Optical image pickup device

Abstract

The application discloses an optical image pickup device, which comprises, in sequence from an object side to an image side along an optical axis, a prism with positive refractive power, an incident surface of the prism being a convex surface and an exit surface being a plane, the prism allowing light incident along a first optical axis to be reflected and exit along a second optical axis, wherein the first optical axis is perpendicular to the second optical axis; a first lens with refractive power, an object side surface of the first lens being a convex surface; a second lens with refractive power, an image side surface of the second lens being a concave surface; a third lens with positive refractive power, an object side surface of the third lens being a convex surface and an image side surface being a concave surface; a fourth lens with negative refractive power, an object side surface of the fourth lens being a concave surface; a fifth lens with refractive power; a sixth lens with refractive power; and a seventh lens with refractive power; the optical image pickup device satisfies 1.4<|f12| / f<5.0 and 0.4<Rg / f<0.8; wherein f12 is a combined focal length of the first lens and the second lens, f is a total effective focal length of the optical image pickup device, and Rg is a radius of curvature of the incident surface of the prism.

Description

Technical Field

[0001] This application relates to an optical imaging device, specifically an optical imaging device including seven lenses. Background Art

[0002] With the rapid development of mobile phone camera lenses, consumers' demand for camera diversity has also increased. Telephoto lenses have been widely used due to their advantages such as clear imaging of distant objects, large magnification, and ability to present the detailed features of objects.

[0003] The total effective focal length of a telephoto lens is an important criterion for determining whether a camera lens is a telephoto lens. Usually, in order to obtain a large total effective focal length, the overall length of the lens also affects the thinness and lightness of the mobile phone. At the same time, the large total effective focal length of the telephoto lens also leads to a reduction in depth of field and light input, resulting in difficult focusing for users during shooting and poor imaging quality in night shooting situations. Summary of the Invention

[0004] This application provides an optical imaging device that can at least solve or partially solve at least one problem or other problems existing in the prior art.

[0005] On the one hand, this application provides such an optical imaging device, which sequentially includes, from the object side to the image side along the optical axis: a prism with a positive optical power, the incident surface of the prism is convex, the exit surface is flat, and the prism makes the light incident along the first optical axis exit along the direction of the second optical axis after reflection, where the first optical axis is perpendicular to the second optical axis; a first lens with an optical power, the object side surface of which is convex; a second lens with an optical power, the image side surface of which is concave; a third lens with a positive optical power, the object side surface of which is convex and the image side surface is concave; a fourth lens with a negative optical power, the object side surface of which is concave; a fifth lens with an optical power; a sixth lens with an optical power; and a seventh lens with an optical power. The optical imaging device satisfies: 1.4 < |f12| / f < 5.0 and 0.4 < Rg / f < 0.8. Here, f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, and Rg is the radius of curvature of the incident surface of the prism.

[0006] According to an exemplary embodiment of this application, the radius of curvature R1 of the object side surface of the first lens and the distance SAG11 on the second optical axis between the intersection point of the object side surface of the first lens and the second optical axis and the vertex of the effective radius of the object side surface of the first lens satisfy: 14 < |R1 / SAG11| < 41.

[0007] According to an exemplary embodiment of this application, the distance SAG11 between the intersection of the object side surface of the first lens and the second optical axis and the vertex of the effective radius of the object side surface of the first lens on the second optical axis satisfies the following condition: 0.5 < |SAG11 / ET1| < 2.0.

[0008] According to an exemplary embodiment of this application, the distance SAG22 between the intersection of the image-side surface of the second lens and the second optical axis and the vertex of the effective radius of the image-side surface of the second lens on the second optical axis and the center thickness CT2 of the second lens on the second optical axis satisfy: 2.9 < |SAG22| / CT2 < 3.8.

[0009] According to an exemplary embodiment of this application, the distance SAG41 on the second optical axis between the edge thickness ET4 of the fourth lens and the intersection of the object-side surface of the fourth lens and the second optical axis, and the vertex of the effective radius of the object-side surface of the fourth lens, satisfies: 1.2 <ET4 / |SAG41|<9.5。

[0010] According to an exemplary embodiment of this application, the distance SAG51 on the second optical axis between the edge thickness ET5 of the fifth lens and the intersection of the object-side surface of the fifth lens and the second optical axis, and the vertex of the effective radius of the object-side surface of the fifth lens, satisfies: 1.3 <ET5 / |SAG51|<2.5。

[0011] According to an exemplary embodiment of this application, the distance SAG61 between the intersection of the object side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the object side surface of the sixth lens on the second optical axis and the distance SAG62 between the intersection of the image side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the image side surface of the sixth lens on the second optical axis satisfy: 0<|SAG61| / |SAG62|<4.1.

[0012] According to an exemplary embodiment of this application, the radius of curvature R2 of the image-side surface of the first lens and the radius of curvature R3 of the object-side surface of the second lens satisfy: 0.1 <R2 / R3<3.1。

[0013] According to an exemplary embodiment of this application, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -2 <f1 / f2<0。

[0014] According to an exemplary embodiment of this application, the prism includes a reflecting surface connecting the incident surface and the exit surface. The axial distance G1 between the incident surface and the reflecting surface of the prism on the first optical axis, the axial distance G2 between the reflecting surface and the exit surface of the prism on the second optical axis, and the axial distance TD between the object side surface of the first lens and the image side surface of the seventh lens on the second optical axis satisfy: 0.9 < (G1 + G2) / TD < 1.2.

[0015] According to an exemplary embodiment of this application, the center thickness CT6 of the sixth lens on the second optical axis and the center thickness CT7 of the seventh lens on the second optical axis satisfy: 2.3 <CT7 / CT6<8.1。

[0016] According to an exemplary embodiment of this application, the edge thickness ET2 of the second lens, the spacing T12 between the first and second lenses on the second optical axis, the spacing T23 between the second and third lenses on the second optical axis, and the center thickness CT2 of the second lens on the second optical axis satisfy: 1.7 <ET2 / (T12+CT2+T23)<3.9。

[0017] According to an exemplary embodiment of this application, the radius of curvature R6 of the image side of the third lens, the radius of curvature R7 of the object side of the fourth lens, and the total effective focal length f of the optical imaging device satisfy: -1.0 < (R6 + R7) / f < 6.7.

[0018] According to an exemplary embodiment of this application, the total effective focal length f of the optical imaging device and the combined focal length f56 of the fifth and sixth lenses satisfy: 0.2 <f / |f56|<4.3。

[0019] According to an exemplary embodiment of this application, the radius of curvature R5 of the object side of the third lens, the radius of curvature R6 of the image side of the third lens, and the radius of curvature R7 of the object side of the fourth lens satisfy: 0.4 < (R5 + R6) / |R7| < 16.0.

[0020] According to an exemplary embodiment of this application, the first to seventh lenses have an Abbe number of less than 20.

[0021] This application, by selecting a prism with positive optical power, effectively converges object-side light rays. Through reflection and refraction of the light path, it increases the light transmission of the optical imaging device and facilitates a more compact structure. Combined with a seven-element telephoto lens, it not only ensures high MTF (modulation transfer function) performance but also allows for better adaptation to larger image sensors due to the compact design. By rationally configuring the ratio of the combined focal length of the first and second lenses to the total effective focal length of the optical imaging device, optical power dispersion can be achieved, which helps shorten the overall system length. Furthermore, by constraining the ratio of the prism's incident surface radius of curvature to the total effective focal length of the optical imaging device, the distance between the lens and the prism can be effectively controlled within a suitable range, further controlling the overall system length and light transmission. This enables the optical imaging device to maintain a high MTF at both low and high frequencies. Attached Figure Description

[0022] Other features, objects, and advantages of this application will become more apparent from the detailed description of the non-limiting embodiments illustrated in the following figures.

[0023] Figure 1 A schematic diagram of the optical imaging device according to Embodiment 1 of this application is shown;

[0024] Figures 2A to 2D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 1 of this application are shown respectively.

[0025] Figure 3 A schematic diagram of the optical imaging device according to Embodiment 2 of this application is shown;

[0026] Figures 4A to 4D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 2 of this application are shown respectively.

[0027] Figure 5 A schematic diagram of the optical imaging device according to Embodiment 3 of this application is shown;

[0028] Figures 6A to 6D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 3 of this application are shown respectively.

[0029] Figure 7 A schematic diagram of the structure of the optical imaging device according to Embodiment 4 of this application is shown;

[0030] Figures 8A to 8D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 4 of this application are shown respectively.

[0031] Figure 9 A schematic diagram of the optical imaging device according to Embodiment 5 of this application is shown;

[0032] Figures 10A to 10D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 5 of this application are shown respectively.

[0033] Figure 11 A schematic diagram of the structure of the optical imaging device according to Embodiment 6 of this application is shown;

[0034] Figures 12A to 12D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 6 of this application are shown respectively.

[0035] Figure 13A schematic diagram of the structure of the optical imaging device according to Embodiment 7 of this application is shown;

[0036] Figures 14A to 14D The on-axis chromatic aberration curve, astigmatism curve, distortion curve, and magnification chromatic aberration curve of the optical imaging device according to Embodiment 7 of this application are shown respectively.

[0037] Figure 15 A parameter annotation diagram of the optical imaging device according to this application is shown;

[0038] Figure 16A The MTF curve of an optical imaging device that satisfies |f12| / f = 1.35 and Rg / f = 0.38 is shown.

[0039] Figure 16B The MTF curve of an optical imaging device that satisfies |f12| / f=51 and Rg / f=0.81 is shown.

[0040] Figure 16C The MTF curve of an optical imaging device that satisfies |f12| / f=4 and Rg / f=0.52 is shown. Detailed Implementation

[0041] To better understand this application, various aspects of this application will be described in detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely descriptions of exemplary embodiments of this application and are not intended to limit the scope of this application in any way.

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

[0043] In this article, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the location of the convexity 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 location of the concaveness 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 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 "comprising," "including," "having," "containing," and / or "comprises" as 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. It should be noted that in this specification, the expressions "first," "second," "third," etc., are used only to distinguish one feature from another and do not imply any limitation on the features.

[0045] Unless otherwise specified, all terms used herein shall have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. Terms shall be interpreted as having the meaning consistent with their meaning in the context of the relevant art and shall not be interpreted in an idealized or overly formal sense unless expressly stated herein.

[0046] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

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

[0048] Figure 15 This is a parameter annotation diagram according to an exemplary embodiment of this application. Reference Figure 15 SAG11 represents the distance on the second optical axis between the intersection of the object-side surface of the first lens and the second optical axis and the vertex of the effective radius of the object-side surface of the first lens; ET1 represents the edge thickness of the first lens; SAG22 represents the distance on the second optical axis between the intersection of the image-side surface of the second lens and the second optical axis and the vertex of the effective radius of the image-side surface of the second lens; ET2 represents the edge thickness of the second lens; SAG41 represents the distance on the second optical axis between the intersection of the object-side surface of the fourth lens and the second optical axis and the vertex of the effective radius of the object-side surface of the fourth lens; ET4 represents the edge thickness of the fourth lens; SAG51 represents the distance on the second optical axis between the intersection of the object-side surface of the fifth lens and the second optical axis and the vertex of the effective radius of the object-side surface of the fifth lens; ET5 represents the edge thickness of the fifth lens; SAG61 represents the distance on the second optical axis between the intersection of the object-side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the object-side surface of the sixth lens; SAG62 represents the distance on the second optical axis between the intersection of the image-side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the image-side surface of the sixth lens.

[0049] The first aspect of the present application provides an optical imaging device, which may include a prism with a positive optical power. The prism is used to change the optical path direction. For example, the prism is configured such that light incident along the first optical axis is reflected and exits along the direction of the second optical axis, where the first optical axis and the second optical axis are perpendicular.

[0050] The optical imaging device sequentially includes, from the object side to the image side along the second optical axis: a first lens with an optical power, whose object side is convex; a second lens with an optical power, whose image side is concave; a third lens with a positive optical power, whose object side is convex and image side is concave; a fourth lens with a negative optical power, whose object side is concave; a fifth lens with an optical power; a sixth lens with an optical power; and a seventh lens with an optical power. The prism may have an incident surface P1, a reflecting surface P2, and an exit surface P3. Among them, the incident surface P1 is convex, and the exit surface P3 is flat. Light from the object side enters the prism through the incident surface P1 along the direction of the first optical axis, is reflected by the reflecting surface P2 inside the prism, and then exits through the exit surface P3 along the direction of the second optical axis into the first lens. The number of lenses with optical power in the optical imaging device is seven.

[0051] By using the prism, the light from the object side can be deflected by 90°, so that the direction of the light exiting from the object side is substantially perpendicular to the arrangement direction of multiple rear lenses, thereby using the length space of the application device as the zoom space of the optical imaging device, and avoiding the limitation of the total effective focal length of the optical imaging device by the body thickness.

[0052] In an exemplary embodiment, the optical imaging device satisfies: 1.4 < |f12| / f < 5.0 and 0.4 < Rg / f < 0.8. Where f12 is the combined focal length of the first lens and the second lens, f is the total effective focal length of the optical imaging device, and Rg is the radius of curvature of the incident surface of the prism. By selecting a prism with a positive optical power, it is possible to effectively converge the object-side light rays, deflect the optical path by reflection, which is beneficial to increasing the light transmission amount of the optical imaging device, and is also beneficial to achieving the compactness of the structure of the optical imaging device. Combined with a seven-piece telephoto lens, it is not only beneficial to ensuring high modulation transfer function (MTF) performance, but also the compactness of the optical imaging device can better adapt to a larger-size image sensor. Reasonably configuring the ratio of the combined focal length of the first lens and the second lens to the total effective focal length of the optical imaging device can achieve the dispersion of optical power and help shorten the total length of the system. At the same time, further restricting the ratio of the radius of curvature of the incident surface of the prism to the total effective device of the optical imaging device can effectively control the distance between the lens and the prism within a suitable range, further control the total length and light transmission amount of the system, and enable the optical imaging device to have a high MTF in both low-frequency and high-frequency states.

[0053] Table 1 shows the MTF performance of optical imaging devices (such as lens 1, lens 2, and lens 3) under different parameter conditions.

[0054] As shown in Table 1, Figure 16A , Figure 16B , Figure 16C shown, Figure 16A The MTF curve of lens 1 that satisfies |f12| / f = 1.35 and Rg / f = 0.38. Figure 16B The MTF curve of lens 2 that satisfies |f12| / f = 51 and Rg / f = 0.81. Figure 16C The MTF curve of lens 3 that satisfies |f12| / f = 4.0 and Rg / f = 0.52.

[0055]

[0056] Table 1

[0057] From Figure 16A it can be seen that when the optical imaging device does not satisfy 1.4 < |f12| / f < 5.0 and 0.4 < Rg / f < 0.8, in the low-frequency state (110 lp / mm), the overall MTF value of the optical imaging device decreases by about 4% and the MTF value in the meridional direction of the 0.5F - 1.0F field of view decreases by 6% - 9%; in the high-frequency state (220 lp / mm), the overall MTF value of the optical imaging device decreases by about 7% and the MTF value in the meridional direction of the 0.5F - 1.0F field of view decreases by 9% - 16%.

[0058] From Figure 16B it can be seen that when the optical imaging device does not satisfy 1.4 < |f12| / f < 5.0 and 0.4 < Rg / f < 0.8, in the low-frequency state (110 lp / mm), the overall MTF value of the optical imaging device decreases by about 2% and the MTF value in the meridional direction of the 0.5F - 1.0F field of view decreases by 3% - 5%; in the high-frequency state (220 lp / mm), the overall MTF value of the optical imaging device decreases by about 7% and the MTF value in the meridional direction of the 0.5F - 1.0F field of view decreases by 5% - 10%.

[0059] From Figure 16C it can be seen that when the optical imaging device satisfies 1.4 < |f12| / f < 5.0 and 0.4 < Rg / f < 0.8, the MTF value of the optical imaging device is relatively stable and there is no obvious decrease, and the MTF performance of this lens is good.

[0060] In an exemplary embodiment, the radius of curvature R1 of the object side surface of the first lens and the distance SAG11 on the second optical axis between the intersection of the object side surface of the first lens and the second optical axis and the vertex of the effective radius of the object side surface of the first lens satisfy: 14 < |R1 / SAG11| < 41. By reasonably configuring the ratio of the radius of curvature of the object side surface of the first lens to the axial distance between the intersection of the object side surface of the first lens and the second optical axis and the vertex of the effective radius of the object side surface of the first lens, the deflection degree of the incident light from the prism on the first lens can be effectively controlled, thereby reducing the sensitivity of the optical imaging device and improving the imaging quality of the optical imaging device.

[0061] In an exemplary embodiment, the distance SAG11 on the second optical axis between the intersection of the object side surface of the first lens and the second optical axis and the vertex of the effective radius of the object side surface of the first lens and the edge thickness ET1 of the first lens satisfy: 0.5 < |SAG11 / ET1| < 2. . By controlling the ratio of the axial distance between the intersection of the object side surface of the first lens and the second optical axis and the vertex of the effective radius of the object side surface of the first lens to the edge thickness of the first lens, it is beneficial to control the surface shape of the first lens, so that the first lens has better processing and forming processability.

[0062] In an exemplary embodiment, the distance SAG22 on the second optical axis between the intersection of the image side surface of the second lens and the second optical axis and the vertex of the effective radius of the image side surface of the second lens and the central thickness CT2 of the second lens on the second optical axis satisfy: 2.9 < |SAG22| / CT2 < 3.8. By reasonably configuring the ratio of the axial distance between the intersection of the image side surface of the second lens and the second optical axis and the vertex of the effective radius of the image side surface of the second lens to the central thickness of the second lens on the second optical axis, the main ray incident angle on the object side surface of the third lens can be effectively reduced, and the adaptability between the optical imaging device and the chip can be improved.

[0063] In an exemplary embodiment, the edge thickness ET4 of the fourth lens and the distance SAG41 on the second optical axis between the intersection of the object side surface of the fourth lens and the second optical axis and the vertex of the effective radius of the object side surface of the fourth lens satisfy: 1.2 < ET4 / |SAG41| < 9.5. By reasonably configuring the ratio of the edge thickness of the fourth lens to the axial distance between the intersection of the object side surface of the fourth lens and the second optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the deflection angle of the marginal rays of the system can be effectively controlled, and the sensitivity of the optical imaging device can be effectively reduced.

[0064] In an exemplary embodiment, the edge thickness ET5 of the fifth lens and the distance SAG51 on the second optical axis between the intersection of the object side surface of the fifth lens and the second optical axis and the vertex of the effective radius of the object side surface of the fifth lens satisfy: 1.3 < ET5 / |SAG51| < 2.5. By reasonably configuring the ratio of the edge thickness of the fifth lens to the axial distance between the intersection of the object side surface of the fifth lens and the second optical axis and the vertex of the effective radius of the object side surface of the fifth lens, the contribution of the fifth lens to the astigmatism and coma at the edge of the optical imaging device can be effectively controlled, and the imaging quality of the off-axis field can be improved.

[0065] In an exemplary embodiment, the distance SAG61 on the second optical axis between the intersection of the object side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the object side surface of the sixth lens and the distance SAG62 on the second optical axis between the intersection of the image side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the image side surface of the sixth lens satisfy: 0 < |SAG61| / |SAG62| < 4.1. By reasonably configuring the ratio of the axial distance between the intersection of the object side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the object side surface of the sixth lens to the axial distance between the intersection of the image side surface of the sixth lens and the second optical axis and the vertex of the effective radius of the image side surface of the sixth lens, it is beneficial to balance the relationship between the miniaturization of the optical imaging device and the relative illumination of the off-axis field.

[0066] In an exemplary embodiment, the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens satisfy: 0.1 < R2 / R3 < 3.1. By reasonably configuring the ratio of the radius of curvature of the image side surface of the first lens to the radius of curvature of the object side surface of the second lens, it is beneficial to reduce the introduction of spherical aberration and improve the imaging quality of the optical imaging device.

[0067] In an exemplary embodiment, the effective focal length f1 of the first lens and the effective focal length f2 of the second lens satisfy: -2 < f1 / f2 < 0. By reasonably configuring the ratio of the effective focal length of the first lens to the effective focal length of the second lens, the contribution of spherical aberration of the first lens and the second lens can be reasonably distributed, thereby improving the resolution of the optical imaging device.

[0068] In an exemplary embodiment, the prism includes a reflecting surface connecting an incident surface and an exit surface. The axial distance G1 between the incident surface of the prism and the reflecting surface of the prism on the first optical axis, the axial distance G2 between the reflecting surface of the prism and the exit surface of the prism on the second optical axis, and the axial distance TD between the object side surface of the first lens and the image side surface of the seventh lens on the second optical axis satisfy: 0.9 < (G1 + G2) / TD < 1.2. Reasonably configuring the relationship between the axial distance between the incident surface of the prism and the reflecting surface of the prism on the first optical axis, the axial distance between the reflecting surface of the prism and the incident surface of the prism on the second optical axis, and the axial distance between the object side surface of the first lens and the image side surface of the seventh lens on the second optical axis is beneficial to reasonably allocate the total length of the optical imaging device and is beneficial to miniaturize the optical imaging device.

[0069] In an exemplary embodiment, the central thickness CT6 of the sixth lens on the second optical axis and the central thickness CT7 of the seventh lens on the second optical axis satisfy: 2.3 < CT7 / CT6 < 8.1. Reasonably configuring the ratio of the central thickness of the sixth lens on the second optical axis to the central thickness of the seventh lens on the second optical axis can reasonably control the field curvature of the system and improve the matching degree between the optical imaging device and the chip.

[0070] In an exemplary embodiment, the edge thickness ET2 of the second lens, the distance T12 between the first lens and the second lens on the second optical axis, the distance T23 between the second lens and the third lens on the second optical axis, and the central thickness CT2 of the second lens on the second optical axis satisfy: 1.7 < ET2 / (T12 + CT2 + T23) < 3.9. Reasonably configuring the relationship between the edge thickness of the second lens, the air gap between the first lens and the second lens on the second optical axis, the air gap between the second lens and the third lens on the second optical axis, and the central thickness of the second lens on the second optical axis is beneficial to improving the processing technology of the second lens, reducing the forming manufacturing difficulty of the second lens, and the sensitivity of the second lens.

[0071] In an exemplary embodiment, the radius of curvature R6 of the image side surface of the third lens, the radius of curvature R7 of the object side surface of the fourth lens, and the total effective focal length f of the optical imaging device satisfy: -1.0 < (R6 + R7) / f < 6.7. By controlling the relationship between the radius of curvature of the image side surface of the third lens, the radius of curvature of the object side surface of the fourth lens, and the total effective focal length of the optical imaging device within a certain range, it is beneficial to the optical power of the third lens and the fourth lens and reduces the sensitivity of the optical imaging device.

[0072] In an exemplary embodiment, the total effective focal length f of the optical imaging device and the combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.2 < f / |f56| < 4.3. Reasonably configuring the ratio of the total effective focal length of the optical imaging device to the combined focal length of the fifth lens and the sixth lens is beneficial to reducing the total length of the optical imaging device, realizing miniaturization of the optical imaging device, and at the same time can effectively avoid the problem of high system tolerance sensitivity caused by overly concentrated optical power.

[0073] In an exemplary embodiment, the radius of curvature R5 of the object side surface of the third lens, the radius of curvature R6 of the image side surface of the third lens, and the radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.4 < (R5 + R6) / |R7| < 16.0. Reasonably configuring the relationship between the radius of curvature of the object side surface of the third lens, the radius of curvature of the image side surface of the third lens, and the radius of curvature of the object side surface of the fourth lens is beneficial to reducing the deflection angle of light between the third lens and the fourth lens, so that the optical imaging device can better achieve light path deflection.

[0074] In an exemplary embodiment, among the first lens to the seventh lens, there is a lens with an Abbe number less than 20. By restricting the Abbe numbers of the first lens to the seventh lens, the overall chromatic aberration of the optical imaging device can be effectively controlled.

[0075] In a second aspect of the present application, there is provided such an optical imaging device. The optical imaging device may include a prism with positive optical power. The prism is used to change the light path direction. For example, the prism is configured such that light incident along the first optical axis is reflected and exits along the direction of the second optical axis, where the first optical axis and the second optical axis are perpendicular. The optical imaging device sequentially includes, along the second optical axis from the prism to the image side: a first lens with optical power, a second lens with optical power, a third lens with positive optical power, a fourth lens with negative optical power, a fifth lens with optical power, a sixth lens with optical power, and a seventh lens with optical power. The prism may have an incident surface P1, a reflection surface P2, and an exit surface P3. Among them, the incident surface P1 is a convex surface, and the exit surface P3 is a flat surface. Light from the object side enters the prism through the incident surface P1 along the direction of the first optical axis, and after being reflected by the reflection surface P2 in the prism, exits through the exit surface P3 along the direction of the second optical axis and enters the first lens. The number of lenses with optical power in the optical imaging device is seven.

[0076] By using the prism, the light from the object side can be deflected by 90°, so that the direction of the light exiting the object side is substantially perpendicular to the arrangement direction of the multiple rear lenses, thereby using the length space of the application device as the zoom space of the optical imaging device, and avoiding the limitation of the total effective focal length of the optical imaging device by the body thickness.

[0077] The total effective focal length f of the optical imaging device and the combined focal length f56 of the fifth and sixth lenses satisfy: 0.2 <f / |f56|<4.3。

[0078] By rationally configuring the ratio of the total effective focal length of the optical imaging device to the combined focal length of the fifth and sixth lenses, it is beneficial to reduce the total length of the optical imaging device, realize the miniaturization of the optical imaging device, and at the same time effectively avoid the problem of high system tolerance sensitivity caused by excessive concentration of optical focal length.

[0079] However, those skilled in the art should understand that, without departing from the technical solutions claimed in this application, the number of lenses constituting the optical system can be changed to obtain the various results and advantages described in this specification.

[0080] Specific embodiments of the optical system applicable to the above-described embodiments are further described below with reference to the accompanying drawings.

[0081] Example 1

[0082] The following is for reference Figures 1 to 2D The optical imaging apparatus according to Embodiment 1 of this application is described.

[0083] like Figure 1 As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0084] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0085] The first lens has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0086] Table 2 shows the basic parameters of the optical imaging device of Embodiment 1, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0087]

[0088] Table 2

[0089] In this embodiment, the total effective focal length f of the optical imaging device is 15.51 mm, the combined focal length f12 of the first lens and the second lens is -72.38 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -8.22 mm.

[0090] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical surfaces. The surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formulas:

[0091]

[0092] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; 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 i-th order correction coefficient of the aspherical surface. Table 3 gives the higher-order coefficients A4, A6, A8, A14 that can be used for each aspherical mirror S1 to S14 in Example 1. 10 A 12 A 14 A 16 A 18 and A 20 .

[0093]

[0094]

[0095] Table 3

[0096] Figure 2A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 2B The astigmatism curves of the optical imaging device of Embodiment 1 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 2C The distortion curve of the optical imaging device of Embodiment 1 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 2D The magnification chromatic aberration curve of the optical imaging device of Embodiment 1 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 2A to 2D It can be seen that the optical imaging device of Example 1 can achieve good imaging quality.

[0097] Example 2

[0098] The following is for reference Figures 3 to 4D Describes an optical imaging device according to Embodiment 2 of this application.

[0099] like Figure 3 As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0100] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0101] The first lens has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0102] Table 4 shows the basic parameters of the optical imaging device of Example 2, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0103]

[0104]

[0105] Table 4

[0106] In this embodiment, the total effective focal length f of the optical imaging device is 18.00 mm, the combined focal length f12 of the first lens and the second lens is -62.93 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -5.84 mm.

[0107] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical. Table 5 gives the higher-order coefficients A4, A6, A8, and A6 that can be used for each aspherical mirror surface S1 to S14 in Example 2. 10 A 12 A 14 A 16 A 18 and A 20 .

[0108] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 3.3581E-01 5.0184E-03 -2.9287E-03 -8.6525E-05 5.9330E-04 4.7685E-04 -5.8266E-05 1.4207E-04 4.5545E-05 S2 4.8154E-02 -2.0335E-02 3.7636E-03 1.0289E-03 1.2053E-03 -4.6703E-04 -9.6586E-04 9.0472E-05 -7.3634E-05 S3 -8.9556E-02 2.9534E-02 -1.1016E-02 1.5202E-03 2.6673E-04 1.3391E-04 3.4197E-05 -4.8064E-04 -2.1989E-05 S4 -2.1850E-01 4.2850E-02 -3.0324E-03 1.2356E-03 -1.0622E-04 4.4478E-04 3.6509E-04 4.7834E-05 -2.0689E-04 S5 -1.7308E-02 5.0277E-03 2.4817E-03 7.1687E-04 9.3080E-04 1.3088E-03 -7.5011E-04 -1.5402E-04 -4.2282E-04 S6 6.5815E-02 8.8603E-03 -1.0828E-02 1.1881E-04 6.1589E-04 1.3837E-03 1.2234E-04 2.0749E-04 6.5555E-05 S7 2.3908E-02 -1.5230E-02 -6.4184E-03 -1.1802E-03 -1.2810E-03 5.1075E-04 -2.3340E-04 1.7494E-04 8.0544E-05 S8 -6.5711E-02 -1.9383E-02 -1.1569E-02 8.8056E-04 -8.8189E-04 6.8336E-04 2.7271E-04 2.4812E-05 9.7096E-06 S9 6.2338E-02 5.1652E-02 -1.9763E-02 -3.1266E-03 2.3525E-03 -2.2372E-04 4.1113E-04 -1.2442E-04 -2.7912E-05 S10 -4.7680E-01 3.0220E-02 -9.2729E-03 -1.1553E-02 3.0991E-03 -2.4664E-03 -3.4359E-04 -3.0943E-04 -8.0570E-06 S11 2.1364E-01 -7.1907E-02 3.3812E-02 -4.6451E-03 3.1144E-03 -1.7590E-04 -4.6859E-04 -2.3677E-04 -5.1911E-05 S12 3.9775E-01 -6.4275E-02 7.6761E-03 -2.2631E-04 -5.6998E-05 3.9592E-04 -1.0851E-04 -3.0994E-05 -2.7390E-05 S13 2.0377E-01 1.1551E-03 -1.3677E-03 1.7776E-03 -7.3281E-04 2.7431E-04 -4.4338E-05 1.0544E-05 -3.3880E-06 S14 2.2414E-01 -6.6919E-03 1.0120E-02 -2.1050E-03 8.4268E-04 -6.0370E-05 1.0621E-04 2.1818E-05 -5.9927E-06

[0109] Table 5

[0110] Figure 4A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 2 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 4B The astigmatism curves of the optical imaging device of Embodiment 2 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 4C The distortion curve of the optical imaging device of Embodiment 2 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 4D The magnification chromatic aberration curve of the optical imaging device of Embodiment 2 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 4A to 4D It can be seen that the optical imaging device of Embodiment 2 can achieve good imaging quality.

[0111] Example 3

[0112] The following is for reference Figures 5 to 6D The optical imaging apparatus according to Embodiment 3 of this application is described.

[0113] like Figure 5 As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0114] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0115] The first lens has negative optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens has positive optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially from each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0116] Table 6 shows the basic parameters of the optical imaging device of Embodiment 3, where the units for radius of curvature, thickness / distance, and focal length are all millimeters (mm).

[0117]

[0118] Table 6

[0119] In this embodiment, the total effective focal length f of the optical imaging device is 18.11 mm, the combined focal length f12 of the first lens and the second lens is -75.68 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -4.33 mm.

[0120] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical. Table 7 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror surface S1 to S14 in Example 3. 10 A 12 A 14 A 16 A 18 and A 20 .

[0121]

[0122]

[0123] Table 7

[0124] Figure 6A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 3 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 6B The astigmatism curves of the optical imaging device of Embodiment 3 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 6C The distortion curve of the optical imaging device of Embodiment 3 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 6D The magnification chromatic aberration curve of the optical imaging device of Embodiment 3 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 6A to 6D It can be seen that the optical imaging device of Example 3 can achieve good imaging quality.

[0125] Example 4

[0126] The following is for reference Figures 7 to 8D The optical imaging apparatus according to Embodiment 4 of this application is described.

[0127] like Figure 7 As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0128] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0129] The first lens has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens has negative optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0130] Table 8 shows the basic parameters of the optical imaging device of Embodiment 4, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0131]

[0132]

[0133] Table 8

[0134] In this embodiment, the total effective focal length f of the optical imaging device is 12.00 mm, the combined focal length f12 of the first lens and the second lens is -56.95 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -7.08 mm.

[0135] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical. Table 9 gives the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror surface S1 to S14 in Example 4. 10 A 12 A 14 A 16 A 18 and A 20 .

[0136] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 2.8596E-01 7.3281E-03 5.7697E-03 -4.4562E-05 -1.0644E-03 -2.6157E-04 -8.4041E-04 -3.2730E-04 4.2441E-05 S2 1.0031E-01 -2.9619E-02 -3.2234E-03 -5.8671E-05 1.0399E-03 2.7801E-03 -2.6769E-04 1.1846E-04 4.9063E-05 S3 -1.2473E-01 3.5331E-02 -1.3885E-02 7.6820E-04 1.2965E-03 7.6343E-04 -9.4604E-04 -1.0947E-03 -5.7840E-04 S4 -2.0198E-01 4.1921E-02 6.7775E-03 4.8853E-03 2.6369E-03 1.8378E-03 1.3964E-03 9.9202E-04 1.0709E-05 S5 -4.7460E-02 8.0220E-03 1.2150E-03 1.7806E-03 -2.3706E-04 1.0143E-03 2.0409E-04 5.9246E-04 -1.5790E-04 S6 8.7833E-02 -2.7458E-03 -1.3403E-02 -1.8293E-04 -9.7212E-04 -7.0312E-04 -5.4776E-04 -2.7694E-04 -3.6014E-05 S7 7.7978E-02 -5.7602E-02 -1.2347E-03 5.1059E-03 -3.4679E-03 1.3320E-03 9.2147E-04 -5.5441E-04 7.1537E-05 S8 -1.2301E-01 -2.9307E-02 -7.9716E-03 2.0976E-03 -1.6235E-03 -1.6297E-03 1.8604E-04 1.2426E-06 3.2393E-05 S9 1.4445E-01 7.8454E-02 -2.3669E-02 -2.2796E-03 1.2012E-03 -1.8213E-03 -3.6186E-05 3.7358E-04 3.7719E-05 S10 -4.0886E-01 1.5746E-02 -5.7244E-03 -5.7155E-03 3.0848E-03 -5.8063E-03 -1.1193E-03 -4.0403E-04 -3.7015E-04 S11 1.3307E-01 -6.3066E-02 3.8606E-02 -4.3624E-03 2.9804E-03 1.0776E-03 -4.1373E-04 1.3799E-04 2.1142E-05 S12 2.9839E-01 -2.5424E-02 7.7737E-03 4.9985E-03 -2.5994E-03 1.1454E-03 -5.8856E-04 8.0989E-05 -1.3721E-04 S13 2.1558E-01 -6.7726E-03 5.0917E-03 1.1584E-03 -3.1938E-04 2.1588E-04 -1.3779E-04 3.2461E-05 7.9982E-06 S14 1.7422E-01 5.2698E-03 2.0568E-02 2.1078E-03 1.8522E-03 5.9534E-04 7.0145E-05 -1.5286E-05 -1.6509E-05

[0137] Table 9

[0138] Figure 8A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 4 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 8B The astigmatism curves of the optical imaging device of Embodiment 4 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 8C The distortion curve of the optical imaging device of Embodiment 4 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 8D The magnification chromatic aberration curve of the optical imaging device of Embodiment 4 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 8A to 8D It can be seen that the optical imaging device of Example 4 can achieve good imaging quality.

[0139] Example 5

[0140] The following is for reference Figures 9 to 10D This application describes an optical imaging device according to Embodiment 5.

[0141] like Figure 9 As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0142] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0143] The first lens has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being convex. The sixth lens has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being convex. The seventh lens has negative optical power, with its object-side surface S13 being convex and its image-side surface S14 being concave. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially from each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0144] Table 10 shows the basic parameters of the optical imaging device of Embodiment 5, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0145]

[0146] Table 10

[0147] In this embodiment, the total effective focal length f of the optical imaging device is 15.51 mm, the combined focal length f12 of the first lens and the second lens is -36.07 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -50.75 mm.

[0148] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical. Table 11 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror surface S1 to S14 in Example 5. 10 A 12 A 14 A 16 A 18 and A 20 .

[0149]

[0150]

[0151] Table 11

[0152] Figure 10A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 5 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 10B The astigmatism curves of the optical imaging device of Embodiment 5 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 10C The distortion curve of the optical imaging device of Embodiment 5 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 10D The magnification chromatic aberration curve of the optical imaging device of Embodiment 5 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 10A to 10D It can be seen that the optical imaging device of Example 5 can achieve good imaging quality.

[0153] Example 6

[0154] The following is for reference Figures 11 to 12D The optical imaging apparatus according to Embodiment 6 of this application is described.

[0155] like Figure 11As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0156] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0157] The first lens has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being convex. The second lens has negative optical power, with its object-side surface S3 being concave and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being convex. The fifth lens has negative optical power, with its object-side surface S9 being concave and its image-side surface S10 being concave. The sixth lens has positive optical power, with its object-side surface S11 being convex and its image-side surface S12 being concave. The seventh lens has positive optical power, with its object-side surface S13 being convex and its image-side surface S14 being convex. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0158] Table 12 shows the basic parameters of the optical imaging device of Embodiment 6, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0159]

[0160]

[0161] Table 12

[0162] In this embodiment, the total effective focal length f of the optical imaging device is 17.62 mm, the combined focal length f12 of the first lens and the second lens is -36.77 mm, and the combined focal length f56 of the fifth lens and the sixth lens is -12.89 mm.

[0163] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical. Table 12 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror surface S1 to S14 in Example 6. 10 A 12 A 14 A 16 A18 and A 20 .

[0164] Face number A4 A6 A8 A10 A12 A14 A16 A18 A20 S1 4.7217E-01 1.5499E-02 -3.6996E-03 1.0320E-03 -2.3668E-03 -1.9502E-03 -1.1427E-03 -2.8979E-04 -1.2400E-05 S2 5.5539E-01 -5.4755E-03 -2.6609E-02 -5.2096E-02 -3.2917E-02 -3.4672E-03 3.4816E-03 -1.4357E-03 -8.8832E-04 S3 -1.8889E-01 3.8126E-02 -3.6651E-02 1.8388E-02 -4.3132E-03 -6.6530E-04 9.9473E-04 -6.3980E-04 -4.9578E-04 S4 -3.6722E-01 6.7397E-02 -6.7258E-02 5.8547E-03 -1.9092E-02 -3.2310E-03 2.3951E-03 1.0291E-03 -2.5617E-05 S5 -1.5661E+01 2.7435E+00 -1.0505E+00 4.8042E-01 -2.4450E-01 1.3901E-01 -8.1588E-02 -1.8487E-01 -3.5484E-01 S6 2.9328E+01 -6.1257E+00 2.6886E+00 -6.8004E-01 -2.5019E-01 5.9108E-02 -8.7881E-02 8.5784E-02 -6.6003E-02 S7 1.8308E-01 -1.3986E-01 4.0572E-02 -3.1973E-03 -2.2850E-03 -5.8733E-03 -3.3336E-03 -2.5609E-03 7.2738E-04 S8 1.4622E+01 1.1307E+00 -1.3666E-01 1.0490E-01 -1.3695E-01 4.2898E-02 5.4651E-03 -3.6647E-02 4.0449E-02 S9 5.8254E-01 -6.9903E-02 -4.0991E-02 -1.8849E-02 -5.1648E-03 3.7982E-03 2.2026E-03 2.6005E-03 6.1377E-04 S10 -1.1275E+00 1.8319E-01 3.1354E-03 3.5769E-02 -3.1591E-02 7.4281E-03 5.2783E-03 -2.0459E-03 -8.8852E-03 S11 -5.5193E+01 -2.1901E+00 7.5819E-02 -5.2274E-01 4.4572E-01 -1.1062E-01 2.4152E-02 -1.7345E-02 -7.4824E-03 S12 5.0502E-01 -3.9928E-01 -5.6525E-02 -1.4420E-01 5.3098E-02 1.0185E-02 3.9946E-03 2.3922E-03 4.9635E-03 S13 1.4962E+00 -3.0128E-02 -4.1235E-02 -2.5447E-02 4.9014E-02 1.4359E-02 -1.0502E-02 -9.4016E-03 -2.4192E-03 S14 1.1151E+01 2.0280E-01 1.0736E+00 6.7127E-01 -3.1366E-01 -3.1854E-01 1.0441E-02 3.6384E-02 4.6943E-03

[0165] Table 13

[0166] Figure 12A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 6 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 12B The astigmatism curves of the optical imaging device of Embodiment 6 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 12C The distortion curve of the optical imaging device of Embodiment 6 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 12D The magnification chromatic aberration curve of the optical imaging device of Embodiment 6 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 12A to 12D It can be seen that the optical imaging device of Embodiment 6 can achieve good imaging quality.

[0167] Example 7

[0168] The following is for reference Figures 13 to 14D The optical imaging apparatus according to Embodiment 7 of this application is described.

[0169] like Figure 13 As shown, the optical imaging device includes, in sequence from the object side to the image side: a prism, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, and a seventh lens. An aperture stop STO (not shown) may be positioned between the object side and the incident surface P1 of the prism.

[0170] The prism has positive optical power, with its incident surface P1 being convex, its reflecting surface P2 being planar, and its exit surface P3 being planar. The prism is configured such that light incident along the first optical axis Z1 through the incident surface P1 is reflected by the reflecting surface P2 and exits along the second optical axis Z2, wherein the first optical axis Z1 and the second optical axis Z2 are perpendicular.

[0171] The first lens has positive optical power, with its object-side surface S1 being convex and its image-side surface S2 being concave. The second lens has negative optical power, with its object-side surface S3 being convex and its image-side surface S4 being concave. The third lens has positive optical power, with its object-side surface S5 being convex and its image-side surface S6 being concave. The fourth lens has negative optical power, with its object-side surface S7 being concave and its image-side surface S8 being concave. The fifth lens has positive optical power, with its object-side surface S9 being convex and its image-side surface S10 being convex. The sixth lens has negative optical power, with its object-side surface S11 being concave and its image-side surface S12 being concave. The seventh lens has negative optical power, with its object-side surface S13 being concave and its image-side surface S14 being concave. The optical imaging device may also include a filter placed on the image side of the seventh lens, the filter having an object-side surface S15 and an image-side surface S16. Light from the object passes sequentially through each surface P1 to S16 and is finally imaged on the imaging surface S17.

[0172] Table 14 shows the basic parameters of the optical imaging device of Embodiment 7, wherein the units of radius of curvature, thickness / distance and focal length are all millimeters (mm).

[0173]

[0174] Table 14

[0175] In this embodiment, the total effective focal length f of the optical imaging device is 16.97 mm, the combined focal length f12 of the first lens and the second lens is -26.3 mm, and the combined focal length f56 of the fifth lens and the sixth lens is 12.05 mm.

[0176] The object-side surface S1 of the first lens E1 to the image-side surface S14 of the seventh lens E7 are all aspherical. Table 15 lists the higher-order coefficients A4, A6, A8, and A14 that can be used for each aspherical mirror surface S1 to S14 in Example 7. 10 A 12 A 14 A 16 A 18 and A 20 .

[0177]

[0178]

[0179] Table 15

[0180] Figure 14A The on-axis chromatic aberration curve of the optical imaging device of Embodiment 7 is shown, which represents the deviation of the focal point of light of different wavelengths after passing through the optical imaging device. Figure 14B The astigmatism curves of the optical imaging device of Embodiment 7 are shown, which represent the meridional image plane curvature and sagittal image plane curvature corresponding to different image heights. Figure 14C The distortion curve of the optical imaging device of Embodiment 7 is shown, which represents the distortion magnitude value corresponding to different field of view angles. Figure 14D The magnification chromatic aberration curve of the optical imaging device of Embodiment 7 is shown, which represents the aberration at different image heights on the imaging plane after light passes through the lens. According to... Figures 14A to 14D It can be seen that the optical imaging device of Embodiment 7 can achieve good imaging quality.

[0181] Table 16 shows the values ​​of parameters SAG11, SAG22, SAG41, SAG51, SAG61, SAG62, ET1, ET2, ET4, ET5, G1, and G2 for each embodiment in Examples 1 to 7. At least some of these parameters can be calculated according to… Figure 15 The measurements were obtained using the annotation method shown, and the units of the parameters listed in Table 16 are all in mm.

[0182] Parameters / Examples 1 2 3 4 5 6 7 SAG11 -0.49 -0.34 -0.44 -0.58 -0.28 -0.47 -0.50 SAG22 -0.79 -0.78 -0.77 -0.73 -0.89 -0.86 -0.93 SAG41 0.48 0.43 0.38 0.50 0.40 0.20 0.35 SAG51 0.58 0.53 0.39 0.69 0.51 0.44 -0.20 SAG61 -0.09 0.28 0.04 -0.21 -0.49 -0.32 0.64 SAG62 -0.51 -0.27 -0.45 -0.44 0.30 -0.11 0.16 ET1 0.30 0.58 0.65 0.30 0.30 0.30 0.64 ET2 1.03 0.62 0.62 0.91 1.34 1.29 0.99 ET4 1.37 1.71 1.49 0.65 1.48 1.91 2.28 ET5 0.86 0.77 0.70 0.99 1.09 1.07 0.30 G1 5.63 5.63 5.63 4.00 5.63 5.64 5.63 G2 4.50 4.50 4.50 3.10 4.50 4.49 4.50

[0183] Table 16

[0184] In summary, the conditional expressions in Examples 1 to 7 satisfy the relationships shown in Table 17.

[0185] Conditional / Example 1 2 3 4 5 6 7 Rg / f 0.60 0.52 0.52 0.71 0.60 0.50 0.52 R2 / R3 0.38 2.11 1.16 0.14 0.54 0.64 3.04 f1 / f2 -1.25 -1.49 -0.01 -1.32 -1.36 -1.40 -1.95 (G1+G2) / TD 1.18 1.06 1.01 0.98 1.04 1.00 0.96 |SAG22| / CT2 3.17 3.13 3.09 2.91 3.57 3.39 3.73 CT7 / CT6 7.38 8.03 4.46 4.48 2.37 6.13 3.98 |SAG61| / |SAG62| 0.17 1.05 0.09 0.48 1.64 2.87 4.02 ET2 / (T12+CT2+T23) 2.94 1.76 1.73 2.61 3.83 3.63 2.51 ET4 / |SAG41| 2.84 3.96 3.91 1.30 3.70 9.42 6.43 |f12| / f 4.67 3.50 4.18 4.75 2.33 2.09 1.55 (R6+R7) / f 0.71 0.45 0.54 6.60 -0.64 -0.70 -0.90 f / |f56| 1.89 3.08 4.18 1.69 0.31 1.37 1.41 (R5+R6) / |R7| 3.83 3.20 3.46 15.67 0.76 0.71 0.58 ET5 / |SAG51| 1.48 1.46 1.80 1.43 2.13 2.43 1.50 |R1 / SAG11| 20.14 29.71 23.15 14.90 40.70 22.33 21.20 |SAG11 / ET1| 1.62 0.59 0.68 1.94 0.94 1.55 0.78

[0186] Table 17

[0187] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the application's concept. For example, technical solutions formed by substituting the above-described features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. An optical image taking device comprising, in order from an object side to an image side along an optical axis, a prism having positive refractive power, an incident surface of the prism being a convex surface and an exit surface being a plane, the prism causing light incident along a first optical axis to be reflected and exit in a direction of a second optical axis, wherein the first optical axis is perpendicular to the second optical axis; a first lens having refractive power, an object side surface of the first lens being a convex surface; a second lens having refractive power, an image side surface of the second lens being a concave surface; a third lens having positive refractive power, an object side surface of the third lens being a convex surface and an image side surface being a concave surface; a fourth lens having negative refractive power, an object side surface of the fourth lens being a concave surface; a fifth lens having refractive power; a sixth lens having refractive power; a seventh lens having refractive power; the first lens having positive refractive power, the second lens having negative refractive power, two of the fifth lens to the seventh lens having negative refractive power and the other having positive refractive power, or the fifth lens having negative refractive power and the sixth lens and the seventh lens both having positive refractive power; or the first lens, the fifth lens and the sixth lens having negative refractive power and the second lens and the seventh lens having positive refractive power; wherein the optical image taking device has seven lenses having refractive power; the optical image taking device satisfies 1.55≤|f12| / f≤4.75 and 0.5≤Rg / f≤0.71; wherein f12 is a combined focal length of the first lens and the second lens, f is a total effective focal length of the optical image taking device, and Rg is a radius of curvature of the incident surface of the prism; a radius of curvature R1 of the object side surface of the first lens, a distance SAG11 on the second optical axis between an intersection of the object side surface of the first lens and the second optical axis and an apex of an effective radius of the object side surface of the first lens satisfies 14.90≤|R1 / SAG11|≤40.70; a distance SAG11 on the second optical axis between an intersection of the object side surface of the first lens and the second optical axis and an apex of an effective radius of the object side surface of the first lens and an edge thickness ET1 of the first lens satisfy 0.59≤|SAG11 / ET1|≤1.94; a distance SAG22 on the second optical axis between an intersection of the image side surface of the second lens and the second optical axis and an apex of an effective radius of the image side surface of the second lens and a central thickness CT2 of the second lens on the second optical axis satisfy 2.9<|SAG22| / CT2≤3.73; an edge thickness ET4 of the fourth lens and a distance SAG41 on the second optical axis between an intersection of the object side surface of the fourth lens and the second optical axis and an apex of an effective radius of the object side surface of the fourth lens satisfy 1.30≤ET4 / |SAG41|≤9.42; an edge thickness ET5 of the fifth lens and a distance SAG51 on the second optical axis between an intersection of the object side surface of the fifth lens and the second optical axis and an apex of an effective radius of the object side surface of the fifth lens satisfy 1.43≤ET5 / |SAG51|≤2.

43. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ 2. The optical image pickup device according to claim 1, wherein ​ 3. The optical image pickup device according to claim 1, wherein ​ 4. The optical image pickup device according to claim 1, wherein ​ 5. The optical image pickup device according to claim 1, wherein ​ 6. The optical image pickup device according to claim 1, wherein ​ 7. The optical image pickup device according to claim 1, wherein A distance SAG61 on the second optical axis between an intersection of an object side surface of the sixth lens and the second optical axis to an apex of an effective radius of the object side surface of the sixth lens and a distance SAG62 on the second optical axis between an intersection of an image side surface of the sixth lens and the second optical axis to an apex of an effective radius of the image side surface of the sixth lens satisfy: 0.09≤|SAG61| / |SAG62|≤4.

02.

8. The optical image pickup device according to any one of claims 1 to 7, wherein A radius of curvature R2 of the image side surface of the first lens and a radius of curvature R3 of the object side surface of the second lens satisfy: 0.1 9. The optical image pickup device according to any one of claims 1 to 7, wherein, An effective focal length f1 of the first lens and an effective focal length f2 of the second lens satisfy: -2 10. The optical image pickup device according to any one of claims 1 to 7, wherein, The prism includes a reflection surface connecting the entrance surface and the exit surface, a distance G1 on the first optical axis between the entrance surface of the prism and the reflection surface of the prism, a distance G2 on the second optical axis between the reflection surface of the prism and the exit surface of the prism, and a distance TD on the second optical axis between the object side surface of the first lens and the image side surface of the seventh lens satisfy: 0.96≤(G1+G2) / TD<1.

2.

11. The optical image pickup device according to any one of claims 1 to 7, wherein A center thickness CT6 of the sixth lens on the second optical axis and a center thickness CT7 of the seventh lens on the second optical axis satisfy: 2.37≤CT7 / CT6≤8.

03.

12. The optical image pickup device according to any one of claims 1 to 7, wherein, An edge thickness ET2 of the second lens, a separation distance T12 on the second optical axis between the first lens and the second lens, a separation distance T23 on the second optical axis between the second lens and the third lens, and a center thickness CT2 of the second lens on the second optical axis satisfy: 1.73≤ET2 / (T12+CT2+T23)≤3.

83.

13. The optical image pickup device according to any one of claims 1 to 7, wherein, A radius of curvature R6 of the image side surface of the third lens, a radius of curvature R7 of the object side surface of the fourth lens, and a total effective focal length f of the optical image capturing device satisfy: -0.90≤(R6+R7) / f≤6.

60.

14. The optical image pickup device according to any one of claims 1 to 7, wherein, The total effective focal length f of the optical image capturing device and a combined focal length f56 of the fifth lens and the sixth lens satisfy: 0.31≤f / |f56|≤4.

18.

15. The optical image pickup device according to any one of claims 1 to 7, wherein, A radius of curvature R5 of the object side surface of the third lens, a radius of curvature R6 of the image side surface of the third lens, and a radius of curvature R7 of the object side surface of the fourth lens satisfy: 0.58≤(R5+R6) / |R7|≤15.

67.

16. The optical image pickup device according to any one of claims 1 to 7, wherein Among the first lens to the seventh lens, there is a lens with an Abbe number less than 20.

Images