Optical photographic lens

Abstract

The utility model discloses an optical photographic lens, which comprises a lens barrel, an optical lens group and a spacing element group, wherein the optical lens group and the spacing element group are arranged in the lens barrel; the optical lens group sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens from the object side to the image side along the optical axis. The spacing element group comprises a second spacing element which is arranged on the image side surface of the second lens and is in contact with the image side surface of the second lens, and a third spacing element which is arranged on the image side surface of the third lens and is in contact with the image side surface of the third lens; the number of the lenses with the focal power of the optical photographic lens is seven. The curvature radius R5 of the object side surface of the third lens, the refractive index N3 of the third lens and the inner diameter d2m of the image side surface of the second spacing element meet the following condition:-5.9 < R5 * N3 / d2m <-5.6; and the effective focal length f3 of the third lens and the distance EP23 between the second spacing element and the third spacing element along the optical axis meet the condition that f3 / EP23 is more than-20.1 and less than or equal to-14.5.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an optical photographic lens. Background Art

[0002] In recent years, with the increasing changes in consumer demands, the requirements for optical photographic lenses have gradually become more complex and diverse. In different application scenarios, the performance of optical photographic lenses varies.

[0003] Seven-element optical photographic lenses have become the mainstream and are widely used in fields such as mobile phones, virtual reality technology, augmented reality technology, and machine vision technology. The front lens has a greater impact on the overall imaging of the seven-element optical photographic lens. For example, the third lens is more sensitive, and light is easily refracted inside the third lens, resulting in more stray light in the optical camera lens, seriously affecting the imaging quality of the optical camera lens. Summary of the Utility Model

[0004] On the one hand, this application provides such an optical photographic lens, which includes a lens barrel, an optical lens group, and a spacer element group disposed within the lens barrel; the optical lens group includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. The spacer element group includes a second spacer element disposed on and in contact with the image side of the second lens, and a third spacer element disposed on and in contact with the image side of the third lens. Among them, the number of lenses with optical power in the optical photographic lens is seven. The radius of curvature R5 of the object side of the third lens, the refractive index N3 of the third lens, and the inner diameter d2m of the image side of the second spacer element satisfy: -5.9 < R5×N3 / d2m < -5.6; the effective focal length f3 of the third lens and the distance EP23 between the second spacer element and the third spacer element along the optical axis satisfy: -20.1 < f3 / EP23 ≤ -14.5.

[0005] According to an exemplary embodiment of the present application, the spacer element group further includes a sixth spacer element disposed on and in contact with the image side of the sixth lens; the radius of curvature R13 of the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer element satisfy: 0.7 < R13 / d6m < 1.5.

[0006] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side of the first lens; the inner diameter d2s of the object side of the second spacer element, the inner diameter d1m of the image side of the first spacer element, the radius of curvature R2 of the image side of the first lens, and the effective focal length f1 of the first lens satisfy: -5.2 ≤ R2×(d2s - d1m) / f1 < -1.7.

[0007] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens and a fifth spacer element disposed on and in contact with the image side surface of the fifth lens; the combined focal length f45 of the fourth lens and the fifth lens, the distance EP45 along the optical axis between the fourth spacer element and the fifth spacer element, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 5.0 ≤ f45 / (EP45 + T45) ≤ 8.84.

[0008] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens; the distance EP12 along the optical axis between the first spacer element and the second spacer element and the effective focal length f2 of the second lens satisfy: -54.0 < f2 / EP12 ≤ -22.48.

[0009] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens; the effective focal length f4 of the fourth lens, the distance EP34 along the optical axis between the third spacer element and the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 8.25 < f4 / (EP34 + CT4) < 10.2.

[0010] According to an exemplary embodiment of the present application, the spacer element group further includes a fourth spacer element disposed on and in contact with the image side surface of the fourth lens and a fifth spacer element disposed on and in contact with the image side surface of the fifth lens; the radius of curvature R10 of the image side surface of the fifth lens, the outer diameter D5s of the object side surface of the fifth spacer element, and the outer diameter D4m of the image side surface of the fourth spacer element satisfy: 4.7 ≤ R10 / (D5s - D4m) < 15.3.

[0011] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens and a sixth spacer element disposed on and in contact with the image side surface of the sixth lens; the distance EP56 along the optical axis between the fifth spacer element and the sixth spacer element and the central thickness CT6 of the sixth lens on the optical axis satisfy: 1.25 < EP56 / CT6 < 2.95.

[0012] According to an exemplary embodiment of the present application, the spacer element group further includes a first spacer element disposed on and in contact with the image side surface of the first lens; the radius of curvature R3 of the object side surface of the second lens, the inner diameter d1s of the object side surface of the first spacer element, the radius of curvature R4 of the image side surface of the second lens, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 1.45 < (R3 × d1s) / (R4 × d2m) < 1.75.

[0013] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens and a sixth spacer element disposed on and in contact with the image side surface of the sixth lens; the radius of curvature R11 of the object side surface of the sixth lens, the refractive index N6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, and the outer diameter D5m of the image side surface of the fifth spacer element satisfy: 2.5 ≤ R11 × N6 / (D6s - D5m) < 4.6.

[0014] According to an exemplary embodiment of the present application, the spacer element group further includes a fifth spacer element disposed on and in contact with the image side surface of the fifth lens; the radius of curvature R9 of the object side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 1.55 < R9 × N5 / d5s < 2.05.

[0015] According to an exemplary embodiment of the present application, half of the diagonal length ImgH of the effective pixel region of the imaging surface of the optical photographic lens, the outer diameter D0m of the image side end surface of the lens barrel, and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 1.1 ≤ ImgH / (D0m - D0s) < 1.5.

[0016] According to an exemplary embodiment of the present application, the air gap T12 between the first lens and the second lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP2 of the second spacer element satisfy: 5.0 ≤ (T12 + T34) / CP2 ≤ 12.0.

[0017] According to an exemplary embodiment of the present application, the radius of curvature R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer element, and the inner diameter d3s of the object side surface of the third spacer element satisfy: 10.65 < R6 / (D3s - d3s) < 34.65.

[0018] The optical camera lens provided by this application uses seven lenses. The third lens has a relatively high refractive index, which causes light to be easily refracted and reflected inside the third lens, generating more stray light. By reasonably configuring the relationship between the curvature radius of the object side of the third lens, the refractive index of the third lens and the inner diameter of the image side of the second spacer element, and the relationship between the effective focal length of the third lens and the distances of the second spacer element and the third spacer element along the optical axis, it is possible to constrain the curvature radius of the object side of the third lens and the effective focal length of the third lens, and limit the inner diameter of the image side of the second spacer element and the distances of the second spacer element and the third spacer element along the optical axis within a certain range, reducing the intensity of internal reflection stray light. While ensuring the imaging quality of the optical camera lens, the imaging stability of the optical camera lens is improved. Description of the Drawings

[0019] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, objectives, and advantages of this application will become more apparent. In the drawings:

[0020] Figure 1 A parameter annotation diagram of the optical camera lens according to this application is shown;

[0021] Figure 2 A schematic structural diagram of the optical camera lens according to Embodiment 1 of this application is shown;

[0022] Figure 3 A schematic structural diagram of the optical camera lens according to Embodiment 2 of this application is shown;

[0023] Figures 4A to 4C The axial chromatic aberration curve, distortion curve, and lateral chromatic aberration curve of the optical camera lens according to Embodiment 1 or 2 of this application are respectively shown;

[0024] Figure 5 A schematic structural diagram of the optical camera lens according to Embodiment 3 of this application is shown;

[0025] Figure 6 A schematic structural diagram of the optical camera lens according to Embodiment 4 of this application is shown;

[0026] Figures 7A to 7C The axial chromatic aberration curve, distortion curve, and lateral chromatic aberration curve of the optical camera lens according to Embodiment 3 or 4 of this application are respectively shown;

[0027] Figure 8 A schematic structural diagram of the optical camera lens according to Embodiment 5 of this application is shown;

[0028] Figure 9 A schematic structural diagram of the optical camera lens according to Embodiment 6 of this application is shown;

[0029] Figures 10A to 10C The axial chromatic aberration curve, distortion curve, and lateral chromatic aberration curve of the optical photographic lens according to Embodiment 5 or 6 of the present application are respectively shown;

[0030] Figure 11 The structural schematic diagram of the optical photographic lens according to Embodiment 7 of the present application is shown;

[0031] Figure 12 The structural schematic diagram of the optical photographic lens according to Embodiment 8 of the present application is shown;

[0032] Figures 13A to 13C The axial chromatic aberration curve, distortion curve, and lateral chromatic aberration curve of the optical photographic lens according to Embodiment 7 or 8 of the present application are respectively shown;

[0033] Figure 14A and Figure 14B The spot diagram and optical path diagram when the optical photographic lens satisfies R5×N3 / d2m = -5.77 and f3 / EP23 = -14.52 are respectively shown;

[0034] Figure 15A and Figure 15B The spot diagram and optical path diagram when the optical photographic lens satisfies R5×N3 / d2m = -5.67 and f3 / EP23 = -21.7 are respectively shown;

[0035] Figure 16A and Figure 16B The spot diagram and optical path diagram when the optical photographic lens satisfies R5×N3 / d2m = -5.63 and f3 / EP23 = -15.43 are respectively shown. Detailed Embodiments

[0036] For a better understanding of the present application, detailed descriptions are made for various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of the exemplary embodiments of the present application and do not limit the scope of the present application in any way.

[0037] In the accompanying drawings, for the sake of convenience of illustration, the thickness, size, and shape of the lenses are slightly exaggerated. 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 spherical or aspherical surfaces shown in the drawings. The drawings are only for illustration and are not drawn strictly to scale.

[0038] 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 closest to the object being photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0039] It should also be understood that the terms "comprising", "including", "having", "containing" and / or "including" when used in this specification mean 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. It should be noted that in this specification, the expressions of the first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature.

[0040] Unless otherwise defined, all terms used in this text have the same meaning as the ordinary understanding of those of ordinary skill in the art to which this application belongs. The terms should be interpreted to have a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0041] 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 following will refer to the drawings and combine with the embodiments to detail this application.

[0042] The features, principles and other aspects of this application are described in detail below.

[0043] Figure 1 It is a parameter annotation diagram according to an exemplary embodiment of this application. Refer to Figure 1, D0s represents the outer diameter of the object-side end face of the lens barrel, D0m represents the outer diameter of the image-side end face of the lens barrel, d1s represents the inner diameter of the object-side face of the first spacer element, d1m represents the inner diameter of the image-side face of the first spacer element, d2s represents the inner diameter of the object-side face of the second spacer element, d2m represents the inner diameter of the image-side face of the second spacer element, D3s represents the outer diameter of the object-side face of the third spacer element, d3s represents the inner diameter of the object-side face of the third spacer element, D4m represents the outer diameter of the image-side face of the fourth spacer element, D5s represents the outer diameter of the object-side face of the fifth spacer element, D5m represents the outer diameter of the image-side face of the fifth spacer element, d5s represents the inner diameter of the object-side face of the fifth spacer element, D6s represents the outer diameter of the object-side face of the sixth spacer element, d6m represents the inner diameter of the image-side face of the sixth spacer element, CP2 represents the maximum thickness of the second spacer element, EP12 represents the distance between the first spacer element and the second spacer element along the optical axis, EP23 represents the distance between the second spacer element and the third spacer element along the optical axis, EP34 represents the distance between the third spacer element and the fourth spacer element along the optical axis, EP45 represents the distance between the fourth spacer element and the fifth spacer element along the optical axis, and EP56 represents the distance between the fifth spacer element and the sixth spacer element along the optical axis.

[0044] Reference Figure 2 , Figure 3 , Figure 5 , Figure 6 , Figure 8 , Figure 9 , Figure 11 and Figure 12 , the first aspect of the present application provides such an optical photographic lens. The optical imaging lens may include an optical lens group. The optical lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. Among the first lens to the seventh lens, there may be an air gap between any two adjacent lenses.

[0045] In an exemplary embodiment, the first lens may have a positive optical power. The second lens may have a negative optical power. The third lens may have a negative optical power. The fourth lens may have a positive optical power. The fifth lens may have a negative optical power. The sixth lens may have a positive optical power. The seventh lens may have a negative optical power.

[0046] In an exemplary embodiment, the object-side face of the first lens may be convex, and the image-side face may be convex.

[0047] In an exemplary embodiment, the object-side face of the second lens may be convex, and the image-side face may be concave.

[0048] In an exemplary embodiment, the object-side face of the third lens may be concave, and the image-side face may be concave.

[0049] In an exemplary embodiment, the object side surface of the fourth lens may be convex, and the image side surface may be convex or concave.

[0050] In an exemplary embodiment, the object side surface of the fifth lens may be convex, and the image side surface may be concave.

[0051] In an exemplary embodiment, the object side surface of the sixth lens may be convex, and the image side surface may be concave.

[0052] In an exemplary embodiment, the object side surface of the seventh lens may be convex, and the image side surface may be concave.

[0053] In an exemplary embodiment, the number of lenses having optical power in the optical photographic lens may be seven.

[0054] In an exemplary embodiment, the optical photographic lens may further include a diaphragm. The diaphragm may be disposed on the object side of the first lens.

[0055] In an exemplary embodiment, the optical imaging lens may further include a spacer element group, and the spacer element group may include one or more of a first spacer element, a second spacer element, a third spacer element, a fourth spacer element, a fifth spacer element, and a sixth spacer element. Reasonable use of the spacer elements can effectively avoid the risk of stray light, reduce the interference to the image quality, and thus improve the imaging quality of the optical photographic lens.

[0056] In an exemplary embodiment, the spacer element group may further include auxiliary spacer elements and / or sub-auxiliary spacer elements. For example, the spacer element group may include one or more of a first auxiliary spacer element, a first sub-auxiliary spacer element, a third auxiliary spacer element, a fourth auxiliary spacer element, a fourth sub-auxiliary spacer element, a fifth auxiliary spacer element, a fifth sub-auxiliary spacer element, and a sixth auxiliary spacer element. The first auxiliary spacer element may be disposed on the image side surface of the first spacer element and at least partially in contact with the image side surface of the first spacer element. The first sub-auxiliary spacer element may be disposed on the image side surface of the first auxiliary spacer element and at least partially in contact with the image side surface of the first auxiliary spacer element. The third auxiliary spacer element may be disposed on the image side surface of the third spacer element and at least partially in contact with the image side surface of the third spacer element. The fourth auxiliary spacer element may be disposed on the image side surface of the fourth spacer element and at least partially in contact with the image side surface of the fourth spacer element. The fourth sub-auxiliary spacer element may be disposed on the image side surface of the fourth auxiliary spacer element and at least partially in contact with the image side surface of the fourth auxiliary spacer element. The fifth auxiliary spacer element may be disposed on the image side surface of the fifth spacer element and at least partially in contact with the image side surface of the fifth spacer element. The fifth sub-auxiliary spacer element may be disposed on the image side surface of the fifth auxiliary spacer element and at least partially in contact with the image side surface of the fifth auxiliary spacer element. The sixth auxiliary spacer element may be disposed on the image side surface of the sixth spacer element and at least partially in contact with the image side surface of the sixth spacer element.

[0057] In an exemplary embodiment, the optical photographic lens may further include a lens barrel. The optical lens group and the spacer element group may be disposed within the lens barrel. The lens barrel may include an object-side end face, an image-side end face, an outer ring surface, and an inner ring surface. Among them, the end face closest to the object side of the lens barrel is the object-side end face of the lens barrel, and the end face closest to the image side of the lens barrel is the image-side end face of the lens barrel; in a direction perpendicular to the optical axis, the outermost surface of the lens barrel away from the optical axis is the outer ring surface, and the innermost surface of the lens barrel closest to the optical axis is the inner ring surface.

[0058] In an exemplary embodiment, the outer peripheral surface of at least one lens in the optical lens group may have a trimmed portion and an untrimmed portion, and the outer diameter of the trimmed portion of the lens may be smaller than the outer diameter of the untrimmed portion of the lens. When the outer peripheral surface of the lens has a trimmed portion, the outer diameter of the lens generally refers to the outer diameter of the untrimmed portion of the lens. For example, the outer diameter of the object side surface of the lens refers to the outer diameter of the part of the untrimmed portion of the lens closest to the object side, and the outer diameter of the image side surface of the lens refers to the outer diameter of the part of the untrimmed portion of the lens closest to the image side.

[0059] In an exemplary embodiment, the outer peripheral surface of at least one spacer element in the spacer element group may have a trimmed portion and an untrimmed portion, and the outer diameter of the trimmed portion of the spacer element may be smaller than the outer diameter of the untrimmed portion of the spacer element. When the outer peripheral surface of the spacer element has a trimmed portion, the outer diameter of the spacer element generally refers to the outer diameter of the untrimmed portion of the spacer element. For example, the outer diameter of the object side surface of the spacer element refers to the outer diameter of the portion of the untrimmed portion of the spacer element closest to the object side, and the outer diameter of the image side surface of the spacer element refers to the outer diameter of the portion of the untrimmed portion of the spacer element closest to the image side.

[0060] In an exemplary embodiment, the spacer element group may include a second spacer element and a third spacer element. The second spacer element may be disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens. The third spacer element may be disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens. The radius of curvature R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d2m of the image side surface of the second spacer element may satisfy: -5.9 < R5×N3 / d2m < -5.6; the effective focal length f3 of the third lens and the distance EP23 between the second spacer element and the third spacer element along the optical axis may satisfy: -20.1 < f3 / EP23 ≤ -14.5. The optical imaging lens provided in the present application uses seven lenses, and the third lens has a relatively high refractive index, which may cause light to be easily refracted and reflected inside the third lens, generating more stray light. By reasonably configuring the relationship between the radius of curvature of the object side surface of the third lens, the refractive index of the third lens, and the inner diameter of the image side surface of the second spacer element, as well as the relationship between the effective focal length of the third lens and the distance between the second spacer element and the third spacer element along the optical axis, it is possible to constrain the radius of curvature of the object side surface of the third lens and the effective focal length of the third lens, and limit the inner diameter of the image side surface of the second spacer element and the distance between the second spacer element and the third spacer element along the optical axis within a certain range, reducing stray light and improving the imaging stability of the optical imaging lens while ensuring the imaging quality of the optical imaging lens.

[0061] Table 1 shows the maximum energy of the light spots of three optical imaging lenses (such as lens 1, lens 2, and lens 3). Among them, lens 1 satisfies R5×N3 / d2m = -5.77 and f3 / EP23 = -14.52. Lens 2 satisfies R5×N3 / d2m = -5.67 and f3 / EP23 = -21.7. Lens 3 satisfies R5×N3 / d2m = -5.63 and f3 / EP23 = -15.43. Figure 14A and Figure 14B are respectively the light spot diagram and the optical path diagram when light is incident on lens 1 at 44°. Figure 15A and Figure 15B are respectively the light spot diagram and the optical path diagram when light is incident on lens 2 at 44°. Figure 16A andFigure 16B They are respectively the spot diagram and the optical path diagram when the light is incident on the lens 3 at an angle of 44°.

[0062]

[0063]

[0064] Table 1

[0065] From Table 1, Figure 14A , Figure 15A and Figure 16A it can be seen that the maximum energy of the spot of lens 1 is 1.92E-06, the maximum energy of the spot of lens 2 is 5.42E-07, and the maximum energy of the spot of lens 3 is 1.07E-07. Compared with lens 1 and lens 2, the stray light of lens 3 is significantly reduced and the energy is significantly decreased. It can be seen that by controlling the optical camera lens to satisfy -5.9 < R5×N3 / d2m < -5.6, -20.1 < f3 / EP23 ≤ -14.5, the stray light can be effectively reduced, thereby improving the imaging quality of the optical camera lens.

[0066] In an exemplary embodiment, the spacer element group may include a sixth spacer element, and the sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The radius of curvature R13 of the object side of the seventh lens and the inner diameter d6m of the image side of the sixth spacer element may satisfy: 0.7 < R13 / d6m < 1.5. Reasonably configuring the ratio of the radius of curvature of the object side of the seventh lens to the inner diameter of the image side of the sixth spacer element can constrain the radius of curvature of the object side of the seventh lens, and make the concavity and convexity of the object side of the seventh lens within a certain range. At the same time, the inner diameter of the image side of the sixth spacer element can also be restricted to ensure that the light can be transmitted to the effective area of the imaging surface, effectively improving the imaging quality of the optical camera lens.

[0067] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be disposed on the image side of the first lens and at least partially in contact with the image side of the first lens. The second spacer element may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The inner diameter d2s of the object side of the second spacer element, the inner diameter d1m of the image side of the first spacer element, the radius of curvature R2 of the image side of the first lens, and the effective focal length f1 of the first lens may satisfy: -5.2 ≤ R2×(d2s - d1m) / f1 < -1.7. By reasonably configuring the relationship between the inner diameter of the object side of the second spacer element, the inner diameter of the image side of the first spacer element, the radius of curvature of the image side of the first lens, and the effective focal length of the first lens, it is possible to constrain the radius of curvature of the image side of the first lens and the effective focal length of the first lens, so that the concavity-convex degree and surface type size of the image side of the first lens are within a certain range, ensuring that the optical power of the first lens is relatively concentrated. At the same time, the difference between the inner diameters of the object side of the second spacer element and the image side of the first spacer element can be limited within a certain range, which is beneficial for the first spacer element and the second spacer element to block stray light and improve the imaging stability of the optical camera lens.

[0068] In an exemplary embodiment, the spacer element group may include a fourth spacer element and a fifth spacer element. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The combined focal length f45 of the fourth lens and the fifth lens, the distance EP45 along the optical axis of the fourth spacer element and the fifth spacer element, and the air gap T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 5.0 ≤ f45 / (EP45 + T45) ≤ 8.84. By reasonably configuring the relationship between the combined focal length of the fourth lens and the fifth lens, the air gap between the fourth spacer element and the fifth spacer element on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis, it is possible to constrain the combined focal length of the fourth lens and the fifth lens within an appropriate range. At the same time, by cooperating with restricting the distance along the optical axis of the fourth spacer element and the fifth spacer element, the processing feasibility and assembly feasibility of the fourth lens and the fifth lens can be improved, the assembly stability of the fourth spacer element and the fifth spacer element can be enhanced, and the internal structure of the lens barrel can be effectively optimized.

[0069] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be disposed on the image side of the first lens and at least partially in contact with the image side of the first lens. The second spacer element may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The distance EP12 between the first spacer element and the second spacer element along the optical axis and the effective focal length f2 of the second lens may satisfy: -54.0 < f2 / EP12 ≤ -22.48. By reasonably configuring the ratio of the distance between the first spacer element and the second spacer element along the optical axis to the effective focal length of the second lens, the object-side end length of the lens barrel can be constrained within an appropriate range, ensuring the machining quality of the lens barrel. At the same time, the effective focal length of the second lens can be restricted, effectively improving the focusing ability of the second lens on light rays.

[0070] In an exemplary embodiment, the spacer element group may include a third spacer element and a fourth spacer element. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The effective focal length f4 of the fourth lens, the distance EP34 between the third spacer element and the fourth spacer element along the optical axis, and the central thickness CT4 of the fourth lens on the optical axis may satisfy: 8.25 < f4 / (EP34 + CT4) < 10.2. By reasonably configuring the relationship between the effective focal length of the fourth lens, the distance between the third spacer element and the fourth spacer element along the optical axis, and the central thickness of the fourth lens on the optical axis, it is beneficial to ensure the central thickness of the fourth lens and the dimensional machining reliability of the third spacer element and the fourth spacer element. At the same time, the effective focal length of the fourth lens can be constrained within a certain range, effectively controlling the optical power of the fourth lens and optimizing the structure of the fourth lens.

[0071] In an exemplary embodiment, the spacer element group may include a fourth spacer element and a fifth spacer element. The fourth spacer element may be disposed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The radius of curvature R10 of the image side of the fifth lens, the outer diameter D5s of the object side of the fifth spacer element, and the outer diameter D4m of the image side of the fourth spacer element may satisfy: 4.7 ≤ R10 / (D5s - D4m) < 15.3. By reasonably configuring the relationship between the radius of curvature of the image side of the fifth lens, the outer diameter of the object side of the fifth spacer element, and the outer diameter of the image side of the fourth spacer element, the inner diameter difference of the part of the lens barrel in contact with the fourth spacer element and the fifth spacer element can be constrained within an appropriate range, improving the machinability and formability of the lens barrel. At the same time, the radius of curvature of the image side of the fifth lens can be restricted, ensuring that the image side of the fifth lens has an appropriate degree of concavity and convexity and reducing the performance sensitivity of the fifth lens.

[0072] In an exemplary embodiment, the spacer element group may include a fifth spacer element and a sixth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The distance EP56 between the fifth spacer element and the sixth spacer element along the optical axis and the central thickness CT6 of the sixth lens on the optical axis may satisfy: 1.25 < EP56 / CT6 < 2.95. Reasonably configuring the ratio of the distance between the fifth spacer element and the sixth spacer element along the optical axis to the central thickness of the sixth lens on the optical axis is beneficial to restricting the edge thickness of the sixth lens within a certain range, reducing the forming difficulty of the sixth lens, and at the same time, it can also limit the central thickness of the sixth lens, improving the assembly stability of the optical photography lens while ensuring the miniaturization of the optical photography lens.

[0073] In an exemplary embodiment, the spacer element group may include a first spacer element and a second spacer element. The first spacer element may be disposed on the image side of the first lens and at least partially in contact with the image side of the first lens. The second spacer element may be disposed on the image side of the second lens and at least partially in contact with the image side of the second lens. The curvature radius R3 of the object side of the second lens, the inner diameter d1s of the object side of the first spacer element, the curvature radius R4 of the image side of the second lens, and the inner diameter d2m of the image side of the second spacer element may satisfy: 1.45 < (R3 × d1s) / (R4 × d2m) < 1.75. Reasonably configuring the relationship between the curvature radius of the object side of the second lens, the inner diameter of the object side of the first spacer element, the curvature radius of the image side of the second lens, and the inner diameter of the image side of the second spacer element can constrain the curvature radii of the object side and the image side of the second lens, enabling the object side and the image side of the second lens to have appropriate surface profiles, optimizing the exit state of light exiting from the object side and the image side of the second lens, enhancing the imaging effect of the optical photography lens, and at the same time, it can also limit the inner diameters of the object side of the first spacer element and the image side of the second spacer element, ensuring that the first spacer element and the second spacer element can effectively block light and improving the imaging quality of the optical camera lens.

[0074] In an exemplary embodiment, the spacer element group may include a fifth spacer element and a sixth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The sixth spacer element may be disposed on the image side of the sixth lens and at least partially in contact with the image side of the sixth lens. The radius of curvature R11 of the object side of the sixth lens, the refractive index N6 of the sixth lens, the outer diameter D6s of the object side of the sixth spacer element, and the outer diameter D5m of the image side of the fifth spacer element may satisfy: 2.5 ≤ R11×N6 / (D6s - D5m) < 4.6. Reasonably configuring the relationship between the radius of curvature of the object side of the sixth lens, the refractive index of the sixth lens, the outer diameter of the object side of the sixth spacer element, and the outer diameter of the image side of the fifth spacer element can effectively restrict the difference in the outer diameters of the object side of the sixth spacer element and the image side of the fifth spacer element, and control the radius of curvature of the object side of the sixth lens, making the surface profile and distribution of the object side of the sixth lens more appropriate. At the same time, by restricting the refractive index of the sixth lens, while ensuring the assembly stability of the sixth lens, the ability of the sixth lens to transmit and converge light can be enhanced.

[0075] In an exemplary embodiment, the spacer element group may include a fifth spacer element. The fifth spacer element may be disposed on the image side of the fifth lens and at least partially in contact with the image side of the fifth lens. The radius of curvature R9 of the object side of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d5s of the object side of the fifth spacer element may satisfy: 1.55 < R9×N5 / d5s < 2.05. Reasonably configuring the relationship between the radius of curvature of the object side of the fifth lens, the refractive index of the fifth lens, and the inner diameter of the object side of the fifth spacer element can restrict the inner diameter of the object side of the fifth spacer element within a certain range, enabling the fifth spacer element to meet the production requirements. At the same time, it can also limit the radius of curvature of the object side of the fifth lens and the refractive index of the fifth lens, making the object side of the fifth lens have an appropriate degree of concavity and convexity. While ensuring the assembly stability of the fifth lens, the ability of the object side of the fifth lens to transmit and converge light can be enhanced.

[0076] In an exemplary embodiment, half of the diagonal length ImgH of the effective pixel region of the imaging surface of the optical camera lens, the outer diameter D0m of the image-side end face of the lens barrel, and the outer diameter D0s of the object-side end face of the lens barrel may satisfy: 1.1 ≤ ImgH / (D0m - D0s) < 1.5. By reasonably configuring the relationship between half of the diagonal length of the effective pixel region of the imaging surface of the optical camera lens, the outer diameter of the image-side end face of the lens barrel, and the outer diameter of the object-side end face of the lens barrel, the difference between the outer diameters of the image-side end face and the object-side end face of the lens barrel can be constrained within a certain range, ensuring an appropriate difference in the diameters of the image-side end face and the object-side end face of the lens barrel, improving the processability of the lens barrel. At the same time, the ratio of half of the diagonal length of the effective pixel region of the imaging surface of the optical camera lens to the difference between the outer diameters of the image-side end face and the object-side end face of the lens barrel can also be restricted, making the diameters of the image-side end face and the object-side end face of the lens barrel correspond to the effective pixel region of the imaging surface, which is beneficial to optimizing the transmission of light within the lens barrel and the distribution of light on the imaging surface.

[0077] In an exemplary embodiment, the spacer element group may include a second spacer element, and the second spacer element may be disposed on the image side surface of the second lens and at least partially in contact with the image side surface of the second lens. The air gap T12 between the first lens and the second lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP2 of the second spacer element may satisfy: 5.0 ≤ (T12 + T34) / CP2 ≤ 12.0. By reasonably configuring the relationship between the air gap between the first lens and the second lens on the optical axis, the air gap between the third lens and the fourth lens on the optical axis, and the maximum thickness of the second spacer element, the air gaps between the first lens, the second lens, the third lens, and the fourth lens can be made appropriate, optimizing the structural distribution of the lenses. At the same time, the maximum thickness of the second spacer element can also be restricted, improving the assembly stability of the second lens and the third lens.

[0078] In an exemplary embodiment, the spacer element group may include a third spacer element, and the third spacer element may be disposed on the image side surface of the third lens and at least partially in contact with the image side surface of the third lens. The radius of curvature R6 of the image side surface of the third lens, the outer diameter D3s of the object side surface of the third spacer element, and the inner diameter d3s of the object side surface of the third spacer element may satisfy: 10.65 < R6 / (D3s - d3s) < 34.65. By reasonably configuring the relationship between the radius of curvature of the image side surface of the third lens, the outer diameter of the object side surface of the third spacer element, and the inner diameter of the object side surface of the third spacer element, the radius of curvature of the image side surface of the third lens can be constrained, making the image side surface of the third lens have an appropriate degree of concavity and convexity, ensuring that the optical power of the third lens is relatively concentrated. At the same time, the inner diameter and outer diameter of the object side surface of the third spacer element can also be restricted, improving the assembly stability of the optical camera lens.

[0079] The second aspect of the present application provides an optical photographic lens. The optical photographic lens may include a lens barrel, an optical lens group, and a spacer element group disposed within the lens barrel. The optical lens group may include a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis. The spacer element group may include a fourth spacer element disposed on and in contact with the image side surface of the fourth lens and a fifth spacer element disposed on and in contact with the image side surface of the fifth lens.

[0080] The combined focal length f45 of the fourth lens and the fifth lens, the distance EP45 along the optical axis between the fourth spacer element and the fifth spacer element, and the air gap T45 between the fourth lens and the fifth lens on the optical axis may satisfy: 5.0 ≤ f45 / (EP45 + T45) ≤ 8.84. By reasonably configuring the relationship between the combined focal length of the fourth lens and the fifth lens, the air gap between the fourth spacer element and the fifth spacer element on the optical axis, and the air gap between the fourth lens and the fifth lens on the optical axis, the combined focal length of the fourth lens and the fifth lens can be constrained within an appropriate range. At the same time, by restricting the distance between the fourth spacer element and the fifth spacer element along the optical axis, the processing feasibility and assembly feasibility of the fourth lens and the fifth lens can be improved, the assembly stability of the fourth spacer element and the fifth spacer element can be enhanced, and the internal structure of the lens barrel can be effectively optimized.

[0081] However, those skilled in the art should understand that without departing from the technical solutions claimed in the present application, the number of lenses constituting the optical system can be changed to obtain the various results and advantages described in this specification.

[0082] Specific embodiments of the optical system applicable to the above embodiments will be further described below with reference to the accompanying drawings.

[0083] Example 1

[0084] The following refers to Figure 2 Describe the optical photographic lens according to Embodiment 1 of the present application.

[0085] As Figure 2 shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) may be disposed between the object side and the first lens E1.

[0086] The first lens E1 has a positive focal power. Its object side S1 is convex, and its image side S2 is convex. The second lens E2 has a negative focal power. Its object side S3 is convex, and its image side S4 is concave. The third lens E3 has a negative focal power. Its object side S5 is concave, and its image side S6 is concave. The fourth lens E4 has a positive focal power. Its object side S7 is convex, and its image side S8 is convex. The fifth lens E5 has a negative focal power. Its object side S9 is convex, and its image side S10 is concave. The sixth lens E6 has a positive focal power. Its object side S11 is convex, and its image side S12 is concave. The seventh lens E7 has a negative focal power. Its object side S13 is convex, and its image side S14 is concave. In the example, an optical element may be provided on the image side of the seventh lens E7. The optical element may be, for example, a filter. The optical element has an object side S15 (not shown) and an image side S16 (not shown). Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17 (not shown).

[0087] The spacer element group may include a first spacer element P1, a first auxiliary spacer element P1b, a first secondary auxiliary spacer element P1c, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fourth secondary auxiliary spacer element P4c, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary auxiliary spacer element P5c, a sixth spacer element P6, and a seventh spacer element P7. The spacer element can prevent excess light during the imaging process from entering the next lens, and at the same time enables the lens to better rest against the lens barrel, enhancing the structural stability of the optical imaging lens.

[0088] Table 2 shows the basic parameter table of the optical imaging lens of Embodiment 1. Among them, the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0089]

[0090]

[0091] Table 2

[0092] In this embodiment, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are both aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0093]

[0094] Among them, x is the sagitta, which is the distance from the vertex of the aspherical surface to the position along the optical axis at a height of h; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1 above); k is the conic constant; Ai is the correction coefficient of the i-th order of the aspherical surface. Table 2 gives the higher-order coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0095]

[0096]

[0097] Table 3

[0098] Example 2

[0099] The following describes the optical photographic lens according to Embodiment 2 of the present application based on Figure 3 the description.

[0100] As Figure 3 shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1. An optical element, such as a filter, can be further disposed on the image side of the seventh lens E7. The spacer element group may include a first spacer element P1, a first auxiliary spacer element P1b, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7.

[0101] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 1, that is, the basic parameter table of the optical photographic lens in this embodiment is the same as Table 2, and the aspherical coefficient table is the same as Table 3. The difference between this embodiment and Embodiment 1 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0102] Figure 4AThe axial chromatic aberration curve of the optical photographic lens according to Embodiment 1 or 2 is shown, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical photographic lens. Figure 4B The distortion curve of the optical photographic lens according to Embodiment 1 or 2 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 4C The lateral chromatic aberration curve of the optical photographic lens according to Embodiment 1 or 2 is shown, which represents the aberration of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 4A to 4C It can be seen that the optical photographic lens according to Embodiment 1 or 2 can achieve good imaging quality.

[0103] Example 3

[0104] The following refers to Figure 5 Describe the optical photographic lens according to Embodiment 3 of the present application.

[0105] As Figure 5 shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1.

[0106] The first lens E1 has a positive optical power, its object surface S1 is convex, and its image surface S2 is convex. The second lens E2 has a negative optical power, its object surface S3 is convex, and its image surface S4 is concave. The third lens E3 has a negative optical power, its object surface S5 is concave, and its image surface S6 is concave. The fourth lens E4 has a positive optical power, its object surface S7 is convex, and its image surface S8 is concave. The fifth lens E5 has a negative optical power, its object surface S9 is convex, and its image surface S10 is concave. The sixth lens E6 has a positive optical power, its object surface S11 is convex, and its image surface S12 is concave. The seventh lens E7 has a negative optical power, its object surface S13 is convex, and its image surface S14 is concave. In the example, an optical element can also be disposed on the image side of the seventh lens E7. The optical element can be, for example, a filter. The optical element has an object surface S15 (not shown) and an image surface S16 (not shown). The light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17 (not shown).

[0107] The spacer element group further includes a first spacer element P1, a first auxiliary spacer element P1b, a first secondary auxiliary spacer element P1c, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fourth secondary auxiliary spacer element P4c, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary auxiliary spacer element P5c, a sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light during the imaging process from entering the next lens, while enabling the lens and the lens barrel to better abut against each other, enhancing the structural stability of the optical imaging lens.

[0108] Table 4 shows the basic parameter table of the optical imaging lens of Embodiment 3, where the unit of the radius of curvature and the thickness / distance is millimeter (mm).

[0109]

[0110] Table 4

[0111] In this embodiment, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 5 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 for each of the aspherical surfaces S1 to S14 in Embodiment 3.

[0112]

[0113]

[0114] Table 5

[0115] Example 4

[0116] The following describes the optical imaging lens according to Embodiment 4 of the present application based on Figure 6 description.

[0117] As Figure 6As shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1. An optical element can also be disposed on the image side of the seventh lens E7, and the optical element can be, for example, a filter. The spacer element group further includes a first spacer element P1, a first auxiliary spacer element P1b, a second spacer element P2, a third spacer element P3, a third auxiliary spacer element P3b, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7.

[0118] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 3, that is, the basic parameter table of the optical photographic lens in this embodiment is the same as Table 4, and the aspheric coefficient table is the same as Table 5. The difference between this embodiment and Embodiment 3 lies in that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0119] Figure 7A The axial chromatic aberration curve of the optical photographic lens of Embodiment 3 or 4 is shown, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical photographic lens. Figure 7B The distortion curve of the optical photographic lens of Embodiment 3 or 4 is shown, which represents the distortion magnitude values corresponding to different image heights. Figure 7C The lateral chromatic aberration curve of the optical photographic lens of Embodiment 3 or 4 is shown, which represents the aberration of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 7A to 7C it can be known that the optical photographic lens of Embodiment 3 or 4 can achieve good imaging quality.

[0120] Example 5

[0121] The following refers to Figure 8 to describe the optical photographic lens according to Embodiment 5 of the present application.

[0122] As Figure 8 shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1.

[0123] The first lens E1 has a positive optical power, with its object side S1 being convex and its image side S2 being convex. The second lens E2 has a negative optical power, with its object side S3 being convex and its image side S4 being concave. The third lens E3 has a negative optical power, with its object side S5 being concave and its image side S6 being concave. The fourth lens E4 has a positive optical power, with its object side S7 being convex and its image side S8 being concave. The fifth lens E5 has a negative optical power, with its object side S9 being convex and its image side S10 being concave. The sixth lens E6 has a positive optical power, with its object side S11 being convex and its image side S12 being concave. The seventh lens E7 has a negative optical power, with its object side S13 being convex and its image side S14 being concave. In the example, an optical element may also be provided on the image side of the seventh lens E7. The optical element may be, for example, a filter, and the optical element has an object side S15 (not shown) and an image side S16 (not shown). The light from the object sequentially passes through each surface S1 to S16 and finally forms an image on the imaging surface S17 (not shown).

[0124] The spacer element group further includes a first spacer element P1, a first auxiliary spacer element P1b, a first secondary spacer element P1c, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fourth secondary spacer element P4c, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a fifth secondary spacer element P5c, a sixth spacer element P6, and a seventh spacer element P7.

[0125] Table 6 shows the basic parameter table of the optical imaging lens of Embodiment 5, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0126]

[0127] Table 6

[0128] In this embodiment, the object side and the image side of any one of the first lens E1 to the seventh lens E7 are aspherical surfaces. Table 7 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 that can be used for each aspherical mirror surface S1 to S14 in Embodiment 5.

[0129]

[0130]

[0131] Table 7

[0132] Example 6

[0133] The following is based on Figure 9 Describe the optical photographic lens according to Embodiment 6 of the present application.

[0134] As Figure 9 shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1. An optical element can also be disposed on the image side of the seventh lens E7, and the optical element can be, for example, a filter. The spacer element group further includes a first spacer element P1, a first auxiliary spacer element P1b, a first secondary spacer element P1c, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, a sixth auxiliary spacer element P6b, and a seventh spacer element P7.

[0135] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 5, that is, the basic parameter table of the optical photographic lens in this embodiment is the same as Table 6, and the aspherical coefficient table is the same as Table 7. The difference between this embodiment and Embodiment 5 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0136] Figure 10A Shows the axial chromatic aberration curve of the optical photographic lens of Embodiment 5 or 6, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the optical photographic lens. Figure 10B Shows the distortion curve of the optical photographic lens of Embodiment 5 or 6, which represents the distortion magnitude values corresponding to different image heights. Figure 10C Shows the lateral chromatic aberration curve of the optical photographic lens of Embodiment 5 or 6, which represents the aberration of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 10A to 10C It can be seen that the optical photographic lens of Embodiment 5 or 6 can achieve good imaging quality.

[0137] Example 7

[0138] The following refers to Figure 11 Describe the optical photographic lens according to Embodiment 7 of the present application.

[0139] As Figure 11As shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1.

[0140] The first lens E1 has a positive optical power, its object side surface S1 is convex, and its image side surface S2 is convex. The second lens E2 has a negative optical power, its object side surface S3 is convex, and its image side surface S4 is concave. The third lens E3 has a negative optical power, its object side surface S5 is concave, and its image side surface S6 is concave. The fourth lens E4 has a positive optical power, its object side surface S7 is convex, and its image side surface S8 is convex. The fifth lens E5 has a negative optical power, its object side surface S9 is convex, and its image side surface S10 is concave. The sixth lens E6 has a positive optical power, its object side surface S11 is convex, and its image side surface S12 is concave. The seventh lens E7 has a negative optical power, its object side surface S13 is convex, and its image side surface S14 is concave. In the example, an optical element can also be disposed on the image side of the seventh lens E7. The optical element can be, for example, a filter. The optical element has an object side surface S15 (not shown) and an image side surface S16 (not shown). Light from the object sequentially passes through each surface S1 to S16 and finally forms an image on an imaging surface S17 (not shown).

[0141] The spacer element group further includes a first spacer element P1, a first auxiliary spacer element P1b, a first secondary auxiliary spacer element P1c, a second spacer element P2, a third spacer element P3, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, and a seventh spacer element P7. The spacer elements can block excess light during the imaging process from entering the next lens, and at the same time enable the lens to better rest against the lens barrel, enhancing the structural stability of the optical imaging lens.

[0142] Table 8 shows the basic parameter table of the optical imaging lens of Embodiment 7, where the units of the radius of curvature and the thickness / distance are both millimeters (mm).

[0143]

[0144] Table 8

[0145] In this embodiment, the object side surface and the image side surface of any one of the first lens E1 to the seventh lens E7 are both aspherical surfaces. Table 9 gives the higher-order term coefficients A4, A6, A8, A 10 , A 12 , A 14 , A 16 , A18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0146]

[0147]

[0148] Table 9

[0149] Example 8

[0150] The following is based on Figure 12 Describe the optical photographic lens according to Embodiment 8 of the present application.

[0151] As Figure 12 shown, the optical photographic lens includes a lens barrel, a spacer element group, and an optical lens group. The optical lens group includes a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, and a seventh lens E7 arranged in sequence from the object side to the image side along the optical axis. An aperture STO (not shown) can be disposed between the object side and the first lens E1. An optical element can also be disposed on the image side of the seventh lens E7, and the optical element can be, for example, a filter. The spacer element group further includes a first spacer element P1, a first auxiliary spacer element P1b, a second spacer element P2, a third spacer element P3, a third auxiliary spacer element P3b, a fourth spacer element P4, a fourth auxiliary spacer element P4b, a fifth spacer element P5, a fifth auxiliary spacer element P5b, a sixth spacer element P6, a sixth auxiliary spacer element P6b, and a seventh spacer element P7.

[0152] The structure of the optical lens group in this embodiment is the same as that of the optical lens group in Embodiment 7, that is, the basic parameter table of the optical photographic lens in this embodiment is the same as Table 8, and the aspheric coefficient table is the same as Table 9. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some elements in the lens barrel and the spacer element group are different.

[0153] Figure 13A shows the axial chromatic aberration curve of the optical photographic lens of Embodiment 7 or 8, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical photographic lens. Figure 13B shows the distortion curve of the optical photographic lens of Embodiment 7 or 8, which represents the distortion magnitude values corresponding to different image heights. Figure 13C shows the lateral chromatic aberration curve of the optical photographic lens of Embodiment 7 or 8, which represents the aberration of different image heights on the imaging plane after the light rays pass through the lens. According to Figures 13A to 13CIt can be seen that the optical photographic lens of Embodiment 7 or 8 can achieve good imaging quality.

[0154] Table 10 gives the values of the parameters f1, f2, f3, f4, f5, f6, f7, f45, and ImgH for each of Embodiments 1-8.

[0155] Parameter / Example 1 2 3 4 5 6 7 8 f1 (mm) 10.88 10.88 10.79 10.79 10.91 10.91 11.01 11.01 f2 (mm) -32.95 -32.95 -31.04 -31.04 -32.28 -32.28 -33.27 -33.27 f3 (mm) -18.67 -18.67 -21.10 -21.10 -19.81 -19.81 -18.47 -18.47 f4 (mm) 19.99 19.99 18.23 18.23 19.94 19.94 20.26 20.26 f5 (mm) -3323.97 -3323.97 -4454.45 -4454.45 -830.38 -830.38 -560.75 -560.75 f6 (mm) 13.23 13.23 16.00 16.00 14.14 14.14 12.55 12.55 f7 (mm) -10.30 -10.30 -9.41 -9.41 -11.25 -11.25 -10.78 -10.78 f45 (mm) 19.37 19.37 17.71 17.71 19.58 19.58 20.17 20.17 ImgH (mm) 6.27 6.27 6.27 6.27 6.27 6.27 6.35 6.35

[0156] Table 10

[0157] Table 11 shows the values of the parameters d1s, d1m, d2s, d2m, d3s, D3s, D4m, d5s, D5s, D5m, d6m, D6s, D0s, D0m, EP12, EP23, EP34, EP45, EP56, and CP2 for each of Embodiments 1-8. Among them, some of the above parameters can be measured according to Figure 1 the marking method shown.

[0158] Parameter / Example 1 2 3 4 5 6 7 8 d1s (mm) 6.354 7.247 6.433 7.157 6.354 6.409 6.382 6.979 d1m (mm) 6.354 7.479 6.433 7.568 6.354 6.409 6.382 7.214 d2s (mm) 5.602 5.602 5.832 5.792 5.657 5.661 5.654 5.654 d2m (mm) 5.602 5.602 5.832 5.792 5.657 5.661 5.654 5.654 d3s (mm) 6.226 6.226 6.120 7.781 6.226 6.196 6.280 7.511 D3s (mm) 9.700 9.600 9.900 9.328 9.700 9.700 9.400 9.048 D4m (mm) 10.100 9.880 10.300 10.180 9.880 9.880 9.580 9.780 d5s (mm) 7.674 9.051 7.184 9.120 8.995 8.852 8.778 8.816 D5s (mm) 11.320 11.068 11.120 10.768 11.268 11.268 11.392 11.392 D5m (mm) 11.320 11.300 11.120 11.000 11.500 11.500 11.580 11.580 d6m (mm) 10.668 10.668 9.768 9.787 11.940 11.991 10.791 11.599 D6s (mm) 13.400 13.340 12.200 12.200 12.748 12.748 13.300 12.748 D0s (mm) 9.640 10.040 9.669 9.862 9.664 9.801 9.770 9.792 D0m (mm) 15.300 15.240 14.040 14.067 15.340 15.340 15.200 15.200 EP12 (mm) 1.323 0.723 1.035 0.576 1.436 1.436 1.390 0.734 EP23 (mm) 1.287 1.257 1.368 1.051 1.173 1.126 1.262 1.074 EP34 (mm) 0.868 0.898 1.037 0.735 0.937 0.984 1.003 0.822 EP45 (mm) 2.173 0.760 1.906 0.831 0.803 0.963 1.985 0.758 EP56 (mm) 2.580 1.331 1.895 1.232 1.190 1.090 1.407 1.146 CP2 (mm) 0.019 0.019 0.019 0.019 0.019 0.019 0.019 0.019

[0159] Table 11

[0160] Table 12 shows the values of the conditional expressions for each of Embodiments 1-8.

[0161]

[0162]

[0163] Table 12

[0164] The above description is only for the preferred embodiments of the present application and the description of the applied technical principles. Those skilled in the art should understand that the scope of the application involved in the present application is not limited to the technical solutions formed by the specific combination of the above technical features, and should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the technical solutions formed by mutually replacing the above features with the technical features (but not limited to) having similar functions disclosed in the present application.

Claims

1. An optical photographic lens, wherein, Comprising: An optical lens group, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens arranged in sequence from the object side to the image side along the optical axis; A spacer element group, including a second spacer element placed on the image side surface of the second lens and in contact with the image side surface of the second lens, and a third spacer element placed on the image side surface of the third lens and in contact with the image side surface of the third lens; And A lens barrel, with the optical lens group and the spacer element group placed inside the lens barrel; Wherein, the number of lenses with optical power in the optical photographic lens is seven; Wherein, the radius of curvature R5 of the object side surface of the third lens, the refractive index N3 of the third lens, and the inner diameter d2m of the image side surface of the second spacer element satisfy: -5.9 < R5×N3 / d2m < -5.6; The effective focal length f3 of the third lens and the distance EP23 between the second spacer element and the third spacer element along the optical axis satisfy: -20.1 < f3 / EP23 ≤ -14.

5.

2. The optical photographic lens according to claim 1, wherein The spacer element group further includes a sixth spacer element placed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens; The radius of curvature R13 of the object side surface of the seventh lens and the inner diameter d6m of the image side surface of the sixth spacer element satisfy: 0.7 < R13 / d6m < 1.

5.

3. The optical photographic lens according to claim 1, characterized in that, The spacer element group further includes a first spacer element placed on the image side surface of the first lens and in contact with the image side surface of the first lens; The inner diameter d2s of the object side surface of the second spacer element, the inner diameter d1m of the image side surface of the first spacer element, the radius of curvature R2 of the image side surface of the first lens, and the effective focal length f1 of the first lens satisfy: -5.2 ≤ R2×(d2s - d1m) / f1 < -1.

7.

4. The optical photographic lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element placed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element placed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; The combined focal length f45 of the fourth lens and the fifth lens, the distance EP45 between the fourth spacer element and the fifth spacer element along the optical axis, and the air gap T45 between the fourth lens and the fifth lens on the optical axis satisfy: 5.0 ≤ f45 / (EP45 + T45) ≤ 8.

84.

5. The optical photographic lens according to claim 1, wherein The spacer element group further includes a first spacer element placed on the image side surface of the first lens and in contact with the image side surface of the first lens; The distance EP12 between the first spacer element and the second spacer element along the optical axis and the effective focal length f2 of the second lens satisfy: -54.0 < f2 / EP12 ≤ -22.

48.

6. The optical photographic lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element placed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens; The effective focal length f4 of the fourth lens, the distance EP34 along the optical axis between the third spacer element and the fourth spacer element, and the central thickness CT4 of the fourth lens on the optical axis satisfy: 8.25 < f4 / (EP34 + CT4) < 10.

2.

7. The optical photographic lens according to claim 1, characterized in that, The spacer element group further includes a fourth spacer element disposed on the image side surface of the fourth lens and in contact with the image side surface of the fourth lens, and a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; The radius of curvature R10 of the image side surface of the fifth lens, the outer diameter D5s of the object side surface of the fifth spacer element, and the outer diameter D4m of the image side surface of the fourth spacer element satisfy: 4.7 ≤ R10 / (D5s - D4m) < 15.

3.

8. The optical photographic lens according to claim 1, characterized in that, The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens; The distance EP56 along the optical axis between the fifth spacer element and the sixth spacer element and the central thickness CT6 of the sixth lens on the optical axis satisfy: 1.25 < EP56 / CT6 < 2.

95.

9. The optical photographic lens according to claim 1, wherein The spacer element group further includes a first spacer element disposed on the image side surface of the first lens and in contact with the image side surface of the first lens; The radius of curvature R3 of the object side surface of the second lens, the inner diameter d1s of the object side surface of the first spacer element, the radius of curvature R4 of the image side surface of the second lens, and the inner diameter d2m of the image side surface of the second spacer element satisfy: 1.45 < (R3 × d1s) / (R4 × d2m) < 1.

75.

10. The optical photographic lens according to claim 1, wherein The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens, and a sixth spacer element disposed on the image side surface of the sixth lens and in contact with the image side surface of the sixth lens; The radius of curvature R11 of the object side surface of the sixth lens, the refractive index N6 of the sixth lens, the outer diameter D6s of the object side surface of the sixth spacer element, and the outer diameter D5m of the image side surface of the fifth spacer element satisfy: 2.5 ≤ R11 × N6 / (D6s - D5m) < 4.

6.

11. The optical photographic lens according to claim 1, wherein, The spacer element group further includes a fifth spacer element disposed on the image side surface of the fifth lens and in contact with the image side surface of the fifth lens; The radius of curvature R9 of the object side surface of the fifth lens, the refractive index N5 of the fifth lens, and the inner diameter d5s of the object side surface of the fifth spacer element satisfy: 1.55 < R9 × N5 / d5s < 2.

05.

12. The optical photographic lens according to any one of claims 1 to 11, characterized in that, Half of the diagonal length ImgH of the effective pixel region of the imaging surface of the optical photographic lens, the outer diameter D0m of the image side end surface of the lens barrel, and the outer diameter D0s of the object side end surface of the lens barrel satisfy: 1.1 ≤ ImgH / (D0m - D0s) < 1.

5.

13. The optical photographic lens according to any one of claims 1 to 11, characterized in that, The air gap T12 between the first lens and the second lens on the optical axis, the air gap T34 between the third lens and the fourth lens on the optical axis, and the maximum thickness CP2 of the second spacer element satisfy: 5.0 ≤ (T12 + T34) / CP2 ≤ 12.

0.

14. The optical photographic lens according to any one of claims 1 to 11, characterized in that The radius of curvature R6 of the image side of the third lens, the outer diameter D3s of the object side of the third spacer element, and the inner diameter d3s of the object side of the third spacer element satisfy: 10.65 < R6 / (D3s - d3s) < 34.

65.

15. The optical photographic lens according to any one of claims 1 to 11, characterized in that The first lens has a positive optical power, its object side is convex, and its image side is convex; The second lens has a negative optical power, its object side is convex, and its image side is concave; The third lens has a negative optical power, its object side is concave, and its image side is concave; The fourth lens has a positive optical power, its object side is convex; The fifth lens has a negative optical power, its object side is convex, and its image side is concave; The sixth lens has a positive optical power, its object side is convex, and its image side is concave; The seventh lens has a negative optical power, its object side is convex, and its image side is concave.

Images