Endoscope optical imaging lens and electronic device

Abstract

The application discloses an endoscope optical imaging lens and electronic equipment, the lens is composed of first, second and third lenses arranged in sequence from the object side to the image side, the first lens has positive refractive power, the object side surface and the image side surface thereof are convex respectively, the second lens has negative refractive power, the object side surface and the image side surface thereof are concave and convex respectively, and the third lens has refractive power, the object side surface and the image side surface thereof are convex respectively; the lens satisfies the following conditions: 0.023 < SAG11 / SD11 < 0.08; 0.4 < f1 / f < 1.0; 0.5 < R22 / f2 < 2.8; SAG11 is the sag of the image side surface of the first lens, SD11 is the maximum effective radius of the object side surface of the first lens, f is the focal length of the endoscope optical imaging lens, f1 is the focal length of the first lens, R22 is the curvature radius of the image side surface of the second lens, and f2 is the focal length of the second lens. The application can correct aberration well, has high pixels, high resolution and excellent imaging quality, and can meet the requirements of endoscope application.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical imaging technology, and in particular to an endoscope optical imaging lens and electronic equipment. BACKGROUND

[0002] With the development trend of miniaturization of the lens demand, the market now has higher requirements for the small size of the endoscope, and also requires the endoscope to maintain high-definition imaging while achieving small size.

[0003] In order to achieve small size, the lenses of the endoscope on the market are reduced to shorten the length of the lens, but this will cause the imaging quality of the endoscope to decline, making it difficult to meet the actual use requirements. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application provides an endoscope optical imaging lens and electronic equipment, which solves the problem that the volume miniaturization and imaging quality of the endoscope in the prior art are difficult to be considered.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0006] An endoscope optical imaging lens is composed of a first lens, a second lens and a third lens arranged in order from the object side to the image side, wherein each surface from the object side surface of the first lens to the image side surface of the third lens is aspherical.

[0007] The first lens has positive refractive power, and its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis.

[0008] The second lens has negative refractive power, and its object side surface is concave near the optical axis, and its image side surface is convex near the optical axis.

[0009] The third lens has refractive power, and its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis.

[0010] And meet the following conditional expressions:

[0011] 0.023

[0012] 0.4

[0013] 0.5

[0014] Wherein, SAG11 is the sag of the object side surface of the first lens, SD11 is the maximum effective radius of the object side surface of the second lens, f is the focal length of the endoscope optical imaging lens, f1 is the focal length of the first lens, R22 is the curvature radius of the image side surface of the second lens, and f2 is the focal length of the second lens.

[0015] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0016] 0.3 < SD31 / R31 < 2.0:

[0017] Wherein, SD31 is the maximum effective radius of the object side surface of the third lens, and R31 is the curvature radius of the object side surface of the third lens.

[0018] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0019] 0.32 < f3 / f < 1.2;

[0020] Wherein, f3 is the focal length of the third lens, and f is the focal length of the endoscope optical imaging lens.

[0021] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0022] 1.0 < (f1+f3) / (ct1+ct3) < 3.2;

[0023] Wherein, f1 is the focal length of the first lens, f3 is the focal length of the third lens, ct1 is the center thickness of the first lens, and ct3 is the center thickness of the third lens.

[0024] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0025] 0.15 < EPD / D32 < 0.65;

[0026] Wherein, EPD is the entrance pupil diameter of the endoscope optical imaging lens, and D32 is the effective diameter of the image side surface of the third lens.

[0027] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0028] 0.8 ≤ ∑CT / ∑ET ≤ 1.9;

[0029] Wherein, ∑CT is the sum of the distances between the center optical axes of the lenses, and ∑ET is the sum of the edge thicknesses of the lenses.

[0030] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0031] 0.2 < f / TTL < 0.7;

[0032] Wherein, f is the focal length of the endoscope optical imaging lens, and TTL is the total optical length of the endoscope optical imaging lens.

[0033] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0034] -3.2 < (f1+f3) / f2 < -2.0;

[0035] Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

[0036] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0037] 30.1 < |(V1-V2)| < 33.25;

[0038] Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0039] Optionally, the endoscope optical imaging lens further satisfies the following conditional expression:

[0040] 1.5 < (n1+n3) / n2 < 1.9;

[0041] Wherein, n1 is the maximum refractive index of the first lens, n2 is the maximum refractive index of the second lens, and n3 is the maximum refractive index of the third lens.

[0042] The application further provides an electronic device comprising the endoscope optical imaging lens according to any one of the above and an imaging element for converting an optical pattern formed by the endoscope optical imaging lens into an electrical signal.

[0043] Compared with the prior art, the application has the following beneficial effects:

[0044] The application provides an endoscope optical imaging lens and an electronic device, which are thin, small and short, can correct aberration well, have high pixels, high resolution and excellent imaging quality, and can meet the requirements of endoscopic applications. BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0046] Figure 1 A schematic diagram of an endoscope optical imaging lens according to an embodiment of the present application is shown;

[0047] Figure 2 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0048] Figure 3 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0049] Figure 4 A schematic diagram of an endoscope optical imaging lens according to an embodiment of the present application is shown;

[0050] Figure 5 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0051] Figure 6 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0052] Figure 7 A schematic diagram of an endoscope optical imaging lens according to an embodiment of the present application is shown;

[0053] Figure 8 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0054] Figure 9 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0055] Figure 10 A schematic diagram of an endoscope optical imaging lens according to an embodiment of the present application is shown;

[0056] Figure 11 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0057] Figure 12 The left-to-right sequence is the astigmatism and distortion curve diagram of an endoscope optical imaging lens according to an embodiment of the present application;

[0058] Figure 13A schematic view of an endoscope optical imaging lens according to the fifth embodiment of the present application is shown;

[0059] Figure 14 A curve graph of astigmatism and distortion of the endoscope optical imaging lens according to the fifth embodiment of the present application is shown from left to right.

[0060] Figure 15 A curve graph of spherical aberration of the endoscope optical imaging lens according to the fifth embodiment of the present application is shown.

[0061] In the above-mentioned figures: E1, first lens; E2, second lens; E3, third lens; E4, infrared filter; E5, protective glass; STO, stop; S1, object side of the first lens; S2, image side of the first lens; S3, object side of the second lens; S4, image side of the second lens; S5, object side of the third lens; S6, image side of the third lens; S7, imaging surface. DETAILED DESCRIPTION

[0062] In order to make the objectives, features and advantages of the present application more obvious and easy to understand, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the embodiments described below are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0063] It should be understood that, in the description of the present application, the specific embodiments are only used to explain the present application, rather than limit the present application. Among them, the exemplary embodiments are described as processes or methods depicted by flowcharts; although the flowcharts describe the operations or steps of the processes in a certain order, many of the operations or steps can be implemented in parallel, concurrently or simultaneously, and the order of the operations can be rearranged. When the operations or steps are completed, the corresponding processes can be terminated, and there can be additional steps not included in the drawings. The foregoing processes can correspond to methods, functions, procedures, subroutines, subprograms, etc., and the embodiments and features in the embodiments of the present application can be combined with each other without conflict.

[0064] The term "comprising" and its variants used in the present application are open and inclusive, i.e. "including but not limited to". The term "based on" is "at least partially based on". The technical solutions of the present application will be further described below with reference to the drawings and through specific embodiments; it can be understood that, for the convenience of description, only the parts related to the present application are shown in the drawings, rather than all the structures.

[0065] The present application provides an endoscope optical imaging lens, which is composed of a first lens, a second lens and a third lens arranged in sequence from the object side to the image side, wherein each surface from the object side surface of the first lens to the image side surface of the third lens is aspherical, and a diaphragm is arranged on the object side of the first lens.

[0066] The first lens has positive refractive power, the object side surface thereof is convex near the optical axis, and the image side surface thereof is convex near the optical axis.

[0067] The second lens has negative refractive power, the object side surface thereof is concave near the optical axis, and the image side surface thereof is convex near the optical axis.

[0068] The third lens has refractive power, the object side surface thereof is convex near the optical axis, and the image side surface thereof is convex near the optical axis.

[0069] In addition, the infrared filter in the endoscope optical imaging lens is arranged on the object side of the first lens, which filters out the infrared band light entering the lens through the infrared filter to avoid the generation of noise caused by the irradiation of infrared light on the photosensitive chip. Specifically, the infrared filter can be made of glass to avoid affecting the focal length. A protective glass is arranged between the third lens and the imaging surface to protect the lens.

[0070] The endoscope optical imaging lens satisfies the following condition formula: 0.023

[0071] The endoscope optical imaging lens satisfies the following condition formula: 0.4

[0072] The endoscope optical imaging lens also satisfies the following condition formula: 0.5

[0073] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 0.3 < SD31 / R31 < 2.0; wherein SD31 is the maximum effective radius of the object side surface of the third lens, and R31 is the curvature radius of the object side surface of the third lens. By the conditional expression, the shape and aperture size of the third lens are limited, so that the third lens is more miniaturized, thereby meeting the demand for small size of the lens.

[0074] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 0.32 < f3 / f < 1.2; wherein f3 is the focal length of the third lens, and f is the focal length of the endoscope optical imaging lens. Based on the relationship, the spherical aberration generated by other lenses can be further balanced, thereby further improving the imaging quality of the lens, thereby meeting the endoscope requirement.

[0075] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 1.0 < (f1+f3) / (ct1+ct3) < 3.2; wherein f1 is the focal length of the first lens, f3 is the focal length of the third lens, ct1 is the central thickness of the first lens, and ct3 is the central thickness of the third lens. By reasonably configuring the focal length and thickness of the first lens and the third lens, it is beneficial to ensure the imaging quality of the lens while making the lens have good space utilization, thereby being beneficial to realize the miniaturization of the lens.

[0076] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 0.15 < EPD / D32 < 0.65; wherein EPD is the entrance pupil diameter of the endoscope optical imaging lens, and D32 is the effective diameter of the image side surface of the third lens. By the foregoing relationship, the entrance pupil of the endoscope optical imaging lens has a larger value, thereby expanding the aperture, which is beneficial to improve the imaging quality while realizing the miniaturization of the lens.

[0077] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 0.8 ≤ ∑CT / ∑ET ≤ 1.9; wherein ∑CT is the sum of the distances between the center optical axes of the lenses, and ∑ET is the sum of the edge thicknesses of the lenses. By reasonably adjusting the distances between the center optical axes of the lenses and the edge thicknesses by the relationship, the manufacturing yield of the lenses is improved.

[0078] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 0.2 < f / TTL < 0.7; wherein f is the focal length of the endoscope optical imaging lens, and TTL is the total optical length of the endoscope optical imaging lens. By the foregoing relationship, the convergence effect of light on the imaging surface is ensured, and the clarity and integrity of the formed image are improved.

[0079] Further, the endoscope optical imaging lens also satisfies the following conditional expression: -3.2 < (f1+f3) / f2 < -2.0; wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens; by reasonably controlling the focal lengths of the first lens, the second lens and the third lens, the spherical aberration contribution of each lens is reasonably controlled, and then the imaging quality of the lens is improved.

[0080] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 30.1 < |(V1-V2)| < 33.25; wherein V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens. Through the relationship, the lens can obtain better resolution while effectively reducing the volume of the lens.

[0081] Further, the endoscope optical imaging lens also satisfies the following conditional expression: 1.5 < (n1+n3) / n2 < 1.9; wherein n1 is the maximum refractive index of the first lens, n2 is the maximum refractive index of the second lens, and n3 is the maximum refractive index of the third lens; the refractive index of each lens is specified, which is more conducive to the development of the endoscope optical imaging lens to ultra-thin, and is also conducive to correcting aberration.

[0082] Embodiment one

[0083] Please refer to Figures 1 to 3 , Figure 1 The figure shows a schematic diagram of an endoscope optical imaging lens according to the embodiment one of the present application, Figure 2 The figure shows a schematic diagram of an endoscope optical imaging lens according to the embodiment one of the present application, Figure 3 The figure shows a schematic diagram of an endoscope optical imaging lens according to the embodiment one of the present application.

[0084] The present application provides an endoscope optical imaging lens, which is composed of a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from the object side to the image side, wherein each surface of the object side surface S1 of the first lens E1 to the image side surface S6 of the third lens E3 is aspherical, and in addition, a diaphragm is arranged on the object side of the first lens E1.

[0085] The first lens E1 has positive refractive power, and the object side surface S1 is convex near the optical axis, and the image side surface S2 is convex near the optical axis;

[0086] The second lens E2 has negative refractive power, and the object side surface S3 is concave near the optical axis, and the image side surface S4 is convex near the optical axis;

[0087] The third lens E3 has positive refractive power, and the object side surface S5 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0088] In addition, the infrared filter E4 in the endoscope optical imaging lens is arranged on the object side of the first lens E1, and the infrared band light entering the lens is filtered out through the infrared filter E4 to avoid the infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter E4 can be made of glass to avoid affecting the focal length. The third lens E3 and the imaging surface S7 are provided with a protective glass E5 for protecting the lens.

[0089] Please refer to Table 1-1, Table 1-2 and Table 1-3 below.

[0090]

[0091]

[0092]

[0093] Table 1-1 is the detailed structure data of Example 1, wherein the units of the curvature radius, the thickness and the focal length are millimeters, f is the focal length of the endoscope optical imaging lens, Fno is the aperture value, and HFOV is half of the maximum field of view angle of the endoscope optical imaging lens.

[0094] Table 1-2 is the aspheric surface coefficient data in Example 1, wherein k represents the conic coefficient in the aspheric surface equation, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 represent the 4th, 6th, 8th, 10th, 12th, 14th, 16th, 18th and 20th order aspheric surface coefficients of each surface.

[0095] Table 1-3 is the conditions met by the endoscope optical imaging lens in Example 1.

[0096] In addition, the following example tables correspond to the schematic diagram and the curve graph of each example, and the definitions of the data in the tables are the same as those of Table 1-1, Table 1-2 and Table 1-3 of the first example, which will not be repeated here.

[0097] Example Two

[0098] Please refer to Figures 4 to 6 , Figure 4 The schematic diagram of an endoscope optical imaging lens according to Example Two of the present application is shown, Figure 5 The astigmatism and distortion curve graph of an endoscope optical imaging lens according to Example Two of the present application is shown from left to right, Figure 6 The spherical aberration curve graph of an endoscope optical imaging lens according to Example Two of the present application is shown.

[0099] The present application provides an endoscope optical imaging lens, which is composed of a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from an object side to an image side, wherein each surface of the object side surface S1 of the first lens E1 to the image side surface S6 of the third lens E3 is aspherical, and in addition, a diaphragm is arranged on the object side of the first lens E1.

[0100] The first lens E1 has positive refractive power, the object side surface S1 is convex near the optical axis, and the image side surface S2 is convex near the optical axis.

[0101] The second lens E2 has negative refractive power, the object side surface S3 is concave near the optical axis, and the image side surface S4 is convex near the optical axis.

[0102] The third lens E3 has positive refractive power, the object side surface S5 is convex near the optical axis, and the image side surface S6 is convex near the optical axis.

[0103] In addition, the infrared filter E4 in the endoscope optical imaging lens is arranged on the object side of the first lens E1, and the infrared band light entering the lens is filtered out through the infrared filter E4 to avoid the generation of noise caused by the irradiation of infrared light on the photosensitive chip. Specifically, the infrared filter E4 can be made of glass to avoid affecting the focal length. The protective glass E5 is arranged between the third lens E3 and the imaging surface S7 to protect the lens.

[0104] Please refer to Table 2-1, Table 2-2 and Table 2-3 below.

[0105]

[0106]

[0107]

[0108] Example Three

[0109] Please refer to Figures 7 to 9 , Figure 7 A schematic diagram of an endoscope optical imaging lens according to the third embodiment of the present application is shown, Figure 8 The left to right in sequence is the astigmatism and distortion curve of the endoscope optical imaging lens according to the third embodiment of the present application, Figure 9 The spherical aberration curve of the endoscope optical imaging lens according to the third embodiment of the present application.

[0110] The present application provides an endoscope optical imaging lens, which is composed of a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from an object side to an image side, wherein each surface of the object side surface S1 of the first lens E1 to the image side surface S6 of the third lens E3 is aspherical, and in addition, a diaphragm is arranged on the object side of the first lens E1.

[0111] The first lens E1 has positive refractive power, the object side surface S1 thereof is convex near the optical axis, and the image side surface S2 thereof is convex near the optical axis.

[0112] The second lens E2 has negative refractive power, the object side surface S3 thereof is concave near the optical axis, and the image side surface S4 thereof is convex near the optical axis.

[0113] The third lens E3 has positive refractive power, the object side surface S5 thereof is convex near the optical axis, and the image side surface S6 thereof is convex near the optical axis.

[0114] In addition, the infrared filter E4 in the endoscope optical imaging lens is arranged on the object side of the first lens E1, and the infrared waveband light entering the lens is filtered out through the infrared filter E4 to avoid the infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter E4 can be made of glass to avoid affecting the focal length. The protective glass E5 is arranged between the third lens E3 and the imaging surface S7 to protect the lens.

[0115] Please refer to Table 3-1, Table 3-2 and Table 3-3 below.

[0116]

[0117]

[0118]

[0119] Embodiment Four

[0120] Please refer to Figures 10 to 12 , Figure 10 a schematic diagram of an endoscope optical imaging lens according to Embodiment Four of the present application is shown, Figure 11 from left to right are the astigmatism and distortion curve diagrams of an endoscope optical imaging lens according to Embodiment Four of the present application, Figure 12 is the spherical aberration curve diagram of an endoscope optical imaging lens according to Embodiment Four of the present application.

[0121] The present application provides an endoscope optical imaging lens, which is composed of a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from the object side to the image side, and each surface among the object side surface S1 of the first lens E1 and the image side surface S6 of the third lens E3 is aspherical surface, in addition, an aperture stop is arranged on the object side of the first lens E1.

[0122] The first lens E1 has positive refractive power, the object side surface S1 thereof is convex near the optical axis, and the image side surface S2 thereof is convex near the optical axis.

[0123] The second lens E2 has negative refractive power, the object side surface S3 thereof is concave near the optical axis, and the image side surface S4 thereof is convex near the optical axis;

[0124] The third lens E3 has positive refractive power, the object side surface S5 thereof is convex near the optical axis, and the image side surface S6 thereof is convex near the optical axis.

[0125] In addition, the infrared filter E4 in the endoscope optical imaging lens is arranged on the object side of the first lens E1, and the infrared band light entering the lens is filtered through the infrared filter E4 to avoid the infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter E4 can be made of glass to avoid affecting the focal length. The protective glass E5 is arranged between the third lens E3 and the imaging surface S7 to protect the lens.

[0126] Please refer to Table 4-1, Table 4-2 and Table 4-3 below.

[0127]

[0128]

[0129]

[0130] Example Five

[0131] Please refer to Figures 13 to 15 , Figure 13 a schematic diagram of an endoscope optical imaging lens of the embodiment five of the present application is shown, Figure 14 the astigmatism and distortion curve diagram of the endoscope optical imaging lens of the embodiment five of the present application is shown from left to right in sequence, Figure 15 the spherical aberration curve diagram of the endoscope optical imaging lens of the embodiment five of the present application is shown.

[0132] The present application provides an endoscope optical imaging lens, which is composed of a first lens E1, a second lens E2 and a third lens E3 arranged in sequence from the object side to the image side, each surface among the object side surface S1 of the first lens E1 and the image side surface S6 of the third lens E3 is aspherical, and in addition, a diaphragm is arranged on the object side of the first lens E1.

[0133] The first lens E1 has positive refractive power, the object side surface S1 thereof is convex near the optical axis, and the image side surface S2 thereof is convex near the optical axis;

[0134] The second lens E2 has negative refractive power, the object side surface S3 thereof is concave near the optical axis, and the image side surface S4 thereof is convex near the optical axis;

[0135] The third lens E3 has positive refractive power, the object side surface S5 thereof is convex near the optical axis, and the image side surface S6 thereof is convex near the optical axis.

[0136] In addition, the infrared filter E4 in the endoscope optical imaging lens is arranged on the object side of the first lens E1, and the infrared band light entering the lens is filtered by the infrared filter E4 to avoid the infrared light from irradiating the photosensitive chip to generate noise. Specifically, the infrared filter E4 can be made of glass to avoid affecting the focal length. The protective glass E5 is arranged between the third lens E3 and the imaging surface S7 to protect the lens.

[0137] Please refer to Table 5-1, Table 5-2 and Table 5-3 below.

[0138]

[0139]

[0140]

[0141] Embodiment Six

[0142] Based on the foregoing embodiments, the embodiment of the present application provides an electronic device, which comprises the endoscope optical imaging lens provided in any of the foregoing embodiments, and an imaging element for converting the optical pattern formed by the endoscope optical imaging lens into an electrical signal.

[0143] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An endoscope optical imaging lens characterized by, Consist of first lens, second lens and third lens arranged in order from object side to image side, each surface from object side surface of the first lens to image side surface of the third lens is aspherical surface; The first lens has positive refractive power, its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis; The second lens has negative refractive power, its object side surface is concave near the optical axis, and its image side surface is convex near the optical axis; The third lens has refractive power, its object side surface is convex near the optical axis, and its image side surface is convex near the optical axis; And satisfy the following conditional expression: 0.023<SAG11 / SD11<0.08; 0.4<f1 / f<1.0; 0.5<R22 / f2<2.8; Wherein, SAG11 is the sagittal height of the object side surface of the first lens, SD11 is the maximum effective radius of the object side surface of the first lens, f is the focal length of the endoscope optical imaging lens, f1 is the focal length of the first lens, R22 is the curvature radius of the image side surface of the second lens, and f2 is the focal length of the second lens.

2. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 0.3<SD31 / R31<2.0: Wherein, SD31 is the maximum effective radius of the object side surface of the third lens, and R31 is the curvature radius of the object side surface of the third lens.

3. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 0.32<f3 / f<1.2; Wherein, f3 is the focal length of the third lens, and f is the focal length of the endoscope optical imaging lens.

4. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 1.0<(f1+f3) / (ct1+ct3)<3.2; Wherein, f1 is the focal length of the first lens, f3 is the focal length of the third lens, ct1 is the central thickness of the first lens, and ct3 is the central thickness of the third lens.

5. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 0.15<EPD / D32<0.65; Wherein, EPD is the entrance pupil diameter of the endoscope optical imaging lens, and D32 is the effective diameter of the image side surface of the third lens.

6. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 0.8≤∑CT / ∑ET≤1.9; Wherein, ∑CT is the sum of the distances of the central optical axes of the lenses, and ∑ET is the sum of the edge thicknesses of the lenses.

7. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 0.2<f / TTL<0.7; Wherein, f is the focal length of the endoscope optical imaging lens, and TTL is the total optical length of the endoscope optical imaging lens.

8. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: -3.2<(f1+f3) / f2<-2.0; Wherein, f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

9. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 30.1<|(V1-V2)|<33.25; Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

10. The endoscopic optical imaging lens of claim 1, wherein, The endoscope optical imaging lens also satisfies the following conditional expression: 1.5 < (n1+n3) / n2 < 1.9; wherein n1 is the maximum refractive index of the first lens, n2 is the maximum refractive index of the second lens, and n3 is the maximum refractive index of the third lens.

11. An electronic device, comprising: An imaging element for converting an optical pattern formed by the endoscope optical imaging lens into an electrical signal.

Images