Optical imaging device

Abstract

The utility model provides an optical imaging device. The optical imaging device sequentially comprises a first lens group, a second lens group and a third lens group from an object side to an image side along an optical axis, the first lens group comprises a first lens with positive focal power and a second lens with negative focal power; the second lens group comprises a third lens with negative focal power, and the image side surface of the third lens is a concave surface; the object side surface and the image side surface of the fourth lens are convex surfaces; the third lens group is movably arranged on the optical axis and comprises a fifth lens with negative focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface; the lenses have no inflection points; the combined focal length f34 of the second lens group and the distance TTL from the object side surface to the imaging surface of the first lens on the central optical axis satisfy 0.3 lt; f34 / TTL is less than or equal to 2.7. According to the optical imaging device provided by the utility model, the pick-up lens group can be kept miniaturized, and meanwhile, the pick-up lens group has relatively high aberration correction capability.

Description

Technical Field

[0001] The present application belongs to the field of optical devices, and in particular, relates to an optical imaging device. Background Art

[0002] In reality, in order to be able to clearly observe targets at different distances, optical instruments are generally required to have their own focusing function. The focusing of the optical system is divided into internal focusing and external focusing. The total length of the optical system with external focusing structure is generally long, the weight is heavy, and the focusing stroke is relatively large, which will cause large errors and jitters during the focusing process due to system instability. In addition, the external focusing optical system has a complex architecture and large chromatic aberration. The internal focusing optical system is to move a group of lenses in the optical system along the optical axis within a certain range, so that the effective focal length of the entire optical system changes continuously to achieve the purpose of focusing. It can be seen that the existing internal focusing optical system has the problems of short focal length and small adjustment range. Utility Model Content

[0003] In view of the above-mentioned deficiencies in the prior art, the utility model provides an optical imaging device, which can enable a camera lens group to have a higher aberration correction capability while maintaining miniaturization.

[0004] In order to achieve the above-mentioned object, the utility model provides an optical imaging device, which comprises, in order from the object side to the image side along the optical axis: a first lens group, a second lens group and a third lens group;

[0005] The first lens group includes, in order from the object side to the image side along the optical axis:

[0006] a first lens having positive optical power, wherein the image-side surface of the first lens is convex; and

[0007] a second lens having negative optical power;

[0008] The second lens group includes, in order from the object side to the image side along the optical axis:

[0009] a third lens having negative optical power, wherein the image side surface of the third lens is concave; and

[0010] a fourth lens having positive refractive power, wherein both the object-side surface and the image-side surface of the fourth lens are convex;

[0011] The third lens group is movably disposed on the optical axis, and the third lens group includes, in order from the object side to the image side along the optical axis:

[0012] a fifth lens having negative optical power, wherein the object-side surface of the fifth lens is convex and the image-side surface of the fifth lens is concave;

[0013] The lenses of the first lens group, the second lens group and the third lens group have no inflection points;

[0014] The combined focal length f34 of the second lens group and the distance TTL from the object side to the imaging surface of the first lens on the central optical axis satisfy: 0.3 <f34 / TTL≤2.7。

[0015] According to one embodiment of the present application, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 0.4 <f3 / f5<1.8。

[0016] According to one embodiment of the present application, a curvature radius R7 of the object-side surface of the fourth lens and a maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 2.0≤R7 / DT41<5.4.

[0017] According to one embodiment of the present application, a curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 1.7<(R9+R10) / (R9-R10)<2.0.

[0018] According to one embodiment of the present application, a center thickness CT3 of the third lens on the optical axis and an air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 1.0≤CT3 / T34<5.1.

[0019] According to one embodiment of the present application, the Abbe number V2 of the second lens and the Abbe number V3 of the third lens satisfy: 1.3 <V2 / V3<2.5。

[0020] According to one embodiment of the present application, the effective focal length f3 of the third lens, the refractive index N3 of the third lens, and the curvature radius R6 of the image side surface of the third lens satisfy: -7.5 <f3*N3 / R6<-0.9。

[0021] According to one embodiment of the present application, the on-axis distance TD from the object side of the first lens to the image side of the fifth lens and the distance TTL from the object side of the first lens on the central optical axis to the imaging surface satisfy: 1.9 <TTL / TD<2.9。

[0022] According to one embodiment of the present application, a stop is further included, and the stop is arranged on the optical axis; the axial distance TD from the object side surface of the first lens to the image side surface of the fifth lens and the distance SD from the stop to the image side surface of the fifth lens satisfy: 1.4 <TD / SD≤1.8。

[0023] According to one embodiment of the present application, the sum of the center thicknesses ∑CT of all lenses on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 1.3<∑CT / (T12+T23+T34)<7.2.

[0024] According to one embodiment of the present application, the effective focal length f of the optical imaging device, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy: <f / (f4+f5)<-1.4。

[0025] According to one embodiment of the present application, the combined focal length f12 of the first lens and the second lens, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy: 0.9<|f12 / (R2+R3)|<6.5.

[0026] According to one embodiment of the present application, the maximum distortion of the optical imaging device is less than 0.1%.

[0027] The utility model adopts the above technical solution, so that it has the following beneficial effects:

[0028] The lens structure scheme adopted in the utility model and the reasonable control of the ratio of the combined focal length f34 of the second lens group to the distance TTL from the object side to the imaging surface of the first lens on the central optical axis are beneficial to reducing the field of view sensitivity of the central area, so that the camera lens group can have a higher aberration correction ability while maintaining miniaturization and can obtain better processability. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 This is a schematic structural diagram of the optical imaging device of Embodiment 1 of the present utility model in the first state;

[0031] Figure 2 is an on-axis chromatic aberration curve diagram of the optical imaging device of Example 1 in the first state;

[0032] Figure 3 is a distortion curve diagram of the optical imaging device of Example 1 in the first state;

[0033] Figure 4 This is a schematic structural diagram of the optical imaging device of Embodiment 1 of the present utility model in the second state;

[0034] Figure 5 is an on-axis chromatic aberration curve diagram of the optical imaging device of Example 1 in the second state;

[0035] Figure 6 is a distortion curve diagram of the optical imaging device of Example 1 in the second state;

[0036] Figure 7 This is a schematic structural diagram of the optical imaging device of Embodiment 2 of the present utility model in the first state;

[0037] Figure 8 The axial chromatic aberration curve diagram of the optical imaging device of Example 2 in the first state;

[0038] Fig. 9 is a distortion curve diagram of the optical imaging device of Example 2 in the first state;

[0039] Fig.10 This is a schematic structural diagram of the optical imaging device of Embodiment 2 of the present utility model in the second state;

[0040] Fig.11 is an on-axis chromatic aberration curve diagram of the optical imaging device of Example 2 in the second state;

[0041] Fig.12 is a distortion curve diagram of the optical imaging device of Example 2 in the second state;

[0042] Fig.13 This is a schematic structural diagram of the optical imaging device of Embodiment 3 of the present utility model in the first state;

[0043] Fig.14 The axial chromatic aberration curve diagram of the optical imaging device of Example 3 in the first state;

[0044] Fig.15 is a distortion curve diagram of the optical imaging device of Example 3 in the first state;

[0045] Fig.16 This is a schematic structural diagram of the optical imaging device of Embodiment 3 of the present utility model in the second state;

[0046] Fig.17 The axial chromatic aberration curve diagram of the optical imaging device in the second state of the third embodiment;

[0047] Fig.18 is a distortion curve diagram of the optical imaging device of Example 3 in the second state;

[0048] Fig.19 This is a schematic structural diagram of an optical imaging device according to a fourth embodiment of the present utility model in a first state;

[0049] Fig. 20 The axial chromatic aberration curve diagram of the optical imaging device of Example 4 in the first state;

[0050] Fig.21 is a distortion curve diagram of the optical imaging device of Example 4 in the first state;

[0051] Fig. 22 This is a schematic structural diagram of the optical imaging device of Embodiment 4 of the present utility model in the second state;

[0052] Fig.23 The axial chromatic aberration curve diagram of the optical imaging device of Example 4 in the second state;

[0053] Fig.24 is a distortion curve diagram of the optical imaging device of Example 4 in the second state;

[0054] Fig.25 This is a schematic structural diagram of the optical imaging device of Embodiment 5 of the present utility model in the first state;

[0055] Fig.26 The axial chromatic aberration curve diagram of the optical imaging device of Example 5 in the first state;

[0056] Fig. 27 is a distortion curve diagram of the optical imaging device of Example 5 in the first state;

[0057] Fig.28 This is a schematic structural diagram of the optical imaging device of Embodiment 5 of the present utility model in the second state;

[0058] Fig.29 The axial chromatic aberration curve diagram of the optical imaging device of Example 5 in the second state;

[0059] Fig.30 It is a distortion curve diagram of the optical imaging device of Example 5 in the second state.

[0060] Description of Figure Numbers:

[0061] E1-first lens; S1-object side surface of the first lens; S2-image side surface of the first lens; E2-second lens; S3-object side surface of the second lens; S4-image side surface of the second lens; E3-third lens; S5-object side surface of the third lens; S6-image side surface of the third lens; E4-fourth lens; S7-object side surface of the fourth lens; S8-image side surface of the fourth lens; E5-fifth lens; S9-object side surface of the fifth lens; S10-image side surface of the fifth lens; S11-imaging surface. DETAILED DESCRIPTION

[0062] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0063] It should be noted that, in the present specification, the expressions first, second, third, etc. are only used to distinguish one feature from another feature, but do not mean any limitation to the features.

[0064] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0065] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal way unless explicitly defined in this article.

[0066] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0067] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closer to the object side is the object side surface of the lens, and the surface of each lens closer to the image side is called the image side surface of the lens. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the convexity and concavity are judged by the positive and negative values of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software). For the object side surface, when the R value is positive, it is judged as convex, and when the R value is negative, it is judged as concave; for the image side surface, when the R value is positive, it is judged as concave, and when the R value is negative, it is judged as convex.

[0068] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The features, principles, and other aspects of this application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0069] Exemplary Embodiment

[0070] Please refer to Figures 1 to 30 , an optical imaging device according to an exemplary embodiment of this application, sequentially includes, from the object side to the image side along the optical axis: a first lens group, a second lens group, and a third lens group; the first lens group sequentially includes, from the object side to the image side along the optical axis: a first lens E1 with positive optical power and a second lens E2 with negative optical power; the image side surface S2 of the first lens is convex; the second lens group sequentially includes, from the object side to the image side along the optical axis: a third lens E3 with negative optical power and a fourth lens E4 with positive optical power; the image side surface S6 of the third lens is concave; the object side surface S7 and the image side surface of the fourth lens are both convex; the third lens group is movably arranged on the optical axis, the distance between the third lens group and the second lens group is variable, and the third lens group sequentially includes, from the object side to the image side along the optical axis: a fifth lens E5 with negative optical power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave; there is no anaclastic point in the lenses of the first lens group, the second lens group, and the third lens group; the combined focal length f34 of the second lens group and the distance TTL from the object side surface of the first lens to the imaging surface on the central optical axis satisfy: 0.3 < f34 / TTL ≤ 2.7. Reasonably controlling the ratio of the combined focal length f34 of the second lens and the distance TTL from the object side surface of the first lens to the imaging surface on the central optical axis is beneficial to reducing the sensitivity of the central region of the field of view, and can enable the camera lens group to have a high aberration correction ability while maintaining miniaturization, and can obtain better processability.

[0071] In an exemplary embodiment, the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 0.4 < f3 / f5 < 1.8. By reasonably allocating the effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens, the deflection angle of the incident light is reduced, and the lens sensitivity is decreased. At the same time, the surface tilt angle is prevented from being too large, thereby ensuring good processability and machinability of the third lens E3 and the fifth lens E5.

[0072] In an exemplary embodiment, the radius of curvature R7 of the object side surface S7 of the fourth lens and the maximum effective radius DT41 of the object side surface S7 of the fourth lens satisfy: 2.0 ≤ R7 / DT41 < 5.4. By reasonably controlling the ratio of the radius of curvature R7 of the object side surface S7 of the fourth lens to the maximum effective radius DT41 of the object side surface S7 of the fourth lens, it is beneficial to ensure the processing, shaping, and assembly of the fourth lens E4, so as to obtain good imaging quality.

[0073] In an exemplary embodiment, the radius of curvature R9 of the object side surface S9 of the fifth lens and the radius of curvature R10 of the image side surface S10 of the fifth lens satisfy: 1.7 < (R9 + R10) / (R9 - R10) < 2.0. The fifth lens E5 is a negative lens. By reasonably allocating the radius of curvature R9 of the object side surface S9 of the fifth lens and the radius of curvature R10 of the image side surface S10 of the fifth lens, the light is further smoothed, the light deflection angle is reduced, and various aberrations such as spherical aberration, coma, and astigmatism are balanced.

[0074] In an exemplary embodiment, the central thickness CT3 of the third lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.0 ≤ CT3 / T34 < 5.1. By satisfying the above conditions and reasonably controlling the central thickness CT3 of the third lens on the optical axis and the air gap T34 between the third lens and the fourth lens on the optical axis, not only can the total length of the optical system be effectively reduced to ensure the thinness and lightness of the lens, but also the processing sensitivity of the optical system can be decreased.

[0075] In an exemplary embodiment, the Abbe number V2 of the second lens and the Abbe number V3 of the third lens satisfy: 1.3 < V2 / V3 < 2.5. By reasonably configuring the materials of the second lens E2 and the third lens E3, on the one hand, the system chromatic aberration can be better corrected to avoid problems such as purple fringing during shooting; on the other hand, costs can be better saved.

[0076] In an exemplary embodiment, the effective focal length f3 of the third lens, the refractive index N3 of the third lens, and the radius of curvature R6 of the image side surface S6 of the third lens satisfy: -7.5 < f3 * N3 / R6 < -0.9. Such a setting can, on the one hand, avoid excessive difference in the optical power between the lens of the third lens E3 and others, ensuring the stability of assembly; on the other hand, it can reasonably limit the range of incident light, eliminate the light with poor edge quality, reduce off-axis aberration, and effectively improve the resolution of the lens group.

[0077] In an exemplary embodiment, the on-axis distance TD from the object side surface S1 of the first lens to the image side surface S10 of the fifth lens and the distance TTL from the object side surface of the first lens on the central optical axis to the imaging surface satisfy: 1.9 < TTL / TD < 2.9. Reasonably allocating the total length of the system and the on-axis distance from the object side surface S1 of the first lens to the image side surface S10 of the fifth lens can not only ensure the processing and assembly processability of the system but also ensure that the lens has a smaller size.

[0078] In an exemplary embodiment, a diaphragm is further included, and the diaphragm is disposed on the optical axis; the on-axis distance TD from the object side surface S1 of the first lens to the image side surface S10 of the fifth lens and the distance SD from the diaphragm to the image side surface S10 of the fifth lens satisfy: 1.4 < TD / SD ≤ 1.8. This ratio can reasonably design the position of the diaphragm, ensure that the aperture of the lens closer to the diaphragm is smaller, which is beneficial to actual processing and assembly. In addition, it can ensure that the trend between the lenses is relatively more reasonable, which is beneficial to the structural layout design.

[0079] In an exemplary embodiment, the sum ∑CT of the central thicknesses of all the lenses on the optical axis, the air gap T12 between the first lens and the second lens on the optical axis, the air gap T23 between the second lens and the third lens on the optical axis, and the air gap T34 between the third lens and the fourth lens on the optical axis satisfy: 1.3 < ∑CT / (T12 + T23 + T34) < 7.2. Reasonably controlling the ratio of the sum of the central thicknesses of all the lenses on the optical axis to the sum of the air gaps from the first lens to the fourth lens can not only avoid the problems of the lens being too thin or too thick (a too thin lens has poor strength, is easy to deform during assembly, and has great challenges in the forming process, while a too thick lens has uneven stress), but also the reasonable thickness distribution can effectively balance the field curvature of the optical system and improve the image quality.

[0080] In an exemplary embodiment, the effective focal length f of the optical imaging device, the effective focal length f4 of the fourth lens, and the effective focal length f5 of the fifth lens satisfy: -4 < f / (f4 + f5) < -1.4. Reasonably allocating the ratio range of the sum of the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens to the effective focal length f of the optical imaging device is beneficial to the balance of aberrations such as field curvature, astigmatism, and spherical aberration of the system, improving the imaging quality of the optical system and synchronously improving the macro MTF performance. On the other hand, it is beneficial to the balance of the temperature drift sensitivity of the entire system, avoiding the problem of blurred images caused by large MTF variations when the actual lens is used at different temperatures.

[0081] In an exemplary embodiment, the combined focal length f12 of the first lens and the second lens, the radius of curvature R2 of the image side S2 of the first lens, and the radius of curvature R3 of the object side S3 of the second lens satisfy: 0.9 < |f12 / (R2 + R3)| < 6.5. Reasonably controlling the radius of curvature R2 of the image side S2 of the first lens and the radius of curvature R3 of the object side S3 of the second lens is beneficial to the correction of spherical aberration and reduces the sensitivity of the central region of the field of view. When the ratio is too large, the degree of convergence of the incident light by the image side S2 of the first lens decreases, and the imaging quality deteriorates.

[0082] In an exemplary embodiment, the maximum distortion of the optical imaging device is less than 0.1%. The system of this embodiment is a small field of view imaging system. Controlling the maximum distortion can ensure the similarity between the imaging and the original object to the greatest extent.

[0083] The following further describes a specific embodiment of an optical imaging device applicable to the above embodiment with reference to the accompanying drawings. Specific Embodiment 1

[0085] Figure 1 This is a schematic structural diagram of Embodiment 1 of an optical imaging device of the present application when the light source is at a distance of 400 mm. Figure 4 This is a schematic structural diagram of Embodiment 1 of an optical imaging device of the present application when the light source is at an infinite distance.

[0086] Please refer to Figure 1 to Figure 6, an optical imaging device, comprising: a first lens group, a second lens group and a third lens group in order from the object side to the image side along the optical axis; the first lens group comprises: a first lens E1 with positive focal power and a second lens E2 with negative focal power in order from the object side to the image side along the optical axis; the image side surface S2 of the first lens is convex; the second lens group comprises: a third lens E3 with negative focal power and a fourth lens E4 with positive focal power in order from the object side to the image side along the optical axis; the image side surface S6 of the third lens is concave; the object side surface S7 and the image side surface of the fourth lens are both convex; the third lens group is movably arranged on the optical axis, and the third lens group comprises: a fifth lens E5 with negative focal power in order from the object side to the image side along the optical axis, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave; the lenses of the first lens group, the second lens group and the third lens group have no inflection points; the maximum distortion of the optical imaging device is less than 0.1%.

[0087] Among them, the first lens E1 has positive focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has negative focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0088] Table 1 is a basic parameter table of the optical imaging lens of Example 1, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0089]

[0090] Table 1

[0091] Table 2 is a table of parameters that change in different states of Example 1, wherein the units of the effective focal length f of the optical imaging device, the entrance pupil diameter EPD, the air gap T45 and T between the fourth lens and the fifth lens on the optical axis are all millimeters (mm).

[0092] W First State Second State OBJ(mm) 400(M) Infinity (IN) f / EPD 3.37 4.47 f(mm) 84.31 111.87 T45(mm) 33.04 14.95 T(mm) 54.99 73.09

[0093] Table 2

[0094] Table 3 is an optical parameter table of Example 1, wherein the units of the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the distance TTL from the object side surface of the first lens on the central optical axis to the imaging surface, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the maximum effective radius DT41 of the object side surface S7 of the fourth lens are all millimeters (mm).

[0095] Example Data 1 f1 348.02 f2 -2651.10 f3 -85.12 f4 40.72 f5 -95.80 TTL 153.70 f12 480.84 f34 85.79 DT41 16.74

[0096] Table 3

[0097] The optical imaging device in Example 1 satisfies:

[0098] f34 / TTL=0.56;0.3 <f34 / TTL≤2.7。

[0099] f3 / f5=0.89;0.4 <f3 / f5<1.8;

[0100] R7 / DT41=2;2.0≤R7 / DT41<5.4;

[0101] (R9+R10) / (R9-R10)=1.96; 1.7<(R9+R10) / (R9-R10)<2.0;

[0102] CT3 / T34=5.07; 1.0≤CT3 / T34<5.1;

[0103] V2 / V3=2.2;1.3 <V2 / V3<2.5;

[0104] f3*N3 / R6=-5.15;-7.5 <f3*N3 / R6<-0.9;

[0105] TTL / TD=2.76;1.9 <TTL / TD<2.9;

[0106] TD / SD=1.79;1.4 <TD / SD≤1.8;

[0107] ∑CT / (T12+T23+T34)=3.2; 1.3<∑CT / (T12+T23+T34)<7.2;

[0108] f / (f4+f5)=-1.53;-4 <f / (f4+f5)<-1.4;

[0109] |f12 / (R2+R3)|=4.61; 0.9<|f12 / (R2+R3)|<6.5.

[0110] Figure 2 and Figure 5 The axial chromatic aberration curves of the optical imaging device of Example 1 at a light source distance of 400 mm and infinity are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Figure 3 , Figure 6 The distortion curves of the optical imaging device of Example 1 at a light source distance of 400 mm and at infinity are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 2 , Figure 3 , Figure 5 and Figure 6 It can be seen that the optical imaging device provided in Example 1 can achieve good imaging quality in all states. Specific embodiment 2

[0112] Figure 7 This is a structural schematic diagram of an optical imaging device embodiment 2 of the present application at a light source distance of 400 mm; Fig.10 This is a structural schematic diagram of an optical imaging device embodiment 2 of the present application, in which the light source distance is infinite.

[0113] See also Figure 7 to Figure 12 The structure of an optical imaging device in Example 2 of the present application is basically the same as that in Example 1, except that the parameters of each lens are different.

[0114] Among them, the first lens E1 has positive focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has negative focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0115] Table 4 is a basic parameter table of the optical imaging lens of Example 2, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0116]

[0117] Table 4

[0118] Table 5 is a table of parameters that change in different states of Example 2, wherein the units of the effective focal length f of the optical imaging device, the entrance pupil diameter EPD, the air gap T45 and T between the fourth lens and the fifth lens on the optical axis are all millimeters (mm).

[0119]

[0120]

[0121] Table 5

[0122] Table 6 is an optical parameter table of Example 2, wherein the units of the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the distance TTL from the object side surface of the first lens on the central optical axis to the imaging surface, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the maximum effective radius DT41 of the object side surface S7 of the fourth lens are all millimeters (mm).

[0123] Example Data 2 f1 287.94 f2 -238.84 f3 -112.05 f4 38.10 f5 -88.07 TTL 159.26 f12 -891.32 f34 56.06 DT41 18.25

[0124] Table 6

[0125] The optical imaging device in Example 2 satisfies:

[0126] f34 / TTL=0.35;0.3 <f34 / TTL≤2.7。

[0127] f3 / f5=1.27;0.4 <f3 / f5<1.8;

[0128] R7 / DT41=2.76; 2.0≤R7 / DT41<5.4;

[0129] (R9+R10) / (R9-R10)=1.83; 1.7<(R9+R10) / (R9-R10)<2.0;

[0130] CT3 / T34=1;1.0≤CT3 / T34<5.1;

[0131] V2 / V3=2.47;1.3 <V2 / V3<2.5;

[0132] f3*N3 / R6=-7.48;-7.5 <f3*N3 / R6<-0.9;

[0133] TTL / TD=2.15;1.9 <TTL / TD<2.9;

[0134] TD / SD=1.66;1.4 <TD / SD≤1.8;

[0135] ∑CT / (T12+T23+T34)=2.5; 1.3<∑CT / (T12+T23+T34)<7.2;

[0136] f / (f4+f5)=-1.45;-4 <f / (f4+f5)<-1.4;

[0137] |f12 / (R2+R3)|=6.41; 0.9<|f12 / (R2+R3)|<6.5.

[0138] Figure 8 and Fig.11 The axial chromatic aberration curves of the optical imaging device of Example 2 at a light source distance of 400 mm and infinity are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 9 , Fig.12 The distortion curves of the optical imaging device of Example 2 at a light source distance of 400 mm and at infinity are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. Figure 8 , Fig. 9 , Fig.11 and Fig.12 It can be seen that the optical imaging device provided in Example 2 can achieve good imaging quality in all states. Specific embodiment 3

[0140] Fig.13 This is a structural schematic diagram of an optical imaging device embodiment 3 of the present application at a light source distance of 400 mm; Fig.16 This is a structural schematic diagram of an optical imaging device embodiment 3 of the present application, in which the light source distance is infinite.

[0141] See also Figure 13 to Figure 18 The structure of an optical imaging device in Example 3 of the present application is basically the same as that in Example 1, except that the parameters of each lens are different.

[0142] Among them, the first lens E1 has positive focal power, the object side surface S1 of the first lens is concave, and the image side surface S2 of the first lens is convex. The second lens E2 has negative focal power, the object side surface S3 of the second lens is concave, and the image side surface S4 of the second lens is convex. The third lens E3 has negative focal power, the object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0143] Table 7 is a basic parameter table of the optical imaging lens of Example 3, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0144]

[0145] Table 7

[0146] Table 8 is a table of parameters that change in different states of Example 3, wherein the units of the effective focal length f of the optical imaging device, the entrance pupil diameter EPD, the air gap T45 and T between the fourth lens and the fifth lens on the optical axis are all millimeters (mm).

[0147] W First State Second State OBJ(mm) 400(M) Infinity (IN) f / EPD 3.63 5.24 f(mm) 90.70 130.90 T45(mm) 28.79 14.43 T(mm) 55.00 69.36

[0148] Table 8

[0149] Table 9 is an optical parameter table of Example 3, wherein the units of the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the distance TTL from the object side of the first lens on the central optical axis to the imaging plane, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the maximum effective radius DT41 of the object side S7 of the fourth lens are all millimeters (mm).

[0150] Example Data 3 f1 223.65 f2 -354.77 f3 -113.58 f4 42.48 f5 -65.55 TTL 188.69 f12 713.26 f34 69.13 DT41 15.59

[0151] Table 9

[0152] The optical imaging device in Example 3 satisfies:

[0153] f34 / TTL=0.37;0.3 <f34 / TTL≤2.7。

[0154] f3 / f5=1.73;0.4 <f3 / f5<1.8;

[0155] R7 / DT41=2.69; 2.0≤R7 / DT41<5.4;

[0156] (R9+R10) / (R9-R10)=1.86; 1.7<(R9+R10) / (R9-R10)<2.0;

[0157] CT3 / T34=1.37; 1.0≤CT3 / T34<5.1;

[0158] V2 / V3=1.31;1.3 <V2 / V3<2.5;

[0159] f3*N3 / R6=-7.22;-7.5 <f3*N3 / R6<-0.9;

[0160] TTL / TD=1.99;1.9 <TTL / TD<2.9;

[0161] TD / SD=1.46;1.4 <TD / SD≤1.8;

[0162] ∑CT / (T12+T23+T34)=1.34; 1.3<∑CT / (T12+T23+T34)<7.2;

[0163] f / (f4+f5)=-3.93;-4 <f / (f4+f5)<-1.4;

[0164] |f12 / (R2+R3)|=3.4; 0.9<|f12 / (R2+R3)|<6.5.

[0165] Fig.14 and Fig.17 The axial chromatic aberration curves of the optical imaging device of Example 3 at a light source distance of 400 mm and infinity are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig.15 , Fig.18 The distortion curves of the optical imaging device of Example 3 at a light source distance of 400 mm and at infinity are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.14 , Fig.15 , Fig.17 and Fig.18 It can be seen that the optical imaging device provided in Example 3 can achieve good imaging quality in all states. Specific embodiment 4

[0167] Fig.19 This is a schematic diagram of the structure of an optical imaging device embodiment 4 of the present application at a light source distance of 400 mm; Fig. 22This is a structural schematic diagram of an optical imaging device embodiment 4 of the present application, in which the light source distance is infinite.

[0168] See also Figure 19 to Figure 24 The structure of an optical imaging device in Example 4 of the present application is basically the same as that in Example 1, except that the parameters of each lens are different.

[0169] Among them, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0170] Table 10 is a basic parameter table of the optical imaging lens of Example 4, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0171]

[0172] Table 10

[0173] Table 11 is a table of parameters that change in different states of Example 4, wherein the units of the effective focal length f of the optical imaging device, the entrance pupil diameter EPD, the air gap T45 and T between the fourth lens and the fifth lens on the optical axis are all millimeters (mm).

[0174] W First State Second State OBJ(mm) 400(M) Infinity (IN) f / EPD 2.72 4.52 f(mm) 95.27 159.19 T45(mm) 42.01 18.13 T(mm) 55.00 78.88

[0175] Table 11

[0176] Table 12 is an optical parameter table of Example 4, wherein the units of the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the distance TTL from the object side surface of the first lens on the central optical axis to the imaging surface, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens, and the maximum effective radius DT41 of the object side surface S7 of the fourth lens are all millimeters (mm).

[0177]

[0178]

[0179] Table 12

[0180] The optical imaging device in Example 4 satisfies:

[0181] f34 / TTL=2.7;0.3 <f34 / TTL≤2.7。

[0182] f3 / f5=0.43;0.4 <f3 / f5<1.8;

[0183] R7 / DT41=5.36; 2.0≤R7 / DT41<5.4;

[0184] (R9+R10) / (R9-R10)=1.83; 1.7<(R9+R10) / (R9-R10)<2.0;

[0185] CT3 / T34=2.41; 1.0≤CT3 / T34<5.1;

[0186] V2 / V3=1.95;1.3 <V2 / V3<2.5;

[0187] f3*N3 / R6=-0.97;-7.5 <f3*N3 / R6<-0.9;

[0188] TTL / TD=2.83;1.9 <TTL / TD<2.9;

[0189] TD / SD=1.8;1.4 <TD / SD≤1.8;

[0190] ∑CT / (T12+T23+T34)=7.11; 1.3<∑CT / (T12+T23+T34)<7.2;

[0191] f / (f4+f5)=-2.89;-4 <f / (f4+f5)<-1.4;

[0192] |f12 / (R2+R3)|=0.95; 0.9<|f12 / (R2+R3)|<6.5.

[0193] Fig. 20 and Fig.23 The axial chromatic aberration curves of the optical imaging device of Example 4 at a light source distance of 400 mm and infinity are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig.21 , Fig.24 The distortion curves of the optical imaging device of Example 4 at a light source distance of 400 mm and at infinity are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. Fig. 20 , Fig.21 , Fig.23and Fig.24 It can be seen that the optical imaging device provided in Example 4 can achieve good imaging quality in all states. Specific embodiment 5

[0195] Fig.25 This is a structural schematic diagram of an optical imaging device embodiment 5 of the present application at a light source distance of 400 mm; Fig.28 This is a structural schematic diagram of an optical imaging device embodiment 4 of the present application, in which the light source distance is infinite.

[0196] See also Figure 25 to Figure 30 The structure of an optical imaging device in Example 5 of the present application is basically the same as that in Example 1, except that the parameters of each lens are different.

[0197] Among them, the first lens E1 has positive focal power, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is convex. The second lens E2 has negative focal power, the object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is concave. The third lens E3 has negative focal power, the object side surface S5 of the third lens is concave, and the image side surface S6 of the third lens is concave. The fourth lens E4 has positive focal power, the object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The fifth lens E5 has negative focal power, the object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave. The light from the object passes through each surface S1 to S10 in sequence and is finally imaged on the imaging surface S11.

[0198] Table 13 is a basic parameter table of the optical imaging lens of Example 5, wherein the units of the radius of curvature and thickness are both millimeters (mm).

[0199]

[0200] Table 13

[0201] Table 14 is a table of parameters that change in different states of Example 5, wherein the units of the effective focal length f of the optical imaging device, the entrance pupil diameter EPD, the air gap T45 and T between the fourth lens and the fifth lens on the optical axis are all millimeters (mm).

[0202] W First State Second State OBJ(mm) 400(M) Infinity (IN) f / EPD 2.74 4.57 f(mm) 95.89 160.41 T45(mm) 42.01 18.32 T(mm) 55.00 78.69

[0203] Table 14

[0204] Table 15 is an optical parameter table of Example 5, wherein the units of the effective focal length f1 of the first lens, the effective focal length f2 of the second lens, the effective focal length f3 of the third lens, the effective focal length f4 of the fourth lens, the effective focal length f5 of the fifth lens, the distance TTL from the object side of the first lens on the central optical axis to the imaging plane, the combined focal length f12 of the first lens and the second lens, the combined focal length f34 of the third lens and the fourth lens and the maximum effective radius DT41 of the object side S7 of the fourth lens are all millimeters (mm).

[0205] Example Data 5 f1 142.47 f2 110.70 f3 -29.80 f4 39.32 f5 -72.70 TTL 168.01 f12 62.67 f34 363.66 DT41 18.06

[0206] Table 15

[0207] The optical imaging device in Example 5 satisfies:

[0208] f34 / TTL=2.16;0.3 <f34 / TTL≤2.7。

[0209] f3 / f5=0.41;0.4 <f3 / f5<1.8;

[0210] R7 / DT41=5.05; 2.0≤R7 / DT41<5.4;

[0211] (R9+R10) / (R9-R10)=1.76; 1.7<(R9+R10) / (R9-R10)<2.0;

[0212] CT3 / T34=2;1.0≤CT3 / T34<5.1;

[0213] V2 / V3=1.95;1.3 <V2 / V3<2.5;

[0214] f3*N3 / R6=-1.01;-7.5 <f3*N3 / R6<-0.9;

[0215] TTL / TD=2.75;1.9 <TTL / TD<2.9;

[0216] TD / SD=1.79;1.4 <TD / SD≤1.8;

[0217] ∑CT / (T12+T23+T34)=5.45; 1.3<∑CT / (T12+T23+T34)<7.2;

[0218] f / (f4+f5)=-2.87;-4 <f / (f4+f5)<-1.4;

[0219] |f12 / (R2+R3)|=0.94; 0.9<|f12 / (R2+R3)|<6.5.

[0220] Fig.26 and Fig.29 The axial chromatic aberration curves of the optical imaging device of Example 5 at a light source distance of 400 mm and infinity are respectively shown, which indicate that light rays of different wavelengths deviate from the focal point behind the lens. Fig. 27 , Fig.30 The distortion curves of the optical imaging device of Example 5 at a light source distance of 400 mm and at infinity are shown respectively, which represent the distortion magnitude values ​​corresponding to different image heights. Fig.26 , Fig. 27 , Fig.29 and Fig.30 It can be seen that the optical imaging device provided in Example 5 can achieve good imaging quality in all states.

[0221] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, improvements, equivalent substitutions, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An optical imaging device, characterized in that: The lens comprises, in order from the object side to the image side along the optical axis: a first lens group, a second lens group and a third lens group; The first lens group includes, in order from the object side to the image side along the optical axis: a first lens having positive optical power, wherein the image-side surface of the first lens is convex; and a second lens having negative optical power; The second lens group includes, in order from the object side to the image side along the optical axis: a third lens having negative optical power, wherein the image side surface of the third lens is concave; and a fourth lens having positive refractive power, wherein both the object-side surface and the image-side surface of the fourth lens are convex; The third lens group is movably disposed on the optical axis, and the third lens group includes, in order from the object side to the image side along the optical axis: a fifth lens having negative optical power, wherein the object-side surface of the fifth lens is convex and the image-side surface of the fifth lens is concave; The lenses of the first lens group, the second lens group and the third lens group have no inflection points; The combined focal length f34 of the second lens group and the distance TTL from the object side to the imaging surface of the first lens on the central optical axis satisfy: 0.3 <f34 / TTL≤2.7。 2. The optical imaging device according to claim 1, characterized in that: The effective focal length f3 of the third lens and the effective focal length f5 of the fifth lens satisfy: 0.4 <f3 / f5<1.8。 3. The optical imaging device according to claim 1, characterized in that: A curvature radius R7 of the object-side surface of the fourth lens and a maximum effective radius DT41 of the object-side surface of the fourth lens satisfy: 2.0≤R7 / DT41<5.

4.

4. The optical imaging device according to claim 1, characterized in that: A curvature radius R9 of the object-side surface of the fifth lens and a curvature radius R10 of the image-side surface of the fifth lens satisfy: 1.7<(R9+R10) / (R9-R10)<2.

0.

5. The optical imaging device according to claim 1, characterized in that: A center thickness CT3 of the third lens on the optical axis and an air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 1.0≤CT3 / T34<5.

1.

6. The optical imaging device according to claim 1, characterized in that: The Abbe number V2 of the second lens and the Abbe number V3 of the third lens satisfy: 1.3 <V2 / V3<2.5。 7. The optical imaging device according to claim 1, characterized in that: The effective focal length f3 of the third lens, the refractive index N3 of the third lens and the curvature radius R6 of the image side surface of the third lens satisfy: -7.5 <f3*N3 / R6<-0.9。 8. The optical imaging device according to claim 1, characterized in that: The axial distance TD from the object side of the first lens to the image side of the fifth lens and the distance TTL from the object side of the first lens on the central optical axis to the imaging surface satisfy: 1.9 <TTL / TD<2.9。 9. The optical imaging device according to claim 1, characterized in that: It also includes a stop, which is arranged on the optical axis; the axial distance TD from the object side of the first lens to the image side of the fifth lens and the distance SD from the stop to the image side of the fifth lens satisfy: 1.4 <TD / SD≤1.8。 10. The optical imaging device according to claim 1, characterized in that: The sum ∑CT of the center thicknesses of all lenses on the optical axis, the air interval T12 between the first lens and the second lens on the optical axis, the air interval T23 between the second lens and the third lens on the optical axis, and the air interval T34 between the third lens and the fourth lens on the optical axis satisfy: 1.3<∑CT / (T12+T23+T34)<7.

2.

11. The optical imaging device according to claim 1, characterized in that: The effective focal length f of the optical imaging device, the effective focal length f4 of the fourth lens and the effective focal length f5 of the fifth lens satisfy: <f / (f4+f5)<-1.4。 12. The optical imaging device according to claim 1, characterized in that: The combined focal length f12 of the first lens and the second lens, the curvature radius R2 of the image side surface of the first lens, and the curvature radius R3 of the object side surface of the second lens satisfy: 0.9<|f12 / (R2+R3)|<6.

5.

13. The optical imaging device according to claim 1, characterized in that: The maximum distortion of the optical imaging device is less than 0.1%.

Images