CN114002813B - Five-piece type lens module and electronic equipment - Google Patents
Five-piece type lens module and electronic equipment Download PDFInfo
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- CN114002813B CN114002813B CN202111308570.3A CN202111308570A CN114002813B CN 114002813 B CN114002813 B CN 114002813B CN 202111308570 A CN202111308570 A CN 202111308570A CN 114002813 B CN114002813 B CN 114002813B
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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
- G02B13/0045—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
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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 a five-piece type lens module and electronic equipment, the lens module includes: the first lens element with positive refractive power has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive power has a convex object-side surface and a concave image-side surface; the third lens element with positive refractive power has a concave object-side surface and a convex image-side surface; a fourth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a fifth lens element with negative refractive power having a concave object-side surface and a concave image-side surface; the lens module satisfies the following relation: -3.0 < R32-R42 < -2.0; TTL/f is more than or equal to 1.0 and less than or equal to 1.4. The optical total length of the five-lens module is controlled within a reasonable range, and the refractive power and the surface shape of each lens in the five-lens module are reasonably matched, so that good imaging effect can be achieved under the conditions of light weight and small volume.
Description
Technical Field
The invention relates to the technical field of optical imaging, in particular to a five-piece type lens module and electronic equipment.
Background
In the field of machine vision, an optical lens has a direct influence on the quality of imaging. In recent years, due to the variety and function of lenses becoming more and more abundant, electronic devices equipped with various lenses gradually enter people's lives and change people's life style, such as a motion camera and a car recorder.
Because the electronic devices such as the motion camera and the automobile data recorder have higher requirements on volume and weight, the lens arranged in the electronic devices needs to have good imaging effect under the condition of light weight and small volume, and how to balance the relationship among the weight, the volume and the imaging effect becomes a technical problem to be solved urgently by the person skilled in the art.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a five-piece type lens module and electronic equipment, which solve the problem that the lens in the prior art is difficult to achieve good imaging effect under the conditions of light weight and small volume.
In order to achieve the above object, the present invention provides the following technical solutions:
a five-piece lens module sequentially comprises from an object side to an image side: the lens assembly comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein each surface from an object side surface of the first lens to an image side surface of the fifth lens is an aspheric surface;
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 a paraxial region;
the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fourth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the five-piece lens module meets the following relation:
-3.0＜R32-R42＜-2.0；
1.0≤TTL/f≤1.4；
wherein, R32 is a radius of curvature of the image side of the third lens element, R42 is a radius of curvature of the image side of the fourth lens element, TTL is a distance between the object side of the first lens element and the image plane on the optical axis, and f is a focal length of the five-lens assembly.
Optionally, the five-piece lens module satisfies the following relation:
0.25＜T34/AAT＜0.65；
wherein T34 is an air gap between the image side surface of the third lens element and the object side surface of the fourth lens element on the optical axis, and AAT is a sum of air gaps between adjacent lens elements of the first lens element and the fifth lens element.
Optionally, the five-piece lens module satisfies the following relation:
0.4≤f/(f1+f4)≤0.75；
wherein f is the focal length of the five-lens module, f1 is the focal length of the first lens, and f4 is the focal length of the fourth lens.
Optionally, the five-piece lens module satisfies the following relation:
0.7＜f/f123＜1.15；
wherein f is the focal length of the five-lens module, and f123 is the focal length of the first lens, the second lens and the third lens.
Optionally, the five-piece lens module satisfies the following relation:
4.1＜f2/f5＜4.7；
wherein f2 is the focal length of the second lens, and f5 is the focal length of the fifth lens.
Optionally, the five-piece lens module satisfies the following relation:
1.9＜CT4/CT5＜2.4；
wherein, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.
Optionally, the five-piece lens module satisfies the following relation:
0.1＜Yc52/f＜0.4，
wherein Yc52 is the vertical distance between the inflection point of the image side of the fifth lens element and the optical axis, and f is the focal length of the five-lens assembly.
Optionally, the five-piece lens module satisfies the following relation:
0.1＜SAG22/SD22＜0.3；
the SAG22 is a horizontal displacement amount from an intersection point of the image side surface of the second lens on the optical axis to a position of a maximum effective radius of the side surface of the second lens image on the optical axis, and SD22 is a maximum effective radius of the image side surface of the second lens.
Optionally, the lens further comprises a diaphragm, and the diaphragm is arranged on the object side of the first lens.
The invention also provides electronic equipment, which comprises a five-piece lens module for collecting the optical patterns, wherein the five-piece lens module is any one of the five-piece lens module, and the electronic equipment further comprises an imaging element for converting the optical patterns collected by the five-piece lens module into electric signals.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a five-piece lens module and electronic equipment, which meet the requirement of miniaturization of the electronic equipment by controlling the total optical length of the five-piece lens module within a reasonable range. Meanwhile, the refractive power and the surface shape of each lens in the five-lens module are reasonably matched, so that the five-lens module still has excellent imaging effect in a darker environment, and therefore, good imaging effect is achieved under the conditions of light weight and small volume.
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 diagram of a five-piece lens module according to a first embodiment of the present invention;
fig. 2 is a graph of astigmatism and distortion of a five-lens module according to a first embodiment of the present invention;
FIG. 3 is a graph showing spherical aberration of a five-lens module according to a first embodiment of the present invention;
fig. 4 is a schematic diagram of a five-lens module according to a second embodiment of the invention;
fig. 5 is a graph of astigmatism and distortion of a five-lens module according to a second embodiment of the present invention;
FIG. 6 is a graph showing spherical aberration of a five-lens module according to a second embodiment of the present invention;
FIG. 7 is a schematic diagram of a five-piece lens module according to a third embodiment of the present invention;
FIG. 8 is a graph showing astigmatism and distortion of a five-lens module according to a third embodiment of the present invention;
FIG. 9 is a graph showing spherical aberration of a five-lens module according to a third embodiment of the present invention;
FIG. 10 is a schematic diagram of a five-piece lens module according to a fourth embodiment of the present invention;
FIG. 11 is a graph showing astigmatism and distortion of a five-lens module according to a fourth embodiment of the present invention;
FIG. 12 is a graph showing spherical aberration of a five-lens module according to a fourth embodiment of the present invention;
FIG. 13 is a schematic diagram of a five-piece lens module according to a fifth embodiment of the present invention;
fig. 14 is a graph showing astigmatism and distortion of a five-lens module according to a fifth embodiment of the present invention;
fig. 15 is a spherical aberration diagram of a five-lens module according to a fifth embodiment of the invention.
In the above figures:
e1, a first lens; e2, a second lens; e3, a third lens; e4, a fourth lens; e5, a fifth lens; e6, an optical 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 object side surface of the fourth lens; s8, an image side surface of the fourth lens is provided; s9, an object side surface of the fifth lens; s10, an image side surface of the fifth lens; s11, an object side surface of the optical filter; s12, an image side surface of the optical filter; s13, 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.
In the description of the present invention, it will be understood that when one component is referred to as being "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present.
Furthermore, the terms "long," "short," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship based on that shown in the drawings, for convenience of description of the present invention, and are not intended to indicate or imply that the apparatus or elements referred to must have this particular orientation, operate in a particular orientation configuration, and thus should not be construed as limiting the invention.
The invention provides the following technical scheme to solve the problem that the lens in the prior art is difficult to achieve good imaging effect under the conditions of light weight and small volume.
Specifically, the five-lens module sequentially comprises, from an object side to an image side: the object side surface of the first lens is aspheric to each surface of the image side surface of the fifth lens.
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 a paraxial region; the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the third lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the fourth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region; the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
A light filter is arranged between the fifth lens and the imaging surface, the light filter is provided with an object side surface and an image side surface, and light from an object sequentially passes through the surfaces and finally is imaged on the imaging surface.
Specifically, the five-piece lens module satisfies the following relation: -3.0 < R32-R42 < -2.0; TTL/f is more than or equal to 1.0 and less than or equal to 1.4; wherein, R32 is a radius of curvature of the image side of the third lens element, R42 is a radius of curvature of the image side of the fourth lens element, TTL is a distance between the object side of the first lens element and the image plane on the optical axis, and f is a focal length of the five-lens assembly.
By defining the curvature radius of the two opposite surfaces of the third lens and the fourth lens, the deflection degree of the light rays passing through the third lens and the fourth lens is reduced, so that the phase difference is reduced, and the imaging effect in a darker environment is improved.
In addition, the ratio between the total optical length and the focal length of the five-piece lens module is reasonably regulated, so that the characteristic of the tele lens is maintained.
Further, the five-piece lens module satisfies the following relation: T34/AAT less than 0.25 and less than 0.65; wherein T34 is an air gap between the image side surface of the third lens element and the object side surface of the fourth lens element on the optical axis, and AAT is a sum of air gaps between adjacent lens elements of the first lens element and the fifth lens element. Through the relational expression, the sensitivity of the five-piece type lens module can be reduced, the imaging quality is improved, and meanwhile, the miniaturization of the five-piece type lens module is kept.
Further, the five-piece lens module satisfies the following relation: f/(f1+f4) is more than or equal to 0.4 and less than or equal to 0.75, f/f123 is more than 0.7 and less than 1.15, and f2/f5 is more than 4.1 and less than 4.7; wherein f is the focal length of the five-lens module, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f4 is the focal length of the fourth lens, f5 is the focal length of the fifth lens, and f123 is the focal length of the first lens, the second lens and the third lens. When the five-piece lens module meets the above relation, the magnitude and configuration of the refractive power between the lenses can be effectively controlled and adjusted, so as to achieve the purpose of correcting aberration, and the lens module has better light transmittance and aberration elimination effect, thereby meeting the requirements of high pixel and large image height.
Further, the five-piece lens module satisfies the following relation: CT4/CT5 is more than 1.9 and less than 2.4; wherein, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis. The thicknesses of the fourth lens and the fifth lens are defined in a reasonable range, so that the volume of the lens module can be further shortened under the condition of ensuring the optical imaging effect, and the requirement of volume miniaturization is met.
Further, the five-piece lens module satisfies the following relation: yc52/f is more than 0.1 and less than 0.4, wherein Yc52 is the vertical distance between the inflection point of the image side surface of the fifth lens and the optical axis, and f is the focal length of the five-lens-group lens assembly. When the five-piece lens module meets the above relation, it is beneficial to correct Petzval number (Petzval) so as to improve the image quality of the off-axis view field.
Further, the five-piece lens module satisfies the following relation: SAG22/SD22 is more than 0.1 and less than 0.3; the SAG22 is a horizontal displacement amount from an intersection point of the image side surface of the second lens on the optical axis to a position of a maximum effective radius of the side surface of the second lens image on the optical axis, and SD22 is a maximum effective radius of the image side surface of the second lens.
By controlling the value of SAG22/SD22 to be greater than 0.1, the second lens can be ensured to have sufficient negative focal power, which is beneficial to correcting various aberrations; by controlling the SAG22/SD22 value to be less than 0.3, the situation that the angle formed by the peripheral part of the second lens and the tangent line is too small can be avoided, so that the processability of the five-piece lens module is improved, the further realization of volume miniaturization is facilitated, and meanwhile, the manufacturing cost can be reduced.
Example 1
Referring to fig. 1 to 3, fig. 1 is a schematic diagram of a five-lens module according to a first embodiment of the present invention, fig. 2 is an astigmatism and distortion curve diagram of the five-lens module according to the first embodiment of the present invention, and fig. 3 is a spherical aberration curve diagram of the five-lens module according to the first embodiment of the present invention.
In this embodiment, the five-lens module includes, in order from an object side to an image side: the surfaces of the aperture stop STO, the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5, respectively, of the object-side surface S1 of the first lens element E1 to the image-side surface S10 of the fifth lens element E5 are aspheric.
The first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a concave image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a concave object-side surface S5 at a paraxial region thereof and a convex image-side surface S6 at a paraxial region thereof; the fourth lens element E4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the fifth lens element E5 with negative refractive power has a concave object-side surface S9 at a paraxial region thereof and a concave image-side surface S10 at a paraxial region thereof.
A filter E6 is arranged between the fifth lens E5 and the imaging surface 13, and the filter E6 is an infrared filter; the filter E6 has an object side surface S11 and an image side surface S12, and light from an object sequentially passes through each of the surfaces S1 to S12 and is finally imaged on the imaging surface 13.
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 curvature radius, thickness and focal length is millimeter, f is the focal length of the optical imaging lens, fno is the aperture value, and HFOV is half of the maximum field angle of the optical imaging lens.
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 optical imaging lens 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 five-lens module according to a second embodiment of the invention, fig. 5 is an astigmatism and distortion curve diagram of the five-lens module according to the second embodiment of the invention, and fig. 6 is a spherical aberration curve diagram of the five-lens module according to the second embodiment of the invention.
In this embodiment, the five-lens module includes, in order from an object side to an image side: the surfaces of the aperture stop STO, the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5, respectively, of the object-side surface S1 of the first lens element E1 to the image-side surface S10 of the fifth lens element E5 are aspheric.
The first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a concave image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a concave object-side surface S5 at a paraxial region thereof and a convex image-side surface S6 at a paraxial region thereof; the fourth lens element E4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the fifth lens element E5 with negative refractive power has a concave object-side surface S9 at a paraxial region thereof and a concave image-side surface S10 at a paraxial region thereof.
A filter E6 is arranged between the fifth lens E5 and the imaging surface 13, and the filter E6 is an infrared filter; the filter E6 has an object side surface S11 and an image side surface S12, and light from an object sequentially passes through each of the surfaces S1 to S12 and is finally imaged on the imaging surface 13.
Please refer to the following tables 2-1, 2-2 and 2-3.
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Example III
Referring to fig. 7 to fig. 9, fig. 7 is a schematic diagram of a five-lens module according to a third embodiment of the present invention, fig. 8 is an astigmatism and distortion curve of the five-lens module according to the third embodiment of the present invention, and fig. 9 is a spherical aberration curve of the five-lens module according to the third embodiment of the present invention.
In this embodiment, the five-lens module includes, in order from an object side to an image side: the surfaces of the aperture stop STO, the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5, respectively, of the object-side surface S1 of the first lens element E1 to the image-side surface S10 of the fifth lens element E5 are aspheric.
The first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a concave image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a concave object-side surface S5 at a paraxial region thereof and a convex image-side surface S6 at a paraxial region thereof; the fourth lens element E4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the fifth lens element E5 with negative refractive power has a concave object-side surface S9 at a paraxial region thereof and a concave image-side surface S10 at a paraxial region thereof.
A filter E6 is arranged between the fifth lens E5 and the imaging surface 13, and the filter E6 is an infrared filter; the filter E6 has an object side surface S11 and an image side surface S12, and light from an object sequentially passes through each of the surfaces S1 to S12 and is finally imaged on the imaging surface 13.
Please refer to the following tables 3-1, 3-2 and 3-3.
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Example IV
Referring to fig. 10 to 12, fig. 10 is a schematic diagram of a five-lens module according to a fourth embodiment of the present invention, fig. 11 is an astigmatism and distortion curve of the five-lens module according to the fourth embodiment of the present invention, and fig. 12 is a spherical aberration curve of the five-lens module according to the fourth embodiment of the present invention.
In this embodiment, the five-lens module includes, in order from an object side to an image side: the surfaces of the aperture stop STO, the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5, respectively, of the object-side surface S1 of the first lens element E1 to the image-side surface S10 of the fifth lens element E5 are aspheric.
The first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a concave image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a concave object-side surface S5 at a paraxial region thereof and a convex image-side surface S6 at a paraxial region thereof; the fourth lens element E4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the fifth lens element E5 with negative refractive power has a concave object-side surface S9 at a paraxial region thereof and a concave image-side surface S10 at a paraxial region thereof.
A filter E6 is arranged between the fifth lens E5 and the imaging surface 13, and the filter E6 is an infrared filter; the filter E6 has an object side surface S11 and an image side surface S12, and light from an object sequentially passes through each of the surfaces S1 to S12 and is finally imaged on the imaging surface 13.
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 five-lens module according to a fifth embodiment of the present invention, fig. 14 is an astigmatism and distortion curve of the five-lens module according to the fifth embodiment of the present invention, and fig. 15 is a spherical aberration curve of the five-lens module according to the fifth embodiment of the present invention.
In this embodiment, the five-lens module includes, in order from an object side to an image side: the surfaces of the aperture stop STO, the first lens element E1, the second lens element E2, the third lens element E3, the fourth lens element E4 and the fifth lens element E5, respectively, of the object-side surface S1 of the first lens element E1 to the image-side surface S10 of the fifth lens element E5 are aspheric.
The first lens element E1 with positive refractive power has a convex object-side surface S1 at a paraxial region thereof and a concave image-side surface S2 at a paraxial region thereof; the second lens element E2 with negative refractive power has a convex object-side surface S3 at a paraxial region and a concave image-side surface S4 at a paraxial region; the third lens element E3 with positive refractive power has a concave object-side surface S5 at a paraxial region thereof and a convex image-side surface S6 at a paraxial region thereof; the fourth lens element E4 with positive refractive power has a concave object-side surface S7 at a paraxial region and a convex image-side surface S8 at a paraxial region; the fifth lens element E5 with negative refractive power has a concave object-side surface S9 at a paraxial region thereof and a concave image-side surface S10 at a paraxial region thereof.
A filter E6 is arranged between the fifth lens E5 and the imaging surface 13, and the filter E6 is an infrared filter; the filter E6 has an object side surface S11 and an image side surface S12, and light from an object sequentially passes through each of the surfaces S1 to S12 and is finally imaged on the imaging surface 13.
Please refer to the following tables 5-1, 5-2 and 5-3.
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Example six
Based on the foregoing embodiments, the present invention further provides an electronic device, including a five-piece lens module for collecting an optical pattern, and further including an imaging element for converting the optical pattern collected by the five-piece lens module into an electrical signal. The five-piece lens module is any one of the five-piece lens modules described in the above embodiments.
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 (9)
1. A five-piece lens module is characterized by comprising, in order from an object side to an image side: the lens assembly comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens, wherein each surface from an object side surface of the first lens to an image side surface of the fifth lens is an aspheric surface;
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 a paraxial region;
the second lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the third lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fourth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region;
the fifth lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the five-piece lens module meets the following relation:
-3.0＜R32-R42＜-2.0；
1.0≤TTL/f≤1.4；
4.1＜f2/f5＜4.7；
wherein, R32 is a radius of curvature of the image side of the third lens element, R42 is a radius of curvature of the image side of the fourth lens element, TTL is a distance between the object side of the first lens element and the image plane on the optical axis, f is a focal length of the five-lens assembly, f2 is a focal length of the second lens element, and f5 is a focal length of the fifth lens element.
2. The five-piece lens module of claim 1, wherein the five-piece lens module satisfies the following relationship:
0.25＜T34/AAT＜0.65；
wherein T34 is an air gap between the image side surface of the third lens element and the object side surface of the fourth lens element on the optical axis, and AAT is a sum of air gaps between adjacent lens elements of the first lens element and the fifth lens element.
3. The five-piece lens module of claim 1, wherein the five-piece lens module satisfies the following relationship:
0.4≤f/(f1+f4)≤0.75；
wherein f is the focal length of the five-lens module, f1 is the focal length of the first lens, and f4 is the focal length of the fourth lens.
4. The five-piece lens module of claim 1, wherein the five-piece lens module satisfies the following relationship:
0.7＜f/f123＜1.15；
wherein f is the focal length of the five-lens module, and f123 is the combined focal length of the first lens, the second lens and the third lens.
5. The five-piece lens module of claim 1, wherein the five-piece lens module satisfies the following relationship:
1.9＜CT4/CT5＜2.4；
wherein, CT4 is the thickness of the fourth lens on the optical axis, and CT5 is the thickness of the fifth lens on the optical axis.
6. The five-piece lens module of claim 1, wherein the five-piece lens module satisfies the following relationship:
0.1＜Yc52/f＜0.4，
wherein Yc52 is the vertical distance between the inflection point of the image side of the fifth lens element and the optical axis, and f is the focal length of the five-lens assembly.
7. The five-piece lens module of claim 1, wherein the five-piece lens module satisfies the following relationship:
0.1＜SAG22/SD22＜0.3；
the SAG22 is a horizontal displacement amount from an intersection point of the image side surface of the second lens on the optical axis to a position of a maximum effective radius of the side surface of the second lens image on the optical axis, and SD22 is a maximum effective radius of the image side surface of the second lens.
8. The five-lens module as recited in claim 1, further comprising a diaphragm disposed on an object side of the first lens.
9. An electronic device is characterized by comprising a five-piece lens module for collecting an optical pattern and an imaging element for converting the optical pattern into an electric signal;
the five-piece lens module is the five-piece lens module of any one of claims 1 to 8.
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