Long-focus camera lens and imaging device

Abstract

The application provides a long-focus camera lens and an imaging device. The long-focus camera lens comprises, in sequence from an object side to an image side along an optical axis, a front fixed group with optical power, the front fixed group comprising at least one triple cemented lens; a stop; a focusing group with optical power; and a rear fixed group with optical power, the rear fixed group comprising at least one first double cemented lens. In a focusing process, the front fixed group, the stop and the rear fixed group remain fixed relative to an image plane, and the focusing group is configured to be movable along the optical axis between the front fixed group and the rear fixed group for focusing. The application constrains the focusing action to a single movable focusing group by correcting and compensating the optical path with the composite cemented lenses in the front and rear fixed groups, effectively suppresses the fluctuation of aberration and the breathing effect in the dynamic focusing process, and simplifies the focusing mechanical structure of the long-focus large-aperture lens.

Description

Technical Field

[0001] This invention relates to the field of optical imaging technology, and more specifically to a telephoto camera lens and imaging device. Background Technology

[0002] With the continuous development of optoelectronic technology, camera lenses have been widely used in various imaging devices. Conventional camera lenses usually adopt a relatively short focal length design, which makes it impossible to achieve an ideal zoom-in and magnification effect on distant objects when shooting at long distances, and it is difficult to clearly present distant details.

[0003] To meet the demands of long-distance photography, the industry has generally attempted to extend the system's focal length and increase the aperture. However, with the increase in focal length, optical aberrations and chromatic aberrations are significantly amplified. To suppress aberration degradation during focusing, most existing large-aperture telephoto lenses are forced to adopt complex multi-group coordinated movement focusing (i.e., floating focus) structures. This multi-group coordinated focusing design not only increases the system's size, weight, and mechanical assembly complexity but also results in low space utilization within the optical system, making it difficult to achieve a compact and lightweight structure. Summary of the Invention

[0004] In view of the aforementioned problems, this application is made to provide a telephoto lens and imaging device that overcomes or at least partially solves the aforementioned problems, comprising: A telephoto camera lens, comprising, along the optical axis from the object side to the image side, the following components: A front group fixation assembly with optical power, the front group fixation assembly comprising at least one cemented triode lens; Aperture; A focusing group with optical power; A rear group fixation assembly with optical power, the rear group fixation assembly including at least one first cemented doublet lens; During focusing, the front fixed group, the aperture stop, and the rear fixed group remain fixed relative to the image plane, and the focusing group is configured to move along the optical axis between the front fixed group and the rear fixed group for focusing.

[0005] According to one embodiment of the present invention, the focal length f01 of the front fixed group satisfies 180mm < |f01| < 260mm; The focal length f02 of the focusing group satisfies 90mm < |f02| < 150mm; The focal length f03 of the rear fixed group satisfies |f03|>150mm.

[0006] According to one embodiment of the present invention, the front group fixing assembly comprises, sequentially from the object side to the image side along the optical axis: A first lens with positive optical power; A second lens with positive optical power; A second cemented doublet lens having positive or negative optical power, wherein the second cemented doublet lens is formed by cementing a third lens and a fourth lens together; The three-layer cemented lens has a positive or negative optical power and is cemented together by a fifth lens, a sixth lens, and a seventh lens.

[0007] According to one embodiment of the present invention, the focal length f1 of the first lens satisfies 100mm < f1 < 200mm; The focal length f2 of the second lens satisfies f2 > 200mm; The combined focal length f3-4 of the second cemented doublet lens satisfies -260mm < f3-4 < 200mm; The combined focal length f5-7 of the three-cemented lens satisfies |f5-7|>150mm.

[0008] According to one embodiment of the present invention, the focusing group comprises, along the optical axis from the object side to the image side, the following components in sequence: An eighth lens with positive optical power; A ninth lens with negative optical power; A tenth lens with negative optical power; A third cemented doublet lens having positive or negative optical power, wherein the third cemented doublet lens is formed by cementing together an eleventh lens and a twelfth lens; The thirteenth lens with positive optical power.

[0009] According to one embodiment of the present invention, the focal length f8 of the eighth lens satisfies 65mm < f8 < 100mm; The focal length f9 of the ninth lens satisfies -180mm < f9 < -90mm; The focal length f10 of the tenth lens satisfies -160mm < f10 < -90mm; The combined focal length f11-12 of the third cemented doublet lens satisfies |f11-12|>260mm; The focal length f13 of the thirteenth lens satisfies 60mm < f13 < 100mm.

[0010] According to one embodiment of the present invention, the first cemented doublet lens has positive or negative optical power and is cemented together by a fourteenth lens and a fifteenth lens; The combined focal length f14-15 of the first cemented doublet lens satisfies |f14-15|>160mm.

[0011] According to one embodiment of the present invention, the total optical axis length of the telephoto lens from the lens surface closest to the object side to the image plane is not greater than 162mm, the maximum aperture is not greater than 85mm, and the back focal length is not less than 28mm.

[0012] According to one embodiment of the present invention, the telephoto camera lens has a system equivalent focal length greater than 120mm and an aperture F-number of 1.5 to 2.0; When the focusing group moves to continuously change the object distance within the range of infinity to 1 meter, the field of view of the telephoto lens does not change by more than 5%.

[0013] An imaging device, comprising: Image sensor chip; The telephoto lens described above; The telephoto lens is disposed on the object side of the image sensor chip and is used to converge light from the object side and image it onto the image sensor chip.

[0014] This application has the following advantages: In the embodiments of this application, an optical structure is employed that combines a fixed front group, a single-moving focusing group, and a fixed rear group. Triple-thickness lenses and double-thickness lenses are respectively configured in the fixed front and rear groups. This significantly simplifies the focusing mechanism, reduces system size and assembly complexity, and effectively compensates for chromatic aberration and aberration fluctuations caused by single-structure moving focus. With an equivalent focal length greater than 120mm and an aperture of F-numbers from 1.5 to 2.0, this telephoto camera lens enhances the ability to magnify distant objects and resolve microscopic details, while also ensuring high color reproduction and resolution sharpness in low-light environments. It achieves a balance between ultra-long focal length, large aperture, and compact structural arrangement. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this application, the drawings used in the description of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the structure of a telephoto camera lens provided in one embodiment of this application; Figure 2 This is a schematic diagram of the ray tracing and optical path structure of a telephoto camera lens provided in an embodiment of this application; Figure 3 This is a graph of the polychromatic light diffraction optical modulation transfer function (MTF) of a telephoto lens provided in an embodiment of this application; Figure 4 This is a field curvature and distortion diagram of a telephoto camera lens provided in an embodiment of this application.

[0017] Figure label: 1. Fixed group in the front group; 11. First lens; 12. Second lens; 13. Third lens; 14. Fourth lens; 15. Fifth lens; 16. Sixth lens; 17. Seventh lens; ST, aperture; 2. Focusing assembly; 21. Eighth lens; 22. Ninth lens; 23. Tenth lens; 24. Eleventh lens; 25. Twelfth lens; 26. Thirteenth lens; 3. Fixed group in the back row; 31. Fourteenth lens; 32. Fifteenth lens. Detailed Implementation

[0018] To make the objectives, features, and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0019] The inventors, through analysis of existing technologies, discovered that conventional photographic lenses typically employ short focal lengths, with mainstream lenses generally having focal lengths less than 100mm and corresponding apertures around f / 2.5. These conventional lenses, when shooting at long distances, cannot achieve the desired zoom-in effect for distant objects, making it difficult to clearly present microscopic details. To meet the needs of shooting at long distances and in low-light environments, the industry has attempted to extend the system's focal length and increase the aperture. However, with the increase in focal length and aperture, optical aberrations and chromatic aberration are significantly amplified. To suppress aberration degradation during close-range focusing, large-aperture telephoto lenses are often forced to adopt complex multi-group cooperative focusing (i.e., floating focus) structures. This design not only increases the system's size, weight, and assembly difficulty but also often limits the closest focusing distance. Furthermore, telephoto lenses are prone to significant "breathing effects" when switching focus at different object distances, causing drastic changes in the field of view and framing, severely affecting the stability and consistency of images during continuous shooting.

[0020] Reference Figures 1 to 2This illustration shows a telephoto camera lens according to an embodiment of the present application, which includes, sequentially from the object side to the image side along the optical axis, a front fixed group 1 with optical power, an aperture ST, a focusing group 2 with optical power, and a rear fixed group 3 with optical power. The optical centers of each lens in the front fixed group 1, the aperture ST, the focusing group 2, and the rear fixed group 3 are all coaxially arranged on the main optical axis.

[0021] Specifically, the front group fixing assembly 1 includes at least one cemented triplet lens. The cemented triplet lens is formed by three single lenses being tightly bonded together along the optical axis. The bonding surfaces of adjacent lenses have matching radii of curvature, which is used to perform initial convergence and chromatic aberration compensation for light rays incident on the object side.

[0022] An aperture stop ST is positioned in the optical path between the front fixed group 1 and the focusing group 2 to limit the cross-sectional area of ​​the light beam through the aperture and adjust the amount of light entering the subsequent lens group. The focusing group 2 is positioned on the image side of the aperture stop ST and is located between the front fixed group 1 and the rear fixed group 3.

[0023] The rear fixed group 3 includes at least one first cemented doublet lens, which is formed by bonding and fixing two single lenses together along the optical axis. It is used to receive transmitted light from the focusing group 2 and further converge and guide it onto the image plane for imaging.

[0024] During focusing, the front fixed group 1, the aperture ST and the rear fixed group 3 remain fixed relative to the image plane, and the focusing group 2 is configured to move along the optical axis between the front fixed group 1 and the rear fixed group 3 for focusing.

[0025] In other words, during the focusing adjustment process of the telephoto lens, the front fixed group 1, the aperture ST, and the rear fixed group 3 are all statically fixed in physical position relative to the image plane through the external lens barrel or internal support components. When the object distance of the scene to be photographed changes, the user can drive the focusing group 2 through the drive mechanism, so that the focusing group 2 can linearly reciprocate between the front fixed group 1 and the rear fixed group 3 along the principal optical axis. After the light enters the lens from the object side, it passes through the front fixed group 1 and the aperture ST in sequence. With the help of the axial displacement of the focusing group 2 along the optical axis, the air gap between the focusing group 2 and the adjacent fixed groups in front and behind is changed, thereby continuously adjusting the convergence state of the entire lens. Finally, the rear fixed group 3 focuses the light beam carrying scene information onto the image plane.

[0026] In the embodiments of this application, by adopting an optical structure in which the front fixed group 1, the single-moving focusing group 2, and the rear fixed group 3 work together, and by configuring a cemented triplet lens and a cemented doublet lens in the front fixed group 1 and the rear fixed group 3 respectively, the focusing mechanical structure is greatly simplified, the system size and assembly complexity are reduced, and the chromatic aberration and aberration fluctuations caused by the single-structure moving focus are effectively compensated, thus ensuring the imaging resolution and image consistency of the lens at different object distances.

[0027] In one embodiment of the present invention, the focal length f01 of the front fixed group 1 satisfies 180mm < |f01| < 260mm, and this focal length range defines the initial refraction amplitude of the front fixed group 1. The beam is guided smoothly into the rear optical path to prevent excessive light deflection from causing a sudden increase in aberrations.

[0028] The focal length f02 of focusing group 2 satisfies 90mm < |f02| < 150mm. This focal length range gives focusing group 2 moderate refractive power. When it translates along the optical axis to adjust the light, it prevents the absolute value of the focal length from being too large, which would result in an excessively long mechanical focusing travel, and also prevents the absolute value from being too small, which would cause aberrations to be too sensitive to displacement, thereby reducing the difficulty of coordinating and controlling the external transmission structure.

[0029] The focal length f03 of the rear fixed group 3 satisfies |f03|>150mm. This focal length range allows the rear fixed group 3, which is at the end of the optical path, to have relatively weak optical power. It only performs a small amount of optical path correction on the transmitted beam, guiding the outgoing light to be projected smoothly and focused on the image plane.

[0030] By setting the focal length parameters described above, a reasonable system optical power gradient is formed. This ensures that the displacement of a single focus group 2 is sufficient to cover the entire focusing stroke, thus limiting aberrations and focus drift caused by dynamic focusing.

[0031] In one embodiment of the present invention, the front fixed group 1 includes, along the optical axis from the object side to the image side, a first lens 11 having positive optical power, a second lens 12 having positive optical power, a second cemented doublet having positive or negative optical power, and the third cemented triplet having positive or negative optical power. The second cemented doublet is formed by cementing a third lens 13 and a fourth lens 14 together. The third cemented triplet is formed by cementing a fifth lens 15, a sixth lens 16, and a seventh lens 17 together.

[0032] In this system, the first lens 11 and the second lens 12 initially converge the light beam entering from the object side. A first cemented interface is formed between the third lens 13 and the fourth lens 14. When the transmitted light beam passes through this first cemented interface, the difference in Abbe number between the different lens materials limits axial chromatic aberration. The fifth lens 15, the sixth lens 16, and the seventh lens 17 are cemented sequentially to form the second and third cemented interfaces, respectively. The transmitted light beam experiences compensatory deflection when passing through the second and third cemented interfaces, thus performing secondary spectral correction at the edge of the large aperture.

[0033] In this embodiment, the front fixed group 1 with the above-described structure is used to converge the initial chromatic aberration and spherical aberration of the main beam in advance, and to prevent the optical distortion from being transmitted and amplified to the rear dynamic focusing group 2.

[0034] In one embodiment of the present invention, the focal length f1 of the first lens 11 satisfies 100mm < f1 < 200mm, which is used to transition the initial curvature of the large-aperture incident beam and prevent the edge light rays from focusing and scattering due to excessive curvature of a single lens.

[0035] The focal length f2 of the second lens 12 satisfies f2 > 200mm. The second lens 12 with this focal length exhibits a weak positive power characteristic, so that the diverging or converging beam emitted from the first lens 11 is only slightly deflected when passing through the second lens 12, thereby effectively sharing the spherical aberration accumulation of the entire front fixed group 1.

[0036] The combined focal length f3-4 of the second cemented doublet lens satisfies -260mm < f3-4 < 200mm. This combined focal length, by matching the refractive indices and Abbe numbers of the third lens 13 and the fourth lens 14, can compensate for axial chromatic aberration in a specific wavelength band while introducing positive or negative refractive power.

[0037] The combined focal length of the triplet lens, f5-7, satisfies |f5-7|>150mm. This combined focal length-limited triplet lens, while maintaining a relatively flat overall optical power, effectively suppresses advanced coma and second-order spectral distortion by continuously refractively correcting incident light rays at the edges of a large field of view through its internal optical cementation interface.

[0038] Through the interaction of the above focal length parameters and lens combination, a stable and continuous refractive force gradient is formed inside the front fixed group 1, which allows the light beam to be finely shaped before entering the rear focusing group 2, thereby reducing the tendency of aberration to spread backward in the dynamic range at the source.

[0039] In one embodiment of the present invention, the focusing group 2 includes, along the optical axis from the object side to the image side, an eighth lens 21 having positive optical power, a ninth lens 22 having negative optical power, a tenth lens 23 having negative optical power, a third cemented doublet having positive or negative optical power, and a thirteenth lens 26 having positive optical power.

[0040] In practical applications, the eighth lens 21 to the thirteenth lens 26 are relatively fixed inside the same focusing lens barrel. When the focusing group 2 is translated as a whole along the optical axis, the eighth lens 21 initially pre-converges the incident beam, and then the beam is diverged and extended by the negative optical power of the ninth lens 22 and the tenth lens 23 to smooth out the surge of higher aberrations during dynamic displacement.

[0041] The third cemented doublet is formed by cementing together an eleventh lens 24 and a twelfth lens 25. The image-side surface of the eleventh lens 24 and the object-side surface of the twelfth lens 25 have matching curvatures, and their interface is uniformly filled with optical adhesive for bonding. This third cemented doublet is used to further correct local wavelength dispersion of the transmitted beam.

[0042] By adopting the above-mentioned focus group 2 structure, while ensuring the focusing refraction capability required by the single focus group 2, a dynamic self-compensation effect for chromatic aberration and spherical aberration is formed inside the focus group 2, which suppresses the drastic fluctuation of the local distortion coefficient of the single focus group 2 during long-stroke sliding adjustment.

[0043] In one embodiment of the present invention, the focal length f8 of the eighth lens 21 satisfies 65mm < f8 < 100mm, so that the incident wide beam of light produces controlled initial convergence and prevents the edge light from overflowing when the focusing lens barrel is dynamically translated over a long distance.

[0044] The focal length f9 of the ninth lens 22 satisfies -180mm < f9 < -90mm, and its negative optical power guides the beam to extend and deflect. For example, the surface of the ninth lens 22 can be treated with an anti-reflection coating process to suppress internal reflection.

[0045] The focal length f10 of the tenth lens 23 satisfies -160mm < f10 < -90mm. It is translated in conjunction with the ninth lens 22 to distribute the beam divergence pressure and prevent lens forming and assembly sensitization caused by excessively steep local curvature.

[0046] The combined focal length f11-12 of the third cemented doublet satisfies |f11-12|>260mm. This third cemented doublet with low light power dominates the dynamic neutralization of adjacent dispersive spectral lines of different wavelengths when it slides to focus following the focusing lens barrel.

[0047] The focal length f13 of the thirteenth lens 26 satisfies 60mm < f13 < 100mm. This thirteenth lens 26 refocuses the internal astigmatism, ensuring that when the focusing group 2 is moved to the image-side extreme position, the outgoing light rays can be projected smoothly.

[0048] The stepped setting of the internal parameters of the focusing group 2 creates an optical path with alternating positive and negative refractive forces within the focusing displacement range. This limits the deflection amplitude of light during zooming and stabilizes the chromatic aberration and spherical aberration fluctuations associated with axial reciprocating sliding.

[0049] In one embodiment of the present invention, the first cemented doublet lens has a positive or negative optical power and is cemented together by a fourteenth lens 31 and a fifteenth lens 32. The combined focal length f14-15 of the first cemented doublet lens satisfies |f14-15|>160mm. This combined focal length allows residual dispersion to be compensated by material differences when transmitted light passes through the cemented interface of the first cemented doublet lens, and smoothly constrains the deflection amplitude of the outgoing beam, achieving aberration convergence at the optical path exit end and reducing the sensitivity of the assembly to axial assembly tolerances.

[0050] In one embodiment of the present invention, the total optical axis length of the telephoto lens from the lens surface closest to the object side to the image plane is no greater than 162 mm, the maximum aperture is no greater than 85 mm, and the back focal length is no less than 28 mm. This parameter configuration constrains the axial and radial volume of the telephoto lens, limiting the size of the lens barrel while maintaining the large aperture light transmission characteristics, and meeting the assembly requirements of auxiliary optical accessories at the image side end.

[0051] In one embodiment of the invention, the telephoto lens has a system equivalent focal length greater than 120mm and an aperture of F-number between 1.5 and 2.0. Preferably, the telephoto lens has a system equivalent focal length of 146mm and an aperture of F-number 1.7. At this system equivalent focal length, distant objects can be significantly brought closer to the camera, allowing for the resolution of two objects 3 meters apart and 1mm apart. The large aperture of F-number 1.7 corresponds to a large light intake, resulting in superior color reproduction and resolution sharpness in low-light conditions.

[0052] When the focusing group 2 moves to continuously change the object distance within the range of infinity to 1 meter, the field of view of the telephoto lens does not change by more than 5%.

[0053] When the target object gradually moves from infinity to a physical distance of 1 meter, the focusing group 2 simultaneously completes axial sliding. At this time, relying on the constraint of the deflection angle of the principal light by the front fixed group 1 and the rear fixed group 3, the projection range of the emitted light on the image plane remains relatively constant, thereby limiting the dynamic fluctuation of the field of view to within the 5% threshold, ensuring that the framing range will not change when focusing and shooting within a certain range of object distance.

[0054] Thus, while the system possesses the ability to zoom in at long focal lengths and has a large light throughput, it suppresses the image scaling distortion caused by long-stroke physical displacement and maintains the consistency of the target framing range when switching between different object distances.

[0055] In one specific embodiment of this application, combined with Figure 2 The schematic diagram of the optical structure shows that the telephoto camera lens has a system equivalent focal length f of 146mm, an aperture f-number (FNO) of 1.7, and an image plane diameter of 60mm. The lens has a front group fixed assembly 1, an aperture stop ST, a focusing group 2, and a rear group fixed assembly 3 arranged sequentially along the optical axis from the object side to the image side. A chip protective glass, made of H-K9 glass, is also provided at the end of the optical path near the image plane.

[0056] Specifically, in this embodiment, the lens surfaces of each lens along the optical axis from the object side to the image side are defined as S1 to S31, and the surface shape, radius of curvature, thickness interval, and lens material parameters (refractive index, Abbe number) of each optical surface are shown in Table 1 below: Table 1

[0057] Reference Figure 3 The diagram shows the diffraction optical modulation transfer function (MTF) curves for polychromatic light in the wavelength range of 0.4050 to 0.6850 μm, according to this embodiment. Figure 3 It can be seen that when the spatial frequency reaches 30 line pairs / mm, the MTF curves of each field of view from the center field of view (TS 0.00 degrees) to the maximum field of view at the edge (TS 11.50 degrees) remain smooth without significant abrupt attenuation, and the values ​​are basically maintained at 0.5 or above. This indicates that the system effectively suppresses spherical aberration and chromatic aberration under the conditions of a 146mm focal length and a large aperture of f / 1.7, and has good resolution and image contrast, meeting the resolution requirements of sensors with 8K and above pixels.

[0058] Reference Figure 4 The field curvature and distortion diagram of this embodiment are shown. Figure 4 As shown, at a maximum field of view of 11.500 degrees, the sagittal field curvature of the system was controlled at 0.1030 mm, and the meridional field curvature was controlled at 0.0527 mm. Simultaneously, its maximum F-Tan (Theta) distortion was strictly controlled within 1%. These test results demonstrate that the parameter matching between the single lens and the multiple cemented lenses within the system is reasonable, effectively suppressing astigmatism and image distortion at the edges of the field of view, ensuring image flatness across the entire field of view.

[0059] This invention also provides an imaging device, including an image sensor chip and a telephoto lens as described in the above embodiments. The telephoto lens is disposed on the object side of the image sensor chip and is used to converge light from the object side and image it onto the image sensor chip.

[0060] This imaging device, through the cooperation of the telephoto lens and the image sensor chip, enables the transmission and convergence of a light beam entering from the object side at an equivalent focal length of 146mm and an aperture of f / 1.7. While maintaining the system's light transmission, it corrects for aberrations and chromatic aberrations in the transmitted beam and projects the corrected beam onto the photosensitive surface of the image sensor chip. This structure allows the imaging device to meet the imaging requirements of 8K and above pixels and supports the output of clear images in long-distance and low-light shooting environments.

[0061] Although preferred embodiments of the present application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the embodiments of the present application.

[0062] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes said element.

[0063] The foregoing has provided a detailed description of a telephoto camera lens and imaging device provided in this application. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A telephoto camera lens, characterized in that, Along the optical axis from the object side to the image side, the following are included in sequence: A front group fixation assembly with optical power, the front group fixation assembly comprising at least one cemented triode lens; Aperture; A focusing group with optical power; A rear group fixation assembly with optical power, the rear group fixation assembly including at least one first cemented doublet lens; During focusing, the front fixed group, the aperture stop, and the rear fixed group remain fixed relative to the image plane, and the focusing group is configured to move along the optical axis between the front fixed group and the rear fixed group for focusing.

2. The telephoto camera lens according to claim 1, characterized in that, The focal length f01 of the front fixed group satisfies 180mm < |f01| < 260mm; The focal length f02 of the focusing group satisfies 90mm < |f02| < 150mm; The focal length f03 of the rear fixed group satisfies |f03|>150mm.

3. The telephoto camera lens according to claim 1, characterized in that, The front group of fixed components along the optical axis from the object side to the image side includes, in sequence: A first lens with positive optical power; A second lens with positive optical power; A second cemented doublet lens having positive or negative optical power, wherein the second cemented doublet lens is formed by cementing a third lens and a fourth lens together; The three-layer cemented lens has a positive or negative optical power and is cemented together by a fifth lens, a sixth lens, and a seventh lens.

4. The telephoto lens according to claim 3, characterized in that, The focal length f1 of the first lens satisfies 100mm < f1 < 200mm; The focal length f2 of the second lens satisfies f2 > 200mm; The combined focal length f3-4 of the second cemented doublet lens satisfies -260mm < f3-4 < 200mm; The combined focal length f5-7 of the three-cemented lens satisfies |f5-7|>150mm.

5. The telephoto lens according to claim 1, characterized in that, The focusing group, along the optical axis from the object side to the image side, comprises: An eighth lens with positive optical power; A ninth lens with negative optical power; A tenth lens with negative optical power; A third cemented doublet lens having positive or negative optical power, wherein the third cemented doublet lens is formed by cementing together an eleventh lens and a twelfth lens; The thirteenth lens with positive optical power.

6. The telephoto lens according to claim 5, characterized in that, The focal length f8 of the eighth lens satisfies 65mm < f8 < 100mm; The focal length f9 of the ninth lens satisfies -180mm < f9 < -90mm; The focal length f10 of the tenth lens satisfies -160mm < f10 < -90mm; The combined focal length f11-12 of the third cemented doublet lens satisfies |f11-12|>260mm; The focal length f13 of the thirteenth lens satisfies 60mm < f13 < 100mm.

7. The telephoto lens according to claim 1, characterized in that, The first cemented doublet lens has positive or negative optical power and is cemented together by a fourteenth lens and a fifteenth lens; The combined focal length f14-15 of the first cemented doublet lens satisfies |f14-15|>160mm.

8. The telephoto lens according to claim 1, characterized in that, The total length of the optical axis of the telephoto camera lens from the lens surface closest to the object to the image plane is no greater than 162mm, the maximum aperture is no greater than 85mm, and the back focal length is no less than 28mm.

9. The telephoto lens according to claim 1, characterized in that, The telephoto camera lens has a system equivalent focal length greater than 120mm and an aperture of F-number from 1.5 to 2.

0. When the focusing group moves to continuously change the object distance within the range of infinity to 1 meter, the field of view of the telephoto lens does not change by more than 5%.

10. An imaging device, characterized in that, include: Image sensor chip; The telephoto lens as described in any one of claims 1 to 9; The telephoto lens is disposed on the object side of the image sensor chip and is used to converge light from the object side and image it onto the image sensor chip.

Images