CN111736319B - Optical lens and imaging apparatus - Google Patents
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- CN111736319B CN111736319B CN202010866914.1A CN202010866914A CN111736319B CN 111736319 B CN111736319 B CN 111736319B CN 202010866914 A CN202010866914 A CN 202010866914A CN 111736319 B CN111736319 B CN 111736319B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 171
- 238000003384 imaging method Methods 0.000 title claims abstract description 25
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- 238000005286 illumination Methods 0.000 description 9
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- 239000000463 material Substances 0.000 description 6
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- 238000003331 infrared imaging Methods 0.000 description 3
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—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 three lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
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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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in turn: the device comprises a first lens, a diaphragm, a second lens, a third lens and an optical filter; the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface or a convex surface; the second lens has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens element has negative focal power, a convex object-side surface, a concave image-side surface at the paraxial region, and at least one inflection point on the image-side surface; the first lens, the second lens and the third lens are plastic aspheric lenses. The optical lens provided by the invention has the characteristics of wide visual angle, large aperture, small distortion and high imaging quality, and is more suitable for the design requirement of the DToF technology.
Description
Technical Field
The present invention relates to the field of lens imaging technologies, and in particular, to an optical lens and an imaging device.
Background
In recent years, a three-dimensional depth recognition technology is rapidly developed, and meanwhile, a ToF (Time of Flight) stereoscopic depth-sensing lens with a three-dimensional space sensing capability opens a new future of depth information and is widely concerned and applied in the smart phone industry. The ToF technology can be divided into a DToF technology and an IToF technology according to a ranging principle, the DToF technology (direct Time-of-Flight) is used for directly measuring Flight Time, and the DToF technology has higher precision, shorter ranging Time, strong anti-interference capability and relatively simple calibration compared with the IToF technology.
With the introduction of a new iPad Pro series tablet personal computer adopting a DToF technology as a receiving-end lens by apple, the DToF lens has an increasing demand in devices such as face recognition, stereo imaging, somatosensory interaction and the like.
On one hand, due to the trend of ultra-high definition, light weight, thinness, shortness and smallness of electronic products, users require that the DToF lens configured on the electronic products has the characteristics of high resolution and small volume; on the other hand, the DToF technology has the most marked function of measuring data information such as depth of field, so the DToF lens is required to have the characteristics of wide viewing angle, large aperture, infrared imaging and the like so as to meet the requirement of accurate measurement of distance information. However, the existing optical lens applied to the smart phone cannot meet these requirements at the same time.
Disclosure of Invention
To this end, an object of the present invention is to provide an optical lens and an imaging apparatus for solving the above problems.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane: the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface or a convex surface; a diaphragm; the second lens with positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens element having a negative optical power, the third lens element having a convex object-side surface and a concave image-side surface at a paraxial region and having at least one inflection point; and a filter. The first lens, the second lens and the third lens are plastic aspheric lenses; the optical lens satisfies the following conditional expression: 1.55< f/EPD < 1.65; where f denotes a focal length of the optical lens, and EPD denotes an entrance pupil diameter of the optical lens.
In a second aspect, the present invention provides an imaging apparatus, comprising an imaging element and the optical lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical lens into an electrical signal.
Compared with the prior art, the optical lens provided by the invention has the characteristics of wide visual angle, large aperture, high infrared imaging quality and the like while meeting the high-quality resolving power through the reasonable arrangement of the diaphragm and each lens, and can better meet the imaging requirement of the imaging equipment adopting the DToF technology.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural diagram of an optical lens system according to a first embodiment of the present invention;
FIG. 2 is a field curvature graph of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing optical distortion of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph illustrating relative illumination of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;
FIG. 6 is a field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a graph showing optical distortion of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph illustrating relative illumination of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;
FIG. 10 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
fig. 11 is a graph showing an optical distortion of an optical lens in a third embodiment of the present invention;
FIG. 12 is a graph illustrating relative illuminance of an optical lens according to a third embodiment of the present invention;
fig. 13 is a schematic structural view of an image forming apparatus in a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The invention provides an optical lens, comprising the following components in sequence from an object side to an imaging surface: a first lens having a positive optical power; a diaphragm; a second lens having a positive optical power; a third lens having a negative optical power; and (3) a filter. The object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface or a convex surface; the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the object side surface of the third lens is convex, and the image side surface of the third lens is concave at a paraxial region and is provided with at least one inflection point; the first lens, the second lens and the third lens are plastic aspheric lenses. The diaphragm is arranged between the first lens and the second lens, so that the tolerance of the whole lens is good, and the improvement of the product yield is facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
1.55<f/EPD<1.65；（1）
where f denotes a focal length of the optical lens, and EPD denotes an entrance pupil diameter of the optical lens. The optical lens has a large aperture, the light transmission amount of the optical lens can be reasonably controlled, the aberration of the optical lens is favorably reduced, and the resolving power of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.0<n1<1.55；（2）
1.0<n2<1.55；（3）
1.0<n3<1.66；（4）
0.9 <V1/V2<1.1；（5）
where n1 denotes a refractive index of the first lens, n2 denotes a refractive index of the second lens, n3 denotes a refractive index of the third lens, V1 denotes an abbe number of the first lens, and V2 denotes an abbe number of the second lens. The lens meets the conditional expressions (2) to (5), and the lens meets high-quality resolution and is beneficial to reducing the production cost through reasonable collocation of the three plastic lenses.
In some embodiments, the optical lens satisfies the following conditional expression:
3.3mm<(TTL/IH)×f<3.5mm；（6）
wherein, TTL represents the total optical length of the optical lens, IH represents the maximum image height of the optical lens on the image plane, and f represents the focal length of the optical lens. Satisfying the conditional expression (6), the focal length and the total optical length of the optical lens can be reasonably controlled, and the total optical length of the optical lens can be shortened.
In some embodiments, the optical lens satisfies the following conditional expression:
0.21mm-1<tan2 (FOV/2) /DM1<0.23mm-1；（7）
0.2<CT1/DM1<0.3；（8）
where FOV denotes the maximum angle of view of the optical lens, DM1 denotes the effective diameter of the first lens, and CT1 denotes the center thickness of the first lens. Satisfying conditional expressions (7) and (8) is beneficial to realizing the small and large aperture of the head size of the optical lens while ensuring the increase of the field angle of the side of the object, reducing the windowing area of the screen, being beneficial to realizing the miniaturization of the head of the lens and improving the screen occupation ratio of the portable electronic product.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.2<f3/f<-1.0；（9）
where f3 denotes a focal length of the third lens, and f denotes a focal length of the optical lens. And the conditional expression (9) is satisfied, so that the third lens has larger negative focal power, light rays can be better contracted, the volume of the optical lens is favorably reduced, and meanwhile, the field curvature and the distortion are favorably corrected.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<(f1+f2+f3)/f<1.1；（10）
-1.3<f1/f3<-1.1；（11）
where f denotes a focal length of the optical lens, f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f3 denotes a focal length of the third lens. Satisfying conditional expressions (10) and (11), the focal power of each lens can be reasonably distributed, which is beneficial to correcting spherical aberration and reducing the correction difficulty of high-grade aberration, so that the optical lens has high-quality resolving power.
In some embodiments, the optical lens satisfies the following conditional expression:
0.7<|θ6/θC|<2.3；（12）
wherein, theta6Denotes the maximum surface inclination angle theta of the image side surface of the third lensCRepresenting the maximum chief ray angle of incidence of the optical lens. The condition formula (12) is satisfied, the chief ray incident angle of the optical lens can be reasonably controlled, the matching degree of the optical lens and the image sensor is favorably improved, and the resolution quality of the optical lens is improved. Meanwhile, the aberration correction difficulty of a large view field angle can be reduced, and the improvement of the relative illumination of the peripheral view field is facilitated.
In some embodiments, the optical lens satisfies the following conditional expression:
3<R2/DM1<23；（13）
5.2<R5/DM3<5.3；（14）
where R2 denotes a radius of curvature of an image-side surface of the first lens, R5 denotes a radius of curvature of an object-side surface of the third lens, DM1 denotes an effective diameter of the first lens, and DM3 denotes an effective diameter of the third lens. The conditional expressions (13) and (14) are satisfied, the incident angle of the light rays entering the optical lens can be reasonably controlled, and the difficulty of optical distortion correction is favorably reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.5<(R1+R2)/(R1-R2)<-1；（15）
3.3<(R3+R4)/(R3-R4)<3.9；（16）
1.1<(R5+R6)/(R5-R6)<2.1；（17）
where R1 denotes a radius of curvature of the object-side surface of the first lens, R2 denotes a radius of curvature of the image-side surface of the first lens, R3 denotes a radius of curvature of the object-side surface of the second lens, R4 denotes a radius of curvature of the image-side surface of the second lens, R5 denotes a radius of curvature of the object-side surface of the third lens, and R6 denotes a radius of curvature of the image-side surface of the third lens. The optical lens meets the conditional expressions (15), (16) and (17), can reasonably control the surface types of the first lens, the second lens and the third lens, reduces the sensitivity of the optical lens, improves the production yield, can effectively control the refractive power of light, slows down the trend of light turning, reduces the difficulty of aberration correction, and is beneficial to improving the relative illumination and the resolving power of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3<CT2/DM2<0.4；（18）
0.1<CT3/DM3<0.2；（19）
where CT2 denotes the center thickness of the second lens, CT3 denotes the center thickness of the third lens, DM2 denotes the effective diameter of the second lens, and DM3 denotes the effective diameter of the third lens. The requirements of the conditional expressions (18) and (19) are met, the calibers of the second lens and the third lens can be reasonably controlled, the size of the optical lens can be favorably reduced, and meanwhile, the forming difficulty of the second lens and the third lens can be reduced, so that the processing sensitivity is reduced, and the yield is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.19<(CT12+CT23)/TTL<0.25；（20）
where CT12 denotes a distance between the first lens and the second lens on the optical axis, CT23 denotes a distance between the second lens and the third lens on the optical axis, and TTL denotes an optical total length of the optical lens. The optical lens meets the conditional expression (20), can reasonably distribute the central thickness of the lens and the spacing distance between the lenses, adjusts light distribution, is beneficial to improving the resolution of the optical lens, and simultaneously realizes the compactness and the miniaturization of the optical lens structure.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
The surface shape of the aspherical lens in each embodiment of the present invention satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction, c is the paraxial curvature radius of the surface, k is the quadric coefficient, A2iIs the aspheric surface type coefficient of 2i order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a stop ST, a second lens L2, a third lens L3, and an infrared filter G1.
The first lens element L1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2;
the second lens L2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4;
the third lens element L3 has negative power, and has a convex object-side surface S5 and a concave image-side surface S6 at the paraxial region and at least one inflection point.
The first lens L1, the second lens L2 and the third lens L3 are all plastic aspheric lenses.
The infrared filter G1 can effectively filter out other light rays except infrared rays, and the optical lens can have higher resolving power in an infrared band.
The parameters related to each lens piece of the optical lens 100 provided in this embodiment are shown in table 1, and in this embodiment, the vertical distance from the optical axis to the point of inflection on the image-side surface S6 of the third lens of the optical lens 100 is 1.69mm, and the rise of the point of inflection with respect to the center of the image-side surface of the third lens is 0.26 mm.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.
TABLE 2
Graphs of curvature of field, distortion and relative illuminance of the optical lens 100 are shown in fig. 2, 3 and 4, respectively. As can be seen from FIG. 2, the meridional field curvature and the sagittal field curvature of different wavelengths are both within + -0.1 mm, which indicates that the field curvature is well corrected. FIG. 3 shows distortion amounts corresponding to different image heights on an image plane, in which the ordinate is the field angle and the abscissa is the F-Tan θ distortion amount, and it can be seen from FIG. 3 that the distortion of the present embodiment is within-1% and all the distortion are negative, indicating that the distortion is well corrected. Fig. 4 shows relative illumination corresponding to different image heights on the imaging surface, in which the ordinate is a relative illumination value and the abscissa is a field angle, and it can be seen from fig. 4 that the relative illumination of the lens at the maximum field of view reaches more than 50%, and the relative illumination of the peripheral field of view is also high, which indicates that the relative illumination of the optical lens 100 is improved well.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 provided in the present embodiment is shown, where the optical lens 200 in the present embodiment has a structure substantially the same as that of the optical lens 100 in the first embodiment, and the difference is that: the materials of the first lens, the second lens and the third lens of the optical lens 200 in this embodiment are different from those of the optical lens 100, and the curvature radii of the respective lenses are different.
The parameters related to each lens in the optical lens 200 provided in this embodiment are shown in table 3. In the present embodiment, the vertical distance from the optical axis to the inflection point on the image-side surface S6 of the third lens of the optical lens 200 is 2.04mm, and the rise of the inflection point with respect to the center of the image-side surface of the third lens is 0.296 mm.
TABLE 3
The surface shape coefficients of the aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
Graphs of curvature of field, distortion and relative illuminance of the optical lens 200 are shown in fig. 6, 7 and 8, respectively. As can be seen from fig. 6, the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.15mm, which indicates that the field curvature of the optical lens 200 is well corrected. As can be seen from fig. 7, the distortion of the present embodiment is within-1%, and the distortion is negative, indicating that the distortion is well corrected. As can be seen from fig. 8, the relative illuminance of the lens at the maximum field of view reaches more than 50%, and the relative illuminance of the peripheral field of view is also higher, which indicates that the relative illuminance of the optical lens 200 is well improved.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to the present embodiment is shown, where the optical lens 300 in the present embodiment has a structure substantially the same as that of the optical lens 100 in the first embodiment, except that: the image-side surface S2 of the first lens element of the optical lens system 300 in this embodiment is convex, and the materials of the first lens element L1, the second lens element L2 and the third lens element L3 are all different from those of the optical lens system 100, and the curvature radii of the respective lens elements are different.
The parameters related to each lens of the optical lens 300 provided in this embodiment are shown in table 5. In the present embodiment, the vertical distance from the optical axis to the inflection point of the image-side surface of the third lens of the optical lens 300 is 2.04mm, and the rise of the inflection point with respect to the center of the image-side surface of the third lens is 0.368 mm.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.
TABLE 6
Graphs of curvature of field, distortion and relative illuminance of the optical lens 300 are shown in fig. 10, 11 and 12, respectively. As can be seen from fig. 10, the meridional field curvature and the sagittal field curvature of different wavelengths are both within ± 0.15mm, which indicates that the field curvature is well corrected. As can be seen from fig. 11, the distortion of the present embodiment is within-1%, and the distortion is negative, indicating that the distortion is well corrected. As can be seen from fig. 12, the relative illuminance of the lens at the maximum field of view reaches more than 50%, and the relative illuminance of the peripheral field of view is also higher, which indicates that the relative illuminance of the optical lens 300 is improved well.
Table 7 shows the optical characteristics corresponding to the above three embodiments, which mainly include the focal length F, F #, total optical length TTL, and field angle FOV, and the values corresponding to each conditional expression.
TABLE 7
In summary, the optical lens provided in the embodiments of the present invention has the following advantages:
(1) the optical lens provided by the invention adopts three plastic aspheric lenses with specific refractive power, the first lens and the second lens are made of plastic materials with low refractive indexes, the production cost is reduced, and the specific surface shape and the matching are adopted, so that the wide-field-angle optical lens has a more compact structure and a smaller volume, and the balance of wide visual angle and lens miniaturization is better realized.
(2) The optical lens provided by the invention has the advantages of wide visual angle, large aperture (aperture can reach 1.6), short total length, small distortion, high infrared imaging quality and the like while meeting the high-quality resolution capability, and not only can better meet the requirements of a DToF lens, but also can meet the requirements of light weight, thinness, shortness and high screen ratio of imaging equipment.
Fourth embodiment
An imaging device 400 is further provided in the present embodiment, please refer to fig. 13, in which the imaging device 400 includes an imaging element 410 and an optical lens (e.g., the optical lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 400 may be a smartphone, Pad, or any other form of portable electronic device that incorporates the optical lens 100.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present 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 lens, comprising, in order from an object side to an image plane along an optical axis: the device comprises a first lens, a diaphragm, a second lens, a third lens and an optical filter;
the first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface or a convex surface;
the second lens has positive focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens element has negative focal power, the object-side surface of the third lens element is convex, the image-side surface of the third lens element is concave at a paraxial region, and the image-side surface of the third lens element has at least one inflection point;
the number of the lenses with focal power in the optical lens is three, and the first lens, the second lens and the third lens are plastic aspheric lenses;
the optical lens satisfies the conditional expression: 1.55< f/EPD < 1.65;
wherein f represents a focal length of the optical lens, and EPD represents an entrance pupil diameter of the optical lens;
the optical lens satisfies the following conditional expression:
0.7<|θ6/θC|<2.3；
wherein, theta6Representing the maximum surface inclination angle theta of the image side surface of the third lensCRepresenting the maximum chief ray incidence angle of the optical lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0<n1<1.55；
0<n2<1.55；
0<n3<1.66；
0.9 <V1/V2<1.1；
wherein n1 denotes a refractive index of the first lens, n2 denotes a refractive index of the second lens, n3 denotes a refractive index of the third lens, V1 denotes an abbe number of the first lens, and V2 denotes an abbe number of the second lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
3mm<(TTL/IH)×f<3.5mm；
wherein, TTL represents the total optical length of the optical lens, IH represents the maximum image height of the optical lens on the imaging surface, and f represents the focal length of the optical lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.21mm-1<tan2 (FOV/2) /DM1<0.23mm-1；
0.2<CT1/DM1<0.3；
wherein FOV represents the maximum angle of view of the optical lens, CT1 represents the center thickness of the first lens, and DM1 represents the effective diameter of the first lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1.2<f3/f<-1.0；
where f3 denotes a focal length of the third lens, and f denotes a focal length of the optical lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.9<(f1+f2+f3)/f<1.1；
-1.3<f1/f3<-1.1；
where f denotes a focal length of the optical lens, f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f3 denotes a focal length of the third lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
3<R2/DM1<23；
2<R5/DM3<5.3；
wherein R2 denotes a radius of curvature of an image side surface of the first lens, R5 denotes a radius of curvature of an object side surface of the third lens, DM1 denotes an effective diameter of the first lens, and DM3 denotes an effective diameter of the third lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1.5<(R1+R2)/(R1-R2)<-1；
3<(R3+R4)/(R3-R4)<3.9；
1<(R5+R6)/(R5-R6)<2.1；
wherein R1 denotes a radius of curvature of an object-side surface of the first lens, R2 denotes a radius of curvature of an image-side surface of the first lens, R3 denotes a radius of curvature of an object-side surface of the second lens, R4 denotes a radius of curvature of an image-side surface of the second lens, R5 denotes a radius of curvature of an object-side surface of the third lens, and R6 denotes a radius of curvature of an image-side surface of the third lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.3<CT2/DM2<0.4；
0.1<CT3/DM3<0.2；
wherein CT2 represents the center thickness of the second lens, CT3 represents the center thickness of the third lens, DM2 represents the effective diameter of the second lens, and DM3 represents the effective diameter of the third lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.19<(CT12+CT23)/TTL<0.25；
wherein CT12 denotes a distance between the first lens and the second lens on the optical axis, CT23 denotes a distance between the second lens and the third lens on the optical axis, and TTL denotes a total optical length of the optical lens.
11. An imaging apparatus comprising the optical lens according to any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| CN202010866914.1A CN111736319B (en) | 2020-08-26 | 2020-08-26 | Optical lens and imaging apparatus |
| PCT/CN2021/114185 WO2022042513A1 (en) | 2020-08-26 | 2021-08-24 | Optical lens and imaging device |
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| CN202010866914.1A CN111736319B (en) | 2020-08-26 | 2020-08-26 | Optical lens and imaging apparatus |
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| CN111736319B (en) * | 2020-08-26 | 2020-11-17 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN112987252B (en) * | 2021-03-05 | 2023-11-07 | 江西晶超光学有限公司 | Optical system, infrared receiving module and electronic equipment |
| CN112666687B (en) * | 2021-03-17 | 2021-07-06 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
| CN113296236B (en) * | 2021-05-12 | 2022-08-30 | 江西晶超光学有限公司 | Infrared optical system, infrared receiving module and electronic equipment |
| CN114217427B (en) * | 2022-02-23 | 2022-07-15 | 江西联益光学有限公司 | Optical lens |
| CN115166948B (en) * | 2022-07-28 | 2023-09-29 | 协益电子（苏州）有限公司 | Low-cost glass-plastic hybrid monitoring lens and electronic equipment |
| CN116381908B (en) * | 2022-12-29 | 2024-05-07 | 湖北华鑫光电有限公司 | Miniaturized 3p wide-angle lens |
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| JP4235007B2 (en) * | 2003-02-21 | 2009-03-04 | 京セラ株式会社 | Imaging lens |
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| CN111061046B (en) * | 2019-10-29 | 2021-06-25 | 江西联创电子有限公司 | Infrared optical imaging lens and imaging device |
| CN111736319B (en) * | 2020-08-26 | 2020-11-17 | 江西联益光学有限公司 | Optical lens and imaging apparatus |
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| JP2007264181A (en) * | 2006-03-28 | 2007-10-11 | Fujinon Corp | Imaging lens |
| TW201115180A (en) * | 2009-10-28 | 2011-05-01 | Largan Precision Co Ltd | Photographing optical lens assembly |
| CN102122057A (en) * | 2010-01-07 | 2011-07-13 | 大立光电股份有限公司 | Camera optical lens group |
| CN103676086A (en) * | 2012-09-10 | 2014-03-26 | 大立光电股份有限公司 | Imaging lens assembly |
| CN105137569A (en) * | 2015-09-02 | 2015-12-09 | 深圳市得润电子股份有限公司 | Viewing lens and viewing apparatus |
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| WO2022042513A1 (en) | 2022-03-03 |
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