Optical imaging device

Abstract

The utility model discloses an optical imaging device. The optical imaging device comprises a reflecting element; the optical lens group comprises a first lens with positive focal power, a second lens with negative focal power, a third lens with positive focal power, a fourth lens with negative focal power and a fifth lens with negative focal power; the spacing element group comprises a first spacing element and a second spacing element, and the first spacing element is arranged between the first lens and the second lens and is in contact with the second lens; the second spacing element is arranged between the second lens and the third lens and is in contact with the second lens; the optical imaging device satisfies: 2.0 lt; ry / d1slt, Ry / d1slt; 7.0, and the requirement of-2.5 lt is met; f2 / (D2s-2 * DT21) lt; ry is the curvature radius of the emergent surface of the reflecting element, d1s is the inner diameter of the object side surface of the first spacing element, D2s is the outer diameter of the object side surface of the second spacing element, and DT21 is the maximum effective radius of the object side surface of the second lens.

Description

Technical Field

[0001] This application relates to the field of optical devices, and particularly to an optical imaging device including five lenses. Background Art

[0002] With the rapid development of portable devices such as smart phones, consumers have higher and higher requirements for imaging devices. Periscope telephoto lenses are widely used in portable devices because they can compensate for aberrations by combining multiple lenses to improve imaging quality, and can meet the shooting of objects at macro and infinity by adopting an internal focusing and grouping design.

[0003] In periscope telephoto lenses, high refractive index and sensitive lenses are often used as the second lens. How to design to improve the overall performance of periscope telephoto lenses with high refractive index and sensitive lenses is the focus of current research. Summary of the Utility Model

[0004] One aspect of this application provides an optical imaging device, which includes a reflection element, an optical lens group, and a spacer element group. The optical lens group includes a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a negative optical power arranged in sequence from the object side to the image side along the optical axis; the spacer element group includes a first spacer element and a second spacer element. The first spacer element is placed between the first lens and the second lens and is in contact with the second lens; the second spacer element is placed between the second lens and the third lens and is in contact with the second lens. Among them, the optical imaging device satisfies: 2.0 < Ry / d1s < 7.0, -2.5 < f2 / (D2s - 2 DT21) < -1.4, where f2 is the effective focal length of the second lens, Ry is the radius of curvature of the exit surface of the reflection element, d1s is the inner diameter of the object side surface of the first spacer element, D2s is the outer diameter of the object side surface of the second spacer element, and DT21 is the maximum effective radius of the object side surface of the second lens.

[0005] The second lens of the optical imaging device provided by the embodiment of this application is made of a material with high refractive index and sensitivity. Priority is given to ensuring the processability of the second lens and the bearing length can effectively improve the surface shape change of the second lens after assembly, so as to further improve the assembly stability of the first lens, the second lens, and the third lens. Among them, for the first spacer element, by making the light pass through the reflection element and satisfying the conditional formula 2.0 < Ry / d1s < 7.0, the exit angle of the third lens can be reduced, and the incident height of the fourth lens can be reduced, realizing the miniaturization of the optical imaging device on the basis of ensuring the bearing length. On this premise, designing the focal length of the second lens to be negative is beneficial to reserving more design space for the third lens, and by satisfying the conditional formula -2.5 < f2 / (D2s - 2 DT21) < -1.4. On the basis of ensuring the contact length, the volume of the entire optical lens group can be miniaturized, and the lens processing and forming can better ensure the surface shape of the lens, reduce the eccentricity of the optical imaging device after assembly and the deformation amount of the image side surface of the second lens, and improve the overall performance of the optical imaging device.

[0006] On the other hand, the present application provides an optical imaging device, which includes: a reflection element; an optical lens group, including, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a negative optical power; and a spacer element group, including at least a first spacer element, a second spacer element, and a fourth spacer element. The first spacer element is disposed between the first lens and the second lens and is in contact with the second lens; the second spacer element is disposed between the second lens and the third lens and is in contact with the second lens; the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. The optical imaging device satisfies: 9 < EP024 / SAG41 + EP024 / SAG51 < 35, where EP024 is the distance along the optical axis between the object-side end face of the second lens barrel and the object-side surface of the fourth spacer element, SAG41 is the axial distance between the intersection point of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens, and SAG51 is the axial distance between the intersection point of the object-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fifth lens.

[0007] On another aspect, the present application provides an optical imaging device, which includes: a reflection element; an optical lens group, including, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a negative optical power; a lens barrel assembly, the lens barrel assembly includes a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel; and a spacer element group, including at least a first spacer element and a second spacer element, the first spacer element is disposed between the first lens and the second lens and is in contact with the second lens, the second spacer element is disposed between the second lens and the third lens and is in contact with the second lens, the optical imaging device satisfies: -3.5 < f45 / L02 < -2.0, where f45 is the combined focal length of the fourth lens and the fifth lens, and L02 is the distance along the optical axis between the object-side end face and the image-side end face of the second lens barrel.

[0008] In an exemplary embodiment, the optical imaging device satisfies: 0.4 < (D2s - d2s) / DT22 < 0.8, where D2s is the outer diameter of the object side surface of the second spacer element, d2s is the inner diameter of the object side surface of the second spacer element, and DT22 is the maximum effective radius of the image side surface of the second lens.

[0009] In an exemplary embodiment, the optical imaging device satisfies: 6.0 < d2m / SAG31 < 8.0, where SAG31 is the axial distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens, and d2m is the inner diameter of the image side surface of the second spacer element.

[0010] In an exemplary embodiment, the optical imaging device satisfies: 1.2 < EP12 / SAG22 + SAG21 < 1.8, where EP12 is the axial distance between the image side surface of the first spacer element and the object side surface of the second spacer element along the optical axis, SAG21 is the axial distance between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens, and SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens.

[0011] In an exemplary embodiment, the reflective element is a plastic prism having a focal power.

[0012] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The optical imaging device satisfies: -3.5 < f45 / L02 < -2.0, where f45 is the combined focal length of the fourth lens and the fifth lens, and L02 is the axial distance between the object side end face and the image side end face of the second lens barrel along the optical axis.

[0013] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The optical imaging device satisfies: 1.3 < L01 / CT3 < 1.6, where L01 is the axial distance between the object side end face and the image side end face of the first lens barrel along the optical axis, and CT3 is the central thickness of the third lens on the optical axis.

[0014] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The optical imaging device satisfies: -12 < d01m / SAG32 < -6, where d01m is the inner diameter of the image-side end face of the first lens barrel, and SAG32 is the axial distance between the intersection of the image-side surface of the third lens and the optical axis and the vertex of the effective radius of the image-side surface of the third lens.

[0015] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The spacer element group further includes a fourth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. And the optical imaging device satisfies: 2.0 < EP024 / CT4 N4 < 3.0, where EP024 is the axial distance between the object-side end face of the second lens barrel and the object-side surface of the fourth spacer element, CT4 is the central thickness of the fourth lens on the optical axis, and N4 is the refractive index of the fourth lens.

[0016] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The spacer element group further includes a fourth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. The optical imaging device satisfies: ds02 < dm01, where dm01 is the minimum circular opening aperture of the image side of the first lens barrel, and ds02 is the minimum circular opening aperture of the object side of the second lens barrel.

[0017] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The spacer element group further includes a fourth spacer element. The fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. And the optical imaging device satisfies: 1.0 < (CT4 + CT5) / (EP024 + CP4) < 1.8, where CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, EP024 is the axial distance between the object-side end face of the second lens barrel and the object-side surface of the fourth spacer element, and CP4 is the maximum thickness of the fourth spacer element in the axial direction.

[0018] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The spacer element group further includes a fourth spacer element, and the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. And the optical imaging device satisfies: 9 < EP024 / SAG41 + EP024 / SAG51 < 35, where EP024 is the distance along the optical axis from the object-side end face of the second lens barrel to the object-side surface of the fourth spacer element, SAG41 is the axial distance between the intersection of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens, and SAG51 is the axial distance between the intersection of the object-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fifth lens.

[0019] In an exemplary embodiment, the spacer element group further includes a fourth spacer element, and the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. The optical imaging device satisfies: 3.0 < d4m / DT42 + d4m / DT51 < 4.5, where d4m is the inner diameter of the image-side surface of the fourth spacer element, DT42 is the maximum effective radius of the image-side surface of the fourth lens, and DT51 is the maximum effective radius of the object-side surface of the fifth lens.

[0020] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The spacer element group further includes a fourth spacer element, and the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. And the optical imaging device satisfies: 8 < CT3 / CT2 (d01m / d2s) < 12, where CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, d2s is the inner diameter of the object-side surface of the second spacer element, and d01m is the inner diameter of the image-side end face of the first lens barrel.

[0021] In an exemplary embodiment, the optical imaging device further includes a lens barrel assembly. The lens barrel assembly includes a first lens barrel and a second lens barrel. The first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel. The spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. And the optical imaging device satisfies: 2.5 < d02m / DT52 < 3.3, where d02m is the inner diameter of the image-side end face of the second lens barrel, and DT52 is the maximum effective radius of the image-side surface of the fifth lens. Description of the Drawings

[0022] Other features, objects, and advantages of the present application will become more apparent by reading the following detailed description of non-limiting embodiments with reference to the accompanying drawings. Among them:

[0023] Figures 1 to 3 Schematic structural diagrams of the optical imaging devices according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application are respectively shown;

[0024] Figure 4A The axial chromatic aberration curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3 is shown; Figure 4B The astigmatism curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3 is shown; Figure 4C The distortion curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3 is shown; Figure 4D The longitudinal chromatic aberration curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3 is shown;

[0025] Figure 5 A partial structural diagram of the optical imaging device satisfying f2 / (D2sB DT21) = -2 according to an embodiment of the present application is shown;

[0026] Figure 6 It shows the change of the image-side surface of the second lens in Figure 5 under the simulated normal assembly state;

[0027] Figure 7 A partial structural diagram of the optical imaging device satisfying f2 / (D2sB DT21) = -0.5 according to an embodiment of the present application is shown;

[0028] Figure 8 It shows the change of the image-side surface of the second lens in Figure 7 under the simulated normal assembly state;

[0029] Figure 9 A partial structural diagram of the optical imaging device satisfying f2 / (D2sB Partial structural schematic diagram of an optical imaging device with DT21) = -3;

[0030] Figure 10 Shows the change in the image side of the second lens under the simulated normal assembly state; Figure 9 in;

[0031] Figure 11A Shows Figure 5 the MTF simulation results of each field of view of the structure in; Figure 11B Shows Figure 7 the MTF simulation results of each field of view of the structure in; Figure 11C Shows Figure 9 the MTF simulation results of each field of view of the structure in;

[0032] Figure 12 Shows the parameter annotation diagram of the optical imaging device according to the present application;

[0033] Figures 13 to 15 Respectively show the structural schematic diagrams of the optical imaging devices according to Embodiment 4, Embodiment 5, and Embodiment 6 of the present application;

[0034] Figure 16A Shows the axial chromatic aberration curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6; Figure 16B Shows the astigmatism curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6; Figure 16C Shows the distortion curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6; Figure 16D Shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6;

[0035] Figures 17 to 19 Respectively show the structural schematic diagrams of the optical imaging devices according to Embodiment 7, Embodiment 8, and Embodiment 9 of the present application;

[0036] Figure 20A Shows the axial chromatic aberration curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9; Figure 20B Shows the astigmatism curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9; Figure 20C Shows the distortion curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9; Figure 20D Shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9. Detailed implementation manners

[0037] To better understand the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application and do not limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements.

[0038] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature and do not represent any limitation on the features. Therefore, without departing from the teachings of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0039] In the drawings, for ease of illustration, the thickness, size, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0040] In this document, 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 image plane is called the image side surface of the lens.

[0041] It should also be understood that the terms "comprising" and / or "having", 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 describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0042] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having 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.

[0043] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0044] Figure 1The structural schematic diagram of an optical imaging device according to an embodiment of the present application is shown. As Figure 1 shown, the optical imaging device provided by the present application includes: a reflection element, an optical lens group, and a spacer element group.

[0045] In an exemplary embodiment, the optical lens group may include, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a negative optical power. In an exemplary embodiment, at least the second lens may be made of a high refractive index and sensitive material.

[0046] In an exemplary embodiment, the optical imaging device may further include a lens barrel assembly, and the lens barrel assembly may include a first lens barrel and a second lens barrel arranged in order from the object side to the image side along the optical axis. Among them, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel. There may be an air gap between adjacent two of the first lens to the fifth lens. In particular, the spacing distance along the optical axis between the first lens barrel and the second lens barrel may vary. In an exemplary embodiment, the first lens barrel may abut against the second lens barrel.

[0047] In an exemplary embodiment, the lenses arranged in the first lens barrel, that is, the first lens, the second lens, and the third lens, are assembled in an upside-down manner.

[0048] In an exemplary embodiment, the positions of the lenses arranged in the first lens barrel are fixed relative to the image plane on the optical axis. The lenses arranged in the second lens barrel can move relative to the lenses arranged in the first lens barrel along the optical axis, that is, the distance of the lenses arranged in the second lens barrel relative to the lenses arranged in the first lens barrel on the optical axis is adjustable. When the distance between the object and the optical imaging device changes from far to near, adjusting the distance of the second lens barrel relative to the lenses arranged in the first lens barrel on the optical axis can enable the optical imaging device to switch between the telephoto state and the close-up state, realizing the focusing and zooming of the optical imaging device. In an exemplary embodiment, the spacing distance along the optical axis between the image-side end face of the first lens barrel and the object-side end face of the second lens barrel can be changed. Specifically, the spacing distance along the optical axis between the image side face of the third lens and the object side face of the fourth lens is changed to change the focal length of the optical imaging device. In particular, when the spacing distance along the optical axis between the image side face of the third lens and the object side face of the fourth lens is changed, the spacing distances along the optical axis between other components in the optical imaging device remain unchanged. For example, the spacing distance along the optical axis between the image side face of the fourth lens and the object side face of the fifth lens remains unchanged, and the spacing distance along the optical axis between the image side face of the second lens and the object side face of the third lens remains unchanged, etc.

[0049] In an exemplary embodiment, the reflecting element can be set at any required angle to bend the optical path. The reflecting element can be arranged such that the incident optical path is deflected by a preset degree (for example, but not limited to 90°). In an exemplary embodiment, the reflecting element can be a prism, and more specifically, a plastic prism.

[0050] In an exemplary embodiment, the reflecting element can be disposed on the object side of the first lens.

[0051] In an exemplary embodiment, the reflecting element has an incident surface, a reflecting surface, and an exit surface. Light enters the reflecting element through the incident surface, is totally reflected by the reflecting surface and turns towards the exit surface, and then exits into the first lens along the direction of the optical axis. As an example, the reflecting element can be a prism with a focal power, and more specifically, a plastic prism with a focal power. Its incident surface and reflecting surface can both be aspherical surfaces. Using this setting method is equivalent to enabling the reflecting element to not only undertake the function of folding the optical path of a traditional prism but also undertake a part of the focal power, acting as an effective imaging unit and serving multiple purposes with one object.

[0052] In an exemplary embodiment, the number of elements with focal power in the optical imaging device can be 6, including 1 reflecting element and 5 lenses of the optical lens group.

[0053] In an exemplary embodiment, after the light passes through the reflecting element, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens, it forms an image on the imaging surface. Using this setting method in the present application is equivalent to integrating the reflecting element and the first lens into one body, enabling the reflecting element to not only undertake the function of folding the optical path of a traditional prism but also undertake a part of the focal power, acting as an effective imaging unit and serving multiple purposes with one object. On the other hand, since the plastic prism is lighter in mass compared to the glass material, using the plastic prism of the present application can reduce the motor load of the optical imaging device. Moreover, using the plastic prism can make the resolving power of the optical imaging device better and the cost lower.

[0054] In an exemplary embodiment, the spacer element group can include a first spacer element, a second spacer element, and a fourth spacer element. Among them, the first spacer element is disposed between the first lens and the second lens and is at least partially in contact with the second lens; the second spacer element is placed between the second lens and the third lens and is at least partially in contact with the second lens; the fourth spacer element is disposed between the fourth lens and the fifth lens and is at least partially in contact with the fourth lens. The spacer element group is disposed within the lens barrel assembly. 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 imaging device. At the same time, it also ensures the bearing stability of the lenses.

[0055] Figures 1 to 3Schematic structural diagrams of optical imaging devices according to Embodiment 1, Embodiment 2, and Embodiment 3 of the present application are respectively shown. Parameters such as the radius of curvature and central thickness of the reflecting element, the first to fifth lenses, and the spacing distance and higher-order term coefficients between the lenses are the same under these three embodiments. However, the inner diameter of the object side surface of the first spacer element, the inner diameter of the object side surface of the second spacer element, the outer diameter of the object side surface of the second spacer element, the inner diameter of the image side surface of the fourth spacer element, the inner diameter of the image side end surface of the first lens barrel, the spacing distance along the optical axis between the image side surface of the first spacer element and the object side surface of the second spacer element, the maximum horizontal distance along the optical axis from the object side end surface to the image side end surface of the first lens barrel, the inner diameter of the image side end surface of the second lens barrel, the spacing distance along the optical axis from the object side end surface of the second lens barrel to the object side surface of the fourth spacer element, the maximum thickness of the fourth spacer element along the optical axis direction, and the spacing distance along the optical axis from the object side end surface to the image side end surface of the second lens barrel are different. Or rather, the main structures for imaging are the same in these three embodiments, while the auxiliary structures for imaging (the first spacer element, the first spacer element, the first spacer element and the first lens barrel, the second lens barrel) are different.

[0056] In an exemplary embodiment, the optical imaging device may further include a diaphragm disposed on the object side of the first lens. As an example, the diaphragm may be disposed between the reflecting element and the first lens.

[0057] In an exemplary embodiment, the optical imaging device may further include a protective glass and / or a filter, and the protective glass and / or the filter are disposed on the image side of the fifth lens.

[0058] In an exemplary embodiment, after passing through the reflecting element, the diaphragm, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the protective glass, the light forms an image on the imaging surface.

[0059] In an exemplary embodiment, the optical imaging device satisfies: 2.0 < Ry / d1s < 7.0, and satisfies -2.5 < f2 / (D2s - 2 DT21) < -1.4. Here, Ry is the radius of curvature of the exit surface of the reflecting element, d1s is the inner diameter of the object side surface of the first spacer element, D2s is the outer diameter of the object side surface of the second spacer element, and DT21 is the maximum effective radius of the object side surface of the second lens. The second lens is made of a material with a high refractive index and sensitivity. It is preferably ensured that the processability of the second lens and the bearing length can effectively improve the surface shape change of the second lens after assembly, so as to further improve the assembly stability of the first lens, the second lens, and the third lens. Among them, for the first spacer element, by making light pass through the reflecting element and satisfying the conditional expression 2.0 < Ry / d1s < 7.0, the exit angle of the third lens can be reduced, the incident height of the fourth lens can be lowered, and miniaturization of the optical imaging device can be achieved on the basis of ensuring the bearing length. On this premise, the focal length of the second lens is designed to be negative, which is beneficial to reserving more design space for the third lens, and by satisfying the conditional expression -2.5 < f2 / (D2s - 2 DT21) < -1.4, it is possible to achieve miniaturization of the volume of the entire optical lens group on the basis of ensuring the bearing length, and make the lens processing and forming better ensure the surface shape of the lens, reduce the eccentricity of the optical imaging device after assembly and the deformation amount of the image side surface of the second lens, and improve the overall performance of the optical imaging device.

[0060] Figure 5 shows a partial structural schematic diagram of an optical imaging device satisfying f2 / (D2s - 2 DT21) = -2 according to an embodiment of the present application, Figure 6 shows, under the simulation of the normal assembly state, Figure 5 the change of the image side surface of the second lens in Figure 7 shows a partial structural schematic diagram of an optical imaging device satisfying f2 / (D2s - 2 DT21) = -0.5 according to an embodiment of the present application, Figure 8 shows, under the simulation of the normal assembly state, Figure 7 the change of the image side surface of the second lens in Figure 9 shows a partial structural schematic diagram of an optical imaging device satisfying f2 / (D2s - 2 DT21) = -3 according to an embodiment of the present application, Figure 10 shows, under the simulation of the normal assembly state, Figure 9 the change of the image side surface of the second lens in. As Figures 5 to 10 shown, Figure 7 the deformation amount of the image side surface of the second lens shown in the embodiment shown in Figure 9 and the embodiment shown in Figure 5 are both larger than that of the embodiment shown in

[0061] Figure 11A shows Figure 5MTF simulation results of the structures in Figure 11B show Figure 7 MTF simulation results of the structures in Figure 11C show Figure 9 MTF simulation results of the structures in. Among them, as Figure 11B shown, for low frequency (100LP / MM), it shows that the overall MTF on the meridian field (TAN) axis drops between 2% - 4%, and the MTF on the sagittal direction (SAG) axis drops by about 2% - 6%; for high frequency (200LP / MM), it shows that the overall MTF on the meridian field (TAN) axis drops between 2% - 4%, and the MTF on the sagittal direction (SAG) axis drops by about 2% - 6%. As Figure 11C shown, for low frequency (100LP / MM), it shows that the overall MTF on the meridian field (TAN) axis drops between 2% - 5%, and the MTF on the sagittal direction (SAG) axis drops by about 1% - 2%; for high frequency (200LP / MM), it shows that the overall MTF on the meridian field (TAN) axis drops between 1% - 3%, and the MTF on the sagittal direction (SAG) axis drops by about 3% - 6%.

[0062] Combined with Figure 6 , Figure 8 , Figure 10 and Figures 11A to 11B , it can be seen that by making the optical imaging device satisfy -2.5 < f2 / (D2s - 2 DT21) < -1.4, it is beneficial to ensure the matching length of the front and rear lenses of the second lens for the eccentricity of the assembly and the surface shape of the second lens to improve the overall performance of the optical imaging device.

[0063] In an exemplary embodiment, the optical imaging device satisfies: -3.5 < f45 / L02 < -2.0. Wherein, f45 is the combined focal length of the fourth lens and the fifth lens, and L02 is the distance along the optical axis from the object - side end face to the image - side end face of the second lens barrel. By reasonably distributing the optical power of the lenses disposed in the second lens barrel, even if the optical imaging device provided in the present application satisfies the above conditional formula, it can enable the optical system of the optical imaging device to effectively reduce the sensitivity of the optical system while having good imaging quality, and improve the optical performance and assembly yield.

[0064] In an exemplary embodiment, the optical imaging device satisfies: 0.4 < (D2s - d2s) / DT22 < 0.8. Wherein, D2s is the outer diameter of the object side surface of the second spacer element, d2s is the inner diameter of the object side surface of the second spacer element, and DT22 is the maximum effective radius of the object side surface of the second lens. (D2s - d2s) represents the difference between the outer and inner diameters of the second spacer element and the annulus width of the second spacer element. The value of ((D2s - d2s) / DT22) affects the bearing length of the second spacer element on the second lens. On the one hand, the spacer element group in the present application can play a role in bearing on the lens. On the other hand, making the optical imaging device satisfy the above conditional formula can enable the second spacer element to effectively block stray light and improve the assembly performance and overall quality of the lens disposed in the first lens barrel.

[0065] In an exemplary embodiment, the optical imaging device satisfies: 6.0 < d2m / SAG31 < 8.0. Wherein, SAG31 is the axial distance between the intersection of the object side surface of the third lens and the optical axis and the vertex of the effective radius of the object side surface of the third lens, and d2m is the inner diameter of the image side surface of the second spacer element. By making the optical imaging device satisfy the above conditional formula, it can be ensured that the protruding length of the second spacer element relative to the lenses on both sides is within a reasonable range. Thus, on the one hand, it can avoid the second spacer element being too short and there being a light leakage phenomenon. On the other hand, it can avoid the second spacer element being too long and there being a long cantilever structure, and there being a situation where the spacer is deformed during the assembly process and the baking process, resulting in new stray light and affecting the optical parameters.

[0066] In an exemplary embodiment, the optical imaging device satisfies: 1.3 < L01 / CT3 < 1.6. Wherein, L01 is the maximum horizontal distance along the optical axis from the object side end surface of the first lens barrel to the image side surface, and CT3 is the central thickness of the third lens on the optical axis. By making the optical imaging device satisfy the above conditional formula, the thickness of the lens disposed in the first lens barrel can be reasonably distributed, ensuring the priority of performance on the basis of good processability of the lens.

[0067] In an exemplary embodiment, the optical imaging device satisfies: 1.2 < EP12 / SAG22 + SAG21 <1.8. Here, EP12 is the distance along the optical axis between the image side surface of the first spacer element and the object side surface of the second spacer element, SAG21 is the axial distance between the intersection of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens, and SAG22 is the axial distance between the intersection of the image side surface of the second lens and the optical axis and the vertex of the effective radius of the image side surface of the second lens. In other words, SAG21 and SAG22 are the front and rear sag heights of the second lens. By making the optical imaging device satisfy the above conditional expression, the distance between the second lens and the first lens and the front and rear sag heights of the second lens can be effectively ensured. For the lens disposed in the first lens barrel, the stability of the distance between the lenses and the assembly performance can be effectively ensured.

[0068] In an exemplary embodiment, the optical imaging device satisfies: -12 < d01m / SAG32 < -6. Here, d01m is the inner diameter of the image side end surface of the first lens barrel, and SAG32 is the axial distance between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens. Since the lens disposed in the first lens barrel is in an inverted manner, by controlling the relationship between the inner diameter of the image side end surface of the first lens barrel and the axial distance between the intersection of the image side surface of the third lens and the optical axis and the vertex of the effective radius of the image side surface of the third lens, the thickness of the front end of the first lens barrel can be effectively controlled, ensuring the stability of the assembly. In addition, the stray light at the exit hole of the first lens barrel can be improved, effectively intercepting the excess light from entering the lens disposed in the second lens barrel, and enhancing the imaging quality of the entire optical imaging device.

[0069] In an exemplary embodiment, the optical imaging device satisfies: 2.0 < EP024 / CT4 N4 < 3.0. Here, EP024 is the distance along the optical axis from the object side end surface of the second lens barrel to the object side surface of the fourth spacer element, CT4 is the central thickness of the fourth lens on the optical axis, and N4 is the refractive index of the fourth lens. By making the optical imaging device satisfy the above conditional expression, on the one hand, the central thickness of the fourth lens on the optical axis and the refractive index of the fourth lens can be reasonably allocated, thereby effectively ensuring the strength and processability of the fourth lens; on the other hand, the wall thickness of the front end of the second lens barrel can be ensured, effectively ensuring the strength of the lens barrel and the stability of the front end assembly support, and enhancing the performance stability of the lens disposed in the second lens barrel.

[0070] In an exemplary embodiment, the optical imaging device satisfies: ds02 < dm01. Here, dm01 is the minimum circular opening aperture of the image side of the first lens barrel, and ds02 is the minimum circular opening aperture of the object side of the second lens. Since the lens disposed in the first lens barrel is in an inverted manner, by making the optical imaging device satisfy the above conditional expression, the distance between the lens disposed in the first lens barrel and the lens disposed in the second lens barrel and the stability of the entire optical imaging device can be ensured.

[0071] In an exemplary embodiment, the spacer element group further includes a fourth spacer element disposed between the fourth lens and the fifth lens, and the optical imaging device satisfies: 1.0 < (CT4 + CT5) / (EP024 + CP4) < 1.8. Wherein, CT4 is the central thickness of the fourth lens on the optical axis, CT5 is the central thickness of the fifth lens on the optical axis, EP024 is the distance along the optical axis from the object-side end face of the second lens barrel to the object-side surface of the fourth spacer element, and CP4 is the maximum thickness of the fourth spacer element along the optical axis direction. By making the optical imaging device satisfy the above conditional formula, the central thicknesses of the fourth and fifth lenses on the optical axis can be reasonably controlled, and the thickness ratios of the fourth and fifth lenses to the mechanism thickness and adjacent spacer elements can be restricted, and the strength of the actual lens assembly can be improved, and the influence of the assembly deformation on the lens displacement and spatial gap can be reduced. In particular, during the normal assembly process, the field curvature can also be adjusted by adjusting the central thickness of the fourth lens on the optical axis to optimize the optical performance of the optical imaging device.

[0072] In an exemplary embodiment, the optical imaging device satisfies: 9 < EP024 / SAG41 + EP024 / SAG51 < 35. Wherein, EP024 is the distance along the optical axis from the object-side end face of the second lens barrel to the object-side surface of the fourth spacer element, SAG41 is the axial distance between the intersection point of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens, and SAG51 is the axial distance between the intersection point of the object-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fifth lens. In other words, SAG41 and SAG51 are respectively the front sag heights of the fourth lens and the fifth lens. By making the optical imaging device satisfy the above conditional formula, it can effectively ensure that the fourth lens does not protrude outside the lens barrel and cause appearance problems such as lens wear, and the performance stability of the lens disposed on the second lens barrel can be ensured by restricting the sag height tolerances of the fourth spacer element and the fifth lens.

[0073] In an exemplary embodiment, the optical imaging device satisfies: 3.0 < d4m / DT42 + d4m / DT51 < 4.5. Wherein, d4m is the inner diameter of the image-side surface of the fourth spacer element, DT42 is the maximum effective radius of the object-side surface of the fourth lens, and DT51 is the maximum effective radius of the object-side surface of the fifth lens. Lenses in the related art have a risk of generating internal reflection stray light, and by making the optical imaging device satisfy the above conditional formula, the excess light can be effectively blocked by controlling the aperture of the fourth spacer element, thereby improving the imaging quality of the optical imaging device and customer satisfaction.

[0074] In an exemplary embodiment, the optical imaging device satisfies: 8 < CT3 / CT2 (d01m / d2s) < 12. Wherein, CT2 is the central thickness of the second lens on the optical axis, CT3 is the central thickness of the third lens on the optical axis, d2s is the inner diameter of the object side surface of the second spacer element, and d01m is the inner diameter of the image side end surface of the first lens barrel. By making the optical imaging device satisfy the above conditional formula, the central thicknesses of the second lens and the third lens on the optical axis can be effectively controlled, so that the molding feasibility of the second lens and the third lens can be ensured; and the front inner diameter ratio of the second lens and the third lens to the first lens barrel and the inner diameter of the second spacer element can also be reasonably controlled. Furthermore, on the premise of ensuring that the optical system of the optical imaging device is not affected, redundant stray light brought by the mechanism can be avoided, thereby improving the imaging quality.

[0075] In an exemplary embodiment, the optical imaging device satisfies: 2.5 < d02m / DT52 < 3.3. Wherein, d02m is the inner diameter of the image side end surface of the second lens barrel, and DT52 is the maximum effective radius of the object side surface of the fifth lens. After the light passes through the fifth lens of the light lens barrel, that is, the last lens of the entire optical imaging device, it forms an image on the imaging surface. By controlling the optical imaging device to satisfy the above conditional formula, the situation where light directly hits the rear end of the lens barrel and causes stray light can be effectively avoided, which affects the imaging quality of the optical imaging device.

[0076] In an exemplary embodiment, at least one of the surfaces of each lens among the first lens to the fifth lens may be an aspherical surface. The characteristic of an aspherical lens is that the curvature continuously changes from the center of the lens to the periphery of the lens. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, the aberration that appears during imaging can be eliminated as much as possible, thereby improving the imaging quality. Optionally, both the object side surface and the image side surface of each lens among the first lens to the fifth lens are aspherical surfaces. In an exemplary embodiment, the incident surface and the exit surface of the reflecting element may also be aspherical surfaces.

[0077] Figure 12 A parameter annotation diagram of the optical imaging device according to the present application is shown, Figure 12 in which L02, D2s, d1s, d2s, EP12, D2m, d01m, dm01, ds02, d4m, L01, EP024, and CP4 are marked to facilitate clearly and intuitively understanding the meanings of these parameters.

[0078] Another aspect of the present application provides an optical imaging device, which includes: a reflecting element; an optical lens group including, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a negative optical power; and a spacer element group including at least a first spacer element, a second spacer element, and a fourth spacer element. The first spacer element is disposed between the first lens and the second lens and is in contact with the second lens; the second spacer element is placed between the second lens and the third lens and is in contact with the second lens; the fourth spacer element is disposed between the fourth lens and the fifth lens and is in contact with the fourth lens. The optical imaging device satisfies: 9 < EP024 / SAG41 + EP024 / SAG51 < 35, where EP024 is the axial distance from the object-side end face of the second lens barrel to the object-side surface of the fourth spacer element along the optical axis, SAG41 is the axial distance between the intersection point of the object-side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fourth lens, and SAG51 is the axial distance between the intersection point of the object-side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object-side surface of the fifth lens.

[0079] Another aspect of the present application provides an optical imaging device, which includes: a reflecting element; an optical lens group including, in order from the object side to the image side along the optical axis: a first lens with a positive optical power, a second lens with a negative optical power, a third lens with a positive optical power, a fourth lens with a negative optical power, and a fifth lens with a negative optical power; a lens barrel assembly including a first lens barrel and a second lens barrel, where the first lens, the second lens, and the third lens are disposed in the first lens barrel, and the fourth lens and the fifth lens are disposed in the second lens barrel; and a spacer element group including at least a first spacer element and a second spacer element. The first spacer element is disposed between the first lens and the second lens and is in contact with the second lens, and the second spacer element is placed between the second lens and the third lens and is in contact with the second lens. The optical imaging device satisfies: -3.5 < f45 / L02 < -2.0, where f45 is the combined focal length of the fourth lens and the fifth lens, and L02 is the axial distance from the object-side end face to the image-side end face of the second lens barrel along the optical axis.

[0080] Those skilled in the art should understand that, without departing from the technical solutions claimed in the present application, the number of lenses and spacer elements constituting the optical imaging device can be changed to obtain the various results and advantages described in this specification.

[0081] The following further describes specific embodiments of the optical imaging device applicable to the above embodiments with reference to the accompanying drawings.

[0082] Example 1

[0083] Refer to the following Figure 1 to describe the optical imaging device according to Embodiment 1 of the present application.

[0084] As Figure 1 shown, the optical imaging device includes a reflection element, an optical lens group, a spacer element group, and a lens barrel assembly.

[0085] The lens barrel assembly includes a first lens barrel P01 and a second lens barrel P02. The optical lens group includes a first lens E1 with a positive focal power, a second lens E2 with a negative focal power, a third lens E3 with a positive focal power, a fourth lens E4 with a negative focal power, and a fifth lens E5 with a negative focal power. Among them, the first lens E1, the second lens E2, and the third lens E3 are disposed in the first lens barrel P01, and the fourth lens E4 and the fifth lens E5 are disposed in the second lens barrel P02. The reflection element is disposed on the object side of the first lens E1. An aperture STO (not shown) can be disposed between the reflection element and the first lens E1.

[0086] Among them, the reflection element has an incident surface Z1 and an exit surface Z2. The incident surface Z1 is a convex surface, and the exit surface Z2 is a concave surface. The object side surface S1 of the first lens E1 is a convex surface, and the image side surface S2 is a concave surface. The object side surface S3 of the second lens E2 is a concave surface, and the image side surface S4 is a concave surface. The object side surface S5 of the third lens E3 is a convex surface, and the image side surface S6 is a convex surface. The object side surface S7 of the fourth lens E4 is a concave surface, and the image side surface S8 is a convex surface. The object side surface S9 of the fifth lens E5 is a convex surface, and the image side surface S10 is a concave surface. The protective glass or filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object sequentially passes through the surfaces Z1 to S12 and finally forms an image on the imaging surface S13 (not shown).

[0087] The spacer element group includes a first spacer element P1, a second spacer element P2, and a fourth spacer element P4. Among them, the first spacer element P1 is disposed between the first lens E1 and the second lens E2; the second spacer element P2 is placed between the second lens E2 and the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5.

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

[0089]

[0090] Table 1

[0091] In this embodiment, the focal length of the optical imaging device is changed by varying the distance of the lens disposed in the second lens barrel P02 relative to the lens disposed in the first lens barrel P01 along the optical axis. Therefore, the axial interval distance T1 between the image side S6 of the third lens E3 and the object side S7 of the fourth lens E4, and the axial interval distance T2 between the image side S10 of the fifth lens E5 and the object side S11 of the protective glass or filter are not fixed values.

[0092] In this embodiment, the two surfaces Z1 and Z2 of the reflective element, and the object side and image side of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface profiles of the respective aspherical lenses can be defined by, but not limited to, the following aspherical formula:

[0093] (1)

[0094] where is the sagitta of the aspherical surface at a position where the height along the optical axis is h , which is the distance from the vertex of the aspherical surface; 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 coefficient; Ai is the correction coefficient of the i -th order of the aspherical surface. Tables 2-1 and 2-2 give the higher-order term coefficients of the respective aspherical surfaces Z1-Z2, S1-S10 that can be used in Example 1 A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 .

[0095]

[0096] Table 2-1

[0097]

[0098] Table 2-2

[0099] Example 2

[0100] The following refers to Figure 2 to describe the optical imaging device according to Embodiment 2 of the present application.

[0101] As Figure 2As shown in the figure, the optical imaging device includes a reflective element, an optical lens group, a spacer element group, and a lens barrel assembly. Among them, the structures of the reflective element and the optical lens group in this embodiment are the same as those of the reflective element and the optical lens group in Embodiment 1. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Tables 2-1 and 2-2. The difference between this embodiment and Embodiment 1 lies in that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, and the spacer element group are different.

[0102] Example 3

[0103] The following refers to Figure 3 Describe the optical imaging device according to Embodiment 3 of the present application.

[0104] As Figure 3 shown in the figure, the optical imaging device includes a reflective element, an optical lens group, a spacer element group, and a lens barrel assembly. Among them, the structures of the reflective element and the optical lens group in this embodiment are the same as those of the reflective element and the optical lens group in Embodiment 1. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 1, and the aspheric coefficient table is the same as Tables 2-1 and 2-2. The difference between this embodiment and Embodiment 1 lies in that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, and the spacer element group are different.

[0105] Figure 4A shows the axial chromatic aberration curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the optical imaging device. Figure 4B shows the astigmatism curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 4C shows the distortion curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3, which represents the distortion magnitude values corresponding to different field angles. Figure 4D shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3, which represents the deviation of different image heights on the imaging plane after the light rays pass through the optical imaging device. According to Figures 4A to 4D it can be known that the optical imaging device of Embodiment 1, Embodiment 2, or Embodiment 3 can have good imaging quality.

[0106] Example 4

[0107] The following refers to Figure 13 Describe the optical imaging device according to Embodiment 4 of the present application.

[0108] As Figure 13 shown in the figure, the optical imaging device includes a reflective element, an optical lens group, a spacer element group, and a lens barrel.

[0109] The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The optical lens group includes a first lens E1 with a positive optical power, a second lens E2 with a negative optical power, a third lens E3 with a positive optical power, a fourth lens E4 with a negative optical power, and a fifth lens E5 with a negative optical power. Among them, the first lens E1, the second lens E2, and the third lens E3 are disposed in the first lens barrel P01, and the fourth lens E4 and the fifth lens E5 are disposed in the second lens barrel P02. The reflecting element is disposed on the object side of the first lens E1. The aperture STO (not shown) can be disposed between the reflecting element and the first lens E1.

[0110] Among them, the reflecting element has an incident surface Z1 and an exit surface Z2. The incident surface Z1 is a convex surface, and the exit surface Z2 is a concave surface. The object side surface S1 of the first lens E1 is a convex surface, and the image side surface S2 is a convex surface. The object side surface S3 of the second lens E2 is a concave surface, and the image side surface S4 is a concave surface. The object side surface S5 of the third lens E3 is a convex surface, and the image side surface S6 is a convex surface. The object side surface S7 of the fourth lens E4 is a concave surface, and the image side surface S8 is a convex surface. The object side surface S9 of the fifth lens E5 is a convex surface, and the image side surface S10 is a concave surface. The protective glass or filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object sequentially passes through the surfaces Z1 to S12 and finally forms an image on the imaging surface S13 (not shown).

[0111] The spacer element group includes a first spacer element P1, a second spacer element P2, and a fourth spacer element P4. Among them, the first spacer element P1 is disposed between the first lens E1 and the second lens E2; the second spacer element P2 is disposed between the second lens E2 and the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5.

[0112] Table 3 shows the basic parameter table of the optical imaging device of Embodiment 4, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0113]

[0114] Table 3

[0115] In this embodiment, the focal length of the optical imaging device is changed by changing the distance of the lens disposed in the second lens barrel P02 relative to the lens disposed in the first lens barrel P01 on the optical axis. Therefore, the axial interval distance T1 between the image side surface S6 of the third lens E3 and the object side surface S7 of the fourth lens E4, and the axial interval distance T2 from the image side surface S10 of the fifth lens E5 to the object side surface S11 of the protective glass or filter are not fixed values.

[0116] In this embodiment, both surfaces Z1 and Z2 of the reflection element, and the object side and image side of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface profiles of the respective aspherical lenses can be defined by using, but not limited to, the formula in Embodiment 1. Tables 4-1 and 4-2 give the high-order term coefficients of the respective aspherical surfaces Z1-Z2, S1-S10 in Embodiment 4 A4, A6, A8, A10, A12, A14, A16, A18, A20, A22 .

[0117]

[0118] Table 4-1

[0119]

[0120] Table 4-2

[0121] Example 5

[0122] The following refers to Figure 14 to describe the optical imaging device according to Embodiment 5 of the present application.

[0123] As Figure 14 shown, the optical imaging device includes a reflection element, an optical lens group, a spacer element group, and a lens barrel assembly. Among them, the structures of the reflection element and the optical lens group in this embodiment are the same as those of the reflection element and the optical lens group in Embodiment 4. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 3, and the aspherical coefficient table is the same as Tables 4-1 and 4-2. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, and the spacer element group are different.

[0124] Example 6

[0125] The following refers to Figure 15 to describe the optical imaging device according to Embodiment 6 of the present application.

[0126] As Figure 15 shown, the optical imaging device includes a reflection element, an optical lens group, a spacer element group, and a lens barrel assembly. Among them, the structures of the reflection element and the optical lens group in this embodiment are the same as those of the reflection element and the optical lens group in Embodiment 4. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 3, and the aspherical coefficient table is the same as Tables 4-1 and 4-2. The difference between this embodiment and Embodiment 4 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, and the spacer element group are different.

[0127] Figure 16AShows the axial chromatic aberration curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the optical imaging device. Figure 16B Shows the astigmatism curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 16C Shows the distortion curve of the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6, which represents the distortion magnitude values corresponding to different field angles. Figure 16D Shows the longitudinal chromatic aberration curve of the optical imaging device of Embodiment 4, Embodiment 5, and Embodiment 6, which represents the deviation of different image heights on the imaging plane after the light rays pass through the optical imaging device. According to Figures 16A to 16D It can be seen that the optical imaging device of Embodiment 4, Embodiment 5, or Embodiment 6 can have good imaging quality.

[0128] Example 7

[0129] The following refers to Figure 17 Describe the optical imaging device according to Embodiment 7 of the present application.

[0130] As Figure 17 Shown, the optical imaging device includes a reflective element, an optical lens group, a spacer element group, and a lens barrel.

[0131] The lens barrel includes a first lens barrel P01 and a second lens barrel P02. The optical lens group includes a first lens E1 with a positive focal power, a second lens E2 with a negative focal power, a third lens E3 with a positive focal power, a fourth lens E4 with a negative focal power, and a fifth lens E5 with a negative focal power. Among them, the first lens E1, the second lens E2, and the third lens E3 are arranged in the first lens barrel P01, and the fourth lens E4 and the fifth lens E5 are arranged in the second lens barrel P02. The reflective element is arranged on the object side of the first lens E1. An aperture STO (not shown) can be arranged between the reflective element and the first lens E1.

[0132] Among them, the reflective element has an incident surface Z1 and an exit surface Z2. The incident surface Z1 is a convex surface, and the exit surface Z2 is a concave surface. The object side surface S1 of the first lens E1 is a convex surface, and the image side surface S2 is a convex surface. The object side surface S3 of the second lens E2 is a concave surface, and the image side surface S4 is a concave surface. The object side surface S5 of the third lens E3 is a convex surface, and the image side surface S6 is a convex surface. The object side surface S7 of the fourth lens E4 is a concave surface, and the image side surface S8 is a convex surface. The object side surface S9 of the fifth lens E5 is a concave surface, and the image side surface S10 is a concave surface. The protective glass or filter has an object side surface S11 (not shown) and an image side surface S12 (not shown). The light from the object sequentially passes through the surfaces Z1 to S12 and finally forms an image on the imaging surface S13 (not shown).

[0133] The spacer element group includes a first spacer element P1, a second spacer element P2, and a fourth spacer element P4. Among them, the first spacer element P1 is disposed between the first lens E1 and the second lens E2; the second spacer element P2 is placed between the second lens E2 and the third lens E3; the fourth spacer element P4 is disposed between the fourth lens E4 and the fifth lens E5.

[0134] Table 5 shows the basic parameter table of the optical imaging device of Embodiment 7, where the units of the radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0135]

[0136] Table 5

[0137] In this embodiment, the focal length of the optical imaging device is changed by changing the distance of the lens disposed in the second lens barrel P02 relative to the lens disposed in the first lens barrel P01 on the optical axis. Therefore, the interval distance T1 along the optical axis between the image side S6 of the third lens E3 and the object side S7 of the fourth lens E4, and the interval distance T2 along the optical axis from the image side S10 of the fifth lens E5 to the object side S11 of the protective glass or filter are not fixed values.

[0138] In this embodiment, the two surfaces Z1 and Z2 of the reflecting element, and the object side and image side of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface profiles of the aspherical lenses can be defined by, but not limited to, the formula in Embodiment 1. Tables 6-1 and 6-2 give the higher-order term coefficients for the aspherical surfaces Z1-Z2, S1-S10 in Embodiment 7 A4, A6, A8, A10, A12, A14, A16, A18, A20 .

[0139]

[0140] Table 6-1

[0141]

[0142] Table 6-2

[0143] Example 8

[0144] The following refers to Figure 18 Describe the optical imaging device according to Embodiment 8 of the present application.

[0145] As Figure 18As shown in the figure, the optical imaging device includes a reflecting element, an optical lens group, a spacer element group, and a lens barrel assembly. Among them, the structures of the reflecting element and the optical lens group in this embodiment are the same as those of the reflecting element and the optical lens group in Embodiment 7. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, and the spacer element group are different.

[0146] Example 9

[0147] The following refers to Figure 19 Describe the optical imaging device according to Embodiment 9 of the present application.

[0148] As Figure 19 shown in the figure, the optical imaging device includes a reflecting element, an optical lens group, a spacer element group, and a lens barrel assembly. Among them, the structures of the reflecting element and the optical lens group in this embodiment are the same as those of the reflecting element and the optical lens group in Embodiment 7. That is, the basic parameter table of the optical imaging device in this embodiment is the same as Table 5, and the aspherical coefficient table is the same as Tables 6-1 and 6-2. The difference between this embodiment and Embodiment 7 is that the structural dimensions of at least some of the elements in the first lens barrel P01, the second lens barrel P02, and the spacer element group are different.

[0149] Figure 20A The axial chromatic aberration curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9 is shown, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the optical imaging device. Figure 20B The astigmatism curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 20C The distortion curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9 is shown, which represents the distortion magnitude values corresponding to different field angles. Figure 20D The longitudinal chromatic aberration curve of the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9 is shown, which represents the deviation of different image heights on the imaging plane after the light rays pass through the optical imaging device. According to Figures 20A to 20D it can be known that the optical imaging device of Embodiment 7, Embodiment 8, or Embodiment 9 can have good imaging quality.

[0150] Table 7 shows the values of the parameters in Embodiments 1-9. Among them, some of the above parameters can be measured according to Figure 10 the marking method shown, and the units of the parameters listed in Table 7 are all mm.

[0151]

[0152] Table 7

[0153] Table 8 shows the values of the conditional expressions in each state in Examples 1-3.

[0154]

[0155] Table 8

[0156] The above description is only for the preferred embodiments of the present application and the explanation of the applied technical principles. Those skilled in the art should understand that the scope of the invention 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 imaging device, characterized in that: include: Reflective element; An optical lens group, comprising a first lens with positive power, a second lens with negative power, a third lens with positive power, a fourth lens with negative power and a fifth lens with negative power, which are arranged in sequence from the object side to the image side along the optical axis; a spacer element group, comprising a first spacer element and a second spacer element, wherein the first spacer element is disposed between the first lens and the second lens and in contact with the second lens; and the second spacer element is disposed between the second lens and the third lens and in contact with the second lens; and Wherein, the optical imaging device satisfies: 2.0<Ry / d1s<7.0,-2.5<f2 / (D2s-2 DT21)<-1.4, Among them, f2 is the effective focal length of the second lens, Ry is the curvature radius of the exit surface of the reflecting element, d1s is the inner diameter of the object side surface of the first spacing element, D2s is the outer diameter of the object side surface of the second spacing element, and DT21 is the maximum effective radius of the object side surface of the second lens.

2. The optical imaging device according to claim 1, characterized in that: The optical imaging device satisfies: 0.4<(D2s-d2s) / DT22<0.8, Wherein, D2s is the outer diameter of the object side surface of the second spacing element, d2s is the inner diameter of the object side surface of the second spacing element, and DT22 is the maximum effective radius of the image side surface of the second lens.

3. The optical imaging device according to claim 1, characterized in that: The optical imaging device satisfies: 6.0< d2m / SAG31<8.0, Among them, SAG31 is the on-axis distance between the intersection of the object side surface of the third lens and the optical axis to the effective radius vertex of the object side surface of the third lens, and d2m is the inner diameter of the image side surface of the second spacing element.

4. The optical imaging device according to claim 1, characterized in that: The optical imaging device satisfies: 1.2 <EP12 / SAG22+SAG21 <1.8, Among them, EP12 is the spacing distance between the image side surface of the first spacing element and the object side surface of the second spacing element along the optical axis, SAG21 is the on-axis distance between the intersection of the object side surface of the second lens and the optical axis to the effective radius vertex of the object side surface of the second lens, and SAG22 is the on-axis distance between the intersection of the image side surface of the second lens and the optical axis to the effective radius vertex of the image side surface of the second lens.

5. The optical imaging device according to claim 1, characterized in that: The reflective element is a plastic prism with optical power.

6. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, wherein the lens barrel assembly comprises a first lens barrel and a second lens barrel, wherein the first lens, the second lens and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the optical imaging device satisfies: -3.5 <f45 / L02<-2.0, Wherein, f45 is the combined focal length of the fourth lens and the fifth lens, and L02 is the spacing distance from the object side end surface to the image side end surface of the second lens barrel along the optical axis.

7. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, wherein the lens barrel assembly comprises a first lens barrel and a second lens barrel, wherein the first lens, the second lens and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the optical imaging device satisfies: 1.3 <L01 / CT3<1.6, Wherein, L01 is the spacing distance from the object side end surface of the first lens barrel to the image side end surface thereof along the optical axis, and CT3 is the center thickness of the third lens on the optical axis.

8. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, wherein the lens barrel assembly comprises a first lens barrel and a second lens barrel, wherein the first lens, the second lens and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the optical imaging device satisfies: -12 <d01m / SAG32<-6, Among them, d01m is the inner diameter of the image side end surface of the first lens barrel, and SAG32 is the on-axis distance between the intersection of the image side surface of the third lens and the optical axis to the effective radius vertex of the image side surface of the third lens.

9. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, the lens barrel assembly comprises a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the spacer element group further comprises a fourth spacer element, the fourth spacer element is arranged between the fourth lens and the fifth lens and contacts the fourth lens; and the optical imaging device satisfies: 2.0<EP024 / CT4 N4<3.0, Among them, EP024 is the spacing distance from the object side end surface of the second lens barrel to the object side surface of the fourth spacing element along the optical axis, CT4 is the center thickness of the fourth lens on the optical axis, and N4 is the refractive index of the fourth lens.

10. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, the lens barrel assembly comprises a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the spacer element group further comprises a fourth spacer element, the fourth spacer element is arranged between the fourth lens and the fifth lens and contacts the fourth lens; and the optical imaging device satisfies: ds02 <dm01, Wherein, dm01 is the minimum circular opening aperture on the image side of the first lens barrel, and ds02 is the minimum circular opening aperture on the object side of the second lens barrel.

11. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, the lens barrel assembly comprises a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the spacer element group further comprises a fourth spacer element, the fourth spacer element is arranged between the fourth lens and the fifth lens and contacts the fourth lens; and the optical imaging device satisfies: 1.0<(CT4+CT5) / (EP024+CP4)<1.8, Among them, CT4 is the center thickness of the fourth lens on the optical axis, CT5 is the center thickness of the fifth lens on the optical axis, EP024 is the spacing distance from the object side end face of the second lens barrel to the object side face of the fourth spacing element along the optical axis, and CP4 is the maximum thickness of the fourth spacing element along the optical axis.

12. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, the lens barrel assembly comprises a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the spacer element group further comprises a fourth spacer element, the fourth spacer element is arranged between the fourth lens and the fifth lens and contacts the fourth lens; and the optical imaging device satisfies: 9<EP024 / SAG41 +EP024 / SAG51 <35, Among them, EP024 is the spacing distance from the object side end face of the second lens barrel to the object side face of the fourth spacing element along the optical axis, SAG41 is the on-axis distance between the intersection of the object side face of the fourth lens and the optical axis to the effective radius vertex of the object side face of the fourth lens, and SAG51 is the on-axis distance between the intersection of the object side face of the fifth lens and the optical axis to the effective radius vertex of the object side face of the fifth lens.

13. The optical imaging device according to any one of claims 1 to 5, characterized in that: The spacer element group further includes a fourth spacer element, which is disposed between the fourth lens and the fifth lens and in contact with the fourth lens, and the optical imaging device satisfies: 3.0 <d4m / DT42+d4m / DT51<4.5, Wherein, d4m is the inner diameter of the image side surface of the fourth spacing element, DT42 is the maximum effective radius of the image side surface of the fourth lens, and DT51 is the maximum effective radius of the object side surface of the fifth lens.

14. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, the lens barrel assembly comprises a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the spacer element group further comprises a fourth spacer element, the fourth spacer element is arranged between the fourth lens and the fifth lens and contacts the fourth lens; and the optical imaging device satisfies: 8<CT3 / CT2 (d01m / d2s)<12, Among them, CT2 is the center thickness of the second lens on the optical axis, CT3 is the center thickness of the third lens on the optical axis, d2s is the inner diameter of the object side of the second spacer element, and d01m is the inner diameter of the image side end surface of the first lens barrel.

15. The optical imaging device according to any one of claims 1 to 5, characterized in that: The optical imaging device further comprises a lens barrel assembly, the lens barrel assembly comprises a first lens barrel and a second lens barrel, the first lens, the second lens, and the third lens are arranged in the first lens barrel, and the fourth lens and the fifth lens are arranged in the second lens barrel; the spacer element group further comprises a fourth spacer element, the fourth spacer element is arranged between the fourth lens and the fifth lens and contacts the fourth lens; and the optical imaging device satisfies: 2.5 <d02m / DT52<3.3, Wherein, d02m is the inner diameter of the image side end surface of the second lens barrel, and DT52 is the maximum effective radius of the image side surface of the fifth lens.

Images