Camera Optical Lens

Abstract

The present application discloses a camera optical lens, which comprises, from the object side to the image side, an optical inflection element and a second lens with optical focal length, wherein the optical inflection element has optical focal length and has an incident surface, a reflection surface and an exit surface, the incident surface and the exit surface are both aspherical mirror surfaces, the reflection surface is a plane mirror surface, and the optical inflection element is configured so that light incident on the optical inflection element through the incident surface along the direction of the Y optical axis is reflected by the reflection surface and then emitted through the exit surface along the direction of the X optical axis, wherein the direction of the Y optical axis intersects with the direction of the X optical axis; and a second lens with optical focal length, wherein the total effective focal length f of the camera optical lens can satisfy 20mm≤f≤30mm.

Description

Technical Field

[0001] The present application relates to a camera optical lens, and more specifically, to a camera optical lens comprising two lenses. Background Art

[0002] With the rapid development of the smartphone industry, mobile phone lenses are developing in the direction of high resolution, large field of view, light weight and versatility. This requires the optical system of mobile phone lenses to have multiple characteristics such as large aperture, long focal length, wide field of view, compact structure, high image quality and low distortion. In the face of these high requirements, the system of mobile phone lenses is becoming more and more complex, from 4 or 5 lenses in the beginning to 7 or 8 lenses now, especially for telephoto lenses, which usually increase the number of lenses to take into account both telephoto characteristics and high imaging quality.

[0003] However, the increase in system lenses is more complicated and difficult, both in terms of early optimization and later manufacturing. How to use fewer lenses to manufacture a telephoto lens with high imaging quality is one of the mainstream research directions in this field. Summary of the invention

[0004] The present application provides a camera optical lens applicable to portable electronic products, which can at least solve or partially solve at least one of the above-mentioned shortcomings in the prior art, for example, a lens that realizes telephoto characteristics by combining a prism and a lens.

[0005] The present application provides a camera optical lens, which includes, from the object side to the image side, an optical inflection element and a second lens with optical focal length, wherein the optical inflection element has optical focal length and has an incident surface, a reflection surface and an exit surface, the incident surface and the exit surface are both aspherical mirror surfaces, the reflection surface is a plane mirror surface, and the optical inflection element is configured so that light incident on the optical inflection element through the incident surface along the direction of the Y optical axis is reflected by the reflection surface and then emitted through the exit surface along the direction of the X optical axis, wherein the direction of the Y optical axis intersects with the direction of the X optical axis; and a second lens with optical focal length.

[0006] In one embodiment, the total effective focal length f of the camera optical lens may satisfy 20 mm ≤ f ≤ 30 mm.

[0007] In one embodiment, the Y optical axis is substantially perpendicular to the X optical axis.

[0008] In one embodiment, the camera optical lens further includes an aperture arranged between the object side and the optical path turning element, and a distance EPP from the aperture to the incident surface of the optical path turning element on the X-axis may satisfy 0mm<EPP<0.1mm.

[0009] In one embodiment, the total effective focal length f of the camera optical lens and the distance BFL from the image side surface of the second lens to the imaging surface of the camera optical lens on the X-axis may satisfy 1<f / BFL<1.5.

[0010] In one embodiment, the total effective focal length f of the camera optical lens and the effective focal length f1 of the optical path turning element may satisfy 1.5<f / f1<2.0.

[0011] In one embodiment, the total effective focal length f of the camera optical lens and the effective focal length f2 of the second lens may satisfy -1.0<f / f2<-0.5.

[0012] In one embodiment, the entrance pupil diameter EPD of the camera optical lens and half the diagonal length of the effective pixel area on the imaging surface of the camera optical lens ImgH may satisfy 2.0<EPD / ImgH≤3.0.

[0013] In one embodiment, the Abbe number V1 of the optical path turning element and the Abbe number V2 of the second lens may satisfy 50<(V1+V2) / 2<55.

[0014] In one embodiment, the refractive index N1 of the optical path turning element and the refractive index N2 of the second lens may satisfy 0.15≤N2-N1<0.3.

[0015] In one embodiment, the total effective focal length f of the camera optical lens and the center thickness CT2 of the second lens on the X-axis may satisfy 10≤f / CT2≤17.

[0016] The present application adopts two lenses (i.e., a prism and a lens), and through the reasonable allocation of the optical focal length, surface shape, center thickness of each lens and the on-axis spacing between each lens, the above-mentioned camera optical lens has at least one beneficial effect such as long focal length, miniaturization, and high imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] 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:

[0018] Figure 1 A schematic structural diagram of an imaging optical lens according to Embodiment 1 of the present application is shown;

[0019] FIG. 2A to FIG. 2D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical lens of Example 1 are respectively shown;

[0020] Figure 3 A schematic structural diagram of an imaging optical lens according to Embodiment 2 of the present application is shown;

[0021] 4A to 4D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical lens of Example 2 are respectively shown;

[0022] Figure 5 A schematic structural diagram of an imaging optical lens according to Embodiment 3 of the present application is shown;

[0023] FIG. 6A to FIG. 6D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical lens of Example 3 are respectively shown;

[0024] Figure 7 A schematic structural diagram of an imaging optical lens according to Embodiment 4 of the present application is shown;

[0025] FIG. 8A to FIG. 8D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical lens of Example 4 are respectively shown;

[0026] Fig. 9 A schematic structural diagram of an imaging optical lens according to Embodiment 5 of the present application is shown; and

[0027] FIG. 10A to FIG. 10D The axial chromatic aberration curve, astigmatism curve, distortion curve and magnification chromatic aberration curve of the imaging optical lens of Example 5 are respectively shown. DETAILED DESCRIPTION

[0028] In order to better understand the present application, a more detailed description will be made of various aspects of the present application with reference to the accompanying drawings. It should be understood that these detailed descriptions are only descriptions of exemplary embodiments of the present application, and 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.

[0029] It should be noted that in this specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teaching of the present application, the second lens discussed below may also be referred to as the third lens or the fourth lens.

[0030] In the drawings, the thickness, size and shape of the lenses have been slightly exaggerated for ease of explanation. Specifically, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of the spherical or aspherical surfaces are not limited to the shapes of the spherical or aspherical surfaces shown in the drawings. The drawings are only examples and are not drawn strictly to scale.

[0031] In this article, the paraxial region refers to the region near the X-ray axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region; if the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object side is called the object side surface of the lens, and the surface of each lens closest to the image side is called the image side surface of the lens.

[0032] It should also be understood that the terms "comprises", "including", "having", "includes" and / or "comprising", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire listed features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0033] Unless otherwise defined, all terms (including technical terms and scientific terms) used in this article have the same meaning as commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that terms (such as terms defined in commonly used dictionaries) should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined in this article.

[0034] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present 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.

[0035] The features, principles and other aspects of the present application are described in detail below.

[0036] The camera optical lens according to the exemplary embodiment of the present application may include an optical path turning element with optical power and a second lens with optical power in sequence from the object side to the image side. In the present application, there may be an air gap between the optical path turning element and the second lens. Since only one conventional lens (i.e., the second lens) is used in the entire camera optical lens, the camera optical lens can have a simpler structure than an ordinary mobile phone lens.

[0037] According to an exemplary embodiment of the present application, the optical path turning element may have positive optical power, and its incident surface may be a convex surface, and its exit surface may be a convex surface.

[0038] According to an exemplary embodiment of the present application, the second lens may have negative refractive power, the object-side surface thereof may be a concave surface, and the image-side surface thereof may be a convex surface.

[0039] According to an exemplary embodiment of the present application, the optical path turning element may have an incident surface, a reflecting surface, and an emitting surface. When the light from the subject enters the optical path turning element via the incident surface along the direction of the Y optical axis, it can be totally reflected by the reflecting surface and turned to the emitting surface to emit along the direction of the X optical axis, and pass through the second lens E2, and finally form an image on the imaging surface. Among them, the Y optical axis is approximately perpendicular to the X optical axis. And the reflecting surface passes through the intersection of the Y optical axis and the X optical axis. That is, the optical path turning element can be configured as a reflex prism that can deflect the light incident thereto by 90°. Compared with conventional prisms, the use of such prisms can not only reduce the loss of light energy in the optical system, but also participate in the imaging of the entire optical system, so that the entire optical system can meet the requirements of small system size and compact structure while meeting the characteristics of ultra-long effective focal length and high image quality.

[0040] In the embodiments of the present application, at least one of the incident surface and the exit surface of each lens is an aspherical mirror surface, that is, at least one of the incident surface and the exit surface of the optical path turning element and the object side surface and the image side surface of the second 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 having 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 occurring during imaging can be eliminated as much as possible, thereby improving the imaging quality.

[0041] In an exemplary embodiment, both the incident surface and the exit surface of the optical path turning element can be aspherical mirror surfaces, and its reflection surface is a plane mirror surface. Setting both the incident surface and the exit surface of the optical path turning element as aspherical mirror surfaces can reduce the loss of light energy in the optical system and help the telephoto ratio of the system.

[0042] In an exemplary embodiment, the camera optical lens of the present application can satisfy the conditional expression 20mm≤f≤30mm, where f is the total effective focal length of the camera optical lens. Satisfying the conditional expression 20mm≤f≤30mm can meet the requirement of ultra-long effective focal length; at the same time, due to the use of the optical path turning element, a smaller number of conventional lenses can be used to make the structure simple, thereby also meeting the requirements of small system size and compact structure.

[0043] In an exemplary embodiment, the camera optical lens of the present application may further include an aperture to improve the imaging quality of the lens. Optionally, the aperture may be set between the object and the optical path turning element. The camera optical lens according to the present application may satisfy the conditional formula 0mm<EPP<0.1mm, wherein EPP is the distance from the aperture to the incident surface of the optical path turning element on the X-ray axis. More specifically, EPP may further satisfy 0mm<EPP<0.05mm, for example, EPP=0.03mm. Setting the aperture on the incident surface of the optical path turning element can control the amount of light entering the entire camera optical system; at the same time, by selecting a suitable aperture position, the aberrations (coma, astigmatism, distortion and axial chromatic aberration) of the camera optical lens related to the aperture can be effectively corrected.

[0044] In an exemplary embodiment, the camera optical lens of the present application may satisfy the conditional formula 1<f / BFL<1.5, wherein f is the total effective focal length of the camera optical lens, and BFL is the distance from the image side surface of the second lens to the imaging surface of the camera optical lens on the X-ray axis. More specifically, f and BFL may further satisfy 1.17≤f / BFL≤1.22. Satisfying the conditional formula 1<f / BFL<1.5 allows the camera optical lens to have an ultra-long effective focal length and an ultra-long back focus, which facilitates the assembly of the lens module in the later stage.

[0045] In an exemplary embodiment, the camera optical lens of the present application may satisfy the conditional formula 1.5<f / f1<2.0, wherein f is the total effective focal length of the camera optical lens, and f1 is the effective focal length of the optical path turning element. More specifically, f and f1 may further satisfy 1.59≤f / f1≤1.90. Satisfying the conditional formula 1.5<f / f1<2.0 can effectively control the contribution of the effective focal length of the optical path turning element to the total effective focal length of the entire lens, thereby making the total effective focal length of the lens reach a larger ideal value.

[0046] In an exemplary embodiment, the imaging optical lens of the present application may satisfy the conditional formula -1.0<f / f2<-0.5, wherein f is the total effective focal length of the imaging optical lens, and f2 is the effective focal length of the second lens. More specifically, f and f2 may further satisfy -0.93≤f / f2≤-0.61. Satisfying the conditional formula -1.0<f / f2<-0.5 can effectively control the contribution of the effective focal length of the second lens to the total effective focal length of the entire lens, thereby making the total effective focal length of the lens reach a larger ideal value.

[0047] In an exemplary embodiment, the camera optical lens of the present application may satisfy the conditional formula 2.0<EPD / ImgH≤3.0, wherein EPD is the entrance pupil diameter of the camera optical lens, and ImgH is half the diagonal length of the effective pixel area on the imaging surface of the camera optical lens. More specifically, EPD and ImgH may further satisfy 2.29≤EPD / ImgH≤2.98. Satisfying the conditional formula 2.0<EPD / ImgH≤3.0 allows the lens to have a larger field of view while meeting the performance of large aperture and high image quality.

[0048] In an exemplary embodiment, the camera optical lens of the present application may satisfy the conditional formula 50<(V1+V2) / 2<55, wherein V1 is the Abbe number of the optical path turning element, and V2 is the Abbe number of the second lens. More specifically, V1 and V2 may further satisfy 51.17≤(V1+V2) / 2≤54.08. Satisfying the conditional formula 50<(V1+V2) / 2<55 makes the Abbe numbers of the two optical elements within the required specific range, thereby being able to strongly correct the vertical axis chromatic aberration, axial chromatic aberration and spherical aberration of the lens, thereby being able to better guarantee the image quality of the lens.

[0049] In an exemplary embodiment, the camera optical lens of the present application may satisfy the conditional formula 0.15≤N2-N1<0.3, wherein N1 is the refractive index of the optical path turning element, and N2 is the refractive index of the second lens. More specifically, N2 and N1 may further satisfy 0.16≤N2-N1≤0.24. By controlling the difference in the refractive index between the optical path turning element and the second lens within a relatively small range, the materials of the various lenses of the lens may be reasonably selected, and the difference in the optical power of the lenses may be controlled so that the effective focal length can reach the required value, while also ensuring that the lens has the advantages of high image quality and small aberrations.

[0050] In an exemplary embodiment, the imaging optical lens of the present application may satisfy the conditional formula 10≤f / CT2≤17, wherein f is the total effective focal length of the imaging optical lens, and CT2 is the center thickness of the second lens on the X-axis. More specifically, f and CT2 may further satisfy 10.40≤f / CT2≤16.50. Satisfying the conditional formula 10≤f / CT2≤17 can ensure the effective focal length of the lens while satisfying processability.

[0051] According to the above-mentioned embodiment of the present application, the camera optical lens can adopt the method of matching an optical turning element (i.e., a prism) with a conventional lens, such as the method described above, using a prism and a conventional lens. By reasonably allocating the focal length, surface shape, center thickness of each lens, and axial spacing between the lenses of the two optical elements, the size of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the camera optical lens is more conducive to production and processing and can be applied to portable electronic products. The camera optical lens with the above configuration can also have the beneficial effects of long focal length, miniaturization, high imaging quality, etc.

[0052] However, it should be understood by those skilled in the art that, without departing from the technical solution claimed in the present application, the number of prisms or lenses constituting the camera optical lens can be changed to obtain the various results and advantages described in this specification. For example, although two lenses are described as an example in the embodiment, the camera optical lens is not limited to including two lenses. If necessary, the camera optical lens may also include other numbers of lenses.

[0053] Specific embodiments of the imaging optical lens applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0054] Example 1

[0055] The following reference Figures 1 to 2D The imaging optical lens according to Embodiment 1 of the present application is described. Figure 1 A schematic structural diagram of an imaging optical lens according to Embodiment 1 of the present application is shown.

[0056] like Figure 1 As shown, the camera optical lens according to the exemplary embodiment of the present application includes, from the object side to the image side, an aperture STO, an optical path turning element E1, a second lens E2 and an imaging surface S6.

[0057] The optical path turning element E1 is a folding prism, which has positive optical power and has an incident surface S1, a reflection surface S2 and an exit surface S3, wherein the incident surface S1 is a convex surface, the reflection surface S2 is a plane, and the exit surface S3 is a convex surface. Light incident along the Y optical axis through the incident surface S1 is reflected by the reflection surface S2 and then exits along the X optical axis through the exit surface S3, wherein the Y optical axis is substantially perpendicular to the X optical axis and the reflection surface S2 passes through the intersection of the Y optical axis and the X optical axis. The second lens E2 has negative optical power, and its object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The light from the object passes through each surface S1 to S5 in sequence and is finally imaged on the imaging surface S6.

[0058] Table 1 shows the basic parameters of the imaging optical lens of Example 1, wherein the units of the curvature radius, thickness and focal length are all millimeters (mm).

[0059]

[0060] Table 1

[0061] Wherein, f is the total effective focal length of the camera optical lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface S6 of the camera optical lens.

[0062] In Example 1, the incident surface S1 and the exit surface S3 of the optical path turning element E1 and the object side surface and the image side surface of the second lens E2 are all aspherical surfaces, and the surface shape x of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0063]

[0064] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is 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 curvature radius R in Table 1 above); k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. Table 2 below gives the high-order coefficients A that can be used for each aspheric mirror surface S1, S3-S5 in Example 1 4 , A 6 , A 8 , A 10 , A 12 , A 14 , A 16 , A 18 , A 20 , A 22 , A 24 , A 26 , A 28 and A 30 .

[0065]

[0066] Table 2

[0067] Figure 2A The axial chromatic aberration curve of the imaging optical lens of Example 1 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 2B The astigmatism curve of the imaging optical lens of Example 1 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 2C The distortion curve of the imaging optical lens of Example 1 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 2D The magnification chromatic aberration curve of the imaging optical lens of Example 1 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 2A to FIG. 2DIt can be seen that the camera optical lens provided in Example 1 can achieve good imaging quality.

[0068] Example 2

[0069] The following reference Figures 3 to 4D The imaging optical lens according to Embodiment 2 of the present application is described. In this embodiment and the following embodiments, for the sake of brevity, some descriptions similar to Embodiment 1 will be omitted. Figure 3 A schematic structural diagram of an imaging optical lens according to Embodiment 2 of the present application is shown.

[0070] like Figure 3 As shown, the camera optical lens according to the exemplary embodiment of the present application includes, from the object side to the image side, an aperture STO, an optical path turning element E1, a second lens E2 and an imaging surface S6.

[0071] The optical path turning element E1 is a folding prism, which has positive optical power and has an incident surface S1, a reflection surface S2 and an exit surface S3, wherein the incident surface S1 is a convex surface, the reflection surface S2 is a plane, and the exit surface S3 is a convex surface. Light incident along the Y optical axis through the incident surface S1 is reflected by the reflection surface S2 and then exits along the X optical axis through the exit surface S3, wherein the Y optical axis is substantially perpendicular to the X optical axis and the reflection surface S2 passes through the intersection of the Y optical axis and the X optical axis. The second lens E2 has negative optical power, and its object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The light from the object passes through each surface S1 to S5 in sequence and is finally imaged on the imaging surface S6.

[0072] Table 3 shows the basic parameters of the camera optical lens of Example 2, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 4 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 2, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0073]

[0074] Table 3

[0075]

[0076] Table 4

[0077] Figure 4A The axial chromatic aberration curve of the imaging optical lens of Example 2 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 4B The astigmatism curve of the imaging optical lens of Example 2 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 4C The distortion curve of the imaging optical lens of Example 2 is shown, which indicates the distortion magnitude values ​​corresponding to different field angles. Figure 4DThe magnification chromatic aberration curve of the imaging optical lens of Example 2 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. 4A to 4D It can be seen that the camera optical lens provided in Example 2 can achieve good imaging quality.

[0078] Example 3

[0079] The following reference Figures 5 to 6D The imaging optical lens according to Embodiment 3 of the present application is described. Figure 5 A schematic structural diagram of an imaging optical lens according to Embodiment 3 of the present application is shown.

[0080] like Figure 5 As shown, the camera optical lens according to the exemplary embodiment of the present application includes, from the object side to the image side, an aperture STO, an optical path turning element E1, a second lens E2 and an imaging surface S6.

[0081] The optical path turning element E1 is a folding prism, which has positive optical power and has an incident surface S1, a reflection surface S2 and an exit surface S3, wherein the incident surface S1 is a convex surface, the reflection surface S2 is a plane, and the exit surface S3 is a convex surface. Light incident along the Y optical axis through the incident surface S1 is reflected by the reflection surface S2 and then exits along the X optical axis through the exit surface S3, wherein the Y optical axis is substantially perpendicular to the X optical axis and the reflection surface S2 passes through the intersection of the Y optical axis and the X optical axis. The second lens E2 has negative optical power, and its object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The light from the object passes through each surface S1 to S5 in sequence and is finally imaged on the imaging surface S6.

[0082] Table 5 shows the basic parameters of the camera optical lens of Example 3, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 6 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 3, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0083]

[0084] Table 5

[0085]

[0086] Table 6

[0087] Fig. 6A The axial chromatic aberration curve of the imaging optical lens of Example 3 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 6B The astigmatism curve of the imaging optical lens of Example 3 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 6CThe distortion curve of the camera optical lens of Example 3 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.6D The magnification chromatic aberration curve of the camera optical lens of Example 3 is shown, which represents the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 6A to FIG. 6D It can be seen that the camera optical lens provided in Example 3 can achieve good imaging quality.

[0088] Example 4

[0089] The following reference Figures 7 to 8D The imaging optical lens according to Embodiment 4 of the present application is described. Figure 7 A schematic structural diagram of an imaging optical lens according to Embodiment 4 of the present application is shown.

[0090] like Figure 7 As shown, the camera optical lens according to the exemplary embodiment of the present application includes, from the object side to the image side, an aperture STO, an optical path turning element E1, a second lens E2 and an imaging surface S6.

[0091] The optical path turning element E1 is a folding prism, which has positive optical power and has an incident surface S1, a reflection surface S2 and an exit surface S3, wherein the incident surface S1 is a convex surface, the reflection surface S2 is a plane, and the exit surface S3 is a convex surface. Light incident along the Y optical axis through the incident surface S1 is reflected by the reflection surface S2 and then exits along the X optical axis through the exit surface S3, wherein the Y optical axis is substantially perpendicular to the X optical axis and the reflection surface S2 passes through the intersection of the Y optical axis and the X optical axis. The second lens E2 has negative optical power, and its object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The light from the object passes through each surface S1 to S5 in sequence and is finally imaged on the imaging surface S6.

[0092] Table 7 shows the basic parameter table of the camera optical lens of Example 4, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 8 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 4, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above-mentioned Example 1.

[0093]

[0094] Table 7

[0095]

[0096] Table 8

[0097] Fig. 8A The axial chromatic aberration curve of the imaging optical lens of Example 4 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Figure 8BThe astigmatism curve of the imaging optical lens of Example 4 is shown, which indicates the meridional field curvature and the sagittal field curvature. Figure 8C The distortion curve of the camera optical lens of Example 4 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig.8D The magnification chromatic aberration curve of the imaging optical lens of Example 4 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 8A to FIG. 8D It can be seen that the camera optical lens provided in Example 4 can achieve good imaging quality.

[0098] Example 5

[0099] The following reference Figures 9 to 10D The imaging optical lens according to Embodiment 5 of the present application is described. Fig. 9 A schematic structural diagram of an imaging optical lens according to Example 5 of the present application is shown.

[0100] like Fig. 9 As shown, the camera optical lens according to the exemplary embodiment of the present application includes, from the object side to the image side, an aperture STO, an optical path turning element E1, a second lens E2 and an imaging surface S6.

[0101] The optical path turning element E1 is a folding prism, which has positive optical power and has an incident surface S1, a reflection surface S2 and an exit surface S3, wherein the incident surface S1 is a convex surface, the reflection surface S2 is a plane, and the exit surface S3 is a convex surface. Light incident along the Y optical axis through the incident surface S1 is reflected by the reflection surface S2 and then exits along the X optical axis through the exit surface S3, wherein the Y optical axis is substantially perpendicular to the X optical axis and the reflection surface S2 passes through the intersection of the Y optical axis and the X optical axis. The second lens E2 has negative optical power, and its object side surface S4 is a concave surface, and the image side surface S5 is a convex surface. The light from the object passes through each surface S1 to S5 in sequence and is finally imaged on the imaging surface S6.

[0102] Table 9 shows the basic parameter table of the camera optical lens of Example 5, wherein the units of the radius of curvature, thickness and focal length are all in millimeters (mm). Table 10 shows the high-order coefficients of each aspherical mirror surface that can be used in Example 5, wherein the surface type of each aspherical surface can be defined by the formula (1) given in the above Example 1.

[0103]

[0104] Table 9

[0105]

[0106] Table 10

[0107] Fig. 10AThe axial chromatic aberration curve of the imaging optical lens of Example 5 is shown, which indicates the deviation of light of different wavelengths from the focal point behind the lens. Fig. 10B The astigmatism curve of the imaging optical lens of Example 5 is shown, which indicates the meridional field curvature and the sagittal field curvature. Fig. 10C The distortion curve of the camera optical lens of Example 5 is shown, which represents the distortion magnitude values ​​corresponding to different field angles. Fig. 10D The magnification chromatic aberration curve of the imaging optical lens of Example 5 is shown, which indicates the deviation of different image heights on the imaging surface after the light passes through the lens. FIG. 10A to FIG. 10D It can be seen that the camera optical lens provided in Example 5 can achieve good imaging quality.

[0108] In summary, Examples 1 to 5 respectively satisfy the relationships shown in Table 11.

[0109] Conditional / Example 1 2 3 4 5 EPP(mm) 0.03 0.03 0.03 0.03 0.03 f / BFL 1.22 1.22 1.22 1.17 1.20 f / f1 1.90 1.90 1.66 1.59 1.62 f / f2 -0.93 -0.93 -0.69 -0.61 -0.64 EPD / ImgH 2.84 2.98 2.39 2.29 2.29 (V1+V2) / 2 54.08 54.08 53.58 51.17 51.17 N2-N1 0.16 0.16 0.21 0.24 0.24 f / CT2 10.40 10.40 11.51 16.50 13.25

[0110] Table 11

[0111] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the above-described camera optical lens.

[0112] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A camera optical lens, characterized in that: From the object side to the image side, they include: An optical path turning element having positive optical power and having an incident surface, a reflecting surface and an exiting surface, wherein the incident surface and the exiting surface are both aspherical mirror surfaces, and the incident surface is a convex surface, the exiting surface is a convex surface, the reflecting surface is a plane mirror surface, and the optical path turning element is configured such that light incident on the optical path turning element through the incident surface along the direction of the Y optical axis is reflected by the reflecting surface and then exits through the exiting surface along the direction of the X optical axis, wherein the direction of the Y optical axis intersects the direction of the X optical axis; and The second lens has negative optical power, its object side surface is concave, and its image side surface is convex; Wherein, the number of optical elements with optical power in the camera optical lens is two; The total effective focal length f of the imaging optical lens and the distance BFL from the image side surface of the second lens to the imaging surface of the imaging optical lens on the X-ray axis satisfy 1.17≤f / BFL≤1.22; and The total effective focal length f of the camera optical lens satisfies 20mm≤f≤30mm.

2. The imaging optical lens according to claim 1, wherein: The Y optical axis is substantially perpendicular to the X optical axis.

3. The imaging optical lens according to claim 1, characterized in that: The camera optical lens further includes an aperture, which is arranged between the object side and the optical path turning element, and A distance EPP from the aperture to the incident surface of the optical path turning element on the X-ray axis satisfies 0mm<EPP≤0.03mm.

4. The imaging optical lens according to claim 1, wherein: The total effective focal length f of the camera optical lens and the effective focal length f1 of the optical path turning element satisfy 1.59≤f / f1≤1.

90.

5. The imaging optical lens according to claim 1, wherein: The total effective focal length f of the camera optical lens and the effective focal length f2 of the second lens satisfy -0.93≤f / f2≤-0.

61.

6. The imaging optical lens according to claim 1, characterized in that: An entrance pupil diameter EPD of the camera optical lens and half of the diagonal length of an effective pixel area on an imaging surface of the camera optical lens ImgH satisfy 2.29≤EPD / ImgH≤3.

0.

7. The imaging optical lens according to claim 1, characterized in that: The Abbe number V1 of the optical path turning element and the Abbe number V2 of the second lens satisfy 51.17≤(V1+V2) / 2≤54.

08.

8. The imaging optical lens according to claim 1, characterized in that: The refractive index N1 of the optical path turning element and the refractive index N2 of the second lens satisfy 0.15≤N2-N1≤0.

24.

9. The imaging optical lens according to claim 1, characterized in that: The total effective focal length f of the camera optical lens and the center thickness CT2 of the second lens on the X-axis satisfy 10.40≤f / CT2≤16.50.

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