Vertical long-focus optical lens

Abstract

The invention relates to the technical field of optical lenses, in particular to a vertical long-focus optical lens, which sequentially comprises a first lens group with positive focal power, a second lens group with negative focal power, a third lens group with positive focal power, a fourth lens group with negative focal power and a fifth lens group with negative focal power from an object side to an image side along an optical axis, the second lens group has negative focal power, and the second lens group is provided with two or three lenses; the prism is used for changing the light emitting angle, and the total height of the telephoto lens module is smaller than or equal to 9.3 mm; object distance switching is realized by adjusting the spacing distance between the first lens group and the second lens group on the optical axis and the spacing distance between the second lens group and the prism on the optical axis; the equivalent focal length of the lens is Fgt; the thickness is 70 mm. The zoom position is reasonably matched, and the focal power and the surface type of the lens are controlled, so that a good photographing effect under different object distances is achieved while the height of the module is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of optical lenses, and in particular to a vertical telephoto optical lens. Background Art

[0002] In recent years, as people's pursuit of technology has increased, users have higher and higher requirements for mobile phone telephoto, and expect that the lens can achieve good photography effects at close distances while meeting the telephoto requirements. Therefore, the demand for telephoto modules in mobile phones has continued to grow. The total length of previous telephoto lenses was too long, and it was difficult to compress the space of the lens, and it was impossible to achieve good effects for both long-distance and close-up photography. Therefore, it is urgent to design an optical lens that has good photography effects at different object distances and minimizes the lens volume. Summary of the invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an upright telephoto optical lens, including two lens groups and a prism. By reasonably coordinating the zoom position and controlling the optical focal length and surface shape of the lens, good photographic effects are achieved at different object distances while reducing the module height.

[0004] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0005] A vertical telephoto optical lens, the lens includes the following components from the object side to the image side along the optical axis:

[0006] A first lens group with positive optical power, the first lens group comprising a first lens and a second lens, the first lens having positive optical power, and the second lens having negative optical power;

[0007] a second lens group having negative power, the second lens group having 2 or 3 lenses; when the second lens group has 2 lenses, the second lens group includes a third lens and a fourth lens, the third lens has negative power, and the fourth lens has optical power; when the second lens group has 3 lenses, it further includes a fifth lens, and the fifth lens has positive power;

[0008] Prism, used to change the angle of light emission, the total height of the telephoto lens module is less than or equal to 9.3mm;

[0009] Adjusting the distance between the first lens group and the second lens group on the optical axis and the distance between the second lens group and the prism on the optical axis to achieve object distance switching;

[0010] The equivalent focal length F of the lens is >70mm.

[0011] The total height of the module is the distance from the center of the object side of the first lens to the edge of the image plane away from the first lens. By controlling the total height of the module, the size of the lens is effectively shortened to meet the miniaturization requirements. By controlling the equivalent focal length of the lens within a reasonable range, the shooting effect of the lens is improved while meeting the telephoto characteristics of the lens.

[0012] Furthermore, the second lens is an aspherical plastic lens, and the lenses included in the second lens group are all aspherical plastic lenses.

[0013] Furthermore, the lens satisfies the following conditional formula:

[0014] Fno<2.5

[0015] Among them, Fno is the F number of the lens.

[0016] By satisfying the above conditions, the exposure speed of the lens can be increased, the requirements for ambient light can be reduced, the relative brightness of the edge field of view can be increased, and the image quality can be improved.

[0017] Furthermore, the lens satisfies the following conditional formula:

[0018] -0.8 <F1 / F2<-0.6

[0019] Wherein, F1 is the effective focal length of the first lens group, and F2 is the effective focal length of the second lens group.

[0020] By satisfying the above conditional formula, the contribution of the aberrations of the two lens groups is controlled, which is beneficial to balancing the aberrations generated by the rear lens, so that the aberrations of the optical system are within a reasonable range, which is beneficial to making the lens have a higher resolution.

[0021] Furthermore, the lens satisfies the following conditional formula:

[0022] -5<(R4+R5) / (R4-R5)<-1

[0023] Wherein, R4 is the curvature radius of the object side of the second lens, and R5 is the curvature radius of the image side of the second lens.

[0024] By satisfying the above conditional formula and reasonably controlling the radius of curvature of the lens, the degree of deflection of light passing through the lens can be alleviated, effectively reducing aberrations while ensuring basic performance when switching object distances.

[0025] Furthermore, the lens satisfies the following conditional formula:

[0026] V1 / V2>2.5

[0027] Wherein, V1 and V2 are the dispersion coefficients of the first lens and the second lens respectively.

[0028] Satisfying the above conditional expression is helpful in balancing the chromatic aberration of the lens.

[0029] The beneficial effects of the present invention are:

[0030] The present invention provides a vertical telephoto lens, comprising two lens groups and a prism. By adjusting the distance between the first lens group and the second lens group, and the distance between the second lens group and the prism, switching between telephoto and close-up is achieved. By reasonably coordinating the zoom position and controlling the optical focal length and surface shape of the lens, the total length of the telephoto lens can be compressed, meeting the requirements of miniaturization and focusing within different object distances, and achieving good photographic effects at different object distances while reducing the module height. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the three-dimensional structure of a vertical telephoto lens of the present invention;

[0032] Figure 2 Schematic diagram of the telephoto state structure of Embodiment 1 of the present invention;

[0033] Figure 3 Schematic diagram of the close-up state structure of Embodiment 1 of the present invention;

[0034] Figure 4 is a distortion curve diagram of telephoto state of Example 1 of the present invention;

[0035] Figure 5 is a distortion curve diagram of close-up state of embodiment 1 of the present invention;

[0036] Figure 6 Schematic diagram of the telephoto state structure of Embodiment 2 of the present invention;

[0037] Figure 7 Schematic diagram of the close-up state structure of embodiment 2 of the present invention;

[0038] Figure 8 is a distortion curve diagram of telephoto state of Example 2 of the present invention;

[0039] Fig. 9 is a distortion curve diagram of close-up state of embodiment 2 of the present invention;

[0040] Fig.10 Schematic diagram of the telephoto state structure of Embodiment 3 of the present invention;

[0041] Fig.11 Schematic diagram of the close-up state structure of Embodiment 3 of the present invention;

[0042] Fig.12 is a distortion curve diagram of telephoto state of Example 3 of the present invention;

[0043] Fig.13is a distortion curve diagram of close-up state of embodiment 3 of the present invention;

[0044] Fig.14 Schematic diagram of the telephoto state structure of Embodiment 4 of the present invention;

[0045] Fig.15 Schematic diagram of the close-up state structure of Embodiment 4 of the present invention;

[0046] Fig.16 is a distortion curve diagram of telephoto state of Example 4 of the present invention;

[0047] Fig.17 This is a distortion curve diagram of the close-up state of Example 4 of the present invention.

[0048] In the figure: 1, first lens group; 11, first lens; 12, second lens; 2, second lens group; 21, third lens; 22, fourth lens; 23, fifth lens; 3, prism; 4, aperture; 5, filter. DETAILED DESCRIPTION

[0049] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0050] 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.

[0051] In this document, the surface of each lens closest to the object is called the object-side surface, and the surface of each lens closest to the imaging plane is called the image-side surface.

[0052] like Figure 1-17 As shown, an upright telephoto optical lens provided by an embodiment of the present invention includes the following components in order from the object side to the image side along the optical axis:

[0053] A first lens group 1 with positive refractive power, the first lens group comprising a first lens 11 and a second lens 12, the first lens 11 having positive refractive power, and the second lens 12 having negative refractive power;

[0054] A second lens group 2 having negative power, the second lens group 2 having 2 or 3 lenses; when the second lens group 2 has 2 lenses, the second lens group 2 includes a third lens 21 and a fourth lens 22, the third lens 21 has negative power, and the fourth lens 22 has positive power; when the second lens group 2 has 3 lenses, the second lens group 2 further includes a fifth lens 23, and the fifth lens 23 has positive power;

[0055] Prism 3, used to change the angle of light emission, the total height of the telephoto lens module is less than or equal to 9.3mm;

[0056] The object distance is switched by adjusting the distance between the first lens group 1 and the second lens group 2 on the optical axis and the distance between the second lens group 2 and the prism 3 on the optical axis;

[0057] The equivalent focal length F of the lens is >70mm.

[0058] The total height of the module is the distance from the center of the object side of the first lens 11 to the edge of the image plane away from the first lens 11. The total height of the module in each embodiment is higher than Figure 2 , 3 , 6, 7, 10, 11, 14 and 15 are indicated by arrows, and the length of the arrows is the total height of the module. By controlling the total height of the module, the size of the lens is effectively shortened to meet the miniaturization requirements. By controlling the equivalent focal length of the lens within a reasonable range, the shooting effect of the lens is improved while meeting the telephoto characteristics of the lens.

[0059] Specifically, the second lens 12 is an aspherical plastic lens, and the lenses included in the second lens group 2 are all aspherical plastic lenses.

[0060] Specifically, the lens satisfies the following conditional formula:

[0061] Fno<2.5

[0062] Among them, Fno is the F number of the lens.

[0063] By satisfying the above conditions, the exposure speed of the lens can be increased, the requirements for ambient light can be reduced, the relative brightness of the edge field of view can be increased, and the image quality can be improved.

[0064] Specifically, the lens satisfies the following conditional formula:

[0065] -0.8 <F1 / F2<-0.6

[0066] Wherein, F1 is the effective focal length of the first lens group 1 , and F2 is the effective focal length of the second lens group 2 .

[0067] By satisfying the above conditional formula, the contribution of the aberrations of the two lens groups is controlled, which is beneficial to balancing the aberrations generated by the rear lens, so that the aberrations of the optical system are within a reasonable range, which is beneficial to making the lens have a higher resolution.

[0068] Specifically, the lens satisfies the following conditional formula:

[0069] -5<(R4+R5) / (R4-R5)<-1

[0070] Wherein, R4 is the curvature radius of the object side surface of the second lens 12, and R5 is the curvature radius of the image side surface of the second lens 12.

[0071] By satisfying the above conditional formula and reasonably controlling the radius of curvature of the lens, the degree of deflection of light passing through the lens can be alleviated, effectively reducing aberrations while ensuring basic performance when switching object distances.

[0072] Specifically, the lens satisfies the following conditional formula:

[0073] V1 / V2>2.5

[0074] Wherein, V1 and V2 are the dispersion coefficients of the first lens 11 and the second lens 12 respectively.

[0075] Satisfying the above conditional expression is helpful in balancing the chromatic aberration of the lens.

[0076] The above-mentioned lens may further include a filter 5 for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface according to the specific needs of the embodiment. In the absence of specific requirements, the filter 5 or the protective glass may not be used.

[0077] In order to better understand the above technical solution, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the accompanying drawings, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a clearer and more thorough understanding of the present invention and to fully convey the scope of the present invention to those skilled in the art.

[0078] Example 1

[0079] This embodiment provides a vertical telephoto optical lens, which is composed of an aperture 4, a first lens 11, a second lens 12, a third lens 21, a fourth lens 22, a fifth lens 23, a prism 3 and a filter 5 in sequence from the object side to the image side along the optical axis, wherein the first lens 11 and the second lens 12 form a first lens group 1, and the third lens 21, the fourth lens 22 and the fifth lens 23 form a second lens group 2. The incident light passes through the above components in sequence and finally forms an image on the image plane. The distance between the first lens group 1 and the second lens group 2 on the optical axis and the distance between the second lens group 2 and the prism 3 on the optical axis are changed to achieve the switching of the object distance between telephoto and close-up.

[0080] The first lens 11 has positive optical power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The second lens 12 has negative optical power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 21 has negative optical power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 22 has negative optical power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fifth lens 23 has positive optical power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The prism 3 is a right-angle prism, which turns the optical axis 90 degrees, and the filter 5 is arranged between the light exit surface of the prism 3 and the imaging surface of the lens.

[0081] Table 1 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 1. The units of the radius of curvature and thickness are both millimeters (mm).

[0082] Table 1 is a table of lens parameters of the lens of Example 1.

[0083]

[0084] In this embodiment, the surface shape x of each aspheric lens can be defined by, but not limited to, the following aspheric surface formula:

[0085]

[0086] 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; A i The following Table 2 shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 of the aspheric mirror surfaces that can be used in Example 1.

[0087] Table 2 is a table of high-order coefficients of various aspherical mirror surfaces in Example 1.

[0088]

[0089] Table 3 shows the distance values ​​of the lens in the close-up state and the telephoto state, where D0 is the object distance, D6 is the spacing distance between the first lens group 1 and the second lens group 2 on the optical axis, and D13 is the spacing distance between the second lens group 2 and the prism 3 on the optical axis, all in millimeters (mm).

[0090] Table 3 is a table of lens parameters for close-up and telephoto states.

[0091] parameter Telephoto state Close-up state D0 Infinity 120 D6 0 0.51 D13 0 -0.51

[0092] Please refer to Table 13 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0093] The specific lens structure of this embodiment in the close-up state and the telephoto state is as follows: Figure 2 and Figure 3 As shown in Table 1-3 and Figure 2-5 The optical lens performance and group travel of the current embodiment are shown, indicating that the lens reduces the module height while having good photographic effects at different object distances.

[0094] Example 2

[0095] This embodiment provides a vertical telephoto optical lens, which is composed of an aperture 4, a first lens 11, a second lens 12, a third lens 21, a fourth lens 22, a fifth lens 23, a prism 3 and a filter 5 in sequence from the object side to the image side along the optical axis, wherein the first lens 11 and the second lens 12 form a first lens group 1, and the third lens 21, the fourth lens 22 and the fifth lens 23 form a second lens group 2. The incident light passes through the above components in sequence and finally forms an image on the image plane. The distance between the first lens group 1 and the second lens group 2 on the optical axis and the distance between the second lens group 2 and the prism 3 on the optical axis are changed to achieve the switching of the object distance between telephoto and close-up.

[0096] The first lens 11 has positive optical power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The second lens 12 has negative optical power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 21 has negative optical power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 22 has negative optical power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fifth lens 23 has positive optical power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The prism 3 is a right-angle prism, which turns the optical axis 90 degrees, and the filter 5 is arranged between the light exit surface of the prism 3 and the imaging surface of the lens.

[0097] Table 4 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 2. The units of the radius of curvature and thickness are both millimeters (mm).

[0098] Table 4 is a table of lens parameters of Example 2.

[0099]

[0100] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 5 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 of each aspheric mirror surface that can be used in embodiment 2.

[0101] Table 5 is a table of high-order coefficients of each aspherical mirror surface in Example 2.

[0102]

[0103] Table 6 shows the distance values ​​of the close-up state and the telephoto state of the lens, where D0 is the object distance, D6 is the spacing distance between the first lens group 1 and the second lens group 2 on the optical axis, and D13 is the spacing distance between the second lens group 2 and the prism 3 on the optical axis, all in millimeters (mm).

[0104] Table 6 is a table of lens parameters for close-up and telephoto states.

[0105] parameter Telephoto state Close-up state D0 Infinity 120 D6 0 0.46 D13 0 -0.46

[0106] Please refer to Table 13 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0107] The specific lens structure of this embodiment in the close-up state and the telephoto state is as follows: Figure 6 and Figure 7 Table 4-6 and Figure 6-9 The optical lens performance and group travel of the current embodiment are shown, indicating that the lens reduces the module height while having good photographic effects at different object distances.

[0108] Example 3

[0109] This embodiment provides a vertical telephoto optical lens, which is composed of an aperture 4, a first lens 11, a second lens 12, a third lens 21, a fourth lens 22, a fifth lens 23, a prism 3 and a filter 5 in sequence from the object side to the image side along the optical axis, wherein the first lens 11 and the second lens 12 form a first lens group 1, and the third lens 21, the fourth lens 22 and the fifth lens 23 form a second lens group 2. The incident light passes through the above components in sequence and finally forms an image on the image plane. The distance between the first lens group 1 and the second lens group 2 on the optical axis and the distance between the second lens group 2 and the prism 3 on the optical axis are changed to achieve the switching of the object distance between telephoto and close-up.

[0110] The first lens 11 has positive optical power, and its object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The second lens 12 has negative optical power, and its object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 21 has negative optical power, and its object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 22 has negative optical power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The fifth lens 23 has positive optical power, and its object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The prism 3 is a right-angle prism, which turns the optical axis 90 degrees, and the filter 5 is arranged between the light exit surface of the prism 3 and the imaging surface of the lens.

[0111] Table 7 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 3. The units of the radius of curvature and thickness are both millimeters (mm).

[0112] Table 7 is a table of lens parameters of Example 3.

[0113]

[0114] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 8 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 of each aspheric mirror surface that can be used in embodiment 3.

[0115] Table 8 is a table of high-order coefficients of each aspherical mirror surface in Example 3.

[0116]

[0117] Table 9 shows the distance values ​​of the close-up state and the telephoto state of the lens, where D0 is the object distance, D6 is the spacing distance between the first lens group 1 and the second lens group 2 on the optical axis, and D13 is the spacing distance between the second lens group 2 and the prism 3 on the optical axis, and the units are all millimeters (mm).

[0118] Table 9 is a table of lens parameters for close-up and telephoto states.

[0119] parameter Telephoto state Close-up state D0 Infinity 120 D6 0 0.46 D13 0 -0.46

[0120] Please refer to Table 13 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0121] The specific lens structure of this embodiment in the close-up state and the telephoto state is as follows: Fig.10 and Fig.11 Table 7-9 and Figure 10-13 The optical lens performance and group travel of the current embodiment are shown, indicating that the lens reduces the module height while having good photographic effects at different object distances.

[0122] Example 4

[0123] This embodiment provides a vertical telephoto optical lens, which is composed of an aperture 4, a first lens 11, a second lens 12, a third lens 21, a fourth lens 22, a prism 3 and a filter 5 in sequence from the object side to the image side along the optical axis, wherein the first lens 11 and the second lens 12 form a first lens group 1, and the third lens 21 and the fourth lens 22 form a second lens group 2. The incident light passes through the above components in sequence and finally forms an image on the image plane. The distance between the first lens group 1 and the second lens group 2 on the optical axis and the distance between the second lens group 2 and the prism 3 on the optical axis are changed to achieve the switching of the object distance between telephoto and close-up.

[0124] The first lens 11 has positive optical power, and its object side surface is convex at the near optical axis, and its image side surface is concave at the near optical axis. The second lens 12 has negative optical power, and its object side surface is concave at the near optical axis, and its image side surface is convex at the near optical axis. The third lens 21 has negative optical power, and its object side surface is concave at the near optical axis, and its image side surface is convex at the near optical axis. The fourth lens 22 has positive optical power, and its object side surface is convex at the near optical axis, and its image side surface is concave at the near optical axis. The prism 3 is a right-angle prism, which turns the optical axis 90 degrees, and the filter 5 is arranged between the light exit surface of the prism 3 and the imaging surface of the lens.

[0125] Table 10 shows the surface type, radius of curvature, thickness and material properties of each lens in Example 4. The units of the radius of curvature and thickness are both millimeters (mm).

[0126] Table 10 is a table of lens parameters of Example 4.

[0127]

[0128]

[0129] In this embodiment, each aspheric surface shape can be defined by the formula (1) in the above embodiment 1. Table 11 below shows the high-order coefficients A4, A6, A8, A10, A12, A14, A16, and A18 of each aspheric mirror surface that can be used in embodiment 4.

[0130] Table 11 is a table of high-order coefficients of each aspherical mirror surface in Example 4.

[0131]

[0132] Table 12 shows the distance values ​​of the lens in the close-up state and the telephoto state, where D0 is the object distance, D6 is the spacing distance between the first lens group 1 and the second lens group 2 on the optical axis, and D13 is the spacing distance between the second lens group 2 and the prism 3 on the optical axis, and the units are all millimeters (mm).

[0133] Table 12 is a table of lens parameters for close-up and telephoto states.

[0134] parameter Telephoto state Close-up state D0 Infinity 120 D6 0 0.551 D13 0 -0.551

[0135] Please refer to Table 13 for the numerical values ​​of the relevant conditional expressions of this embodiment.

[0136] The specific lens structure of this embodiment in the close-up state and the telephoto state is as follows: Fig.14 and Fig.15 Table 10-12 and Figure 14-17The lens shape and various properties of the lens of the current embodiment are shown, indicating that the lens reduces the module height while having good photographic effects at different object distances.

[0137] Table 13 is a numerical table of conditional formulas related to Examples 1-4.

[0138]

[0139]

[0140] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may alter, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A vertical telephoto optical lens, characterized in that: The lens includes the following components along the optical axis from the object side to the image side: A first lens group with positive optical power, the first lens group comprising a first lens and a second lens, the first lens having positive optical power, and the second lens having negative optical power; a second lens group having negative power, the second lens group having 2 or 3 lenses; when the second lens group has 2 lenses, the second lens group includes a third lens and a fourth lens, the third lens has negative power, and the fourth lens has optical power; when the second lens group has 3 lenses, it further includes a fifth lens, and the fifth lens has positive power; Prism, used to change the angle of light emission, the total height of the telephoto lens module is less than or equal to 9.3mm; Adjusting the distance between the first lens group and the second lens group on the optical axis and the distance between the second lens group and the prism on the optical axis to achieve object distance switching; The equivalent focal length F of the lens is >70mm.

2. The upright telephoto optical lens according to claim 1, characterized in that: The second lens is an aspherical plastic lens, and all lenses included in the second lens group are aspherical plastic lenses.

3. The upright telephoto optical lens according to claim 1, characterized in that: The lens satisfies the following conditional formula: Fno<2.5 Wherein, Fno is the F number of the lens.

4. The upright telephoto optical lens according to claim 1, characterized in that: The lens satisfies the following conditional formula: -0.8 <F1 / F2<-0.6 Wherein, F1 is the effective focal length of the first lens group, and F2 is the effective focal length of the second lens group.

5. The upright telephoto optical lens according to claim 1, characterized in that: The lens satisfies the following conditional formula: -5<(R4+R5) / (R4-R5)<-1 Wherein, R4 is the radius of curvature of the object side of the second lens, and R5 is the radius of curvature of the image side of the second lens.

6. The upright telephoto optical lens according to claim 1, characterized in that: The lens satisfies the following conditional formula: V1 / V2>2.5 Wherein, V1 and V2 are the dispersion coefficients of the first lens and the second lens respectively.

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