Five-piece type ultra-small upright telephoto lens

Abstract

The invention provides a five-piece type ultra-small upright telephoto lens. The five-piece type ultra-small upright telephoto lens comprises a first lens, an aperture diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and an optical filter which are sequentially arranged from an object side to an image side along an optical axis, the first lens is a positive lens, the surface facing the image is a concave surface, and the surface facing the object is a convex surface; the second lens is a negative lens, the surface facing the image is a concave surface, and the surface facing the object is a convex surface; the third lens is a negative lens, the surface facing the image is a concave surface, and the surface facing the object is a convex surface; the fourth lens is a positive lens, the surface facing the image is a convex surface, and the surface facing the object is a concave surface; the fifth lens is a negative lens, the surface facing the image is a convex surface, and the surface facing the object is a concave surface. The five-piece type design of the lens effectively corrects aberration and chromatic aberration, provides clear and sharp images, accurately captures details of distant objects, adapts to small electronic equipment such as smart phones, does not occupy too much space, and improves the long-focus shooting capability of the equipment; subminiaturization of the lens is realized, and more internal space is saved for electronic equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical equipment, and more particularly to a five-piece ultra-small erect long-focus lens. BACKGROUND

[0002] With the rapid development of electronic devices, users' requirements for the camera function of the devices are continuously increasing. Long-focus lenses are highly concerned in electronic devices due to their unique advantages, such as shooting distant objects, achieving close-up shooting, and creating a shallow depth-of-field effect. However, there are many problems in the existing long-focus lens technology.

[0003] Traditional long-focus lenses are bulky, especially periscopic long-focus lenses, which can provide good long-focus performance but require a large module space, which is contrary to the development trend of electronic devices towards thinness and high integration. For example, in a small-screen mobile phone, the size of the body is limited, and it is difficult to simultaneously accommodate a large battery, a high-performance heat dissipation system, and a large long-focus lens module, resulting in a difficult balance between function and portability of the device. In addition, a large-size long-focus lens also affects the appearance of the device and reduces the user experience.

[0004] Although erect long-focus lenses are relatively low in cost, previous designs have limitations in miniaturization and cannot meet the needs of electronic devices for space utilization and portability. In the existing technology, the size problem of long-focus lenses has become an important bottleneck restricting the performance improvement and appearance design of electronic devices. On the one hand, a large-size lens module occupies too much space, limiting the layout of other important components, such as the difficulty of increasing battery capacity and optimizing the heat dissipation system; on the other hand, the unattractive appearance design also affects users' acceptance of the product.

[0005] Therefore, how to realize the ultra-small size of the long-focus lens while maintaining its performance to meet the development needs of electronic devices has become a technical problem to be solved in the field. SUMMARY

[0006] The present application proposes a five-piece ultra-small erect long-focus lens to solve the problem of large size of existing long-focus lenses and the inconvenience of installing them in small electronic devices, achieving the purpose of realizing the ultra-small size of the long-focus lens while maintaining its performance, thereby breaking through the important bottleneck of the size problem of long-focus lenses restricting the performance improvement and appearance design of electronic devices.

[0007] The technical solution provided by the present application is as follows: A five-piece ultra-small erect long-focus lens includes, in order from the object side to the image side along the optical axis, a first lens, an aperture stop, a second lens, a third lens, a fourth lens, a fifth lens, and a filter; The first lens is a positive lens, with a concave surface facing the image plane and a convex surface facing the object plane. The second lens is a negative lens, the surface towards the image plane is a concave surface, and the surface towards the object plane is a convex surface; The third lens is a negative lens, the surface towards the image plane is a concave surface, and the surface towards the object plane is a convex surface; The fourth lens is a positive lens, the surface towards the image plane is a convex surface, and the surface towards the object plane is a concave surface; The fifth lens is a negative lens, the surface towards the image plane is a convex surface, and the surface towards the object plane is a concave surface.

[0008] Based on the above technical solutions, the application can also be improved as follows.

[0009] Optionally, the focal length of the first lens is f1, the focal length of the lens is f, and the following conditions are met: 0.5 ≤ |f1 / f| ≤ 0.6.

[0010] The combined focal length of the first lens, the second lens and the third lens is f123, the focal length of the lens is f, and the following conditions are met: 0.9 ≤ |f123 / f| ≤ 1.1.

[0011] The combined focal length of the fourth lens and the fifth lens is f45, the focal length of the lens is f, and the following conditions are met: 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.5.

[0012] The Abbe number vd of the first lens, the third lens and the fifth lens all meet the following conditions: 50 ≤ vd ≤ 60.

[0013] The total optical length TTL of the optical system of the five-piece ultra-small upright long-focus lens meets the following conditions: 6.6mm ≤ vd ≤6.7mm.

[0014] The five-piece ultra-small upright long-focus lens provided by the application has the following beneficial effects by collocating the aperture stop and the five lenses according to specific surface shapes and reasonable focal power distribution: The five-piece ultra-small upright long-focus lens effectively corrects aberration and chromatic aberration through five-piece design, provides clear and sharp images, accurately captures details of distant objects, is suitable for small electronic devices such as smartphones, does not occupy too much space, and improves the long-focus shooting capability of the device.

[0015] The lens aims to keep good long-focus performance, realize the ultra-miniaturization of the lens by innovative optical design and structural optimization, thereby saving more internal space of the electronic device for accommodating other important components such as a larger capacity battery, a more efficient heat dissipation system, and the like, improving the overall performance and user experience of the electronic device. At the same time, the ultra-miniature upright long-focus lens also helps the electronic device to realize a lighter, more beautiful appearance design, meeting the user's demand for portability and aesthetics.

[0016] In summary, compared with the existing complex periscope long-focus lens, the manufacturing and material costs are low, the manufacturer's procurement and product sales price are reduced, and the popularization rate is improved; it can be used in consumer electronics, security monitoring, industrial detection and other fields to meet the imaging needs of different scenes. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 The structure schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 1 of the present application is shown in the figure. Figure 2 The MFT performance schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 1 of the present application is shown in the figure. Figure 3 The FFT modulation transfer function data schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 1 of the present application under defocus variation at a specified frequency is shown in the figure. Figure 4 The distortion and field curvature schematic diagram of the light rays at any pupil of the five-piece ultra-miniature upright long-focus lens provided for embodiment 1 of the present application is shown in the figure. Figure 5 The Ray fan diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 1 of the present application is shown in the figure. Figure 6 The relative illumination schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 1 of the present application is shown in the figure. Figure 7 The structure schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 2 of the present application is shown in the figure. Figure 8 The MFT performance schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 2 of the present application is shown in the figure. Figure 9 The FFT modulation transfer function data schematic diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 2 of the present application under defocus variation at a specified frequency is shown in the figure. Figure 10 The distortion and field curvature schematic diagram of the light rays at any pupil of the five-piece ultra-miniature upright long-focus lens provided for embodiment 2 of the present application is shown in the figure. Figure 11 The Ray fan diagram of the five-piece ultra-miniature upright long-focus lens provided for embodiment 2 of the present application is shown in the figure. Figure 12 The relative-illuminance diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 2 of the present application is shown in the figure; Figure 13 The structure diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 3 of the present application is shown in the figure; Figure 14 The MFT performance diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 3 of the present application is shown in the figure; Figure 15 The FFT modulation transfer function data diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 3 of the present application under defocus variation at a specified frequency is shown in the figure; Figure 16 The distortion and field curvature diagram of the light rays at any pupil of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 3 of the present application is shown in the figure; Figure 17 The Ray fan diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 3 of the present application is shown in the figure; Figure 18 The relative-illuminance diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 3 of the present application is shown in the figure; Figure 19 The structure diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 4 of the present application is shown in the figure; Figure 20 The MFT performance diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 4 of the present application is shown in the figure; Figure 21 The FFT modulation transfer function data diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 4 of the present application under defocus variation at a specified frequency is shown in the figure; Figure 22 The distortion and field curvature diagram of the light rays at any pupil of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 4 of the present application is shown in the figure; Figure 23 The Ray fan diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 4 of the present application is shown in the figure; Figure 24 The relative-illuminance diagram of the five-piece ultra-small right-angle long-focus lens provided in Embodiment 4 of the present application is shown in the figure; In the figures, the components represented by the respective reference numerals are listed as follows: STO, aperture stop, L1, first lens, L2, second lens, L3, third lens, L4, fourth lens, L5, fifth lens. DETAILED DESCRIPTION

[0018] In order to make the purposes, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0019] The related feature parameters in the present application are described as follows: TTL is the total optical length of the optical system of the lens (the distance from the center point of the first lens surface to the center point of the image surface on the central optical axis); f1 is the focal length of the first lens; f2 is the focal length of the second lens; f3 is the focal length of the third lens; f123 is the focal length of the combined lens of the first lens, the second lens and the third lens; F45 is the focal length of the combined lens of the fourth lens and the fifth lens; f is the focal length of the lens (focal length, which is a way of measuring the convergence or divergence of light in an optical system, refers to the distance from the optical center of the lens to the focus point of light convergence when parallel light is incident).

[0020] The present application provides a five-piece ultra-small upright long-focus lens, as shown in the figure, the perspective lens includes three lenses, from the object side to the image side along the optical axis, the element arrangement order is as follows: the first lens, the aperture stop, the second lens, the third lens, the fourth lens, the fifth lens and the filter; Figure 1 The first lens is a positive lens, the surface towards the image is concave, and the surface towards the object is convex; The second lens is a negative lens, the surface towards the image is concave, and the surface towards the object is convex; The third lens is a negative lens, the surface towards the image is concave, and the surface towards the object is convex; The fourth lens is a positive lens, the surface towards the image is convex, and the surface towards the object is concave; The fifth lens is a negative lens, the surface towards the image is convex, and the surface towards the object is concave.

[0021] The focal length of the first lens is f1, and the focal length of the lens is f, which satisfies the following conditions: 0.5 ≤ |f1 / f| ≤ 0.6.

[0022] The combined focal length of the first lens, the second lens and the third lens is f123, and the focal length of the lens is f, which satisfies the following conditions: 0.9 ≤ |f123 / f| ≤ 1.1.

[0023] ​The combined focal length of the fourth lens and the fifth lens is f45, and the focal length of the lens is f, and the following conditions are met: 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.5.

[0024] The Abbe number vd of the first lens, the third lens and the fifth lens all meet the following conditions: 50 ≤ vd ≤ 60.

[0025] The total optical length TTL of the optical system of the five-piece ultra-small upright telephoto lens meets the following conditions: 6.6mm ≤ TTL ≤6.7mm.

[0026] Embodiment 1 This embodiment provides a structure of a five-piece ultra-small upright telephoto lens as shown in the figure, and the lens data of the five-piece ultra-small upright telephoto lens in this embodiment is shown in the following table: Figure 1

[0027] The characteristic parameter values of the five-piece ultra-small upright telephoto lens in this embodiment are as follows:

[0028] The above characteristic parameters are within the following parameter ranges: 0.5 ≤ |f1 / f| ≤ 0.6; 0.9 ≤ |f123 / f| ≤ 1.1; 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.5.

[0029] It should be noted that the full name of the modulation transfer function MTF is Modulation Transfer Function. MTF comprehensively reflects the contrast and resolution characteristics of the lens, which is measured by an instrument and can completely exclude the influence of objective factors such as film and the influence of subjective factors of manual interpretation.

[0030] MTF is one of the best tools for quantifying the overall imaging performance of a system in terms of resolution and contrast. The higher the MTF value, the higher the resolution of the system, and the smaller the details that can be transmitted. MTF is a method of combining resolution and contrast into a single specification or rule. The MTF curve shows both resolution and contrast information, which allows it to evaluate lenses according to the needs of a particular application, and can be used to compare the performance of multiple lenses.

[0031] ​Figure 2 This is the MTF performance graph of the five-element ultra-compact upright telephoto lens of Example 1. The X and Y coordinates represent the following: the horizontal axis represents different density levels (0-90 lp / mm); the vertical axis represents the lens performance percentage (0 to 100). Higher MTF curves indicate higher MTF scores and better performance. Higher scores in the high-density (90 lp / mm) MTF curve indicate a lens with enhanced ability to observe small objects.

[0032] Meaning of solid and dashed lines: The solid line represents the MTF curve produced parallel to the diameter, known as the sagittal curve; the dashed line represents the MTF curve produced perpendicular to the diameter, known as the meridional curve. The closer the solid and dashed lines are, the closer the lens's MTF performance in the meridional and sagittal directions is, and the better the lens performance.

[0033] Different groups of solid / dashed lines represent fields of view at different image heights. An image height value of 0 represents the center of the lens. A larger image height value indicates that the field of view is farther from the center, and the MTF performance of each line is closer, indicating good consistency between the center and edges of the lens.

[0034] Figure 3 Schematic diagram of the FFT modulation transfer function data of the defocus variation of the five-element ultra-compact upright telephoto lens of Example 1 at a specified frequency. It can be seen that the more concentrated the curve is and the higher the peak value is, the better the imaging effect of the corresponding lens is.

[0035] Figure 4 Schematic diagram of the distortion and field curvature of light at any pupil in the five-element ultra-compact upright telephoto lens of Example 1. The distortion and field curvature of light at any pupil in any field of view at a wavelength defined by Wave are shown. The field curvature graph on the left shows how the distance from the image plane to the paraxial image plane varies with the field of view coordinates; the distortion graph on the right shows the difference between the actual and ideal image heights for each field of view. The closer to the center, the better the imaging effect.

[0036] Figure 5 This is the Ray fan diagram of the five-element ultra-compact upright telephoto lens of Example 1. The smaller the value, the better the imaging effect.

[0037] Figure 6 This is a relative illumination diagram of the five-element ultra-compact upright telephoto lens of Example 1. The higher the value, the better the relative illumination.

[0038] Example 2 This embodiment provides a five-element ultra-compact upright telephoto lens structure. Figure 7 As shown, the lens data of the five-element ultra-compact upright telephoto lens in this embodiment are shown in the following table:

[0039] The characteristic parameter values of the five-piece ultra-small erect long-focus lens in this embodiment are:

[0040] The above characteristic parameters are within the following parameter ranges: 0.5 ≤ |f1 / f| ≤ 0.6; 0.9 ≤ |f123 / f| ≤ 1.1; 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.5.

[0041] Figure 8 The MTF performance diagram of the five-piece ultra-small erect long-focus lens of Embodiment 2 is shown in FIG. 2, where the meanings of the X and Y coordinates are as follows: the horizontal coordinate is the different density 0-90 lp / mm; and the vertical coordinate is the percentage of the lens performance from 0 to 100. The higher the MTF curve, the higher the MTF score of the lens, and the better the performance. The higher the MTF curve score at high density (90 lp / mm), the stronger the ability of the lens to observe small objects.

[0042] The meanings of the solid line and the dashed line are as follows: the solid line represents the MTF curve generated in parallel to the diameter direction, which is called the sagittal curve; and the dashed line represents the MTF curve generated perpendicular to the diameter direction, which is called the meridional curve. The closer the solid line and the dashed line, the closer the MTF performance of the lens in the meridional and sagittal directions, and the better the performance of the lens.

[0043] Different solid / dashed line groups represent different field of view with different image heights. The image height value of 0 is the center of the lens, and the larger the image height value, the farther the field of view from the center, and the closer the MTF performance of each line, which represents the better consistency of the lens center and the edge.

[0044] Figure 9 The FFT modulation transfer function data diagram of the five-piece ultra-small erect long-focus lens of Embodiment 2 under the specified frequency and defocus change is shown in FIG. 4. It can be seen that the more concentrated the curve is, the higher the peak value is, and the better the imaging effect of the lens is.

[0045] Figure 10 The distortion and field curvature diagram of the light rays at any pupil of the five-piece ultra-small erect long-focus lens of Embodiment 2 is shown in FIG. 5. The distortion and field curvature of the light rays at any pupil of the lens are defined on the wavelength of Wave, where the left field curvature diagram shows the curve of the distance between the image plane and the paraxial image plane with the change of the field coordinate; and the right distortion diagram shows the difference between the real image height and the ideal image height of each field of view, and the closer to the center, the better the imaging effect is.

[0046] Figure 11Ray fan diagram of the five-piece ultra-compact erect long-focus lens of Example 2, the smaller the value, the better the imaging effect.

[0047] Figure 12 Relative illumination diagram of the five-piece ultra-compact erect long-focus lens of Example 2, the higher the value, the better the relative illumination.

[0048] Example 3 This example provides a structure of a five-piece ultra-compact erect long-focus lens as shown in the figure, and the lens data of the five-piece ultra-compact erect long-focus lens in this example is shown in the following table: Figure 13 The characteristic parameter values of the five-piece ultra-compact erect long-focus lens in this example are:

[0049] The above characteristic parameters are within the following parameter ranges:

[0050] 0.5 ≤ |f1 / f| ≤ 0.6; 0.9 ≤ |f123 / f| ≤ 1.1; 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.5.

[0051] MTF performance diagram of the five-piece ultra-compact erect long-focus lens of Example 3, wherein the meanings of X and Y coordinates are as follows: the horizontal coordinate is the different density 0-90 lp / mm; the vertical coordinate is from 0 to 100, which is the percentage of lens performance. The higher the MTF curve, the higher the lens MTF score, and the better the performance. The higher the MTF curve score at high density (90 lp / mm), the stronger the lens can observe small objects. Figure 14 Meaning of solid line and dashed line: solid line represents the MTF curve generated parallel to the diameter direction, called sagittal curve; dashed line represents the MTF curve generated perpendicular to the diameter direction, called meridional curve. The closer the solid line and the dashed line, the closer the MTF performance of the lens in the meridional and sagittal directions, and the better the lens performance.

[0052] Different solid / dashed line groups: represent different field of view with different image heights, the image height value of 0 is the center of the lens, the larger the image height value, the farther the field of view from the center, and the closer the MTF performance of each line, which represents the better consistency of the lens center and the edge.

[0053]

[0054] Figure 15 ​The FFT modulation transfer function data diagram of the five-piece ultra-small erecting long-focus lens of embodiment 3 at a specified frequency and defocus variation; it can be seen that the more concentrated the curve is, the higher the peak is, and the better the imaging effect of the lens is.

[0055] Figure 16 The distortion and field curvature of the light at any pupil of the five-piece ultra-small erecting long-focus lens of embodiment 3 are shown in the diagram. The distortion and field curvature of the light at any pupil at a wavelength defined by Wave and any field of view are shown, wherein the left field curvature diagram shows the curve of the distance from the image plane to the paraxial image plane with the change of the field of view coordinate; the right distortion diagram shows the difference between the real image height and the ideal image height of each field of view, and the closer to the center, the better the imaging effect is.

[0056] Figure 17 The Ray fan diagram of the five-piece ultra-small erecting long-focus lens of embodiment 3 is shown, and the smaller the value is, the better the imaging effect is.

[0057] Figure 18 The relative illumination diagram of the five-piece ultra-small erecting long-focus lens of embodiment 3 is shown, and the higher the value is, the better the relative illumination is.

[0058] Embodiment 4 The structure of the five-piece ultra-small erecting long-focus lens provided in this embodiment is shown in Figure 19 The lens data of the five-piece ultra-small erecting long-focus lens in this embodiment is shown in the following table:

[0059] The characteristic parameter values of the five-piece ultra-small erecting long-focus lens in this embodiment are:

[0060] The above characteristic parameters are within the following parameter ranges: 0.5 ≤ |f1 / f| ≤ 0.6; 0.9 ≤ |f123 / f| ≤ 1.1; 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.5.

[0061] Figure 20 The MTF performance diagram of the five-piece ultra-small erecting long-focus lens of embodiment 4 is shown, wherein the meanings of the X and Y coordinates are as follows: the horizontal coordinate is the different density 0-90 lp / mm; the vertical coordinate is the lens performance percentage from 0 to 100. The higher the MTF curve is, the higher the lens MTF score is, and the better the performance is. The higher the MTF curve score at high density (90 lp / mm) is, the stronger the ability of the lens to observe small objects is.

[0062] The meaning of solid line and dotted line: the solid line represents the MTF curve generated in parallel to the diameter direction, which is called tangential curve; the dotted line represents the MTF curve generated in perpendicular to the diameter direction, which is called meridional curve. The closer the solid line and dotted line, the closer the MTF performance of the meridional and tangential directions of the lens, and the better the performance of the lens.

[0063] Different solid / dotted line groups: represent different field of view with different image heights, the image height value of 0 is the center of the lens, the larger the image height value, the farther the field of view from the center, and the closer the MTF performance of each line, which represents the consistency of the center and the edge of the lens.

[0064] Figure 21 The FFT modulation transfer function data diagram of the five-piece ultra-small erect long-focus lens of embodiment 4 under the specified frequency and defocus change; it can be seen that the more concentrated the curve is, the higher the peak value is, and the better the imaging effect of the corresponding lens is.

[0065] Figure 22 The distortion and field curvature of the light at any pupil of the five-piece ultra-small erect long-focus lens of embodiment 4 are shown in the diagram. The distortion and field curvature of the light at any pupil of the lens at the wavelength defined by Wave in any field of view, wherein the left field curvature diagram shows the distance between the image surface and the paraxial image surface changes with the field coordinate curve; the right distortion diagram shows the difference between the real image height and the ideal image height, the closer to the center, the better the imaging effect is.

[0066] Figure 23 The Ray fan diagram of the five-piece ultra-small erect long-focus lens of embodiment 4, the smaller the value is, the better the imaging effect is.

[0067] Figure 24 The relative luminance diagram of the five-piece ultra-small erect long-focus lens of embodiment 4, the higher the value is, the better the relative luminance is.

[0068] In summary, the five-piece ultra-small erect long-focus lens provided by the embodiment of the present application effectively corrects aberration and chromatic aberration through five-piece design, provides clear and sharp images, accurately captures the details of distant objects, The lens is suitable for small electronic devices such as smart phones, does not occupy too much space, improves the long-focus shooting capability of the device, has low manufacturing and material costs compared with a complex periscope long-focus lens, reduces the procurement and product selling price of manufacturers, and improves the popularization rate. The lens can be used in consumer electronics, security monitoring, industrial detection and other fields to meet the imaging needs of different scenes. The front group focal length f123 / total focal length f satisfies 0.9≤|f123 / f|≤1.1, which is beneficial to lens correction distortion; the rear group focal length f45 / total focal length f satisfies 2.2≤|f45 / f|≤3.4, which is beneficial to lens performance improvement; the focal length of the first lens |f1 / f| is between 0.5 and 0.6, which is beneficial to realize long focal length; the Abbe number of the first lens, the third lens and the fifth lens satisfies: 50≤vd≤60, which is beneficial to lens correction chromatic aberration; the total optical length of the lens satisfies 6.6~6.7mm, which is beneficial to realize small size, realize miniaturization, improve production efficiency and excellent mass production.

[0069] Although preferred embodiments of the application have been described herein, changes and modifications can be suggested to one skilled in the art, and it is intended that the scope of the application be limited only by the scope of the appended claims.

[0070] Obviously, various modifications and changes can be made to the present application by those skilled in the art without departing from the spirit and scope of the application. Accordingly, it is intended that the present application embrace all such modifications and changes as fall within the scope of the appended claims and their equivalents.

Claims

1. A five-element ultra-compact upright telephoto lens, characterized in that: The optical system comprises a first lens, an aperture stop, a second lens, a third lens, a fourth lens, a fifth lens and a filter, which are arranged in sequence from the object side along the optical axis to the image side; The first lens is a positive lens, with a concave surface facing the image plane and a convex surface facing the object plane; The second lens is a negative lens, with a concave surface facing the image plane and a convex surface facing the object plane; The third lens is a negative lens, with a concave surface facing the image plane and a convex surface facing the object plane; The fourth lens is a positive lens, with a convex surface facing the image plane and a concave surface facing the object plane; The fifth lens is a negative lens, with a convex surface facing the image plane and a concave surface facing the object plane.

2. The five-element ultra-compact upright telephoto lens according to claim 1, wherein: The focal length of the first lens is f1, and the focal length of the lens is f, which satisfies the following conditions: 0.5 ≤ |f1 / f| ≤ 0.

6.

3. The five-element ultra-compact upright telephoto lens according to claim 1, wherein: The combined focal length of the first lens, the second lens, and the third lens is f123, and the focal length of the lens is f, satisfying the following conditions: 0.9 ≤ |f123 / f| ≤ 1.

1.

4. The five-element ultra-compact upright telephoto lens according to claim 3, wherein: The combined focal length of the fourth lens and the fifth lens is f45, and the focal length of the lens is f, which satisfies the following conditions: 2.2 ≤ |f45 / f| ≤ 3.4; 0.3 ≤ |f123 / f45| ≤ 0.

5.

5. The five-element ultra-compact upright telephoto lens according to claim 1, wherein: The Abbe numbers vd of the first lens, the third lens, and the fifth lens all satisfy the following conditions: 50 ≤ vd ≤ 60.

6. The five-element ultra-compact upright telephoto lens according to claim 1, wherein: The total optical length TTL of the lens optical system of the five-element ultra-compact upright telephoto lens meets the following conditions: 6.6mm ≤ TTL ≤6.7mm.

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