CN216210172U - Optical system, imaging device, and movable platform - Google Patents

Optical system, imaging device, and movable platform Download PDF

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Publication number
CN216210172U
CN216210172U CN202090000287.7U CN202090000287U CN216210172U CN 216210172 U CN216210172 U CN 216210172U CN 202090000287 U CN202090000287 U CN 202090000287U CN 216210172 U CN216210172 U CN 216210172U
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lens
optical system
focal length
center point
imaging
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佩尔·努德隆德
叶茂林
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SZ DJI Technology Co Ltd
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SZ DJI Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B15/00—Optical objectives with means for varying the magnification
    • G02B15/02—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective
    • G02B15/10—Optical objectives with means for varying the magnification by changing, adding, or subtracting a part of the objective, e.g. convertible objective by adding a part, e.g. close-up attachment

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Abstract

An optical system is disposed on an image side of an imaging lens of a photographing device for reducing a focal length of the imaging lens. Wherein the optical system (100) comprises, arranged in order from an object side to an image side: a first lens (101) having positive optical power, a second lens (102) having negative optical power, a third lens (103) having positive optical power, a fourth lens (104) having negative optical power, and a fifth lens (105) having positive optical power; the optical system (100) has positive optical power, and the optical system (100) satisfies the expression: m is more than or equal to 0.5 and less than or equal to 1, and T is more than or equal to 0.05tl/EfflNot more than 0.45, wherein M is the magnification of the optical system (100), TtlIs the distance from the center point of the object side lens surface of the first lens to the center point of the image side lens surface of the fifth lens, EfflIs the focal length of the optical system.

Description

Optical system, imaging device, and movable platform
Technical Field
The present application relates to the field of optical technologies, and in particular, to an optical system, a photographing device using the optical system, and a movable platform.
Background
In the photographic process, need to switch over the camera of different frames with same camera lens sometimes, need use the reducing focus mirror when switching, this reducing focus mirror is for being used for reducing the optical system of focus, but current reducing focus mirror all has and is difficult to realize the miniaturization to and can influence imaging lens's formation of image quality scheduling problem when reducing focus.
SUMMERY OF THE UTILITY MODEL
Based on this, this application embodiment provides an optical system, camera device and movable platform, and this optical system is used for reducing the focal length, is favorable to the miniaturization of product, can also guarantee imaging quality simultaneously.
In a first aspect, embodiments of the present application provide an optical system, disposed on an image side of an imaging lens of a photographing device, for reducing a focal length of the imaging lens, the optical system including, disposed in order from an object side to the image side:
a first lens having a positive refractive power;
a second lens having a negative focal power;
a third lens having a positive refractive power;
a fourth lens having a negative focal power;
a fifth lens having a positive refractive power;
the optical system has positive optical power, and the optical system satisfies the following expression:
m is more than or equal to 0.5 and less than or equal to 1, and T is more than or equal to 0.05tl/Effl≤0.45
Wherein M is the magnification of the optical system, TtlIs the distance from the center point of the object side lens surface of the first lens to the center point of the image side lens surface of the fifth lens, EfflIs the focal length of the optical system.
In a second aspect, an embodiment of the present application further provides a shooting device, where the shooting device includes an imaging lens and the optical system provided in any one of the embodiments of the present application, where the optical system is configured on an image side of the imaging lens, and is used to reduce a focal length of the imaging lens.
In a third aspect, the present application further provides a movable platform, where the movable platform includes a platform body and a shooting device, and the shooting device is carried on the platform body; the shooting device comprises an imaging lens and the optical system provided by any one of the embodiments of the application, wherein the optical system is arranged on the image side of the imaging lens and used for reducing the focal length of the imaging lens.
The optical system, the shooting device and the movable platform provided by the embodiment of the application, wherein the optical system is arranged on the image side of the imaging lens of the shooting device and used for reducing the focal length of the imaging lens of the shooting device, the shooting device can be arranged on the movable platform, the optical system utilizes the combination of five lenses and specific parameter setting, the purpose of smaller focal length can be realized, the product volume can be reduced, and meanwhile, the imaging quality of the imaging lens can be ensured not to be influenced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical system provided in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of another optical system provided in an embodiment of the present application;
fig. 3 is a schematic configuration diagram of an optical system provided in an embodiment of the present application;
fig. 4 is a schematic configuration diagram of an optical system provided in an embodiment of the present application;
FIG. 5 is a schematic diagram illustrating an effect of field curvature of an optical system according to an embodiment of the present disclosure;
FIG. 6 is a schematic diagram illustrating distortion effects of an optical system according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of a shooting device according to an embodiment of the present application;
fig. 8 is a schematic structural diagram of a movable platform according to an embodiment of the present disclosure.
Description of the main elements and symbols:
100. an optical system; 101. a first lens; 102. a second lens; 103. a third lens; 104. a fourth lens; 105. a fifth lens; 106. a filter lens; 107. protecting the lens;
200. a photographing device; 20. an imaging lens; 22. shooting an object; 220. shooting an image of an object; 211. A display screen; 212. shooting a key;
300. a movable platform; 30. a platform body.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some, but not all, embodiments of the present application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
It is also to be understood that the terminology used in the description of the present application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an optical system according to an embodiment of the present disclosure. The optical system is arranged at the image side of an imaging lens of the shooting device and is used for reducing the focal length of the imaging lens of the shooting device, and meanwhile miniaturization can be achieved and the imaging quality of shooting and the shooting device can be kept.
As shown in fig. 1, the optical system 100 includes a first lens 101, a second lens 102, a third lens 103, a fourth lens 104, and a fifth lens 105, which are arranged in this order from an object side to an image side.
The first lens 101 has positive power, the second lens 102 has negative power, the third lens 103 has positive power, the fourth lens 104 has negative power, and the fifth lens 105 has positive power. The optical system 100 composed of the five lenses has positive power as a whole, and the optical system 100 is a lens group for reducing the focal length, and can be called a focusing reduction lens.
The optical system 100 satisfies the following expression:
0.5≤M≤1(1)
in expression (1), M is a magnification of the optical system 100, and the magnification is a ratio of an imaging size of an object on a focal plane through a lens to an actual size of the object.
And, the optical system 100 satisfies the following expression:
0.05≤Ttl/Effl≤0.45(2)
in the expression (2), TtlIs the distance from the center point of the object side lens surface of the first lens element 101 to the center point of the image side lens surface of the fifth lens element 105, EfflIs the focal length of the optical system 100. Satisfying this condition, the volume of the optical system can be reduced, and miniaturization can be achieved.
Specifically, in the embodiment of the present application, it is also possible to define that the optical system 100 satisfies the expression 0.6. ltoreq. M.ltoreq.0.9.
In some embodiments, in order to filter out the interference light to improve the imaging quality, as shown in fig. 2, the optical system 100 includes a filter lens 106, and the filter lens 106 is disposed between the fifth lens 105 and an imaging surface Img of an imaging lens of the photographing device. In particular, the filter lens may be an infrared filter (IR) lens for filtering infrared light, but may also be filter lenses of other wavelengths.
In some embodiments, in order to avoid damaging the image sensor of the camera when mounted, the optical system 100 comprises a protective lens 107, as shown in fig. 2, the protective lens 107 being arranged between the filter lens 106 and the image sensor of the camera for protecting the photosensitive elements of said image sensor. The surface (photosensitive element) of the image sensor is an image forming surface Img.
In some embodiments, in order to achieve miniaturization of the product, the thickness of the filter lens 106 is 0.8 mm, and the thickness of the protective lens 107 is 1 mm, although other values are possible.
It should be noted that the optical system is mainly applied to a non-reflection camera. The non-reflection camera, namely the non-reflector camera, also called a semi-transparent camera, is mainly applied to ultra-high-speed continuous shooting, and can eliminate the disadvantages of vibration, delay, overlong viewfinder blacking time and the like caused by the vertical motion of the traditional single-reflection reflector during continuous shooting, thereby improving the shooting effect.
In an embodiment of the present application, the non-inverter machine may include one of a medium-format non-inverter machine and a full-format non-inverter machine. Wherein, for a film camera, a frame often refers to the area of the imaging range of the camera on film; for digital cameras, the frame is typically the size of the sensor area. The frames are arranged from small to large and can be classified into 1/3 inches, 1/2.3 inches, 1 inch, M4/3 frames, APS-C frames, full frames, middle frames, large frames and the like, and the middle frame sensor comprises different specifications of 44 × 33mm, 54 × 40mm and the like.
The optical system can be applied to a middle-frame non-reflection camera, in particular to a lens with a long flange focal length for switching a middle-frame camera (frame 54 x 40mm) so as to adapt to a short flange focal length middle-frame non-reflection camera (frame 44 x 33mm), and the lens after switching can be ensured to have better imaging quality.
It should be noted that the optical system is applied to a zoom-out ratio of 0.8 for a medium-sized non-reflection camera. Therefore, the imaging lens has high zoom ratio while realizing miniaturization and high imaging quality, and can effectively reduce the focal length of the imaging lens of the shooting device.
The optical system provided by the embodiment of the application utilizes the combination of five lenses and the setting of specific parameters, can effectively reduce the focal length of the imaging lens of the shooting device, can reduce the caliber of the lens, enables the structure of the optical system to be more compact, and further realizes miniaturization.
The optical system provided by the embodiment of the application can realize product miniaturization, can ensure that the field angle of the imaging lens is hardly changed when the optical system is arranged at the image side of the imaging lens, thereby avoiding introducing larger curvature of field and distortion, and can further reduce the aberration of the imaging lens, thereby improving the imaging quality of the shooting device.
In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be further defined to satisfy the following expression:
Figure DEST_PATH_GDA0003432472200000051
in the expression (3), c11Is the radius of curvature of the object-side lens surface of the first lens 101, c12Is the radius of curvature of the image side lens surface of the first lens 101. The optical system satisfying the expression (3) is beneficial to balancing the spherical aberration of an imaging system (an imaging lens and the optical system), so that the imaging lens still has good optical performance after being switched by the optical system.
In some embodiments, in order to improve the versatility of the optical system, so that the optical system can be adapted to more types of imaging lenses, still having better imaging quality. The optical system 100 may also be defined to satisfy the following expression:
0.5≤|f2/f1|≤2.5 (4)
in the expression (4), f1Is the focal length of the first lens 101, f2Is the focal length of the second lens 102. When the condition is met, the field curvature can be effectively balanced when the optical system is matched with the imaging lenses of different types, so that the optical system has better universality.
In some embodiments, to improve the versatility of the optical system, the optical system may be further defined to satisfy the following expression:
0.02≤|f3/Effl|≤0.1 (5)
in the expression (5), f3Is the focal length of the third lens 103, EfflIs the focal length of the optical system 100. When the condition is met, the field curvature can be effectively balanced when the optical system is matched with the imaging lenses of different types, so that the optical system has better universality.
In some embodiments, to further reduce the volume of the optical system, miniaturization is achieved. The third lens 103, the fourth lens 104, and the fifth lens 105 of the optical system 100 may also be cemented to form a cemented lens. The structure of the optical system can be more compact by forming the cemented lens, thereby realizing miniaturization and facilitating installation.
In some embodiments, to further reduce the volume of the optical system and to improve the imaging quality of the optical system. The optical system 100 may also be defined to satisfy the following expression:
Figure DEST_PATH_GDA0003432472200000061
in expression (6), f3Is the focal length of the third lens 103 in the cemented lens, f4Is the focal length of the fourth lens 104 in the cemented lens, f5Is the focal length of the fifth lens 105 in the cemented lens. The optical system satisfies the condition, and is beneficial to compressionThe optical path difference reduces the assembly difficulty, thereby realizing miniaturization and simultaneously keeping good optical performance.
In some embodiments, miniaturization is achieved in order to further reduce the volume of the optical system. The optical system 100 may also be defined to satisfy the following expression:
Figure DEST_PATH_GDA0003432472200000062
in the expression (7), d12Is the distance from the center point of the image side lens surface of the first lens element 101 to the center point of the object side lens surface of the second lens element 102, d23Is the distance from the center point of the image side lens surface of the second lens element 102 to the center point of the object side lens surface of the third lens element 103, TtlIs the distance from the center point of the object-side lens surface of the first lens 101 to the center point of the image-side lens surface of the fifth lens 105. Satisfying the condition makes the optical system structure more compact, and keeps good optical performance while realizing miniaturization.
In some embodiments, to improve the versatility of the optical system, the optical system may be further defined to satisfy the following expression:
d is not less than 12 mmimgLess than or equal to 26 mm (8)
In the expression (8), dimgIs the distance from the center point of the image side lens surface of the fifth lens element 105 to the imaging surface Img of the imaging lens of the photographing device. The requirement that the optical system is suitable for the flange focal length of the non-reflection camera is met under the condition, and the optical system has good universality and good optical performance.
In some embodiments, the object-side lens surface of the first lens 101 is convex.
In some embodiments, to improve the imaging quality of the optical system, the optical system 100 may be further defined to satisfy the following expression:
ND1≥1.8,VD1less than or equal to 40, and/or ND2≤1.63,VD2≥35 (9)
In expression (9), ND1Is the refractive index of the first lens 101, VD1Is the Abbe number, ND, of the first lens 1012Is the refractive index of the second lens 102, VD2The abbe number of the second lens 102. Under the condition, the optical system is favorable for compressing the imaging height to obtain the required target magnification, and meanwhile, the chromatic aberration can be well balanced, so that the shooting device obtains good optical performance.
In some embodiments, to achieve the lightness, the first lens 101, the second lens 102, the third lens 103, the fourth lens 104, and the fifth lens 105 may be defined to include at least one plastic lens.
Illustratively, the first lens 101 is a glass lens, and the second lens 102 and the third lens 103 are plastic lenses, for example. The first lens 101 is a glass lens, which can prevent the optical system from being scratched and damaging the lens, and the combination of the glass lens and the plastic lens can reduce the weight of the optical system, thereby achieving the lightness of the optical system.
It should be noted that the optical system according to the embodiment of the present application can modulate a main optical Angle (CRA) of the imaging lens from a larger frame to a smaller frame, and can better match an image sensor of the shooting device, thereby improving the quality of the shot image.
Specific numerical configurations of the optical system are given below with reference to the drawings and tables, and specifically, as shown in fig. 3 or fig. 4, the surface F1 represents an incident surface of the optical system, the two lens surfaces of the first lens 101 are the surface F2 and the surface F3, respectively, the two lens surfaces of the second lens 102 are the surface F4 and the surface F5, respectively, the two lens surfaces of the third lens 103 are the surface F6 and the surface F7, respectively, the two lens surfaces of the fourth lens 104 are the surface F7 and the surface F8, respectively, and the two lens surfaces of the fifth lens 105 are the surface F8 and the surface F9, respectively. Among them, the third lens 103, the fourth lens 104, and the fifth lens 105 are cemented lenses.
In fig. 4, the optical system 100 includes a filter lens 106 and a protective lens 107, two mirror surfaces of the filter lens 106 are a surface F10 and a surface F11, respectively, and two mirror surfaces of the protective lens 107 are a surface F12 and a surface F13, respectively.
In tables 1 and 2, the number of surfaces (Surf) represents the surface of the lens, the Type (Type) represents the shape of the surface, "STANDRAD" represents a plane, "EVENASPH" represents an aspherical surface; radius of curvature (Radius) represents the degree to which the lens surface is curved, the smaller the value, the more curved the lens surface; a separation or Thickness (thinness), which is expressed as a separation distance between lenses of an optical system on an optical axis, and a Thickness which is a center Thickness of the lenses; ND represents a refractive index of the lens; VD denotes the abbe number of the lens, also called abbe number; "Infinity" means plane; OBJ denotes the object side, STO the diaphragm surface, IMA the image side.
In Table 2, Surf represents the number of faces, K is a conic constant, and "terms of degree 4" to "degree 14" represent a2To a7Each representing a coefficient corresponding to each radial coordinate.
In Table 3, TtlIs the distance from the center point of the object side lens surface of the first lens element 101 to the center point of the image side lens surface of the fifth lens element 105, ImghIs half of the diagonal length of the effective pixel area of the optical system, and M is the magnification of the optical system.
The optical system corresponding to table 1 is referred to as example 1, and specifically is the optical system in fig. 3. The optical system corresponding to table 2, referred to as example 2, is specifically the optical system in fig. 4.
Table 1 shows the data of the respective surface parameters of the lens of the optical system of example 1
Figure DEST_PATH_GDA0003432472200000081
Table 2 shows the data of the respective surface parameters of the lens of the optical system of example 2
Figure DEST_PATH_GDA0003432472200000082
Figure DEST_PATH_GDA0003432472200000091
Table 3 relevant parameters of the optical systems of example 1 and example 2
Ttl 38.735mm
ImgH 27.5mm
M 0.8
Fig. 5 and 6 show the field curvature parameter and the distortion parameter of the optical system of the example 1 and the example 2 at the INF object distance, respectively, and it can be seen from fig. 5 and 6 that the optical system has a better imaging effect and thus a higher imaging quality.
It should be noted that, according to the above given embodiments 1 and 2, the optical design can be performed after changing one of the parameters, so as to obtain a plurality of different optical systems.
Referring to fig. 7, fig. 7 is a schematic structural diagram of a camera according to an embodiment of the present disclosure. By using the optical system 100 provided in the embodiment of the present application, the photographing device 200 is used to reduce the focal length of the imaging lens 20 of the photographing device, which not only can achieve miniaturization of the product, but also can ensure the imaging quality of the photographing device 200.
As shown in fig. 7, the photographing device 200 includes an optical system 100 disposed on the image side of the imaging lens 20 and the imaging lens 20, and the optical system can reduce the focal length of the imaging lens 20 when photographing the photographic subject 22 using the photographing device 200. Specifically, the optical system is arranged on the image side of the imaging lens 20, in the optical path of the imaging lens 20 and the image sensor of the photographing device 200. The optical system is any one of the optical systems 100 provided in the embodiments of the present application, and the image sensor may be, for example, a cmos sensor or a CCD sensor.
Specifically, the electronic device that the photographing apparatus 200 can also perform photographing includes a mobile phone, a digital camera, a motion camera, a wearable device, or a handheld pan-tilt camera. The non-reflection camera can be a medium-frame non-reflection camera or a full-frame non-reflection camera.
In some embodiments, as shown in FIG. 7, the camera 200 includes a display 211 and a capture key 212. The imaging lens 20 is used to image a photographic subject 22 (such as a scene) on an image sensor of the photographing device 200 through the optical system; the display screen 211 is used for displaying imaging, for example, displaying an image 220 of an object to be photographed, and the display screen 211 may be a touch display screen; the photographing key 212 is used to trigger photographing.
In the photographing device in the above embodiment, due to the use of the optical system provided in the embodiment of the present application, the focal length of the imaging lens of the photographing device can be effectively reduced, and at the same time, the photographing device can be miniaturized, and the field angle of the imaging lens can be ensured to be hardly changed when the photographing device is disposed on the image side of the imaging lens, so that the introduction of large curvature of field and distortion to reduce the aberration of the imaging lens is avoided, and the imaging quality of the photographing device can be improved.
Please refer to fig. 8, fig. 8 is a schematic structural diagram of a movable platform according to an embodiment of the present application. The movable platform is provided with a shooting device to realize shooting.
As shown in fig. 8, the movable platform 300 includes a platform body 30 and a photographing device 200, the photographing device 200 being mounted on the platform body 30, the photographing device including an imaging lens and an optical system disposed on an image side of the imaging lens for reducing a focal length of the imaging lens. The optical system is any one of the optical systems 100 provided in the embodiments of the present application.
Illustratively, the movable platform 300 includes any one of a drone, a robot, an unmanned vehicle, and a handheld pan/tilt head.
Wherein, this aircraft includes unmanned aerial vehicle, and this unmanned aerial vehicle includes rotor type unmanned aerial vehicle, for example four rotor type unmanned aerial vehicle, six rotor type unmanned aerial vehicle, eight rotor type unmanned aerial vehicle, also can be fixed wing unmanned aerial vehicle, can also be the combination of rotor type and fixed wing unmanned aerial vehicle, does not do the injecing here.
The robot can also be called an educational robot, a Mecanum wheel omnidirectional chassis is used, a plurality of intelligent armors are arranged on the whole body, and each intelligent armor is internally provided with a hitting detection module, so that physical hitting can be rapidly detected. Simultaneously still include the diaxon cloud platform, can rotate in a flexible way, cooperation transmitter accuracy, stability, launch crystal bullet or infrared light beam in succession, cooperation trajectory light efficiency gives the user more real shooting experience.
While the invention has been described with reference to specific embodiments, the scope of the invention is not limited thereto, and those skilled in the art can easily conceive various equivalent modifications or substitutions within the technical scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims (61)

1. An optical system disposed on an image side of an imaging lens of a photographing device for reducing a focal length of the imaging lens, the optical system comprising, in order from an object side to the image side:
a first lens having a positive refractive power;
a second lens having a negative focal power;
a third lens having a positive refractive power;
a fourth lens having a negative focal power;
a fifth lens having a positive refractive power;
the optical system has positive optical power, and the optical system satisfies the following expression:
m is more than or equal to 0.5 and less than or equal to 1, and T is more than or equal to 0.05tl/Effl≤0.45
Wherein M is the magnification of the optical system, TtlIs the distance from the center point of the object side lens surface of the first lens to the center point of the image side lens surface of the fifth lens, EfflIs the focal length of the optical system.
2. The optical system of claim 1, wherein the first, second, third, fourth, and fifth lenses comprise at least one plastic lens.
3. The optical system according to claim 1, wherein the optical system further satisfies the following expression: m is more than or equal to 0.6 and less than or equal to 0.9.
4. The optical system according to claim 1, wherein the optical system satisfies the following expression:
Figure FDA0003088219440000011
wherein, c11Is the radius of curvature of the object side lens surface of the first lens, c12Is a radius of curvature of an image side lens surface of the first lens.
5. The optical system according to claim 1, wherein the optical system satisfies the following expression:
0.5≤|f2/f1|≤2.5
wherein f is1Is the focal length of the first lens, f2Is the focal length of the second lens.
6. The optical system according to claim 1, wherein the optical system satisfies the following expression:
0.02≤|f3/Effl|≤0.1
wherein f is3Is the focal length of the third lens, EfflIs the focal length of the optical system.
7. The optical system of claim 1, wherein the third, fourth, and fifth lenses are capable of being cemented to form a cemented lens.
8. The optical system according to claim 7, wherein the optical system satisfies the following expression:
Figure FDA0003088219440000021
wherein f is3Is the focal length of the third lens in the cemented lens, f4Is the focal length of the fourth lens in the cemented lens, f5Is the focal length of the fifth lens of the cemented lenses.
9. The optical system according to claim 1, wherein the optical system satisfies the following expression:
Figure FDA0003088219440000022
wherein d is12Is the distance from the center point of the image side lens surface of the first lens to the center point of the object side lens surface of the second lens, d23Is the distance from the center point of the image side lens surface of the second lens to the center point of the object side lens surface of the third lens, TtlThe distance between the center point of the object side lens surface of the first lens and the center point of the image side lens surface of the fifth lens is included.
10. The optical system according to claim 1, wherein the optical system satisfies the following expression:
d is not less than 12 mmimgLess than or equal to 26 mm
Wherein d isimgIs the firstAnd the distance from the center point of the image side lens surface of the five lenses to the imaging surface of the imaging lens of the shooting device.
11. The optical system according to claim 1, wherein an object-side lens surface of the first lens is convex.
12. The optical system according to claim 1, wherein the optical system satisfies the following expression:
ND1≥1.8,VD1≤40
wherein ND1Is the refractive index of the first lens, VD1Is the abbe number of the first lens.
13. The optical system according to claim 1, wherein the optical system satisfies the following expression:
ND2≤1.63,VD2≥35
wherein ND2Is the refractive index of the second lens, VD2Is the abbe number of the second lens.
14. The optical system according to any one of claims 1 to 13, characterized in that the optical system comprises a filter lens arranged between the fifth lens and an imaging surface of an imaging lens of the camera.
15. The optical system of claim 14, wherein the filter lens has a thickness of 0.8 mm.
16. The optical system of claim 14, comprising a protective lens disposed between the filter lens and an image sensor of the camera for protecting a photosensitive element of the image sensor.
17. The optical system of claim 16, wherein the protective lens has a thickness of 1 millimeter.
18. The optical system of any of claims 1-13, wherein the camera comprises a non-inverting camera.
19. The optical system of claim 18, wherein the non-inverter machine comprises one of a medium-format non-inverter machine and a full-format non-inverter machine.
20. The optical system of claim 1, wherein the optical system has a defocus ratio of 0.8.
21. A photographing apparatus comprising an imaging lens and an optical system arranged on an image side of the imaging lens for reducing a focal length of the imaging lens, the optical system comprising, in order from an object side to the image side:
a first lens having a positive refractive power;
a second lens having a negative focal power;
a third lens having a positive refractive power;
a fourth lens having a negative focal power;
a fifth lens having a positive refractive power;
the optical system has positive optical power, and the optical system satisfies the following expression:
m is more than or equal to 0.5 and less than or equal to 1, and T is more than or equal to 0.05tl/Effl≤0.45
Wherein M is the magnification of the optical system, TtlIs the distance from the center point of the object side lens surface of the first lens to the center point of the image side lens surface of the fifth lens, EfflIs the focal length of the optical system.
22. The camera of claim 21, wherein the first lens, the second lens, the third lens, the fourth lens, and the fifth lens comprise at least one plastic lens.
23. The photographing apparatus according to claim 21, wherein the optical system further satisfies the following expression: m is more than or equal to 0.6 and less than or equal to 0.9.
24. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
Figure FDA0003088219440000041
wherein, c11Is the radius of curvature of the object side lens surface of the first lens, c12Is a radius of curvature of an image side lens surface of the first lens.
25. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
0.5≤|f2/f1|≤2.5
wherein f is1Is the focal length of the first lens, f2Is the focal length of the second lens.
26. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
0.02≤|f3/Effl|≤0.1
wherein f is3Is the focal length of the third lens, EfflIs the focal length of the optical system.
27. The camera of claim 21, wherein the third lens, the fourth lens, and the fifth lens are capable of being cemented to form a cemented lens.
28. The photographing apparatus according to claim 27, wherein the optical system satisfies the following expression:
Figure FDA0003088219440000051
wherein f is3Is the focal length of the third lens in the cemented lens, f4Is the focal length of the fourth lens in the cemented lens, f5Is the focal length of the fifth lens of the cemented lenses.
29. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
Figure FDA0003088219440000052
wherein d is12Is the distance from the center point of the image side lens surface of the first lens to the center point of the object side lens surface of the second lens, d23Is the distance from the center point of the image side lens surface of the second lens to the center point of the object side lens surface of the third lens, TtlThe distance between the center point of the object side lens surface of the first lens and the center point of the image side lens surface of the fifth lens is included.
30. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
d is not less than 12 mmimgLess than or equal to 26 mm
Wherein d isimgThe distance between the center point of the image side lens surface of the fifth lens element and the imaging surface of the imaging lens of the shooting device is shown.
31. The imaging device according to claim 21, wherein an object-side lens surface of the first lens is a convex surface.
32. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
ND1≥1.8,VD1≤40
wherein ND1Is the refractive index of the first lens, VD1Is the abbe number of the first lens.
33. The photographing apparatus according to claim 21, wherein the optical system satisfies the following expression:
ND2≤1.63,VD2≥35
wherein ND2Is the refractive index of the second lens, VD2Is the abbe number of the second lens.
34. The camera of any one of claims 21-33, wherein said optical system comprises a filter lens disposed between said fifth lens and an imaging surface of an imaging lens of said camera.
35. The camera of claim 34, wherein the filter lens has a thickness of 0.8 mm.
36. The camera of claim 34, wherein the optical system comprises a protective lens disposed between the filter lens and an image sensor of the camera for protecting a photosensitive element of the image sensor.
37. The camera of claim 36, wherein the protective lens has a thickness of 1 mm.
38. The camera of any one of claims 21-33, wherein the camera comprises a non-inverting camera.
39. The camera of claim 38, wherein the non-inverter machine comprises one of a medium-format non-inverter camera and a full-format non-inverter camera.
40. The imaging apparatus according to claim 21, wherein a defocus ratio of the optical system is 0.8.
41. A movable platform is characterized by comprising a platform body and a shooting device, wherein the shooting device is carried on the platform body; the shooting device comprises an imaging lens and an optical system, wherein the optical system is arranged at the image side of the imaging lens and used for reducing the focal length of the imaging lens, and the optical system comprises the following components in sequence from the object side to the image side:
a first lens having a positive refractive power;
a second lens having a negative focal power;
a third lens having a positive refractive power;
a fourth lens having a negative focal power;
a fifth lens having a positive refractive power;
the optical system has positive optical power, and the optical system satisfies the following expression:
m is more than or equal to 0.5 and less than or equal to 1, and T is more than or equal to 0.05tl/Effl≤0.45
Wherein M is the magnification of the optical system, TtlIs the distance from the center point of the object side lens surface of the first lens to the center point of the image side lens surface of the fifth lens, EfflIs the focal length of the optical system.
42. The movable platform of claim 41, wherein the first, second, third, fourth, and fifth lenses comprise at least one plastic lens.
43. The movable platform of claim 41, wherein the optical system further satisfies the expression: m is more than or equal to 0.6 and less than or equal to 0.9.
44. The movable platform of claim 41, wherein the optical system satisfies the expression:
Figure FDA0003088219440000071
wherein, c11Is the radius of curvature of the object side lens surface of the first lens, c12Is a radius of curvature of an image side lens surface of the first lens.
45. The movable platform of claim 41, wherein the optical system satisfies the expression:
0.5≤|f2/f1|≤2.5
wherein f is1Is the focal length of the first lens, f2Is the focal length of the second lens.
46. The movable platform of claim 41, wherein the optical system satisfies the expression:
0.02≤|f3/Effl|≤0.1
wherein f is3Is the focal length of the third lens, EfflIs the focal length of the optical system.
47. The movable platform of claim 41, wherein the third lens, fourth lens, and fifth lens are capable of being cemented to form a cemented lens.
48. The movable platform of claim 47, wherein the optical system satisfies the expression:
Figure FDA0003088219440000072
wherein f is3Is the focal length of the third lens in the cemented lens, f4Is the focal length of the fourth lens in the cemented lens, f5Is the focal length of the fifth lens of the cemented lenses.
49. The movable platform of claim 41, wherein the optical system satisfies the expression:
Figure FDA0003088219440000073
wherein d is12Is the distance from the center point of the image side lens surface of the first lens to the center point of the object side lens surface of the second lens, d23Is the distance from the center point of the image side lens surface of the second lens to the center point of the object side lens surface of the third lens, TtlThe distance between the center point of the object side lens surface of the first lens and the center point of the image side lens surface of the fifth lens is included.
50. The movable platform of claim 41, wherein the optical system satisfies the expression:
d is not less than 12 mmimgLess than or equal to 26 mm
Wherein d isimgThe distance between the center point of the image side lens surface of the fifth lens element and the imaging surface of the imaging lens of the shooting device is shown.
51. The movable platform of claim 41, wherein the object-side lens surface of the first lens is convex.
52. The movable platform of claim 41, wherein the optical system satisfies the expression:
ND1≥1.8,VD1≤40
wherein ND1Is the first lensRefractive index of (D)1Is the abbe number of the first lens.
53. The movable platform of claim 41, wherein the optical system satisfies the expression:
ND2≤1.63,VD2≥35
wherein ND2Is the refractive index of the second lens, VD2Is the abbe number of the second lens.
54. The movable platform of any one of claims 41-53, wherein the optical system comprises a filter optic disposed between the fifth lens and an imaging surface of an imaging lens of the camera.
55. The movable platform of claim 54, wherein the filter lens has a thickness of 0.8 mm.
56. The movable platform of claim 54, wherein the optical system comprises a protective lens disposed between the filter lens and an image sensor of the camera for protecting a photosensitive element of the image sensor.
57. The movable platform of claim 56, wherein the protective lens has a thickness of 1 millimeter.
58. The movable platform of any one of claims 41-53, wherein the camera comprises a non-inverting camera.
59. The movable platform of claim 58, wherein the non-inverter machine comprises one of a medium-format non-inverter machine and a full-format non-inverter machine.
60. The movable platform of claim 41, wherein the optical system has a defocus ratio of 0.8.
61. The movable platform of claim 41, wherein the movable platform comprises a drone, a robot, or a handheld pan-tilt head.
CN202090000287.7U 2020-08-31 2020-08-31 Optical system, imaging device, and movable platform Expired - Fee Related CN216210172U (en)

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JPS60136712A (en) * 1983-12-26 1985-07-20 Nippon Kogaku Kk <Nikon> Rear conversion lens
US8903232B1 (en) * 2013-08-05 2014-12-02 Caldwell Photographic, Inc. Optical attachment for reducing the focal length of an objective lens
CN203365783U (en) * 2013-08-09 2013-12-25 徐中一 Novel focal-reduction light-enhancing mount
JP6413211B2 (en) * 2013-08-22 2018-10-31 株式会社ニコン Rear wide converter lens, imaging device having the rear wide converter lens, and manufacturing method of the rear wide converter lens
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