CN210690926U - Optical system and imaging device - Google Patents
Optical system and imaging device Download PDFInfo
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- CN210690926U CN210690926U CN201921586616.6U CN201921586616U CN210690926U CN 210690926 U CN210690926 U CN 210690926U CN 201921586616 U CN201921586616 U CN 201921586616U CN 210690926 U CN210690926 U CN 210690926U
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Abstract
The utility model discloses an optical system and shooting device, this optical system includes: the lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side, wherein the first lens and the second lens both have negative diopter, and the third lens has positive diopter; at least one of the first lens, the second lens and the third lens is an aspheric lens; at least one of the first lens, the second lens and the third lens is a plastic lens; the optical system is fullFoot: 0 < | f1/f2|＜1，1.5＜|f2/f3|＜3，vd1＞20，vd2＞45，vd3Is more than 20; wherein f is1、f2、f3Respectively the focal length of the lens; vd1、vd2、vd3Abbe numbers of the lenses are respectively. The optical system can increase the field angle of the shooting device and improve the imaging quality of the shooting device.
Description
Technical Field
The utility model relates to an optics technical field especially relates to an optical system and use optical system's shooting device.
Background
With the improvement of living standard of materials, people's demand for photography gradually increases, and the prices of single lens reflex cameras and micro single cameras are high, so that portable hand-held cameras gradually come into the visual field of people. However, due to the requirements and limitations of the product size, cost and appearance of the existing camera, the actual field angle of the optical system of the handheld camera is small, and the optical system increasing the field angle in the market is low-end, and is not completely combined with the actual handheld camera system for image quality optimization, so that the overall image quality is poor, the imaging quality cannot meet the requirements of people, and the handheld camera has a large size and a heavy weight, and is not favorable for the portable requirement.
SUMMERY OF THE UTILITY MODEL
Based on the above, the present application provides an optical system and a shooting device, wherein the optical system is used for increasing the field angle of the shooting device, and simultaneously, the optical system can reduce the volume and improve the imaging quality.
In a first aspect, the present application provides an optical system comprising: the optical lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side, wherein the first lens and the second lens both have negative diopter, and the third lens has positive diopter; at least one of the first lens, the second lens and the third lens is an aspheric lens; at least one of the first lens, the second lens and the third lens is a plastic lens; the optical system satisfies the following expression:
0＜|f1/f2|＜1，1.5＜|f2/f3|＜3，vd1＞20，vd2＞45，vd3＞20
wherein f is1、f2、f3The focal lengths of the first lens, the second lens and the third lens are respectively; vd1、vd2、vd3The abbe numbers of the first lens, the second lens and the third lens are respectively.
In a second aspect, the present application also provides a photographing apparatus including an optical system and a photographing device, the optical system including: the optical lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side, wherein the first lens and the second lens both have negative diopter, and the third lens has positive diopter; at least one of the first lens, the second lens and the third lens is an aspheric lens; at least one of the first lens, the second lens and the third lens is a plastic lens; the optical system satisfies the following expression:
0＜|f1/f2|＜1，1.5＜|f2/f3|＜3，vd1＞20，vd2＞45，vd3＞20
wherein f is1、f2、f3The focal lengths of the first lens, the second lens and the third lens are respectively; vd1、vd2、vd3The abbe numbers of the first lens, the second lens and the third lens are respectively.
An embodiment of the present application provides an optical system and a photographing apparatus using the same, the optical system including: the optical lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side, wherein the first lens and the second lens both have negative diopter, and the third lens has positive diopter; the optical system satisfies the following expression: 0 < | f1/f2|＜1，1.5＜|f2/f3|＜3，vd1＞20，vd2＞45，vd3Is more than 20; wherein f is1、f2、f3The focal lengths of the first lens, the second lens and the third lens are respectively; vd1、vd2、vd3The abbe numbers of the first lens, the second lens and the third lens are respectively. The optical system only uses three lenses and has a compact structure, so that the volume and the weight of the optical system can be reduced, the field angle of the shooting device is increased by utilizing the combination of the three lenses and the setting of specific parameters, the universality is strong, the processing is convenient, and the imaging quality of the shooting device is improved.
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 according to an embodiment of the present application;
fig. 2 is a schematic configuration diagram of an optical system according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of a photographing apparatus according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of a shooting device according to an embodiment of the present application.
Description of the main elements and symbols:
10. an optical system; 101. a first lens; 102. a second lens; 103. a third lens;
20. a photographing device; 21. a photographing device; 210. a lens group; 211. a display screen; 212. and (5) shooting a key.
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.
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 used for increasing the field angle of the shooting device, and meanwhile, the optical system is small in size and can improve the imaging quality.
As shown in fig. 1, the optical system 10 includes: a first lens 101, a second lens 102, and a third lens 103. The first lens 101 and the second lens 102 each have a negative refractive power, i.e., have a negative refractive power; the third lens 103 has a positive refractive power, i.e., has a positive refractive power.
The first lens 101, the second lens 102, and the third lens 103 are arranged in order from the object side to the image side.
The optical system 10 satisfies the following expression:
0＜|f1/f2|＜1，1.5＜|f2/f3|＜3，vd1＞20，vd2＞45，vd3＞20 (1)
in the expression (1), f1、f2、f3Focal lengths of the first lens 101, the second lens 102, and the third lens 103, respectively; vd1、vd2、vd3Abbe numbers of the first lens 101, the second lens 102, and the third lens 103, respectively.
In addition, the object side and the image side in the sequential arrangement from the object side to the image side are the object side and the image side of the optical system 10, respectively.
It is understood that the first lens 101, the second lens 102, and the third lens 103 are arranged in order along the optical axis from the object side to the image side.
It is understood that the diameters of the first lens 101, the second lens 102, and the third lens 103 are different in the embodiments of the present application. In some embodiments, however, the diameters of the first lens 101, the second lens 102, and the third lens 103 may be the same.
Illustratively, for convenience of configuration, the diameters of the first lens 101, the second lens 102, and the third lens 103 are set the same.
In one embodiment, the first lens 101 may be a concave lens, specifically including a biconcave lens, a plano-concave lens, and the like, and the second lens 102 and the third lens 103 may be meniscus lenses.
In one embodiment, at least one of the first lens element 101, the second lens element 102 and the third lens element 103 is a lens element made of a common material, such as a plastic lens. That is, the first lens 101, the second lens 102 and the third lens 103 may be partially glass lenses and partially plastic lenses; or all plastic lenses. Thereby, the weight of the optical system can be further reduced. The light weight of the optical system is realized, so that the optical system is convenient for users to use.
In one embodiment, the length of the optical system 10 is designed to be less than 7 millimeters. Thereby realizing miniaturization and light weight of the optical system. Of course, in other embodiments, the length of the optical system 10 may be designed to be other lengths, and the specific length range is not limited herein.
In one embodiment, to improve the system's etendue and imaging quality, the first lens 101 satisfies expression (2) and/or expression (3), where expression (2) and expression (3) are:
1.55＜nd1＜1.70 (2)
20＜vd1＜45 (3)
therein, nd1Is the refractive index of the first lens 101; vd1Is the abbe number of the first lens 101.
In one embodiment, to improve the system's etendue and imaging quality, the second lens 102 satisfies expression (4) and/or expression (5), where expression (4) and expression (5) are:
1.50＜nd2＜1.60 (4)
45＜vd2＜65 (5)
therein, nd2Is the refractive index of the second lens 102, vd2Is the abbe number of the second lens 102.
In one embodiment, to improve the system's etendue and imaging quality, the third lens 103 satisfies expression (6) and/or expression (7), where expression (6) and expression (7) are:
1.55＜nd3＜1.70 (6)
20＜vd3＜45 (7)
therein, nd3Refractive index of the third lens 103, vd3Is the abbe number of the third lens 103.
In one embodiment, the optical system 10 satisfies the following expression:
0.05＜T1/TL＜0.20，0.10＜T2/TL＜0.25，0.30＜T3/TL＜0.50 (8)
0.50＜(T1+T2)/T3＜1.00 (9)
6＜A1/A2＜8，0.15＜A1/TL＜0.40 (10)
wherein, TLIs the distance, T, from the center of the object side of the first lens to the center of the image side of the third lens1、T2And T3Is a central thickness of the first to third lenses, A1Is the distance between the first lens and the second lens, A2Is the spacing between the second lens and the third lens.
T1Is the center thickness of the optic of the first lens 101; t is2Is the center thickness of the optic of the second lens 102; t is3The third lens 103 has a central optic thickness.
By designing the distance and the spacing, the structural design of the optical system can be more compact, thereby further improving the miniaturization and the lightness of the whole optical system and simultaneously improving the imaging quality of the optical system.
In one embodiment, the first lens 101, the second lens 102, and the third lens 103 are all aspheric lenses. By adopting the full aspheric surface design, the spherical aberration, chromatic aberration, distortion and the like can be avoided; higher resolving power is obtained, and the imaging quality of the optical system is further improved.
In one embodiment, both mirror surfaces of the aspheric lens are high order aspheric surfaces. The high-order aspherical surface satisfies the following expression:
wherein z is an aspheric rotational symmetry axis, and c is a vertex curvature; y is a radial coordinate having a unit equal to the unit length of the lens(ii) a k is a conic constant, a1To a8Each representing a coefficient corresponding to each radial coordinate.
Specific numerical configurations of the optical system are given below in conjunction with the drawings and tables, as shown in fig. 2, the numbers of faces 1, 2,. and 6 represent surface numbers in the optical system, and represent mirror surfaces of the first lens 101, the second lens 102 and the third lens 103, respectively; x represents an optical axis, O represents an object plane, and I represents an image plane.
In tables 1 and 2, nd represents a refractive index of the lens, and vd represents an abbe number, i.e., an abbe number, of the lens. k is a conic constant, a1To a8Each representing a coefficient corresponding to each radial coordinate.
Specifically, table 1 and table 2 show specific numerical configurations of the optical system. An optical system having the numerical configurations of tables 1 and 2 is shown in detail in fig. 1 or 2.
Table 1 shows parameters of respective lenses of the optical system
TABLE 2 aspheric parameters of the surfaces of the optical system
The optical system in the above embodiment uses three lenses, and the design structure is compact, so the volume and weight of the optical system can be reduced, the combination of the three lenses and the specific parameter setting are used to increase the field angle of the shooting device, and the imaging quality of the shooting device is improved.
Referring to fig. 3, fig. 3 is a schematic structural diagram of a camera according to an embodiment of the present disclosure. The photographing device uses an optical system to increase the field angle for achieving an imaging effect of a large image plane and high image quality.
As shown in fig. 3, the photographing device 20 includes an optical system 10 and a photographing apparatus 21, and the optical system 10 employs any one of the optical systems provided in the above-described embodiments.
The shooting device 20 is an electronic device capable of shooting, and includes a mobile phone, a digital camera, a motion camera, a wearable device, or a handheld pan-tilt camera.
Wherein the optical system 10 and the photographing apparatus 21 are detachably connected or fixedly connected. The detachable connection is convenient for users to use.
Illustratively, the optical system 10 and the shooting device 21 are fixed by one or more of magnetic attraction, adhesion, screw threads, or snap connection. Taking magnetic attraction as an example, when the optical system 10 and the shooting device 21 are fixed in a magnetic attraction manner, the optical system 10 and the shooting device 21 are connected in a magnetic attraction manner, specifically, a magnet may be installed on the optical system 10, and a magnetic pole or a metal piece with opposite polarity for attracting the magnet is installed at a corresponding position of the shooting device 21. Vice versa, the magnet can also be installed on the shooting device 21, and the optical system 10 is installed with opposite magnetic poles or metal pieces for the magnet to attract. Through the arrangement, the problem of interface abrasion easily caused under frequent assembly and disassembly can be avoided while the installation and blind operation of a user are facilitated.
As shown in fig. 4, the photographing apparatus 21 is a motion camera, and includes a lens group 210, a display 211 and a photographing button 212. The lens group 210 is used for imaging the scene on a sensor of the photographing device 21, such as a cmos sensor or a CCD sensor; the display screen 211 is used for displaying imaging, and the display screen 211 is a touch display screen; the photographing key 212 is used to trigger photographing.
The shooting device 21 comprises a lens group 210, and the third lens 103 is kept at a certain distance from the outermost lens of the lens group 210. For example, greater than 4mm, to ensure no direct contact between the optical system 10 and the camera 21, thereby improving safety.
In one embodiment, the optical system 10 matches the lens parameters of the capture device 21. Thereby improving the imaging quality.
Illustratively, the lens parameters of the optical system 10 include: the aperture, the aperture and the image plane, wherein the aperture and the aperture of the optical system 10 are consistent with those of the shooting equipment, so that the consistency of the image quality of the image plane of the whole system is ensured.
In one embodiment, the lens parameters include an image plane, and the image plane is greater than 16 mm. And then the large image plane imaging is realized through the arrangement of the optical system or the matching of the optical system and the shooting equipment. And then solved current camera's the little problem of imaging surface.
In one embodiment, the field angle of the photographing device 20 can be made larger than 108 ° by using the optical system 10. Therefore, the shooting range is large, the imaging is clear, and the shooting of different object distances from 0.2m to infinity can be realized.
In one embodiment, the diameters of the first lens 101, the second lens 102, and the third lens 103 of the optical system 10 are each larger than the diameter of the mirror of the photographing apparatus 21. Therefore, large image plane imaging can be realized, and the problems that the imaging plane of the existing shooting device is small, the imaging plane is mostly smaller than the image plane with the diameter of 16mm, the resolution ratio is low, the image quality is poor and the like are solved.
The shooting device in the above embodiment uses the optical system provided in the embodiment of the present application, so that the field angle of the shooting device can be increased, and the imaging quality of the shooting device is improved.
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 (15)
1. An optical system, comprising: the optical lens comprises a first lens, a second lens and a third lens which are arranged in sequence from an object side to an image side, wherein the first lens and the second lens both have negative diopter, and the third lens has positive diopter; at least one of the first lens, the second lens and the third lens is an aspheric lens; at least one of the first lens, the second lens and the third lens is a plastic lens;
the optical system satisfies the following expression:
0＜|f1/f2|＜1，1.5＜|f2/f3|＜3，vd1＞20，vd2＞45，vd3＞20
wherein f is1、f2、f3The focal lengths of the first lens, the second lens and the third lens are respectively; vd1、vd2、vd3The abbe numbers of the first lens, the second lens and the third lens are respectively.
2. The optical system of claim 1, wherein the first, second and third lenses are plastic lenses.
3. The optical system according to claim 1, wherein the first lens satisfies the following expression:
1.55＜nd1＜1.70，20＜vd1＜45
therein, nd1Is the refractive index of the first lens, vd1Is the abbe number of the first lens.
4. The optical system according to claim 1, wherein the second lens satisfies the following expression:
1.50＜nd2＜1.60，45＜vd2＜65
therein, nd2Is the refractive index of the second lens, vd2Is the abbe number of the second lens.
5. The optical system according to claim 1, wherein the third lens satisfies the following expression:
1.55＜nd3＜1.70，20＜vd3＜45
therein, nd3Is the refractive index of the third lens, vd3Is the abbe number of the third lens.
6. The optical system according to any one of claims 1 to 5, characterized in that the optical system satisfies the following expression:
0.05＜T1/TL＜0.20，0.10＜T2/TL＜0.25，0.30＜T3/TL＜0.50；
0.50＜(T1+T2)/T3＜1.00；
6＜A1/A2＜8，0.15＜A1/TL＜0.40；
wherein, TLIs the distance, T, from the center of the object side surface of the first lens to the center of the image side surface of the third lens1、T2And T3Is a central thickness of the first to third lenses, A1Is the distance between the first lens and the second lens, A2Is the spacing between the second lens and the third lens.
7. The optical system of claim 1, wherein the first, second, and third lenses are aspheric lenses.
8. The optical system of claim 7, wherein both mirror surfaces of the aspheric lens are high order aspheric surfaces.
9. The optical system of claim 1, wherein the optical system has a length of less than 7 millimeters.
10. A photographing apparatus characterized by comprising an optical system including the optical system of any one of claims 1 to 9 and a photographing device.
11. The camera device of claim 10, wherein the optical system is fixedly connected to the camera device by one or more of magnetic attraction, adhesion, screw threads, or snap fit; the shooting equipment comprises a lens group, and the third lens keeps a certain distance with the outermost lens of the lens group.
12. The camera of claim 10, wherein the optical system matches lens parameters of the camera.
13. The camera of claim 12, wherein the lens parameters include an image plane, and wherein the image plane is greater than 16 mm.
14. The camera of claim 10, wherein the camera has a field angle greater than 108 °.
15. The camera of claim 10, wherein the first, second and third lenses each have a diameter greater than a diameter of an optic of the camera device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921586616.6U CN210690926U (en) | 2019-09-23 | 2019-09-23 | Optical system and imaging device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921586616.6U CN210690926U (en) | 2019-09-23 | 2019-09-23 | Optical system and imaging device |
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| Publication Number | Publication Date |
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| CN210690926U true CN210690926U (en) | 2020-06-05 |
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| CN201921586616.6U Expired - Fee Related CN210690926U (en) | 2019-09-23 | 2019-09-23 | Optical system and imaging device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112154364A (en) * | 2019-09-23 | 2020-12-29 | 深圳市大疆创新科技有限公司 | Optical system and imaging device |
| CN113490877A (en) * | 2020-07-31 | 2021-10-08 | 深圳市大疆创新科技有限公司 | Optical system, imaging device, and movable platform |
-
2019
- 2019-09-23 CN CN201921586616.6U patent/CN210690926U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112154364A (en) * | 2019-09-23 | 2020-12-29 | 深圳市大疆创新科技有限公司 | Optical system and imaging device |
| CN113490877A (en) * | 2020-07-31 | 2021-10-08 | 深圳市大疆创新科技有限公司 | Optical system, imaging device, and movable platform |
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