CN114594576B - Thin imaging lens group and electronic equipment - Google Patents
Thin imaging lens group and electronic equipment Download PDFInfo
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- CN114594576B CN114594576B CN202210439133.3A CN202210439133A CN114594576B CN 114594576 B CN114594576 B CN 114594576B CN 202210439133 A CN202210439133 A CN 202210439133A CN 114594576 B CN114594576 B CN 114594576B
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- imaging lens
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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
- 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
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Abstract
The invention relates to the technical field of optical imaging, and discloses a thin imaging lens group and electronic equipment, wherein the thin imaging lens group comprises: a first lens element with positive refractive power having a convex object-side surface at a paraxial region; the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the thin imaging lens group satisfies the following relation: 1.53 < N1;1.57 < N2; v2 is more than 25 and less than 30; wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and V2 is the dispersion coefficient of the second lens. By reasonably matching the surface type and the refractive power of each lens and enabling the lens group to meet specific conditions, the optical sensitivity of the three-piece lens group is reduced, so that the assembly difficulty is reduced, the product yield is improved, meanwhile, the lens group has good aberration correcting capability, and the imaging quality is effectively improved.
Description
Technical Field
The present invention relates to the field of optical imaging technologies, and in particular, to a thin imaging lens assembly and an electronic device.
Background
In order to meet the market demand of light and thin, nowadays, the lens mounted on the electronic device is also developed towards light and thin, but with the reduction of the number of lenses, the imaging effect of the lens is hard to be balanced. The existing three-lens has the defects of higher optical sensitivity, high assembly difficulty, low yield and poor imaging quality because the correction of aberration cannot be expected.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a thin imaging lens group and electronic equipment, which solve the problems of low yield and poor imaging quality of a three-lens in the prior art.
In order to achieve the above object, the present invention provides the following technical solutions:
a thin imaging lens group comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the thin imaging lens group satisfies the following relation:
1.53＜N1；
1.57＜N2；
25＜V2＜30；
wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and V2 is the dispersion coefficient of the second lens.
Optionally, the thin imaging lens group further satisfies the following relation:
0.40＜R11/f1＜0.65；
wherein R11 is a radius of curvature of the object-side surface of the first lens, and f1 is a focal length of the first lens.
Optionally, the thin imaging lens group further satisfies the following relation:
2.0≤f2/(R21+R22)≤3.5；
wherein f2 is a focal length of the second lens, R21 is a radius of curvature of an object-side surface of the second lens, and R22 is a radius of curvature of an image-side surface of the second lens.
Optionally, the thin imaging lens group further satisfies the following relation:
3.2＜f3/(R31+R32)＜4.0；
wherein f3 is a focal length of the third lens, R31 is a radius of curvature of an object-side surface of the third lens, and R32 is a radius of curvature of an image-side surface of the third lens.
Optionally, the thin imaging lens group further satisfies the following relation:
3.4＜(f1+f3)/f＜3.7；
wherein f1 is a focal length of the first lens, f3 is a focal length of the third lens, and f is a focal length of the thin imaging lens group.
Optionally, the thin imaging lens group further satisfies the following relation:
3.1＜(CT1+CT3)/CT2＜3.6；
wherein, CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.
Optionally, the thin imaging lens group further satisfies the following relation:
1.45＜SD32/Yc32＜1.75；
wherein SD32 is the maximum effective radius of the image-side surface of the third lens, and Yc32 is the vertical distance between the inflection point of the image-side surface of the third lens and the optical axis.
Optionally, the image side surface of the first lens is concave or convex at the paraxial region, and the refractive index of the first lens is equal to the refractive index of the third lens.
Optionally, the thin imaging lens group further includes a diaphragm, and the diaphragm is disposed at the object side surface of the first lens.
The invention also provides an electronic device comprising the thin imaging lens group according to any one of the above.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a thin imaging lens group and electronic equipment, which enable the optical sensitivity of a three-piece lens group to be reduced by reasonably matching the surface type and the refractive power of each lens and enabling the lens group to meet specific conditions, thereby reducing the assembly difficulty, improving the product yield, enabling the lens group to have good aberration correction capability and effectively improving the imaging quality.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic view of a thin imaging lens assembly according to a first embodiment of the present invention;
fig. 2 is a graph of astigmatism and distortion of a thin imaging lens assembly according to a first embodiment of the present invention;
FIG. 3 is a graph showing spherical aberration curves of a thin imaging lens assembly according to a first embodiment of the present invention;
fig. 4 is a schematic view of a thin imaging lens assembly according to a second embodiment of the present invention;
fig. 5 is a graph of astigmatism and distortion of a thin imaging lens assembly according to a second embodiment of the present invention;
FIG. 6 is a graph showing spherical aberration curves of a thin imaging lens assembly according to a second embodiment of the present invention;
fig. 7 is a schematic view of a thin imaging lens group according to a third embodiment of the present invention;
fig. 8 is a graph of astigmatism and distortion of a thin imaging lens group according to a third embodiment of the present invention in order from left to right;
FIG. 9 is a graph showing spherical aberration curves of a thin imaging lens assembly according to a third embodiment of the present invention;
fig. 10 is a schematic view showing a thin imaging lens group according to a fourth embodiment of the present invention;
fig. 11 is a graph of astigmatism and distortion of a thin imaging lens group according to a fourth embodiment of the present invention;
FIG. 12 is a graph showing spherical aberration curves of a thin imaging lens assembly according to a fourth embodiment of the present invention;
fig. 13 is a schematic view of a thin imaging lens group according to a fifth embodiment of the present invention;
fig. 14 is a graph showing astigmatism and distortion of a thin imaging lens group according to a fifth embodiment of the present invention in order from left to right;
FIG. 15 is a spherical aberration diagram of a thin imaging lens assembly according to a fifth embodiment of the present invention;
fig. 16 is a schematic view showing a thin imaging lens group according to a sixth embodiment of the present invention;
fig. 17 is a graph showing astigmatism and distortion of a thin type imaging lens group according to a sixth embodiment of the present invention in order from left to right;
fig. 18 is a spherical aberration diagram of a thin imaging lens assembly according to a sixth embodiment of the present invention.
In the above figures: e1, a first lens; e2, a second lens; e3, a third lens; e4, an infrared filter; STO and diaphragm; s1, an object side surface of a first lens; s2, an image side surface of the first lens; s3, the object side surface of the second lens; s4, an image side surface of the second lens; s5, the object side surface of the third lens is provided; s6, an image side surface of the third lens; s7, an imaging surface.
Detailed Description
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is apparent that the embodiments described below are only some embodiments of the present invention, not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention. Wherein the exemplary embodiments are described as processes or methods depicted as flowcharts; although a flowchart depicts various operations or step processes as a certain order, many of the operations or steps can be performed in parallel, concurrently or simultaneously, and the order of the various operations can be rearranged. When its operations or steps are completed, the corresponding process may be terminated, and there may be additional steps not included in the drawings. The processes described above may correspond to methods, functions, procedures, subroutines, and the like, and embodiments of the invention and features of the embodiments may be combined with one another without conflict.
The term "comprising" and variants thereof as used herein is intended to be open ended, i.e., including, but not limited to. The term "based on" is based at least in part on. The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings; it is to be understood that for convenience of description, only some, but not all of the structures relevant to the present invention are shown in the drawings.
The invention provides a thin imaging lens group, which comprises a first lens, a second lens and a third lens which are sequentially arranged from an object side to an image side.
Specifically, the first lens element with positive refractive power has a convex object-side surface at a paraxial region, and a concave image-side surface at the paraxial region; the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. Wherein the refractive index of the first lens is equal to the refractive index of the third lens.
The thin imaging lens group further comprises a diaphragm, and the diaphragm is arranged at the object side surface of the first lens. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens group have a longer distance from the imaging surface, so that the imaging lens group has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or the CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens group further comprises an infrared filter, wherein the infrared filter is arranged between the third lens and the imaging surface, and infrared band light entering the lens is filtered through the infrared filter, so that noise generated when infrared light irradiates on the photosensitive chip is avoided. Specifically, the infrared filter may be made of glass material, so as to avoid affecting the focal length.
Further, the thin imaging lens group satisfies the following relation: 1.53 < N1;1.57 < N2; v2 is more than 25 and less than 30; wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and V2 is the dispersion coefficient of the second lens. By defining the refractive indices of the first lens and the second lens and the dispersion coefficient of the second lens, the lens group can be made to correct the system aberration better, thereby having good imaging quality.
Further, the thin imaging lens group also satisfies the following relation: r11/f1 is more than 0.40 and less than 0.65; wherein R11 is a radius of curvature of the object-side surface of the first lens, and f1 is a focal length of the first lens. By reasonably adjusting the ratio of the surface shape of the image side surface of the first lens to the focal length of the first lens, the aberration correction effect of the lens group can be improved.
Further, the thin imaging lens group also satisfies the following relation: f 2/(R21+R22) is less than or equal to 2.0 and less than or equal to 3.5;3.2 < f 3/(R31+R32) < 4.0; wherein f2 is a focal length of the second lens, R21 is a radius of curvature of an object-side surface of the second lens, R22 is a radius of curvature of an image-side surface of the second lens, f3 is a focal length of the third lens, R31 is a radius of curvature of an object-side surface of the third lens, and R32 is a radius of curvature of an image-side surface of the third lens. By reasonably configuring the surface types and focal lengths of the second lens and the third lens, the curvature of field of each view field is balanced in a reasonable range, and the thin imaging lens group has good imaging quality.
Further, the thin imaging lens group also satisfies the following relation: 3.4 < (f1+f3)/f < 3.7; wherein f1 is the focal length of the first lens, f3 is the focal length of the third lens, and f is the focal length of the thin imaging lens assembly. The ratio between the sum of the effective focal lengths of the first lens and the third lens and the focal length of the lens is reasonably controlled, so that the purpose of reasonably distributing the focal power of the optical system is achieved, and the positive and negative spherical differences between the front group lens and the rear lens are counteracted.
Further, the thin imaging lens group also satisfies the following relation: 3.1 < (CT1+CT3)/CT 2 < 3.6; wherein, CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. The thickness of the first lens to the thickness of the third lens are reasonably configured, so that the sensitivity of the thin imaging lens group can be reduced, the yield of the thin imaging lens group can be improved, and the size miniaturization of the thin imaging lens group can be realized.
Further, the thin imaging lens group also satisfies the following relation: SD32/Yc32 is more than 1.45 and less than 1.75; wherein SD32 is the maximum effective radius of the image side surface of the third lens element, and Yc32 is the vertical distance between the inflection point of the image side surface of the third lens element and the optical axis. The coma aberration of the lens group can be corrected by the above-mentioned relational expression.
The embodiments are described in detail below with reference to the accompanying drawings.
Example 1
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of a thin imaging lens assembly according to a first embodiment of the present invention, fig. 2 is an astigmatism and distortion curve diagram of the thin imaging lens assembly according to the first embodiment of the present invention, and fig. 3 is a spherical aberration curve diagram of the thin imaging lens assembly according to the first embodiment of the present invention.
The present embodiment provides a thin imaging lens assembly, which includes a first lens element E1, a second lens element E2 and a third lens element E3 disposed in order from an object side to an image side.
Specifically, the first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region; the second lens element E2 with negative refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region. Wherein, the refractive index of the first lens E1 is equal to the refractive index of the third lens E3.
The thin imaging lens group further comprises a diaphragm STO, and the diaphragm STO is arranged at the object side surface S1 of the first lens E1. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens set generate a longer distance from the imaging surface S7, so that the imaging lens set has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens set further comprises an infrared filter E4, wherein the infrared filter E4 is arranged between the third lens E3 and the imaging surface S7, and infrared band light entering the lens is filtered through the infrared filter E4, so that noise generated when infrared light irradiates the photosensitive chip is avoided. Specifically, the infrared filter E4 may be made of glass material, so as to avoid affecting the focal length.
Please refer to the following tables 1-1, 1-2 and 1-3.
Table 1-1 shows detailed structural data of an embodiment, wherein the unit of the radius of curvature, thickness and focal length is millimeter, f is the focal length of the thin imaging lens assembly, SD32 is the maximum effective radius of the image-side surface of the third lens element, and Yc32 is the vertical distance from the inflection point of the image-side surface of the third lens element to the optical axis.
Tables 1 to 2 are aspherical coefficient data in the first embodiment, wherein k represents the cone coefficients in the aspherical curve equation, and A4, A6, A8, a10, a12, a14, a16, a18 and a20 represent the aspherical coefficients of the 4 th, 6, 8, 10, 12, 14, 16, 18 and 20 th order of each surface.
Tables 1 to 3 show conditions satisfied by the thin imaging lens group in the first embodiment.
In addition, the following tables of the embodiments are schematic diagrams and graphs corresponding to the embodiments, and the definition of data in the tables is the same as that of tables 1-1, 1-2 and 1-3 of the first embodiment, and will not be described herein.
Example two
Referring to fig. 4 to 6, fig. 4 is a schematic diagram of a thin imaging lens assembly according to a second embodiment of the present invention, fig. 5 is an astigmatism and distortion curve diagram of the thin imaging lens assembly according to the second embodiment of the present invention, and fig. 6 is a spherical aberration curve diagram of the thin imaging lens assembly according to the second embodiment of the present invention.
The present embodiment provides a thin imaging lens assembly, which includes a first lens element E1, a second lens element E2 and a third lens element E3 disposed in order from an object side to an image side.
Specifically, the first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a convex image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region. Wherein, the refractive index of the first lens E1 is equal to the refractive index of the third lens E3.
The thin imaging lens group further comprises a diaphragm STO, and the diaphragm STO is arranged at the object side surface S1 of the first lens E1. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens set generate a longer distance from the imaging surface S7, so that the imaging lens set has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens set further comprises an infrared filter E4, wherein the infrared filter E4 is arranged between the third lens E3 and the imaging surface S7, and infrared band light entering the lens is filtered through the infrared filter E4, so that noise generated when infrared light irradiates the photosensitive chip is avoided. Specifically, the infrared filter E4 may be made of glass material, so as to avoid affecting the focal length.
Please refer to the following tables 2-1, 2-2 and 2-3.
Example III
Referring to fig. 7 to fig. 9, fig. 7 is a schematic diagram of a thin imaging lens assembly according to a third embodiment of the present invention, fig. 8 is an astigmatism and distortion curve of the thin imaging lens assembly according to the third embodiment of the present invention, and fig. 9 is a spherical aberration curve of the thin imaging lens assembly according to the third embodiment of the present invention.
The present embodiment provides a thin imaging lens assembly, which includes a first lens element E1, a second lens element E2 and a third lens element E3 disposed in order from an object side to an image side.
Specifically, the first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a convex image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region. Wherein, the refractive index of the first lens E1 is equal to the refractive index of the third lens E3.
The thin imaging lens group further comprises a diaphragm STO, and the diaphragm STO is arranged at the object side surface S1 of the first lens E1. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens set generate a longer distance from the imaging surface S7, so that the imaging lens set has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens set further comprises an infrared filter E4, wherein the infrared filter E4 is arranged between the third lens E3 and the imaging surface S7, and infrared band light entering the lens is filtered through the infrared filter E4, so that noise generated when infrared light irradiates the photosensitive chip is avoided. Specifically, the infrared filter E4 may be made of glass material, so as to avoid affecting the focal length.
Please refer to the following tables 3-1, 3-2 and 3-3.
Example IV
Referring to fig. 10 to 12, fig. 10 is a schematic view of a thin imaging lens assembly according to a fourth embodiment of the present invention, fig. 11 is an astigmatism and distortion curve of the thin imaging lens assembly according to the fourth embodiment of the present invention, and fig. 12 is a spherical aberration curve of the thin imaging lens assembly according to the fourth embodiment of the present invention.
The present embodiment provides a thin imaging lens assembly, which includes a first lens element E1, a second lens element E2 and a third lens element E3 disposed in order from an object side to an image side.
Specifically, the first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region; the second lens element E2 with negative refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region. Wherein, the refractive index of the first lens E1 is equal to the refractive index of the third lens E3.
The thin imaging lens group further comprises a diaphragm STO, and the diaphragm STO is arranged at the object side surface S1 of the first lens E1. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens set generate a longer distance from the imaging surface S7, so that the imaging lens set has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens set further comprises an infrared filter E4, wherein the infrared filter E4 is arranged between the third lens E3 and the imaging surface S7, and infrared band light entering the lens is filtered through the infrared filter E4, so that noise generated when infrared light irradiates the photosensitive chip is avoided. Specifically, the infrared filter E4 may be made of glass material, so as to avoid affecting the focal length.
Please refer to the following tables 4-1, 4-2 and 4-3.
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Example five
Referring to fig. 13 to 15, fig. 13 is a schematic diagram of a thin imaging lens assembly according to a fifth embodiment of the present invention, fig. 14 is an astigmatism and distortion curve of the thin imaging lens assembly according to the fifth embodiment of the present invention, and fig. 15 is a spherical aberration curve of the thin imaging lens assembly according to the fifth embodiment of the present invention.
The present embodiment provides a thin imaging lens assembly, which includes a first lens element E1, a second lens element E2 and a third lens element E3 disposed in order from an object side to an image side.
Specifically, the first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a convex image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region. Wherein, the refractive index of the first lens E1 is equal to the refractive index of the third lens E3.
The thin imaging lens group further comprises a diaphragm STO, and the diaphragm STO is arranged at the object side surface S1 of the first lens E1. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens set generate a longer distance from the imaging surface S7, so that the imaging lens set has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens set further comprises an infrared filter E4, wherein the infrared filter E4 is arranged between the third lens E3 and the imaging surface S7, and infrared band light entering the lens is filtered through the infrared filter E4, so that noise generated when infrared light irradiates the photosensitive chip is avoided. Specifically, the infrared filter E4 may be made of glass material, so as to avoid affecting the focal length.
Please refer to the following tables 5-1, 5-2 and 5-3.
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Example six
Referring to fig. 16 to 18, fig. 16 is a schematic view showing a thin imaging lens assembly according to a sixth embodiment of the present invention, fig. 17 is an astigmatism and distortion curve of the thin imaging lens assembly according to the sixth embodiment of the present invention, and fig. 18 is a spherical aberration curve of the thin imaging lens assembly according to the sixth embodiment of the present invention.
The present embodiment provides a thin imaging lens assembly, which includes a first lens element E1, a second lens element E2 and a third lens element E3 disposed in order from an object side to an image side.
Specifically, the first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region and a concave image-side surface S2 at a paraxial region; the second lens element E2 with negative refractive power has a concave object-side surface S3 at a paraxial region and a convex image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a convex object-side surface S5 at a paraxial region and a concave image-side surface S6 at a paraxial region. Wherein, the refractive index of the first lens E1 is equal to the refractive index of the third lens E3.
The thin imaging lens group further comprises a diaphragm STO, and the diaphragm STO is arranged at the object side surface S1 of the first lens E1. The front diaphragm can make the Exit Pupil (Exit Pupil) of the thin imaging lens set generate a longer distance from the imaging surface S7, so that the imaging lens set has a Telecentric (Telecentric) effect, and the efficiency of receiving images by the CCD or CMOS of the electronic photosensitive element can be increased.
In addition, the thin imaging lens set further comprises an infrared filter E4, wherein the infrared filter E4 is arranged between the third lens E3 and the imaging surface S7, and infrared band light entering the lens is filtered through the infrared filter E4, so that noise generated when infrared light irradiates the photosensitive chip is avoided. Specifically, the infrared filter E4 may be made of glass material, so as to avoid affecting the focal length.
Please refer to the following tables 6-1, 6-2 and 6-3.
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Example seven
An embodiment of the present invention provides an electronic device including the thin imaging lens group provided in any one of the embodiments above.
Based on the foregoing embodiments, the present invention provides a thin imaging lens assembly and an electronic device, where the optical sensitivity of the three-lens assembly is reduced by reasonably matching the surface shape and refractive power of each lens and making the lens assembly meet specific conditions, so as to reduce the assembly difficulty, improve the product yield, and simultaneously make the lens assembly have good aberration correction capability, and effectively improve the imaging quality.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. The thin imaging lens group is characterized in that the thin imaging lens group comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side;
the first lens element with positive refractive power has a convex object-side surface at a paraxial region;
the second lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the third lens element with positive refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the thin imaging lens group satisfies the following relation:
1.53＜N1；
1.57＜N2；
25＜V2＜30；
wherein N1 is the refractive index of the first lens, N2 is the refractive index of the second lens, and V2 is the abbe number of the second lens;
the thin imaging lens group also satisfies the following relation:
0.40＜R11/f1＜0.65；
wherein R11 is a radius of curvature of the object-side surface of the first lens, and f1 is a focal length of the first lens;
the thin imaging lens group also satisfies the following relation:
3.2＜f3/(R31+R32)＜4.0；
wherein f3 is a focal length of the third lens, R31 is a radius of curvature of an object-side surface of the third lens, and R32 is a radius of curvature of an image-side surface of the third lens;
the thin imaging lens group also satisfies the following relation:
3.4＜(f1+f3)/f＜3.7；
wherein f1 is a focal length of the first lens, f3 is a focal length of the third lens, and f is a focal length of the thin imaging lens group;
the thin imaging lens group also satisfies the following relation:
1.45＜SD32/Yc32＜1.75；
wherein SD32 is the maximum effective radius of the image-side surface of the third lens, and Yc32 is the vertical distance between the inflection point of the image-side surface of the third lens and the optical axis.
2. The thin imaging lens group according to claim 1, wherein the following relation is also satisfied:
2.0≤f2/(R21+R22)≤3.5；
wherein f2 is a focal length of the second lens, R21 is a radius of curvature of an object-side surface of the second lens, and R22 is a radius of curvature of an image-side surface of the second lens.
3. The thin imaging lens group according to claim 1, wherein the following relation is also satisfied:
3.1＜(CT1+CT3)/CT2＜3.6；
wherein, CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis.
4. The thin imaging lens assembly of claim 1, wherein an image side surface of the first lens element is concave or convex at a paraxial region, and a refractive index of the first lens element is equal to a refractive index of the third lens element.
5. The thin imaging lens group according to claim 1, further comprising a diaphragm provided at an object side surface of the first lens.
6. An electronic device comprising the thin imaging lens group according to any one of claims 1 to 5.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1078543A (en) * | 1996-09-04 | 1998-03-24 | Olympus Optical Co Ltd | Optical system |
| TW201142404A (en) * | 2010-05-27 | 2011-12-01 | Largan Precision Co Ltd | Photographing optical lens system |
| CN106154496A (en) * | 2016-04-27 | 2016-11-23 | 玉晶光电(厦门)有限公司 | Optical imaging lens and portable electron device |
| CN113504631A (en) * | 2021-07-22 | 2021-10-15 | 广东旭业光电科技股份有限公司 | Lens assembly and light and thin camera lens |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008203449A (en) * | 2007-02-19 | 2008-09-04 | Sony Corp | Zoom lens and imaging apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1078543A (en) * | 1996-09-04 | 1998-03-24 | Olympus Optical Co Ltd | Optical system |
| TW201142404A (en) * | 2010-05-27 | 2011-12-01 | Largan Precision Co Ltd | Photographing optical lens system |
| CN106154496A (en) * | 2016-04-27 | 2016-11-23 | 玉晶光电(厦门)有限公司 | Optical imaging lens and portable electron device |
| CN113504631A (en) * | 2021-07-22 | 2021-10-15 | 广东旭业光电科技股份有限公司 | Lens assembly and light and thin camera lens |
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