular, to an optical system, an image capturing module and an electronic device.
Background
Along with the rapid development of the camera shooting technology, the camera shooting lens is also more and more widely applied to electronic equipment such as smart phones, tablet computers and electronic readers, and for improving the market competitiveness of the electronic equipment, the performance requirement of the industry on the camera shooting lens is also higher and higher. The field angle of the camera lens is one of the important points concerned in the industry, and the large field angle enables the camera lens to acquire more scene information, thereby improving the user experience of the electronic equipment. However, in the current imaging lens, the imaging quality is easily degraded while the wide-angle characteristic is realized, and the image restoration degree is affected.
Disclosure of Invention
Accordingly, it is desirable to provide an optical system, an image capturing module and an electronic device for solving the problem that the current imaging lens is likely to cause a decrease in imaging quality while achieving a wide-angle characteristic.
An optical system includes, 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 and a concave image-side surface;
a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a fourth lens element with refractive power having a concave image-side surface at paraxial region;
a fifth lens element with refractive power having a convex object-side surface at 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 and a concave image-side surface;
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；
wherein f is an effective focal length of the optical system, and the HFOV is half of a 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 respectively convex and concave at the paraxial region, which is favorable for converging large-angle incident light rays and further is favorable for compressing the total length of the optical system. The second lens element with negative refractive power has convex-concave shape at paraxial region, which is favorable 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 near the optical axis, so that incident light passing through the first and second lens elements can be smoothly transmitted, and the positive and negative refractive power lens elements can cancel out aberration generated by each other. The surface configurations 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 the generation of aberration that is 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 with the object-side surface of the fifth lens element for smooth transition of light. The concave-convex surface type of the seventh lens element at the paraxial region is matched with the concave-convex surface type of the eighth lens element at the paraxial region, so that the deflection angle of light can be reduced, and the risk of ghost image generation can be reduced. The eighth lens element with positive refractive power has a negative refractive power balanced with that of the ninth lens element, thereby facilitating correction of 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 both concave surfaces at paraxial regions, which is advantageous for compressing the back focal length of the optical system, thereby shortening the total length of the optical system. The biconcave surface type of ninth lens is favorable to making on the effective incidence imaging surface of marginal visual field light to promote the relative luminance of imaging surface, and then promote optical system's imaging quality.
When the condition formula is satisfied, the effective focal length and the maximum field angle of the optical system can be reasonably configured, the field angle of the optical system can be favorably enlarged to realize wide-angle characteristics, the optical system can acquire more scene contents, the imaging information of the optical system is enriched, meanwhile, the distortion of the optical system can be favorably inhibited, the imaging quality of the optical system is improved, in addition, the total length of the optical system can be favorably shortened, and the miniaturization design is realized. Thus, the optical system can achieve both wide-angle characteristics, 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 of view is easily too large, so that the distortion phenomenon occurs on 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 becomes too long, and the total length of the optical system is difficult to be effectively compressed, which increases the volume of the optical system and is not favorable for the miniaturization design of the optical system.
In one embodiment, the optical system satisfies the following conditional expression:
6.15mm≤IMGH2/TTL≤6.55mm；
the IMGH is a radius of a maximum effective imaging circle of the optical system, and the TTL is a distance on an optical axis from an object-side surface of the first lens element to an imaging surface of the optical system, that is, a total optical length of the optical system. When the condition formula is met, the total length and the half-image height of the optical system can be reasonably configured, so that the optical system can realize both miniaturization design and large image plane characteristic, and the optical system has compact structure and good imaging quality.
In one embodiment, the optical system satisfies the following conditional expression:
1.1≤TTL/IMGH≤1.3；
wherein, TTL is a distance on an optical axis from an object-side surface of the first lens element to an image plane of the optical system, that is, a total optical length of the optical system, and IMGH is a radius of a maximum effective imaging circle of the optical system, that is, a half of an image height corresponding to a maximum field angle of the optical system. When the condition formula is met, the ratio of the total optical length and the half image height of the optical system can be reasonably configured, the total optical length of the optical system is favorably shortened, the ultrathin miniaturization design is realized, and meanwhile, the optical system is favorably acquired the large image surface characteristic, so that the high imaging quality can be acquired by matching the photosensitive elements with higher pixels, and further the optical system can give consideration to the miniaturization design and the good imaging quality.
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 condition formula is met, the refractive power ratios of the second lens in the first three lenses can be reasonably configured, so that the incident light can be smoothly transited among the first three lenses of the optical system, the deflection angle of the marginal field of view light can be reduced, the refractive power burden of the deflected light of each lens (namely the fourth lens to the ninth lens) on the image side of the third lens can be reduced, the design and manufacturing sensitivity of the optical system can be reduced, the front three lenses can be prevented from generating aberration which is difficult to correct, and the imaging quality of the optical system can be improved; in addition, the reasonable configuration of the contribution amount of the negative refractive power of the second lens element is beneficial to shortening the total length of the optical system and realizing the miniaturization design, and is beneficial to preventing the surface shape of the second lens element from being excessively bent, so that the processability of the second lens element can be improved, and the molding difficulty of the second lens element can be reduced. When the refractive power of the second lens element is lower than the lower limit of the conditional expression, the refractive power of the second lens element is too strong, and the surface shape of the second lens element is excessively curved, which is not favorable for processing and molding the second lens element; exceeding the upper limit of the above conditional expressions, the negative refractive power of the second lens element is too weak to balance the positive refractive powers of the first and third lens elements, thereby inhibiting the aberration.
In one embodiment, the optical system satisfies the following conditional expression:
1.5≤|(R1+R2)/(R1-R2)|≤2；
wherein R1 is a curvature radius of an object side surface of the first lens at an optical axis, and R2 is a curvature radius of an image side surface of the first lens at the optical axis. When the above conditional expressions are satisfied, the curvature radius 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 amount of the first lens is favorably reasonably configured, the imaging quality of the visual field on the optical axis and the visual field outside the optical axis cannot be obviously degraded due to the change of the spherical aberration contribution amount, the optical performance of the optical system is improved, meanwhile, the surface type of the first lens cannot be excessively bent, and the processing and forming of the first lens are favorably realized.
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 conditional expressions are met, the proportional relation of the effective focal lengths of the first lens and the ninth lens can be reasonably configured, and the optical focal power of the optical system can be reasonably distributed, so that the chromatic aberration and the field curvature of the optical system can be corrected, the deflection angle of light rays can be reduced, and the imaging quality of the optical system can be improved.
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 condition formula is met, 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, the optical power at the rear end of the optical system is favorably and reasonably configured, the chromatic aberration and the field curvature of the optical system are favorably corrected, the negative spherical aberration generated by the eighth lens and the positive spherical aberration generated by the ninth lens are favorably counteracted with each other, and the imaging quality of the optical system is improved.
In one embodiment, the optical system satisfies the following conditional expression:
0.9≤∑ET/∑CT≤1.1；
Σ ET is a sum of distances in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of each of the first to ninth lenses, that is, a sum of edge thicknesses of each of the lenses in the optical system, where an edge thickness of a certain lens is understood to be a distance in the optical axis direction from the maximum effective aperture of the object-side surface to the maximum effective aperture of the image-side surface of the lens, and Σ CT is a sum of thicknesses in the optical axis direction of each of the first to ninth lenses, that is, a sum of center thicknesses of each of the lenses in the optical system. When the condition formula is met, the edge thickness and the center thickness of each lens can be reasonably balanced, so that the space utilization rate is favorably improved, and the processing and assembling difficulty of each lens is reduced; and, while being favorable to shortening the total length of the optical system, still be favorable to strengthening the ability that the optical system corrects the aberration to 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 the assembly difference can be caused, the assembly yield of the optical system is reduced, meanwhile, the aberration can be effectively corrected by each lens, the sensitivity of the system performance change is increased, and the improvement of the imaging quality is not facilitated; when the thickness of the edge of each lens is less than the lower limit of the conditional expression, the shape design of the lens barrel is difficult, and the advance of the assembly process is not facilitated.
In one embodiment, the optical system satisfies the following conditional expression:
1≤SD72/SD71≤1.3；
wherein SD72 is the maximum effective half aperture of the image-side surface of the seventh lens, and SD71 is the maximum effective half aperture of the object-side surface of the seventh lens. When the conditional expressions are met, the maximum effective calibers of the object side surface and the image side surface of the seventh lens can be reasonably configured, so that light rays can be smoothly transited in the seventh lens, off-axis aberration can be inhibited, and the imaging quality of the optical system can be improved; meanwhile, the radial size of the seventh lens is reduced, so that the small head design of the optical system is facilitated, the opening size 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 improved; in addition, the processability of the seventh lens is improved, the aperture of the optical system is enlarged, the light transmission quantity of the optical system is improved, and the imaging quality of the optical system is improved. When the lower limit of the conditional expression is lower than the lower limit of the conditional expression, the deflection degree of the incident light ray in the seventh lens is too large, and the off-axis aberration is easily increased, so that the imaging quality of the optical system is reduced; if the upper limit of the above conditional expression is exceeded, the radial dimension of the seventh lens is too large, which is disadvantageous for designing a small head of the optical system.
In one embodiment, the optical system satisfies the following conditional expression:
36≤f*FNO/T34≤72；
wherein FNO is an f-number of the optical system, and T34 is a distance on an optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens. When satisfying above-mentioned conditional expression, existing the overall length that is favorable to shortening optical system to satisfy the demand of miniaturized design, also be favorable to increasing optical system's light flux volume simultaneously, thereby satisfy optical system high image quality, high definition's formation of image demand. If the distance between the third lens and the fourth lens is less than the lower limit of the conditional expression, the total length of the optical system is increased, and it is difficult to satisfy the requirement for the compact design; when the upper limit of the above conditional expression is exceeded, the amount of light transmitted by the optical system is insufficient, so that the accuracy of capturing an image by the optical system is not high, which is not favorable for meeting the design requirement of high resolution imaging quality of the optical system.
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 element on the optical axis, CT2 is the thickness of the second lens element on the optical axis, and CT3 is the thickness of the third lens element on the optical axis. When the condition formula is met, the proportion of the central thickness of the third lens in the front lens group formed by the first lens and the third lens can be reasonably configured, so that the central thickness of the third lens cannot be too thick or too thin, and the processing and assembling yield of the front lens group is favorably improved.
In one embodiment, the optical system satisfies the following conditional expression:
2.5≤∑CT/(CT1+CT2+CT3)≤3；
Σ CT is the sum of the thicknesses of the respective lenses in the first to ninth lenses on the optical axis, that is, the sum of the center thicknesses of the respective lenses in 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 condition formula is met, the ratio of the sum of the central thicknesses of all the lenses to the sum of the central thicknesses of the first three lenses can be reasonably configured, so that the ratio of the central thicknesses of the first three lenses in an optical system is reasonably configured, the sum of the central thicknesses of the first three lenses cannot be too large or too small, the machining and molding of the first three lenses are facilitated, the sensitivity of the central thicknesses of the first three lenses is reduced, and the molding and assembling yield of the first three lenses is improved.
An image capturing module includes a photosensitive element and the optical system of any of the above embodiments, wherein the photosensitive element is disposed at an image side of the optical system. Adopt above-mentioned optical system among the getting for instance the module, can compromise wide angle characteristic, miniaturized design and good imaging quality's realization.
An electronic device comprises a shell and the image capturing module, wherein the image capturing module is arranged on the shell. Adopt above-mentioned module of getting for instance among the electronic equipment, can compromise wide angle characteristic, miniaturized design and good imaging quality's realization.
Drawings
FIG. 1 is a schematic structural diagram of an optical system according to a first embodiment of the present application;
FIG. 2 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a first embodiment of the present application;
FIG. 3 is a schematic structural diagram of an optical system according to a second embodiment of the present application;
FIG. 4 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a second embodiment of the present application;
FIG. 5 is a schematic view of an optical system according to a third embodiment of the present application;
FIG. 6 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a third embodiment of the present application;
FIG. 7 is a schematic structural diagram of an optical system according to a fourth embodiment of the present application;
FIG. 8 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a fourth embodiment of the present application;
FIG. 9 is a schematic structural diagram of an optical system according to a fifth embodiment of the present application;
FIG. 10 is a longitudinal spherical aberration diagram, an astigmatism diagram and a distortion diagram of an optical system in a fifth embodiment of the present application;
fig. 11 is a schematic view of an image capturing module according to an embodiment of the present application;
fig. 12 is a schematic diagram of an electronic device in an embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
It will be understood that when an element is referred to as being "secured to" 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 as used herein are for illustrative purposes only and do not denote a unique embodiment.
Referring to fig. 1, in some embodiments of the present application, an 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 L1 includes an object-side surface S1 and an image-side surface S2, the second lens L2 includes an object-side surface S3 and an image-side surface S4, the third lens L3 includes an object-side surface S5 and an image-side surface S6, the fourth lens L4 includes an object-side surface S7 and an image-side surface S8, the fifth lens L5 includes an object-side surface S9 and an image-side surface S10, the sixth lens L6 includes an object-side surface S11 and an image-side surface S12, the seventh lens L7 includes an object-side surface S13 and an image-side surface S14, the eighth lens L8 includes an object-side surface S15 and an image-side surface S16, and the ninth lens L9 includes 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 the optical axis 110 of the optical system 100. In some embodiments, the optical system 100 further includes an image plane S21 located on the image side of the ninth lens L9, and the incident light can be 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 to form an image on the image plane S21.
The first lens element L1 has positive refractive power, and the object-side surface S1 and the image-side surface S2 of the first lens element L1 are respectively convex and concave at a position near the optical axis 110, so as to converge incident light beams with large angles, thereby facilitating the reduction of the total length of the optical system 100. The second lens element L2 with negative refractive power is matched with the convex-concave shape of the second lens element L2 at a position near the optical axis 110, so as to balance the aberration generated by the first lens element L1, thereby improving the imaging quality of the optical system 100. The third lens element L3 with positive refractive power, in cooperation with the convex-concave shape of the third lens element L3 near the optical axis 110, can smoothly transmit the incident light passing through the first lens element L1 and the second lens element L2, and the positive and negative refractive power lens elements cooperate with each other to cancel out the aberration generated by each other. 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 the paraxial region 110 of the fourth lens element L4. The fifth lens element L5 with refractive power has a convex object-side surface S9 at a paraxial region 110 of the fifth lens element L5. The sixth lens element L6 has refractive power. The planar configurations of the fourth lens element L4-the seventh lens element L7 balance the refractive power burden of the front lens element (i.e., the first lens element L1-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 the generation of the aberration which is hard to correct, and at the same time, the image-side surface S8 of the fourth lens element L4 is concave at the paraxial region 110, and matches the convex configuration of the object-side surface S9 of the fifth lens element L5 at the paraxial region to facilitate the smooth transition of light. The seventh lens element L7 has refractive power. The concave-convex shape of the seventh lens element L7 near the optical axis 110 is matched with the concave-convex shape of the eighth lens element L8 near the optical axis 110, so as to reduce the deflection angle of light and reduce the risk of ghost image. The eighth lens element L8 with positive refractive power balances the negative refractive power of the ninth lens element L9, and is favorable for correcting the 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 both concave at the paraxial region 110, which is favorable for reducing the back focal length of the optical system 100, thereby reducing the total length of the optical system 100. The biconcave shape of the ninth lens L9 is favorable for enabling the marginal field of view light to be effectively incident on the imaging surface S21, so as to improve the relative brightness of the imaging surface S21, thereby 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 L9 has an inflection point, for example, both the object-side surface S17 and the image-side surface S18 of the ninth lens L9 may have an inflection point. The arrangement of the inflection points can balance the distribution of the refractive power in the vertical axis direction, thereby facilitating the correction of the aberration of the off-axis field of view and further 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 ir filter L10 may be an ir cut filter, and is used to filter out interference light, so as to prevent the interference light from reaching the imaging surface S21 of the optical system 100 and affecting normal imaging.
In some embodiments, the object-side surface and the image-side surface of each lens of optical system 100 are both aspheric. The adoption of the aspheric surface structure can improve the flexibility of lens design, effectively correct spherical aberration and improve imaging quality. In other embodiments, the object-side surface and the image-side surface of each lens of the optical system 100 may be spherical. It should be noted that the above embodiments are only examples of some embodiments of the present application, and in some embodiments, the surface of each lens in the optical system 100 may be an aspheric surface or any combination of spherical surfaces.
In some embodiments, each lens in the optical system 100 may be made of glass or plastic. The lens made of plastic material can reduce the weight and production cost of the optical system 100, and the small size of the optical system 100 is matched to achieve the light and thin design of the optical system 100. The glass lens provides the optical system 100 with excellent optical performance and high temperature resistance. It should be noted that the material of each lens in the optical system 100 may be any combination of glass and plastic, and is not necessarily both glass and plastic.
It is to 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, and the two or more lenses can form a cemented lens, and a surface of the cemented lens closest to the object side can be regarded as the object side surface S1, and a surface of the cemented lens closest to the image side can be regarded as the image side surface S2. Alternatively, although no cemented lens is formed between the lenses of the first lens L1, the distance between the lenses is relatively fixed, and in this case, 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, in some embodiments, 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 may also be greater than or equal to two, and a cemented lens may be formed between any two adjacent lenses, or a non-cemented lens may also be used.
Further, in some embodiments, the optical system 100 satisfies the conditional expression: f/tan (HFOV) is less than or equal to 6.8mm and less than or equal to 7.4 mm; wherein f is an effective focal length of the optical system, and the HFOV is half of a maximum field angle of the optical system. Specifically, 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, with numerical units in mm. When the above conditional expressions are satisfied, the effective focal length and the maximum field angle of the optical system 100 can be reasonably configured, which is beneficial to enlarging the field angle of the optical system 100 to realize a 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, also beneficial to suppressing the distortion of the optical system 100, thereby improving the imaging quality of the optical system 100, and in addition, beneficial to shortening the total length of the optical system 100 and realizing a miniaturized design. Accordingly, the optical system 100 can achieve both wide-angle characteristics, a compact design, and good image quality. When the angle of view of the optical system 100 is lower than the lower limit of the conditional expression, the distortion of the off-axis field of view is easily too large, and thus the distortion phenomenon occurs on 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 100 becomes too long, and the total length of the optical system 100 is difficult to be effectively compressed, which increases the volume of the optical system 100 and is disadvantageous for the compact design of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: IMGH of not more than 6.15mm2TTL is less than or equal to 6.55 mm; wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective image circle of the optical system 100. In particular, IMGH2the/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 expressions are satisfied, the total length and the half-image height of the optical system 100 can be reasonably configured, so that the optical system 100 can achieve both the miniaturization design and the realization of large image plane characteristics, and can have good imaging quality while having a compact structure.
In some embodiments, the optical system 100 satisfies the conditional expression: TTL/IMGH is more than or equal to 1.1 and less than or equal to 1.3; wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective image circle of the optical system 100. Specifically, TTL/IMGH can 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 expressions are satisfied, the ratio of the total optical length to the half-image height of the optical system 100 can be reasonably configured, which is beneficial to shortening the total optical length of the optical system 100, realizing ultra-thin miniaturization design, and simultaneously, being beneficial to the optical system 100 to obtain large image surface characteristics, so that the optical system 100 can be matched with the photosensitive elements with higher pixels to obtain high imaging quality, and further, the optical system 100 can give consideration to miniaturization 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 plane S21 of the optical system 100 has a horizontal direction and a diagonal direction, and the maximum angle of view of the optical system 100 can be understood as the maximum angle of view of the optical system 100 in the diagonal direction, and IMGH can be understood as half the length of the effective pixel area on the imaging plane S21 of the optical system 100 in the diagonal direction.
In some embodiments, the optical system 100 satisfies the conditional expression: | f2/f123| is more than or equal to 0.5 and less than or equal to 2.5; where 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 expressions are satisfied, the refractive power ratios of the second lens element L2 in the first three lens elements can be reasonably configured, which is favorable for smooth transition of incident light rays between the first three lens elements of the optical system 100, thereby being favorable for reducing the deflection angle of marginal field light rays, reducing the refractive power burden of deflected light rays of the third lens element L3 image side lens elements (i.e., the fourth lens element L4 to the ninth lens element L9), further being favorable for reducing the design and manufacturing sensitivity of the optical system 100, and simultaneously being favorable for avoiding the first three lens elements from generating aberration which is difficult to correct, thereby being favorable for improving the imaging quality of the optical system 100; furthermore, the rational arrangement of the amount of contribution of the negative refractive power of the second lens element L2 is also advantageous in that the total length of the optical system 100 can be shortened to achieve a compact design, and in that the surface shape of the second lens element L2 is not excessively curved, so that the workability of the second lens element L2 can be improved, and the difficulty in molding the second lens element L2 can be reduced. Below the lower limit of the 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 too curved, which is not favorable for the processing and molding of the second lens element L2; above the upper limit of the conditional expression, the negative refractive power of the second lens element L2 is too weak to balance the positive refractive powers of the first lens element L1 and the third lens element L3, thereby inhibiting aberrations.
In some embodiments, the optical system 100 satisfies the conditional expression: 1.5 ≦ (R1+ R2)/(R1-R2) | ≦ 2; wherein R1 is the radius of curvature of the object-side surface S1 of the first lens element L1 on the optical axis 110, and R2 is the radius of curvature of the image-side surface S2 of the first lens element L1 on 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 expressions are satisfied, the curvature radii 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 not only beneficial to reasonably configuring the spherical aberration contribution amount 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 is not obviously degraded due to the change of the spherical aberration contribution amount, thereby improving the optical performance of the optical system 100, but also beneficial to not excessively bending the surface shape of the first lens L1, thereby being beneficial to the processing and molding of the first lens L1.
In some embodiments, the optical system 100 satisfies the conditional expression: | f1/f9| is more than or equal to 1.8 and less than or equal to 2.2; wherein f1 is the effective focal length of the first lens, and f9 is the 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 expressions are satisfied, the proportional relationship between the effective focal lengths of the first lens L1 and the ninth lens L9 can be configured reasonably, which is beneficial to reasonably distributing the focal power of the optical system 100, so as to be beneficial to correcting the chromatic aberration and curvature of field of the optical system 100, and reducing the deflection angle of light, thereby being beneficial to improving the imaging quality of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: | f8/f9| is more than or equal to 1.5 and less than or equal to 4; where 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 conditional expressions are satisfied, the ratio of the effective focal lengths of the eighth lens L8 and the ninth lens L9 of the imaging surface S21 close to the rear end can be reasonably configured, which is beneficial to reasonably configuring the focal power of the rear end of the optical system 100, so as to be beneficial to correcting chromatic aberration and curvature of field of the optical system 100, and in addition, the negative spherical aberration generated by the eighth lens L8 and the positive spherical aberration generated by the ninth lens L9 are beneficial to offsetting each other, so as to improve the imaging quality of the optical system 100.
In some embodiments, the optical system 100 satisfies the conditional expression: e, ET/CT is more than or equal to 0.9 and less than or equal to 1.1; Σ ET is a sum of distances in the optical axis direction from the maximum effective aperture on the object side to the maximum effective aperture on the image side of each of the first to ninth lenses, and Σ CT is a sum of thicknesses in the optical axis of each of the first to ninth lenses. Specifically, Σ ET/Σ CT 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 condition formula is met, the edge thickness and the center thickness of each lens can be reasonably balanced, so that the space utilization rate is favorably improved, and the processing and assembling difficulty of each lens is reduced; moreover, the total length of the optical system 100 is advantageously shortened, and the capability of the optical system 100 for correcting aberration is also advantageously enhanced, so that the miniaturization design and the high imaging quality are both considered. When the upper limit of the above conditional expression is exceeded, the thickness of the edge of each lens is too large, which may cause assembly difference, thereby reducing the assembly yield of the optical system 100, and simultaneously not facilitating effective correction of aberration by each lens, increasing sensitivity of system performance change, and thereby not facilitating improvement of imaging quality; when the thickness of the edge of each lens is less than the lower limit of the conditional expression, the shape design of the lens barrel is difficult, and the advance 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-diameter of the image-side surface S14 of the seventh lens L7, and SD71 is the maximum effective half-diameter 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 conditional expressions are satisfied, the maximum effective apertures of the object side surface S13 and the image side surface S14 of the seventh lens L7 can be reasonably configured, which is beneficial to the smooth transition of light rays in the seventh lens L7, so that the generation of off-axis aberration is inhibited, and the imaging quality of the optical system 100 is further improved; meanwhile, the radial size of the seventh lens L7 is reduced, which is beneficial to the small head design of the optical system 100, so that when the optical system 100 is applied to an electronic device, the size of the opening of the optical system 100 on the screen of the electronic device can be reduced, and the screen occupation ratio of the electronic device is improved; in addition, it is also advantageous to improve the workability of the seventh lens L7 and to enlarge the aperture of the optical system 100, thereby improving the light flux of the optical system 100 and further improving the imaging quality of the optical system 100. 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, which tends to increase the off-axis aberration, thereby degrading the 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 becomes 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 not less than 36 and not more than 72 of FNO/T34; wherein FNO is an f-number of the optical system 100, and T34 is a distance from the image-side surface S6 of the third lens L3 to the object-side surface S7 of the fourth lens 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 expressions are satisfied, it is advantageous to shorten the total length of the optical system 100 to satisfy the demand of miniaturization design, and it is also advantageous to increase the light transmission amount of the optical system 100 to satisfy the imaging demand of high image quality and high definition of the optical system 100. If the distance between the third lens L3 and the fourth lens L4 is too large below the lower limit of the above conditional expression, the total length of the optical system 100 increases, and it is difficult to meet the demand for compact design; if the upper limit of the above conditional expression is exceeded, the amount of light transmitted by the optical system 100 is insufficient, and the accuracy of capturing an image by the optical system 100 is not high, which is not favorable for satisfying the design requirement of the optical system 100 for high-resolution imaging quality.
In some embodiments, the optical system 100 satisfies the conditional expression: 0.4-0.5 percent of CT3/(CT1+ CT2+ CT 3); wherein 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, CT3/(CT1+ CT2+ CT3) 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 expressions are satisfied, the ratio of the center thickness of the third lens L3 in the front lens group composed of 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, and the processing and assembly yield of the front lens group is favorably improved.
In some embodiments, the optical system 100 satisfies the conditional expression: sigma CT/(CT1+ CT2+ CT3) is not less than 2.5 and not more than 3; Σ CT is the sum of the thicknesses of the lenses on the optical axis 110 of the first lens L1 to the ninth lens L9, 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, Σ CT/(CT1+ CT2+ CT3) 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 condition formula is met, the ratio of the sum of the central thicknesses of all the lenses to the sum of the central thicknesses of the front three lenses can be reasonably configured, so that the proportion of the central thicknesses of the front three lenses in the optical system 100 is reasonably configured, the sum of the central thicknesses of the front three lenses cannot be too large or too small, the machining and molding of the front three lenses are facilitated, meanwhile, the central thickness sensitivity of the front three lenses is reduced, and the molding and assembling yield of the front three lenses is improved.
The reference wavelengths of the effective focal length and the combined focal length values are 555 nm.
Based on the above description of the embodiments, more specific embodiments and drawings are set forth below for detailed description.
First embodiment
Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of the optical system 100 in the first embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with negative refractive power, an eighth lens element L8 with positive refractive power, and a ninth lens element 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, sequentially from left to right, wherein the reference wavelength of the astigmatism graph and the distortion graph is 555nm, and the 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 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 object-side surface S7 of the fourth lens element L4 is concave at the paraxial region 110, and the image-side surface S8 is concave 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 object-side surface S13 of the seventh lens element L7 is concave at the paraxial region 110, and the image-side surface S14 is convex at the paraxial region 110;
the object-side surface S15 of the eighth lens element L8 is convex at the paraxial region 110, and the image-side surface S16 is concave 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 surface and the image-side surface 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 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) 6.854 mm; wherein f is an effective focal length of the optical system, and the HFOV is a half of a maximum field angle of the optical system. When the above conditional expressions are satisfied, the effective focal length and the maximum field angle of the optical system 100 can be reasonably configured, which is beneficial to expanding the field angle of the optical system 100 to realize a 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 beneficial to suppressing the distortion of the optical system 100, thereby improving the imaging quality of the optical system 100, and in addition, being beneficial to shortening the total length of the optical system 100 and realizing a 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: IMGH26.541mm for TTL; wherein, TTL is a distance from the object-side surface S1 of the first lens element L1 to the image plane S21 of the optical system 100 on the optical axis 110, and IMGH is a radius of a maximum effective image circle of the optical system 100. When the above conditional expressions are 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 miniaturization design and large image plane characteristic, and can have good imaging quality while having a compact structureAmount of the compound (A).
The optical system 100 satisfies the conditional expression: TTL/IMGH is 1.166; wherein, TTL is a distance from the object side surface S1 of the first lens element L1 to the image plane 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 expressions are satisfied, the ratio of the total optical length to the half-image height of the optical system 100 can be reasonably configured, which is beneficial to shortening the total optical length of the optical system 100, realizing ultra-thin miniaturization design, and simultaneously, being beneficial to the optical system 100 to obtain large image surface characteristics, so that the optical system 100 can be matched with the photosensitive elements with higher pixels to obtain high imaging quality, and further, the optical system 100 can give consideration to miniaturization design and good imaging quality.
The optical system 100 satisfies the conditional expression: 2.105 | f2/f123 |; where 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 expressions are satisfied, the refractive power ratios of the second lens element L2 in the first three lens elements can be reasonably configured, which is favorable for smooth transition of incident light rays between the first three lens elements of the optical system 100, thereby being favorable for reducing the deflection angle of marginal field light rays, reducing the refractive power burden of deflected light rays of the third lens element L3 image side lens elements (i.e., the fourth lens element L4 to the ninth lens element L9), further being favorable for reducing the design and manufacturing sensitivity of the optical system 100, and simultaneously being favorable for avoiding the first three lens elements from generating aberration which is difficult to correct, thereby being favorable for improving the imaging quality of the optical system 100; moreover, the rational arrangement of the amount of contribution of the negative refractive power of the second lens element L2 is also advantageous in that the total length of the optical system 100 can be shortened and the optical system can be downsized, and in that the surface shape of the second lens element L2 is not excessively curved, so that the workability of the second lens element L2 can be improved and the difficulty in molding 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 the radius of curvature of the object-side surface S1 of the first lens element L1 on the optical axis 110, and R2 is the radius of curvature of the image-side surface S2 of the first lens element L1 on the optical axis 110. When the above conditional expressions are satisfied, the curvature radii 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 not only beneficial to reasonably configuring the spherical aberration contribution amount 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 is not obviously degraded due to the change of the spherical aberration contribution amount, thereby improving the optical performance of the optical system 100, but also beneficial to not excessively bending the surface shape of the first lens L1, thereby being beneficial to the processing and molding of the first lens L1.
The optical system 100 satisfies the conditional expression: 2.125 | f1/f9 |; wherein f1 is the effective focal length of the first lens, and f9 is the effective focal length of the ninth lens. When the above conditional expressions are satisfied, the proportional relationship between the effective focal lengths of the first lens L1 and the ninth lens L9 can be configured reasonably, which is favorable for reasonably distributing the focal power of the optical system 100, so that the chromatic aberration and the curvature of field of the optical system 100 are favorably corrected, the deflection angle of light is reduced, and the imaging quality of the optical system 100 is favorably improved.
The optical system 100 satisfies the conditional expression: 1.791 | f8/f9 |; where 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 conditional expressions are satisfied, the ratio of the effective focal lengths of the eighth lens L8 and the ninth lens L9 of the imaging surface S21 close to the rear end can be reasonably configured, which is beneficial to reasonably configuring the focal power of the rear end of the optical system 100, so as to be beneficial to correcting chromatic aberration and curvature of field of the optical system 100, and in addition, the negative spherical aberration generated by the eighth lens L8 and the positive spherical aberration generated by the ninth lens L9 are beneficial to offsetting each other, so as to improve the imaging quality of the optical system 100.
The optical system 100 satisfies the conditional expression: Σ ET/Σ CT is 1.065; Σ ET is a sum of distances in the optical axis direction from the maximum effective aperture on the object side to the maximum effective aperture on the image side of each of the first to ninth lenses, and Σ CT is a sum of thicknesses in the optical axis of each of the first to ninth lenses. When the condition formula is met, the edge thickness and the center thickness of each lens can be reasonably balanced, so that the space utilization rate is favorably improved, and the processing and assembling difficulty of each lens is reduced; moreover, the total length of the optical system 100 is advantageously shortened, and the capability of the optical system 100 for correcting aberration is also advantageously enhanced, so that the miniaturization design and the high imaging quality are both considered.
The optical system 100 satisfies the conditional expression: SD72/SD71 is 1.131; here, SD72 is the maximum effective half-diameter of the image-side surface S14 of the seventh lens L7, and SD71 is the maximum effective half-diameter of the object-side surface S13 of the seventh lens L7. When the above conditional expressions are satisfied, the maximum effective apertures 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 the light to smoothly transition in the seventh lens L7, thereby being favorable for suppressing the off-axis aberration, and further improving the imaging quality of the optical system 100; meanwhile, the radial size of the seventh lens L7 is reduced, which is beneficial to the small head design of the optical system 100, so that when the optical system 100 is applied to an electronic device, the size of the opening of the optical system 100 on the screen of the electronic device can be reduced, and the screen occupation ratio of the electronic device is improved; in addition, the workability of the seventh lens L7 is improved, and the aperture of the optical system 100 is enlarged, so that the light transmission amount of the optical system 100 is improved, and the imaging quality of the optical system 100 is improved.
The optical system 100 satisfies the conditional expression: f × FNO/T34 ═ 36.687; wherein FNO is an f-number of the optical system 100, and T34 is a distance from the image-side surface S6 of the third lens L3 to the object-side surface S7 of the fourth lens L4 on the optical axis 110. When the above conditional expressions are satisfied, it is advantageous to shorten the total length of the optical system 100 to satisfy the requirement of miniaturization design, and it is also advantageous to increase the light flux amount of the optical system 100 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: CT3/(CT1+ CT2+ CT3) ═ 2.887; wherein 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 expressions are satisfied, the ratio of the center thickness of the third lens L3 in the front lens group composed of 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, and the processing and assembly yield of the front lens group is favorably improved.
The optical system 100 satisfies the conditional expression: Σ CT/(CT1+ CT2+ CT3) ═ 2.887; Σ CT is the sum of the thicknesses of the lenses of the first lens L1 to the ninth lens L9 on the optical axis 110, 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 condition formula is met, the ratio of the sum of the central thicknesses of all the lenses to the sum of the central thicknesses of the front three lenses can be reasonably configured, so that the proportion of the central thicknesses of the front three lenses in the optical system 100 is reasonably configured, the sum of the central thicknesses of the front three lenses cannot be too large or too small, the machining and molding of the front three lenses are facilitated, meanwhile, the central thickness sensitivity of the front three lenses is reduced, and the molding and assembling yield of the front three lenses is improved.
In addition, the parameters of the optical system 100 are given in table 1. In which elements from the object plane (not shown) to the image plane S21 are sequentially arranged in the order of elements from top to bottom of table 1. The Y radius in table 1 is the radius of curvature of the object-side or image-side surface at the optical axis 110 for the corresponding surface number. Surface numbers S1 and S2 denote an object-side surface S1 and an image-side surface S2 of the first lens L1, respectively, that is, in the same lens, a surface with a smaller surface number is an object-side surface, and a surface with a larger surface number is an image-side surface. The first numerical value in the "thickness" parameter column of the first lens element L1 is the thickness of the lens element along the optical axis 110, and the second numerical value is the distance between the image-side surface and the rear surface of the lens element along the image-side direction along the optical axis 110.
It should be noted 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 of the ninth lens L9 to the image plane S21 is kept unchanged.
In the first embodiment, the effective focal length f of the optical system 100 is 7.050mm, the total optical length TTL is 8.9mm, half of the maximum field angle HFOV is 45.810deg, and the f-number FNO is 2.265. As is apparent from table 1 and fig. 2, the optical system 100 has a wide-angle characteristic, can satisfy the requirement of image capture in a wide range, can satisfy the requirement of miniaturization design, and has a large image plane characteristic, so that it can match with a photosensitive element having a higher pixel to obtain a good image quality.
The reference wavelength of the focal length of each lens is 555nm, and the reference wavelengths of the refractive index and the Abbe number are 587.56nm, and the same is also realized in other embodiments.
TABLE 1
Figure BDA0003524950800000111
Figure BDA0003524950800000121
Further, aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are given by table 2. The surface numbers S1-S18 represent the image side or the object side S1-S18, respectively. And K-a20 from top to bottom respectively represent types of aspheric coefficients, where K represents a conic coefficient, a4 represents a quartic aspheric coefficient, a6 represents a sextic aspheric coefficient, A8 represents an octal aspheric coefficient, and so on. In addition, the aspherical surface coefficient formula is as follows:
Figure BDA0003524950800000122
wherein Z is the distance from the corresponding point on the aspheric surface to the plane tangent 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 surface vertex, K is the conic coefficient, and Ai is the coefficient corresponding to the i-th high-order term in the aspheric surface type formula.
TABLE 2
Figure BDA0003524950800000123
Figure BDA0003524950800000131
In addition, fig. 2 includes a Longitudinal Spherical Aberration diagram (Longitudinal Spherical Aberration) of the optical system 100, in which the Longitudinal Spherical Aberration curve represents the convergent focus deviation of light rays of different wavelengths after passing through the lens, wherein the ordinate represents 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 image plane S21 to the intersection of the light rays and the optical axis 110. It can be known from the longitudinal spherical aberration diagram that the convergent focus deviation degrees of the light rays with different wavelengths in the first embodiment tend to be consistent, and the diffuse speckles or color halos in the imaging picture are effectively inhibited. Fig. 2 also includes an astigmatism graph (ASTIGMATIC FIELD CURVES) of the optical system 100, in which the abscissa represents the focus offset and the ordinate represents the image height in mm, and the S-curve and the T-curve in the astigmatism graph represent sagittal curvature at 555nm and meridional curvature at 555nm, respectively. As can be seen from the figure, the curvature of field of the optical system 100 is small, the curvature of field and astigmatism of each field are well corrected, and the center and the edge of the field have clear images. Fig. 2 further includes a DISTORTION plot (distorrion) of the optical system 100, where the DISTORTION plot represents DISTORTION magnitude values corresponding to different angles of view, where the abscissa represents DISTORTION value in mm 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 the optical system 100 in the second embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with negative refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with positive refractive power, an eighth lens element L8 with positive refractive power, and a ninth lens element L9 with negative refractive power. Fig. 4 is a graph of longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the second embodiment, which is shown 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 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 object-side surface S7 of the fourth lens element L4 is concave at the paraxial region 110, and the image-side surface S8 is concave 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 object-side surface S13 of the seventh lens element L7 is concave at the paraxial region 110, and the image-side surface S14 is convex at the paraxial region 110;
the object-side surface S15 of the eighth lens element L8 is convex at the paraxial region 110, and the image-side surface S16 is concave 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 surface and the image-side surface 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 aspheric.
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 made of plastic.
In addition, the parameters of the optical system 100 are given in table 3, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.
TABLE 3
Figure BDA0003524950800000132
Figure BDA0003524950800000141
Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 4, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.
TABLE 4
Figure BDA0003524950800000142
Figure BDA0003524950800000151
According to the 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 IMGH2/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 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 the optical system 100 in the third embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with negative refractive power, a seventh lens element L7 with negative refractive power, an eighth lens element L8 with positive refractive power, and a ninth lens element L9 with negative refractive power. Fig. 6 is a graph showing the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the third embodiment 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 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 object-side surface S7 of the fourth lens element L4 is convex at the paraxial region 110, and the image-side surface S8 is concave 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 object-side surface S13 of the seventh lens element L7 is concave at the paraxial region 110, and the image-side surface S14 is convex at the paraxial region 110;
the object-side surface S15 of the eighth lens element L8 is convex at the paraxial region 110, and the image-side surface S16 is concave 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 surface and the image-side surface 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 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 definitions of the parameters can be derived from the first embodiment, which is not repeated herein.
TABLE 5
Figure BDA0003524950800000152
Figure BDA0003524950800000161
Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 6, and the definitions of the parameters can be derived from the first embodiment, which is not repeated herein.
TABLE 6
Figure BDA0003524950800000162
Figure BDA0003524950800000171
And, according to the above provided parameter information, the following data can be derived:
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 IMGH2/TTL(mm) 6.178
|f1/f9| 1.901 CT3/(CT1+CT2+CT3) 2.863
in addition, as can be seen from the aberration diagram in fig. 6, the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 are 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 the optical system 100 in the fourth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with negative refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, an eighth lens element L8 with positive refractive power, and a ninth lens element L9 with negative refractive power. Fig. 8 is a graph of longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the fourth embodiment, which is shown 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 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 object-side surface S7 of the fourth lens element L4 is convex at the paraxial region 110, and the image-side surface S8 is concave 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 object-side surface S13 of the seventh lens element L7 is concave at the paraxial region 110, and the image-side surface S14 is convex at the paraxial region 110;
the object-side surface S15 of the eighth lens element L8 is convex at the paraxial region 110, and the image-side surface S16 is concave 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 surface and the image-side surface 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 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 definitions of the parameters can be obtained from the first embodiment, which is not described herein.
TABLE 7
Figure BDA0003524950800000181
Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 8, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.
TABLE 8
Figure BDA0003524950800000182
Figure BDA0003524950800000191
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 IMGH2/TTL(mm) 1.205
|f1/f9| 2.082 CT3/(CT1+CT2+CT3) 0.477
in addition, as can be seen from the aberration diagram in fig. 8, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are 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 the optical system 100 in the fifth embodiment, in which the optical system 100 includes, in order from an object side to an image side, a stop STO, a first lens element L1 with positive refractive power, a second lens element L2 with negative refractive power, a third lens element L3 with positive refractive power, a fourth lens element L4 with positive refractive power, a fifth lens element L5 with positive refractive power, a sixth lens element L6 with positive refractive power, a seventh lens element L7 with negative refractive power, an eighth lens element L8 with positive refractive power, and a ninth lens element L9 with negative refractive power. Fig. 10 is a graph showing the longitudinal spherical aberration, astigmatism and distortion of the optical system 100 in the fifth embodiment 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 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 object-side surface S7 of the fourth lens element L4 is convex at the paraxial region 110, and the image-side surface S8 is concave 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 object-side surface S13 of the seventh lens element L7 is concave at the paraxial region 110, and the image-side surface S14 is convex at the paraxial region 110;
the object-side surface S15 of the eighth lens element L8 is convex at the paraxial region 110, and the image-side surface S16 is concave 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 surface and the image-side surface 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 aspheric.
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 made of plastic.
In addition, the parameters of the optical system 100 are given in table 9, and the definitions of the parameters can be obtained from the first embodiment, which is not described herein.
TABLE 9
Figure BDA0003524950800000201
Further, the aspheric coefficients of the image-side surface or the object-side surface of each lens of the optical system 100 are shown in table 10, and the definitions of the parameters can be obtained from the first embodiment, which is not repeated herein.
Watch 10
Figure BDA0003524950800000202
Figure BDA0003524950800000211
And, according to the above provided parameter information, the following data can be derived:
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 IMGH2/TTL(mm) 6.369
|f1/f9| 2.133 CT3/(CT1+CT2+CT3) 2.771
in addition, as can be seen from the aberration diagram in fig. 10, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 100 are 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 light-sensing surface of the light-sensing element 210 can be regarded as the image-forming surface S21 of the optical system 100. The image capturing module 200 may further include an infrared filter L10, and the infrared filter L10 is disposed between the image side surface S18 and the image plane S21 of the ninth lens element L9. Specifically, the photosensitive element 210 may be a Charge Coupled Device (CCD) or a Complementary Metal-Oxide Semiconductor (CMOS) Device. The optical system 100 is adopted in the image capturing module 200, which can achieve wide-angle characteristics, miniaturized 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, the electronic device 300 includes a housing 310, and the image capturing module 200 is disposed in the housing 310. Specifically, the electronic apparatus 300 may be, but is not limited to, a wearable device such as a mobile phone, a video phone, a smart phone, an electronic book reader, a vehicle-mounted image capturing apparatus such as a car recorder, or a smart watch. When the electronic device 300 is a smartphone, the housing 310 may be a middle frame of the electronic device 300. The image capturing module 200 is adopted in the electronic device 300, so that the wide-angle characteristic, the miniaturization design and the realization of good imaging quality can be considered at the same time.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (11)

1. 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 and a concave image-side surface;
a third lens element with positive refractive power having a convex object-side surface and a concave image-side surface;
a fourth lens element with refractive power having a concave image-side surface at paraxial region;
a fifth lens element with refractive power having a convex object-side surface at 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；
wherein f is an effective focal length of the optical system, and the HFOV is half of a maximum field angle of the optical system.
2. The optical system according to claim 1, wherein the following conditional expression is satisfied:
6.15mm≤IMGH2/TTL≤6.55mm；
the IMGH is a radius of a maximum effective imaging circle of the optical system, and the TTL is a distance from an object-side surface of the first lens element to an imaging surface of the optical system on an 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 curvature radius of an object side surface of the first lens at an optical axis, and R2 is a curvature radius of an image side surface of the first lens at the optical axis.
5. The optical system according to claim 1, wherein the following conditional expression is satisfied:
1.8≤|f1/f9|≤2.2；
wherein f1 is the effective focal length of the first lens, and f9 is the effective focal length of the ninth lens.
6. The optical system according to claim 1, wherein the following conditional expression is satisfied:
0.9≤∑ET/∑CT≤1.1；
Σ ET is a sum of distances in the optical axis direction from the maximum effective aperture on the object side to the maximum effective aperture on the image side of each of the first to ninth lenses, and Σ CT is a sum of thicknesses in the optical axis of each of the first to ninth lenses.
7. The optical system according to claim 1, wherein the following conditional expression is satisfied:
1≤SD72/SD71≤1.3；
wherein SD72 is the maximum effective half aperture of the image-side surface of the seventh lens, and SD71 is the maximum effective half aperture of the object-side surface of the seventh lens.
8. The optical system according to claim 1, wherein the following conditional expression is satisfied:
36≤f*FNO/T34≤72；
wherein FNO is an f-number of the optical system, and T34 is a distance on an optical axis from an image-side surface of the third lens to an object-side surface of the fourth lens.
9. The optical system according to claim 1, characterized in that the following conditional expression is satisfied:
0.4≤CT3/(CT1+CT2+CT3)≤0.5；
wherein CT1 is the thickness of the first lens element on the optical axis, CT2 is the thickness of the second lens element on the optical axis, and CT3 is the thickness of the third lens element on the optical axis.
10. An image capturing module, comprising a photosensitive element and the optical system of any one of claims 1 to 9, wherein the photosensitive element is disposed on an image side of the optical system.
11. An electronic device, comprising a housing and the image capturing module of claim 10, wherein the image capturing module is disposed on the housing.
CN202210192779.6A 2022-02-28 2022-02-28 Optical system, image capturing module and electronic equipment Active CN114740591B (en)

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JP2012083789A (en) * 2012-01-30 2012-04-26 Olympus Corp Microscope objective lens
US20200209593A1 (en) * 2018-12-29 2020-07-02 Kantatsu Co., Ltd. Imaging lens
CN111812816A (en) * 2020-09-08 2020-10-23 常州市瑞泰光电有限公司 Image pickup optical lens
CN113484984A (en) * 2021-06-21 2021-10-08 江西晶超光学有限公司 Optical lens, camera module and electronic equipment
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2012083789A (en) * 2012-01-30 2012-04-26 Olympus Corp Microscope objective lens
US20200209593A1 (en) * 2018-12-29 2020-07-02 Kantatsu Co., Ltd. Imaging lens
CN111812816A (en) * 2020-09-08 2020-10-23 常州市瑞泰光电有限公司 Image pickup optical lens
CN113484984A (en) * 2021-06-21 2021-10-08 江西晶超光学有限公司 Optical lens, camera module and electronic equipment
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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