Optical imaging lens group

Abstract

The present application provides an optical imaging lens group, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object-side surface is convex; a second lens with optical power; a third lens with positive optical power, whose object-side surface is concave and whose image-side surface is convex; a fourth lens with optical power, whose object-side surface is convex and whose image-side surface is concave; wherein the spacing distance T23 between the second lens and the third lens on the optical axis, the spacing distance T12 between the first lens and the second lens on the optical axis, and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 1≤T23 / (T12+T34)<4; the optical imaging lens group also includes an infrared bandpass filter arranged between the fourth lens and the imaging surface of the optical imaging lens group; and at least one mirror surface from the object-side surface of the first lens to the image-side surface of the fourth lens is an aspherical surface.

Description

[0001] Divisional application statement

[0002] This application is a divisional application of the Chinese invention patent application filed on July 1, 2021, with the invention name “Optical imaging lens group” and application number 202110748396.8. Technical Field

[0003] The present application relates to the field of optical elements, and more specifically, to an optical imaging lens assembly. Background Art

[0004] In recent years, with the rapid development of portable electronic products such as smartphones, higher requirements have been placed on the shooting functions and imaging capabilities of the optical imaging lens groups installed in portable electronic products. In complex shooting environments, especially dim shooting environments, insufficient ambient light can limit the imaging of the optical imaging lens group, making it difficult to obtain clear images and achieve clear imaging effects. To achieve satisfactory imaging effects in dim environments, a method is usually adopted in which multiple shots are taken and the images are algorithmically synthesized. However, this method is algorithmically complex and can also result in a decrease in the final image resolution.

[0005] Therefore, it is urgent to provide an optical imaging lens assembly that can meet the requirements of shooting in dim environments. Summary of the Invention

[0006] The present application provides an optical imaging lens group, which includes, in order from the object side to the image side along the optical axis: a first lens with positive optical power, whose object-side surface is convex; a second lens with optical power; a third lens with positive optical power, whose object-side surface is concave and whose image-side surface is convex; a fourth lens with optical power, whose object-side surface is convex and whose image-side surface is concave; wherein the spacing distance T23 between the second lens and the third lens on the optical axis, the spacing distance T12 between the first lens and the second lens on the optical axis, and the spacing distance T34 between the third lens and the fourth lens on the optical axis satisfy: 1≤T23 / (T12+T34)<4; the optical imaging lens group also includes an infrared bandpass filter arranged between the fourth lens and the imaging surface of the optical imaging lens group; and at least one mirror surface from the object-side surface of the first lens to the image-side surface of the fourth lens is an aspherical surface.

[0007] In some embodiments, the maximum field of view FOV of the optical imaging lens assembly and the distance TTL on the optical axis from the object-side surface of the first lens to the imaging surface of the optical imaging lens assembly may satisfy: tan(FOV / 2) / TTL>0.3.

[0008] In some embodiments, half of the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens group and the total effective focal length f of the optical imaging lens group may satisfy: ImgH / f>1.

[0009] In some embodiments, a distance TTL from the object-side surface of the first lens to the imaging surface of the optical imaging lens assembly on the optical axis may satisfy: TTL≤3 mm.

[0010] In some embodiments, the central curvature radius R1 of the object-side surface of the first lens and the total effective focal length f of the optical imaging lens assembly may satisfy: <R1 / f<2。

[0011] In some embodiments, a central curvature radius R5 of the object-side surface of the third lens and a central curvature radius R6 of the image-side surface of the third lens may satisfy: 2<(R5+R6) / (R5-R6)<3.5.

[0012] In some embodiments, the distance T23 between the second lens and the third lens on the optical axis and the distance T34 between the third lens and the fourth lens on the optical axis may satisfy: <T23 / T34<10。

[0013] In some embodiments, the distance SAG32 from 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 on the optical axis and the center thickness CT3 of the third lens on the optical axis may satisfy: <SAG32 / CT3<-0.5。

[0014] In some embodiments, the distance SAG11 from the intersection of the object-side surface of the first lens and the optical axis to the vertex of the effective radius of the object-side surface of the first lens on the optical axis and the center thickness CT1 of the first lens on the optical axis may satisfy: <SAG11 / CT1<0.5。

[0015] In some embodiments, the center thickness CT2 of the second lens on the optical axis and the maximum effective semi-aperture DT22 of the image side surface of the second lens may satisfy: 0.1 <CT2 / DT22<0.5。

[0016] In some embodiments, the maximum effective semi-aperture DT11 of the object-side surface of the first lens and half the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens assembly may satisfy: <DT11 / ImgH<0.3。

[0017] In some embodiments, the maximum effective semi-aperture DT42 of the image-side surface of the fourth lens and the maximum effective semi-aperture DT32 of the image-side surface of the third lens may satisfy the following: 0.3<(DT42−DT32) / DT42<0.6.

[0018] In some embodiments, the center thickness CT12 of the first lens on the optical axis and the center thickness CT2 of the second lens on the optical axis may satisfy: 1.5 <CT1 / CT2<3。

[0019] In some embodiments, the center thickness CT3 of the third lens on the optical axis and the spacing distance T34 between the third lens and the fourth lens on the optical axis may satisfy: 15 <CT3 / T34<20。

[0020] In some embodiments, the edge thickness ET2 of the second lens at the maximum effective diameter and the edge thickness ET3 of the third lens at the maximum effective diameter may satisfy: 1 <ET2 / ET3<1.5。

[0021] In some embodiments, the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis and half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens group ImgH may satisfy: TTL / ImgH<1.6.

[0022] In some embodiments, the maximum effective half-aperture DT11 of the object-side surface of the first lens and the maximum effective half-aperture DT21 of the object-side surface of the second lens may satisfy: 0.6 <DT11 / DT21<1。

[0023] In some embodiments, the distance SAG31 from 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 on the optical axis and the spacing distance T23 between the second lens and the third lens on the optical axis may satisfy: -0.7 <SAG31 / T23<-0.1。

[0024] In some embodiments, the distance SAG21 from the intersection of the object-side surface of the second lens and the optical axis to the vertex of the effective radius of the object-side surface of the second lens on the optical axis and the distance SAG22 from the intersection of the image-side surface of the second lens and the optical axis to the vertex of the effective radius of the image-side surface of the second lens on the optical axis may satisfy: <SAG21 / SAG22<0。

[0025] In some embodiments, the image-side surface of the second lens element may be convex.

[0026] In some embodiments, the central curvature radius R4 of the image side surface of the second lens and the total effective focal length f of the optical imaging lens assembly may satisfy: 0.5 <R4 / f<1.5。

[0027] In some embodiments, the object-side surface and the image-side surface of the infrared bandpass filter may be provided with an infrared high-transmittance film or a visible light cutoff film.

[0028] In some embodiments, at least one of the mirror surfaces from the object side surface of the first lens to the image side surface of the fourth lens may be provided with an infrared high-transmittance film or a visible light cutoff film.

[0029] In some embodiments, the transmittance of the infrared high-transmittance film in the infrared band range of 740nm-1100nm can be greater than 98%; the reflectivity of the visible light cutoff film in the visible band range of 380nm-720nm is greater than 0, and the reflectivity in the visible band range of 420nm-590nm is greater than 20%.

[0030] The present application adopts a four-piece optical imaging lens group architecture. By reasonably allocating the optical focal length, surface shape, center thickness of each lens, and on-axis spacing between each lens, the above-mentioned optical imaging lens group has at least one beneficial effect such as a large aperture, a large image surface, and good imaging effect in dim shooting environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Other features, purposes and advantages of the present application will become more apparent through the following detailed description of non-limiting embodiments in conjunction with the accompanying drawings. In the accompanying drawings:

[0032] Figure 1 1 shows a schematic structural diagram of an optical imaging lens assembly according to Example 1 of the present application;

[0033] Figure 2 The transmittance curve of the infrared high-transmittance film of Example 1 of the present application is shown;

[0034] Figure 3 shows the reflectivity curve of the visible light cutoff film of Example 1 of the present application;

[0035] Figures 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens assembly of Example 1 are respectively shown;

[0036] Figure 5 1 shows a schematic structural diagram of an optical imaging lens assembly according to Example 2 of the present application;

[0037] 6A to 6D The axial chromatic aberration curve, astigmatism curve, distortion curve, and lateral chromatic aberration curve of the optical imaging lens assembly of Example 2 are respectively shown;

[0038] Figure 7 shows a schematic structural diagram of an optical imaging lens assembly according to Example 3 of the present application; and

[0039] Figures 8A to 8D The axial chromatic aberration curve, astigmatism curve, distortion curve and lateral chromatic aberration curve of the optical imaging lens group of Example 3 are respectively shown. DETAILED DESCRIPTION

[0040] For a better understanding of 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 merely descriptions of exemplary embodiments of the present application and are not intended to limit the scope of the present application in any way. Throughout the specification, the same reference numerals refer to the same elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0041] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0042] In the drawings, the thickness, size, and shape of the lenses are slightly exaggerated for ease of illustration. Specifically, the shapes of the spherical and aspherical surfaces shown in the drawings are provided by way of example. That is, the shapes of the spherical and aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0043] In this article, the paraxial region refers to the area near the optical axis. If a lens surface is convex and the location of the convex surface is undefined, it means that the lens surface is convex at least in the paraxial region. If a lens surface is concave and the location of the concave surface is undefined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the subject is called the object-side surface of the lens, and the surface of each lens closest to the imaging plane is called the image-side surface of the lens.

[0044] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application." And, the term "exemplary" is intended to refer to an example or illustration.

[0045] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which this application belongs. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless expressly defined as such herein.

[0046] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application 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.

[0047] The features, principles and other aspects of the present application are described in detail below.

[0048] The optical imaging lens assembly according to an exemplary embodiment of the present application may include, for example, four lenses having optical power: a first lens, a second lens, a third lens, and a fourth lens. These four lenses are arranged sequentially along the optical axis from the object side to the image side. Among the first through fourth lenses, any two adjacent lenses may have an air gap between them.

[0049] In an exemplary embodiment, the first lens may have positive optical power, and its object-side surface may be convex; the second lens may have positive optical power or negative optical power; the third lens may have positive optical power, its object-side surface may be concave, and its image-side surface may be convex; the fourth lens may have positive optical power or negative optical power, its object-side surface may be convex, and its image-side surface may be concave.

[0050] In an exemplary embodiment, the optical imaging lens assembly may satisfy TTL / ImgH < 1.6, where TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical imaging lens assembly, and ImgH is half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens assembly. This TTL / ImgH < 1.6 requirement allows the optical imaging lens assembly to have a large aperture structure, which helps increase the amount of light entering the optical imaging lens assembly and improve the overall illumination of the optical imaging lens assembly.

[0051] In an exemplary embodiment, the optical imaging lens assembly may satisfy tan(FOV / 2) / TTL>0.3, where TTL is the distance on the optical axis from the object-side surface of the first lens to the imaging surface of the optical imaging lens assembly, and FOV is the maximum field of view of the optical imaging lens assembly. This tan(FOV / 2) / TTL>0.3 condition allows the optical imaging lens assembly to have a large image plane. Given the same pixel size of the photosensitive element, the imaging surface can have more pixels, resulting in a clearer image and enhanced imaging quality.

[0052] In an exemplary embodiment, the optical imaging lens group may satisfy ImgH / f > 1, where ImgH is half of the diagonal length of the effective pixel area of the photosensitive element on the imaging surface of the optical imaging lens group, and f is the total effective focal length of the optical imaging lens group. The optical imaging lens group satisfying ImgH / f > 1 can effectively compress the size of the entire optical imaging lens group, ensure that the optical imaging lens group has a compact structure, and is conducive to meeting the processing and installation requirements. In addition, it can also enable the optical imaging lens group to further meet the requirements of a large aperture, allowing more light to enter the optical imaging lens group and improving the imaging quality.

[0053] In an exemplary embodiment, the optical imaging lens group may satisfy TTL ≤ 3 mm, where TTL is the distance on the optical axis from the object side surface of the first lens to the imaging surface of the optical imaging lens group. The optical imaging lens group satisfying TTL ≤ 3 mm can effectively reduce the overall length of the optical imaging lens group and is conducive to meeting the installation requirements.

[0054] In an exemplary embodiment, the optical imaging lens group may satisfy 0 < R1 / f < 2, where R1 is the central curvature radius of the object side surface of the first lens, and f is the total effective focal length of the optical imaging lens group. The optical imaging lens group satisfying 0 < R1 / f < 2 can control the deflection angle of the marginal field of view on the first lens, effectively reduce the sensitivity of the optical imaging lens group, and thus improve the yield rate of the optical imaging lens group. More specifically, R1 and f may satisfy 0.2 < R1 / f < 1.8.

[0055] In an exemplary embodiment, the optical imaging lens group may satisfy 2 < (R5 + R6) / (R5 - R6) < 3.5, where R5 is the central curvature radius of the object side surface of the third lens, and R6 is the central curvature radius of the image side surface of the third lens. The optical imaging lens group satisfying 2 < (R5 + R6) / (R5 - R6) < 3.5 can control the deflection angle of the outer field of view light on the third lens, effectively reduce the sensitivity of the optical imaging lens group, and thus improve the yield rate of the optical imaging lens group. More specifically, R5 and R6 may satisfy 2.1 < (R5 + R6) / (R5 - R6) < 3.2.

[0056] In an exemplary embodiment, the optical imaging lens group may satisfy 3 < T23 / T34 < 10, where T23 is the distance between the second lens and the third lens on the optical axis, and T34 is the distance between the third lens and the fourth lens on the optical axis. The optical imaging lens group satisfying 3 < T23 / T34 < 10 helps to appropriately shorten the total length of the optical imaging lens group. While achieving the large-aperture characteristic, the requirement that the optical imaging lens group has a short total length is satisfied. At the same time, it is beneficial to adjust the structure of the optical imaging lens group and reduce the difficulty of lens processing and assembly. More specifically, T23 and T34 may satisfy: 3.1 < T23 / T34 < 9.5.

[0057] In an exemplary embodiment, the optical imaging lens group may satisfy -1 < SAG32 / CT3 < -0.5, where SAG32 is the distance from the intersection of the image side surface of the third lens and the optical axis to the vertex of the effective radius of the image side surface of the third lens on the optical axis, and CT3 is the central thickness of the third lens on the optical axis. The optical imaging lens group satisfying -1 < SAG32 / CT3 < -0.5 can reasonably control the surface shape of the third lens, thereby controlling the spherical aberration and coma of the entire optical imaging lens group and ensuring the imaging quality of the entire optical imaging lens group. More specifically, SAG32 and CT3 may satisfy: -0.9 < SAG32 / CT3 < -0.6.

[0058] In an exemplary embodiment, the optical imaging lens group may satisfy 0 < SAG11 / CT1 < 0.5, where SAG11 is the distance from the intersection of the object side surface of the first lens and the optical axis to the vertex of the effective radius of the object side surface of the first lens on the optical axis, and CT1 is the central thickness of the first lens on the optical axis. The optical imaging lens group satisfying 0 < SAG11 / CT1 < 0.5 can reasonably control the surface shape of the first lens, thereby controlling the spherical aberration and coma of the entire optical imaging lens group and ensuring the imaging quality of the entire optical imaging lens group. More specifically, SAG11 and CT1 may satisfy: 0 < SAG11 / CT1 < 0.4.

[0059] In an exemplary embodiment, the optical imaging lens group may satisfy 0.1 < CT2 / DT22 < 0.5, where CT2 is the central thickness of the second lens on the optical axis, and DT22 is the maximum effective semi-aperture of the image side surface of the second lens. The optical imaging lens group satisfying 0.1 < CT2 / DT22 < 0.5 can reasonably control the surface shape of the second lens, reduce the sensitivity of the second lens, and ensure the processability of the second lens. At the same time, it is beneficial to adjust the structure of the optical imaging lens group and reduce the difficulty of lens processing and assembly. More specifically, CT2 and DT22 may satisfy: 0.2 < CT2 / DT22 < 0.4.

[0060] In an exemplary embodiment, the optical imaging lens group may satisfy 0 < DT11 / ImgH < 0.3, where DT11 is the maximum effective semi-aperture of the object side surface of the first lens, and ImgH is half of the diagonal length of the effective pixel region of the photosensitive element on the imaging surface of the optical imaging lens group. The optical imaging lens group satisfying 0 < DT11 / ImgH < 0.3 can effectively compress the size of the optical imaging lens group, ensure the compact structure of the optical imaging lens group, and meet the requirement of a shorter overall length of the optical imaging lens group. More specifically, DT11 and ImgH may satisfy: 0.1 < DT11 / ImgH < 0.3.

[0061] In an exemplary embodiment, the optical imaging lens group may satisfy 0.3 < (DT42 - DT32) / DT42 < 0.6, where DT42 is the maximum effective semi-aperture of the image side surface of the fourth lens, and DT32 is the maximum effective semi-aperture of the image side surface of the third lens. The optical imaging lens group satisfying 0.3 < (DT42 - DT32) / DT42 < 0.6 can increase the light passing amount of the entire optical imaging lens group, improve the overall illuminance of the optical imaging lens group, and enhance the imaging effect. More specifically, DT42 and DT32 may satisfy: 0.4 < (DT42 - DT32) / DT42 < 0.5.

[0062] In an exemplary embodiment, the optical imaging lens group may satisfy 1.5 < CT1 / CT2 < 3, where CT1 is the central thickness of the first lens on the optical axis, and CT2 is the central thickness of the second lens on the optical axis. The optical imaging lens group satisfying 1.5 < CT1 / CT2 < 3 can effectively reduce the marginal ray angles of the first lens and the second lens, reduce the sensitivity of the entire optical imaging lens group, and thus improve the yield rate of the optical imaging lens group.

[0063] In an exemplary embodiment, the optical imaging lens group may satisfy 15 < CT3 / T34 < 20, where CT3 is the central thickness of the third lens on the optical axis, and T34 is the spacing distance between the third lens and the fourth lens on the optical axis. The optical imaging lens group satisfying 15 < CT3 / T34 < 20 can effectively reduce the thickness sensitivity of the optical imaging lens group, which is beneficial for correcting field curvature.

[0064] In an exemplary embodiment, the optical imaging lens group may satisfy 1 < ET2 / ET3 < 1.5, where ET2 is the edge thickness of the second lens at the maximum effective diameter, and ET3 is the edge thickness of the third lens at the maximum effective diameter. The optical imaging lens group satisfying 1 < ET2 / ET3 < 1.5 is beneficial for the injection molding of the lens, improves the processability of the entire optical imaging lens group, and at the same time ensures good imaging quality.

[0065] In an exemplary embodiment, the optical imaging lens group may satisfy 1≤T23 / (T12+T34)<4, where T23 is the distance between the second lens and the third lens on the optical axis, T12 is the distance between the first lens and the second lens on the optical axis, and T34 is the distance between the optical imaging lens group on the optical axis. The optical imaging lens group satisfying 1≤T23 / (T12+T34)<4 can effectively reduce the thickness sensitivity of the optical imaging lens group and is beneficial to correcting field curvature.

[0066] In an exemplary embodiment, the image side surface of the second lens may be concave. By adopting this surface type setting method, the sensitivity of the second lens can be effectively controlled, and the overall yield of the optical imaging lens group can be improved.

[0067] In an exemplary embodiment, the optical imaging lens group may satisfy 0.6<DT11 / DT21<1, where DT11 is the maximum effective semi-aperture of the object side surface of the first lens, and DT21 is the maximum effective semi-aperture of the object side surface of the second lens. The optical imaging lens group satisfying 0.6<DT11 / DT21<1 can effectively increase the light transmission amount of the optical imaging lens group, improve the relative illumination of the edge field of view, and enable the optical imaging lens group to have better imaging quality in a darker environment.

[0068] In an exemplary embodiment, the optical imaging lens group satisfies -0.7<SAG31 / T23<-0.1, where SAG31 is the distance on the optical axis from the intersection of the object side surface of the third lens and the optical axis to the vertex of the effective radius of the object side surface of the third lens, and T23 is the distance between the second lens and the third lens on the optical axis. The optical imaging lens group satisfying -0.7<SAG31 / T23<-0.1 helps to adjust the chief ray angle of the entire optical imaging lens group, thereby improving the relative brightness of the optical imaging lens group and being beneficial to improving imaging clarity. More specifically, SAG31 and T23 may satisfy -0.6<SAG31 / T23<-0.2.

[0069] In an exemplary embodiment, the optical imaging lens group satisfies -3<SAG21 / SAG22<0, where SAG21 is the distance on the optical axis from the intersection of the object side surface of the second lens and the optical axis to the vertex of the effective radius of the object side surface of the second lens, and SAG22 is the distance on the optical axis from the intersection of the image side surface of the second lens and the optical axis to the vertex of the effective radius of the image side surface of the second lens. The optical imaging lens group satisfying -3<SAG21 / SAG22<0 can control the deflection angle of the light ray at the second lens, effectively reduce the sensitivity of the overall optical imaging lens group, and thus improve the yield of the optical imaging lens group.

[0070] In an exemplary embodiment, the optical imaging lens group satisfies 0.5 < R4 / f < 1.5, where R4 is the central radius of curvature of the image side of the second lens, and f is the total effective focal length of the optical imaging lens group. The optical imaging lens group satisfying 0.5 < R4 / f < 1.5 can effectively control the deflection angle of the marginal field of view at the second lens, thereby reducing the sensitivity of the entire optical imaging lens group. More specifically, R4 and f may satisfy 0.6 < R4 / f < 1.3.

[0071] In an exemplary embodiment, the optical imaging lens group further includes an infrared band-pass filter disposed between the fourth lens and the imaging surface of the optical imaging lens group. The infrared band-pass filter can filter out visible light in a normal shooting environment to remove the influence of ghost images. The visible light can be captured by another optical imaging lens group, and this optical imaging lens group collects the infrared light in the shooting environment as much as possible, thereby enhancing the light input amount of the entire optical imaging lens group without reducing any performance and improving the imaging quality.

[0072] In an exemplary embodiment, an infrared high-transmission film or a visible light cut-off film is provided on the object side and the image side of the infrared band-pass filter. This setting method can reflect and absorb visible light, thereby achieving the filtering of visible light and achieving a high transmittance and a low reflectance of infrared light. An infrared high-transmission film or a visible light cut-off film is provided on at least one mirror surface from the object side of the first lens to the image side of the fourth lens. This setting method can achieve the effect of reflecting about 40% and absorbing about 50% of visible light, and further achieve a high transmittance and a low reflectance of infrared light. By reasonably controlling the combination of the infrared high-transmission film and the visible light cut-off film, visible light can be effectively absorbed or reflected, thereby avoiding the influence of visible light on the optical imaging lens group and the influence of ghost images generated by visible light on the optical imaging lens group. At the same time, by enhancing the transmittance of infrared light, the light input amount can be increased, so that the optical imaging lens group obtains more illuminance, thereby achieving the purpose of enhancing the imaging quality in a dim environment.

[0073] In an exemplary embodiment, the transmittance of the infrared high-transmission film in the range of 740 nm - 1100 nm of the infrared band is greater than 98%; the reflectance of the visible light cut-off film in the range of 380 nm - 720 nm of the visible band is greater than 0, and the reflectance in the range of 420 nm - 590 nm of the visible band is greater than 20%.

[0074] In an exemplary embodiment, the above optical imaging lens group may further include at least one aperture stop. The aperture stop can be set at an appropriate position as needed. For example, it can be set between the object side and the first lens, or between the first lens and the second lens.

[0075] In an exemplary embodiment, the optical imaging lens assembly may further include a filter for correcting color deviation and / or a protective glass for protecting a photosensitive element located on the imaging surface.

[0076] In an exemplary embodiment, at least one of the first through fourth lenses may be a glass lens. Glass materials have a low thermal expansion coefficient and are less affected by ambient temperature. By properly combining the materials of the various lenses, the optical imaging lens assembly can maintain high resolution over a wide temperature range.

[0077] The optical imaging lens assembly according to the above-described embodiment of the present application can utilize multiple lenses, such as the four lenses described above. By rationally allocating the optical power, surface shape, center thickness of each lens, and on-axis spacing between lenses, the volume of the optical imaging lens assembly can be effectively reduced, the sensitivity of the optical imaging lens assembly can be reduced, and the processability of the optical imaging lens assembly can be improved, making the optical imaging lens assembly more amenable to production and processing and suitable for use in portable electronic products. The optical imaging lens assembly according to the embodiment of the present application also has at least one beneficial effect, including a large aperture, a large image area, and excellent imaging quality in dim shooting environments.

[0078] In an embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface, that is, at least one of the object side surface of the first lens to the image side surface of the fourth lens is an aspherical mirror surface. The characteristic of an aspherical lens is that the curvature changes continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better curvature radius characteristic, and has the advantages of improving distortion aberration and improving astigmatism aberration. After adopting an aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving imaging quality. Optionally, at least one of the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens and the fourth lens is an aspherical mirror surface. Optionally, the object side surface and the image side surface of each lens in the first lens, the second lens, the third lens and the fourth lens are all aspherical mirror surfaces.

[0079] However, those skilled in the art will appreciate that, without departing from the technical solutions claimed in this application, the number of lenses comprising the optical imaging lens assembly can be varied to achieve the various results and advantages described herein. For example, although four lenses are described as an example in the embodiments, the optical imaging lens assembly is not limited to four lenses. If desired, the optical imaging lens assembly can also include other numbers of lenses.

[0080] Specific embodiments of the optical imaging lens assembly applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0081] Example 1

[0082] The following reference Figures 1 to 4D The optical imaging lens assembly according to Example 1 of the present application is described. Figure 1 A schematic structural diagram of an optical imaging lens assembly according to Example 1 of the present application is shown.

[0083] like Figure 1 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and an infrared bandpass filter E5.

[0084] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The infrared bandpass filter E5 has an object-side surface S9 and an image-side surface S10. The optical imaging lens group has an imaging surface S11, and light from an object sequentially passes through each surface S1 to S10 and is ultimately imaged on the imaging surface S11. The infrared bandpass filter E5 can improve the high transmittance and low reflectivity of infrared light.

[0085] Figure 2 The transmittance curve of the infrared high-transmittance film of Example 1 of the present application is shown. Figure 3 The reflectivity curve of the visible light cutoff film of Example 1 of the present application is shown. The object side surface S9 and the image side surface S10 of the infrared bandpass filter E5 can be provided with an infrared high-transmittance film or a visible light cutoff film, and at least one mirror surface from the object side surface S1 of the first lens E1 to the image side surface S8 of the fourth lens E4 can be provided with an infrared high-transmittance film or a visible light cutoff film. Figures 2 to 3 As shown, the transmittance of the infrared high-transmittance film in the infrared band range of 740nm-1100nm can be greater than 98%, the reflectivity of the visible light cutoff film in the visible band range of 380nm-720nm is greater than 0, and the reflectivity in the visible band range of 420nm-590nm is greater than 20%.

[0086] Table 1 shows the basic parameters of the optical imaging lens assembly of Example 1, where the units of curvature radius, thickness and focal length are all in millimeters (mm).

[0087]

[0088]

[0089] Table 1

[0090] In Example 1, the total effective focal length f of the optical imaging lens assembly is 1.78 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 2.81 mm, the maximum field of view FOV of the optical imaging lens assembly is 92.9°, and half the diagonal length of the effective pixel area on the imaging surface S11, ImgH, is 1.91 mm.

[0091] In Example 1, the object-side surface and the image-side surface of any lens among the first lens E1 to the fourth lens E4 are both aspherical surfaces. The surface shape x of each aspherical lens can be defined by, but is not limited to, the following aspherical surface formula:

[0092]

[0093] Where x is the distance vector from the vertex of the aspheric surface at a height of h along the optical axis; c is the paraxial curvature of the aspheric 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 for the i-th order of the aspheric surface. Table 2 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A20, A22, and A24 that can be used for each aspheric mirror surface S1 to S8 in Example 1.

[0094]

[0095] Table 2

[0096] Figure 4A The axial chromatic aberration curve of the optical imaging lens assembly of Example 1 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Figure 4B The astigmatism curve of the optical imaging lens group of Example 1 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the optical imaging lens assembly of Example 1 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 4D The chromatic aberration curve of the optical imaging lens assembly of Example 1 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens assembly. Figures 4A to 4D It can be seen that the optical imaging lens assembly provided in Example 1 can achieve good imaging quality.

[0097] Example 2

[0098] The following reference Figures 5 to 6D The optical imaging lens assembly according to Example 2 of the present application is described. In this embodiment and the following embodiments, some descriptions similar to those in Example 1 will be omitted for the sake of brevity. Figure 5 A schematic structural diagram of an optical imaging lens assembly according to Example 2 of the present application is shown.

[0099] like Figure 5 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and an infrared bandpass filter E5.

[0100] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens E2 has negative focal power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The infrared bandpass filter E5 has an object-side surface S9 and an image-side surface S10. The optical imaging lens group has an imaging surface S11, and light from an object sequentially passes through each surface S1 to S10 and is ultimately imaged on the imaging surface S11. The infrared bandpass filter E5 can improve the high transmittance and low reflectivity of infrared light.

[0101] The object-side surface S9 and image-side surface S10 of the infrared bandpass filter E5 may be provided with an infrared high-transmittance film or a visible light-cutting film. At least one of the mirror surfaces from the object-side surface S1 of the first lens element E1 to the image-side surface S8 of the fourth lens element E4 may be provided with an infrared high-transmittance film or a visible light-cutting film. The infrared high-transmittance film and the visible light-cutting film may be defined by the transmittance and reflectance curves described in Example 1. The infrared high-transmittance film may have a transmittance greater than 98% within the infrared wavelength range of 740nm-1100nm. The visible light-cutting film may have a reflectance greater than 0 within the visible wavelength range of 380nm-720nm and a reflectance greater than 20% within the visible wavelength range of 420nm-590nm.

[0102] In Example 2, the total effective focal length f of the optical imaging lens assembly is 1.78 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 2.79 mm, the maximum field of view FOV of the optical imaging lens assembly is 92.8°, and half the diagonal length of the effective pixel area on the imaging surface S11, ImgH, is 1.91 mm.

[0103] Table 3 shows the basic parameters of the optical imaging lens assembly of Example 2, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, and A20 that can be used for each aspheric mirror surface in Example 2, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0104]

[0105] Table 3

[0106]

[0107]

[0108] Table 4

[0109] Figure 6A The axial chromatic aberration curve of the optical imaging lens assembly of Example 2 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Figure 6B The astigmatism curve of the optical imaging lens group of Example 2 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 6C The distortion curve of the optical imaging lens assembly of Example 2 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 6D The chromatic aberration curve of the optical imaging lens assembly of Example 2 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens assembly. Figure 6A Figure 6D It can be seen that the optical imaging lens assembly provided in Example 2 can achieve good imaging quality.

[0110] Example 3

[0111] The following reference Figures 7 to 8D An optical imaging lens assembly according to Example 3 of the present application is described. Figure 7 A schematic structural diagram of an optical imaging lens assembly according to Example 3 of the present application is shown.

[0112] like Figure 7 As shown, the optical imaging lens group includes, from the object side to the image side along the optical axis, an aperture STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4 and an infrared bandpass filter E5.

[0113] The first lens E1 has positive focal power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens E2 has positive focal power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens E3 has positive focal power, with its object-side surface S5 being concave and its image-side surface S6 being convex. The fourth lens E4 has negative focal power, with its object-side surface S7 being convex and its image-side surface S8 being concave. The infrared bandpass filter E5 has an object-side surface S9 and an image-side surface S10. The optical imaging lens group has an imaging surface S11, and light from an object sequentially passes through each surface S1 to S10 and is ultimately imaged on the imaging surface S11. The infrared bandpass filter E5 can improve the high transmittance and low reflectivity of infrared light.

[0114] The object-side surface S9 and image-side surface S10 of the infrared bandpass filter E5 may be provided with an infrared high-transmittance film or a visible light-cutting film. At least one of the mirror surfaces from the object-side surface S1 of the first lens element E1 to the image-side surface S8 of the fourth lens element E4 may be provided with an infrared high-transmittance film or a visible light-cutting film. The infrared high-transmittance film and the visible light-cutting film may be defined by the transmittance and reflectance curves described in Example 1. The infrared high-transmittance film may have a transmittance greater than 98% within the infrared wavelength range of 740nm-1100nm. The visible light-cutting film may have a reflectance greater than 0 within the visible wavelength range of 380nm-720nm and a reflectance greater than 20% within the visible wavelength range of 420nm-590nm.

[0115] In Example 3, the total effective focal length f of the optical imaging lens assembly is 1.88 mm, the distance TTL on the optical axis from the object-side surface S1 of the first lens element E1 to the imaging surface S11 is 2.94 mm, the maximum field of view FOV of the optical imaging lens assembly is 90.2°, and half the diagonal length of the effective pixel area on the imaging surface S11, ImgH, is 1.91 mm.

[0116] Table 5 shows the basic parameters of the optical imaging lens assembly of Example 3, where the units of curvature radius, thickness, and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A20, A22, A24, A26, A28, and A30 of the aspheric mirror surfaces that can be used in Example 3, where the surface shape of each aspheric surface can be defined by formula (1) given in Example 1 above.

[0117]

[0118]

[0119] Table 5

[0120] Face number A4 A6 A8 A10 A12 A14 A16 S1 -2.2209E-03 -1.5451E-03 -1.7782E-04 -3.2200E-05 -1.3934E-05 -5.3349E-06 -1.3275E-06 S2 -5.9323E-02 -2.6278E-03 4.4026E-04 1.6784E-04 1.4431E-05 -1.1740E-07 -6.8493E-06 S3 -1.0855E-01 -3.5584E-03 3.7246E-03 1.0500E-03 -1.6098E-04 -7.9761E-05 -1.3100E-05 S4 -6.6639E-02 -4.1158E-03 2.3544E-03 -6.0959E-05 9.2118E-05 7.1881E-05 2.2697E-05 S5 1.4727E-01 -1.3651E-03 -5.4869E-03 -2.5383E-03 5.4357E-04 -3.6526E-04 -9.5563E-05 S6 -2.2874E-01 1.3070E-01 -2.3696E-02 3.2851E-04 -5.0114E-03 2.6556E-03 -2.5263E-05 S7 -1.3421E+00 3.3195E-01 -1.0174E-01 3.0770E-02 -9.3983E-03 5.0383E-03 -1.6214E-03 S8 -2.7089E+00 5.0829E-01 -1.7239E-01 6.0834E-02 -2.7902E-02 1.1345E-02 -4.5666E-03 Face number A18 A20 A22 A24 A26 A28 A30 S1 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S2 2.5489E-07 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S3 1.5897E-05 -7.1672E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S4 3.5029E-07 -3.3387E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S5 2.7082E-05 7.0463E-06 6.2286E-06 0.0000E+00 0.0000E+00 0.0000E+00 0.0000E+00 S6 2.5123E-04 -2.5333E-04 2.5520E-05 6.6600E-06 0.0000E+00 0.0000E+00 0.0000E+00 S7 2.6812E-04 -2.9313E-04 1.0552E-04 3.9091E-05 -1.3977E-05 0.0000E+00 0.0000E+00 S8 3.1306E-03 -8.8802E-04 4.7393E-04 -2.5805E-04 1.0625E-04 3.0017E-06 -1.7923E-05

[0121] Table 6

[0122] Figure 8A The axial chromatic aberration curve of the optical imaging lens system of Example 3 is shown, which indicates the deviation of the convergent focus of light of different wavelengths after passing through the system. Figure 8B The astigmatism curve of the optical imaging lens group of Example 3 is shown, which represents the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the optical imaging lens assembly of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different image heights. Figure 8D The chromatic aberration curve of the optical imaging lens group of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the optical imaging lens group. Figures 8A to 8D It can be seen that the optical imaging lens assembly provided in Example 3 can achieve good imaging quality.

[0123] In summary, Examples 1 to 3 respectively satisfy the relationships shown in Table 7.

[0124]

[0125]

[0126] Table 7

[0127] The present application also provides an imaging device, wherein the electronic photosensitive element may be a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS). The imaging device may be a standalone imaging device such as a digital camera, or an imaging module integrated into a mobile electronic device such as a mobile phone. The imaging device is equipped with the optical imaging lens assembly described above.

[0128] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of protection provided in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the concept of this application. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features having similar functions disclosed in this application.

Claims

1. An optical imaging lens assembly, characterized in that: Along the optical axis from the object side to the image side, they include: a first lens having positive optical power and a convex object-side surface; a second lens having optical power and a concave image-side surface; The third lens has positive optical power, its object-side surface is concave and its image-side surface is convex; a fourth lens element having negative optical power, whose object-side surface is convex and whose image-side surface is concave; The optical imaging lens group includes four lenses having optical power. The distance T23 between the second lens and the third lens on the optical axis, the distance T12 between the first lens and the second lens on the optical axis, and the distance T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 1≤T23 / (T12+T34)≤3.94; The distance T23 between the second lens and the third lens on the optical axis and the distance T34 between the third lens and the fourth lens on the optical axis satisfy the following conditions: 6.34≤T23 / T34≤9.12; The distance TTL from the object side of the first lens to the imaging surface of the optical imaging lens assembly on the optical axis and half the diagonal length of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens assembly ImgH satisfy the following: 1.46≤TTL / ImgH≤1.53; The optical imaging lens assembly further includes an infrared bandpass filter disposed between the fourth lens and the imaging surface of the optical imaging lens assembly; and At least one mirror surface from the object-side surface of the first lens to the image-side surface of the fourth lens is an aspherical surface.

2. The optical imaging lens assembly according to claim 1, wherein: The maximum field of view FOV of the optical imaging lens group and the distance TTL from the object side surface of the first lens to the imaging surface of the optical imaging lens group on the optical axis satisfy: 0.34≤tan(FOV / 2) / TTL≤0.

38.

3. The optical imaging lens assembly according to claim 1, wherein: The half of the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens group and the total effective focal length f of the optical imaging lens group satisfy the following conditions: <ImgH / f≤1.08。 4. The optical imaging lens assembly according to claim 1, wherein: A distance TTL from the object-side surface of the first lens to the imaging surface of the optical imaging lens assembly on the optical axis satisfies the following conditions: 2.79 mm ≤ TTL ≤ 2.94 mm.

5. The optical imaging lens assembly according to claim 1, wherein: A central curvature radius R1 of the object-side surface of the first lens and a total effective focal length f of the optical imaging lens assembly satisfy the following: 0.68≤R1 / f≤1.

71.

6. The optical imaging lens assembly according to claim 1, wherein: A central curvature radius R5 of the object-side surface of the third lens and a central curvature radius R6 of the image-side surface of the third lens satisfy: 2.36≤(R5+R6) / (R5-R6)≤3.

04.

7. The optical imaging lens assembly according to claim 1, wherein: A distance SAG32 from 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 on the optical axis and a center thickness CT3 of the third lens on the optical axis satisfy: -0.70≤SAG32 / CT3≤-0.

64.

8. The optical imaging lens assembly according to claim 1, wherein: The distance SAG11 from the intersection of the object side surface of the first lens and the optical axis to the effective radius vertex of the object side surface of the first lens on the optical axis and the center thickness CT1 of the first lens on the optical axis satisfy: <SAG11 / CT1≤0.22。 9. The optical imaging lens assembly according to claim 1, wherein: A central thickness CT2 of the second lens on the optical axis and a maximum effective semi-aperture DT22 of the image-side surface of the second lens satisfy the following: 0.25≤CT2 / DT22≤0.

32.

10. The optical imaging lens assembly according to claim 1, wherein: The maximum effective semi-aperture DT11 of the object side surface of the first lens and half the diagonal length ImgH of the effective pixel area of ​​the photosensitive element on the imaging surface of the optical imaging lens group satisfy the following: 0.23≤DT11 / ImgH≤0.

25.

11. The optical imaging lens assembly according to claim 1, wherein: The maximum effective semi-aperture DT42 of the image-side surface of the fourth lens and the maximum effective semi-aperture DT32 of the image-side surface of the third lens satisfy the following: 0.45≤(DT42-DT32) / DT42<0.

5.

12. The optical imaging lens assembly according to claim 1, wherein: A center thickness CT1 of the first lens on the optical axis and a center thickness CT2 of the second lens on the optical axis satisfy the following: 1.74≤CT1 / CT2≤2.

92.

13. The optical imaging lens assembly according to claim 1, wherein: A center thickness CT3 of the third lens on the optical axis and a distance T34 between the third lens and the fourth lens on the optical axis satisfy the following: 16.56≤CT3 / T34≤19.

38.

14. The optical imaging lens assembly according to claim 1, wherein: An edge thickness ET2 of the second lens at the maximum effective diameter and an edge thickness ET3 of the third lens at the maximum effective diameter satisfy the following: 1.16≤ET2 / ET3≤1.

25.

15. The optical imaging lens assembly according to claim 1, wherein: The maximum effective semi-aperture DT11 of the object-side surface of the first lens and the maximum effective semi-aperture DT21 of the object-side surface of the second lens satisfy the following: 0.73≤DT11 / DT21≤0.

86.

16. The optical imaging lens assembly according to claim 1, wherein: The distance SAG31 from 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 on the optical axis satisfies: -0.6 <SAG31 / T23≤-0.32。 17. The optical imaging lens assembly according to claim 1, wherein: The distance SAG21 from 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 on the optical axis and the distance SAG22 from 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 on the optical axis satisfy: -3 <SAG21 / SAG22≤-0.23。 18. The optical imaging lens assembly according to claim 1, wherein: A central curvature radius R4 of the image-side surface of the second lens and a total effective focal length f of the optical imaging lens assembly satisfy the following conditions: 0.71≤R4 / f≤1.

19.

19. The optical imaging lens assembly according to any one of claims 1 to 18, characterized in that: The object side and image side of the infrared bandpass filter are provided with infrared high-transmittance films or visible light cut-off films.

20. The optical imaging lens assembly according to any one of claims 1 to 18, characterized in that: At least one mirror surface from the object side surface of the first lens to the image side surface of the fourth lens is provided with an infrared high-transmittance film or a visible light cut-off film.

21. The optical imaging lens assembly according to claim 19, wherein: The transmittance of the infrared high-transmittance film in the infrared band range of 740 nm-1100 nm is greater than 98%; the reflectivity of the visible light cutoff film in the visible band range of 380 nm-720 nm is greater than 0, and the reflectivity in the visible band range of 420 nm-590 nm is greater than 20%.

Images