CN214846009U - Optical system and zoom lens - Google Patents
Optical system and zoom lens Download PDFInfo
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- CN214846009U CN214846009U CN202121285320.8U CN202121285320U CN214846009U CN 214846009 U CN214846009 U CN 214846009U CN 202121285320 U CN202121285320 U CN 202121285320U CN 214846009 U CN214846009 U CN 214846009U
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Abstract
The utility model relates to an optical system (1) and zoom lens, optical system include along the first fixed group (G1) that has positive focal power that the optical axis arranged in proper order from the object side to image side, have the group of zooming (G2) of negative focal power, diaphragm (STOP), have the second fixed group (G3) of positive focal power and have the group of focusing (G4) of positive focal power, zoom group (G2) with focus group (G4) and can follow the optical axis and move, first fixed group (G1) includes three lenses, zoom group (G2) includes four pieces of lens, and second fixed group (G3) contains six or seven pieces of lens, focus group (G4) includes four or three pieces of lens. The utility model discloses can satisfy that visible light and infrared light are confocal, high low temperature do not virtual burnt, high image quality and tolerance sensitivity are lower.
Description
Technical Field
The utility model relates to an optical imaging technical field especially relates to an optical system and zoom.
Background
With the development of social economy, highway networks are increasingly dense and traffic is increasingly busy, and in order to maintain traffic safety, prevent traffic jams and achieve orderly traffic under busy road conditions, the development of an intelligent traffic security system has practical significance for improving the management level of roads. The video camera system is an important component in an intelligent traffic security system, and the video camera lens series in the prior art hardly simultaneously satisfy the characteristics of confocal visible light and infrared light, high and low temperature without virtual focus, high image quality and low tolerance sensitivity.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to solve the above problems, and to provide an optical system and a zoom lens.
In order to realize the above object of the present invention, the present invention provides an optical system and a zoom lens, the optical system includes a first fixed group with positive focal power, a group of zooming with negative focal power, a diaphragm, a second fixed group with positive focal power and a group of focusing with positive focal power, which are sequentially arranged from an object side to an image side along an optical axis, the group of zooming and the group of focusing can move along the optical axis, the first fixed group includes three lenses, the group of zooming includes four lenses, the second fixed group includes six or seven lenses, the group of focusing includes four or three lenses.
According to an aspect of the present invention, the first fixed group includes a first lens of a convex-concave type having negative refractive power, a second lens of a convex-convex type or a convex-concave type having positive refractive power, and a third lens of a convex-concave type having positive refractive power, which are arranged in order from the object side to the image side.
According to an aspect of the present invention, the first lens and the second lens are cemented to form a cemented lens group.
According to an aspect of the present invention, the zoom group includes a fourth lens of a concave-convex type having negative power, a fifth lens of a concave-concave type having negative power, a sixth lens of a concave-concave type having negative power, and a seventh lens of a convex-convex type having positive power, which are arranged in order from the object side to the image side.
According to an aspect of the present invention, the sixth lens element and the seventh lens element are cemented to form a cemented lens group.
According to an aspect of the present invention, the second fixed group includes, arranged in order from the object side to the image side, an eighth lens of a convex-convex type having positive power, a ninth lens of a concave-concave type having negative power or a convex-concave type having positive power, a tenth lens of a convex-convex type having positive power or a concave-concave type having negative power, an eleventh lens of a concave-convex type having negative power or a convex-convex type having positive power, a twelfth lens of a concave-convex type having positive power or negative power, and a thirteenth lens of a concave-convex type having positive power.
According to an aspect of the present invention, the ninth lens, the tenth lens and the eleventh lens are cemented to form a cemented lens group, or the tenth lens, the eleventh lens and the twelfth lens are cemented to form a cemented lens group.
According to an aspect of the present invention, the focusing group includes a fourteenth lens of a convex-concave type having a negative refractive power, a fifteenth lens of a convex-convex type having a positive refractive power, a sixteenth lens of a convex-convex type having a positive refractive power, and a seventeenth lens of a concave-convex type having a negative refractive power, which are arranged in order from the object side to the image side.
According to an aspect of the present invention, the fourteenth lens element is cemented with the fifteenth lens element to form a cemented lens group, and the sixteenth lens element is cemented with the seventeenth lens element to form a cemented lens group.
According to an aspect of the present invention, the second fixed group includes, arranged in order from the object side to the image side, an eighth lens of convex-convex type having positive power, a ninth lens of concave-concave type having negative power, a tenth lens of convex-convex type having positive power, an eleventh lens of concave-convex type having negative power, a twelfth lens of concave-convex type having positive power, a thirteenth lens of concave-concave type having negative power, and a fourteenth lens of convex-convex type having positive power.
According to an aspect of the present invention, the assembly of the cemented lens group is composed of the ninth lens, the tenth lens and the eleventh lens, and the assembly of the cemented lens group is composed of the thirteenth lens and the fourteenth lens.
According to an aspect of the present invention, the focusing group includes a fifteenth lens of a concave type having a negative refractive power, a sixteenth lens of a convex type having a positive refractive power, and a seventeenth lens of a convex type having a positive refractive power, which are arranged in order from the object side to the image side.
According to an aspect of the present invention, the fifteenth lens element is cemented with the sixteenth lens element to form a cemented lens group.
According to an aspect of the present invention, the wide-angle end focal length fw and the telephoto end focal length ft of the optical system satisfy the following relationship: ft/fw is not less than 3.
According to an aspect of the present invention, the wide-angle end focal length fw and the distance TLw from the object side surface of the first lens to the image side surface of the last lens of the wide-angle end of the optical system satisfy the following relationship: fw/TLw is more than or equal to 0.1.
According to an aspect of the present invention, the wide-angle end focal length fw of the optical system satisfies the following relationships with the focal length f1 of the first fixed group, the focal length f2 of the zoom group, the focal length f3 of the second fixed group, and the focal length f4 of the focus group, respectively: f1/fw is less than or equal to 6.5; f2/fw is less than or equal to-1.5; f3/fw is less than or equal to 4.5; f4/fw is less than or equal to 4.5.
According to an aspect of the present invention, the moving distance D1 from the telephoto end to the telephoto end of the zoom group and the moving distance D2 from the telephoto end to the telephoto end of the focus group satisfy the following relationships with the distance TLw from the object side surface of the first lens to the image side surface of the last lens at the wide-angle end, respectively: | D1/TLw | ≦ 0.35; | D2/TLw | ≦ 0.1.
According to an aspect of the present invention, the focal length Fa of the cemented lens group in the first fixed group and the focal length f1 of the first fixed group, the focal length Fb of the cemented lens group in the zoom group and the focal length f2 of the zoom group satisfy the following relationships, respectively: fa/f1 is more than or equal to 3.5; fb/f2 is not less than-4.5.
According to an aspect of the present invention, the focal length Fc of the cemented lens group in the second fixed group and the focal length f3 of the second fixed group satisfy the following relationship: 1.5-2.5 of Fc/f 3.
According to an aspect of the present invention, the wide-angle end focal length fw of the optical system and the focal length Fd of the cemented lens group in the focusing group satisfy the following relationship: fd/fw is more than or equal to-12 and less than or equal to 1.5.
According to an aspect of the utility model, the second fixed group with in the group of focusing, the abbe number VD of at least one piece of lens satisfies following condition: VD is more than or equal to 65.
The zoom lens also comprises a cylindrical spectroscope which is positioned at the image side of the optical system;
the object side surface of the cylindrical surface spectroscope is a plane, and the image side surface of the cylindrical surface spectroscope is a cylindrical surface with an inclination angle of 0-2 degrees with the object side surface;
the object side surface of the cylindrical spectroscope is plated with a spectroscope film system, and the thickness of the cylindrical spectroscope is less than 3 mm;
the image side surface of the cylindrical spectroscope is a spherical cylindrical surface or an aspheric cylindrical surface, and is a convex surface or a concave surface;
the optical axis of the cylindrical spectroscope is perpendicular to the object side surface and passes through the center of the object side surface, the optical axis of the cylindrical spectroscope and the optical axis of the optical system are mutually inclined, and the inclination angle is 30-50 degrees;
and the intersection point of the optical axis of the cylindrical spectroscope and the object side surface is superposed with or deviated from the optical axis of the optical system by 0-5 mm.
According to one aspect of the present invention, the optical system further comprises a compensation device located on the image side of the cylindrical beam splitter;
the compensation device is a compensation mirror, the object side surface is a plane, and the image side surface is a plane or a curved surface with an inclination angle of 0-2 degrees with the object side surface.
According to the utility model discloses a scheme, optical system comprises first, the fixed group of second and zoom group and focus group, and wherein, the fixed group of second can contain six or seven pieces of lenses, and focus group can contain four or three pieces of lenses for optical system can satisfy that visible light and infrared light are confocal, high low temperature are not virtual burnt, high image quality and tolerance sensitivity are lower.
According to the utility model discloses a scheme, rationally set up lens composition, roughness and focal power in each mirror group to rationally make two or three pieces of veneer component veneer mirror groups, can make optical system realize that high low temperature is not virtual burnt and visible light and infrared light are confocal.
According to the utility model discloses a scheme can make optical system realize the characteristics of little volume, total length through the relation of the distance of rationally setting up the first piece of lens object side to last piece of lens image side of system wide-angle end focus and telephoto end focus and wide-angle end.
According to the utility model discloses a scheme is through the reasonable relation that sets up optical system wide-angle end focus and each focus of organizing, can be so that the optical system tolerance is better, make light move towards steadily to the equipment precision is higher.
According to the utility model discloses a scheme zooms the relation that the group was followed the moving distance of telephoto end to the telephoto end and was focused the distance of group from telephoto end to the telephoto end and the first piece of lens object side of wide-angle end to the distance of last piece of lens image side through reasonable setting, can be so that optical system group when becoming doubly moves more conveniently, and sensitivity is high for system is small, total length.
According to the utility model discloses a scheme is through the relation of the fixed group of the cemented mirror group in organizing of reasonable setting first fixed group, zooming group and second and rather than the focal length of the group of the place mirror to and the relation of optical system wide-angle end focus and the focal length of the cemented mirror group of focusing in organizing, be favorable to proofreading and correct the colour difference, make the system tolerance sensitivity lower.
According to the utility model discloses a scheme makes the fixed group of second and focuses the abbe number of one piece of lens at least in the group and be greater than a definite value, is favorable to the aberration of the infrared light part of correction system for the system satisfies that visible light and infrared light are confocal.
According to the utility model discloses a scheme, among the zoom, set up the cylinder spectroscope at optical system's image side, can make optical system can carry out two Sensor formation of image. The object and image in the cylindrical spectroscope have opposite inclination angles, so that the aberration influence caused by the inclined arrangement of the cylindrical spectroscope can be reduced.
According to the utility model discloses a scheme, in the zoom, set up the compensating mirror at the image side of cylinder spectroscope to can further reduce the system aberration influence that the cylinder spectroscope brought.
Drawings
Fig. 1 is a schematic diagram showing a configuration of an optical system according to a first embodiment of the present invention;
fig. 2 is a schematic diagram showing a structure of an optical system according to a second embodiment of the present invention;
fig. 3 is a schematic diagram showing a structure of an optical system according to a third embodiment of the present invention;
fig. 4 is a schematic diagram showing a structure of a zoom lens (having only a spectroscope) according to an embodiment of the present invention;
fig. 5 schematically shows a configuration diagram of a zoom lens (having a compensator) according to another embodiment of the present invention.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.
Referring to fig. 1, the optical system 1 of the present invention includes a first fixed group G1 having positive optical power, a zoom group G2 having negative optical power, a STOP, a second fixed group G3 having positive optical power, and a focus group G4 (or focus group) having positive optical power, which are arranged in order from the object side to the image side along the optical axis. The zooming group G2 and the focusing group G4 can move along the optical axis, and zooming and focusing of the optical system are completed. The utility model discloses in, first fixed group G1 includes three pieces of lens, and group G2 zooms includes four pieces of lens, and the fixed group G3 of second contains six pieces or seven pieces of lens, focuses group G4 and includes four pieces or three pieces of lens.
In the present invention, the first fixed group G1 includes a first lens L1 having a concave-convex type with negative focal power, a second lens L2 having a convex-convex type or a concave-convex type with positive focal power, and a third lens L3 having a concave-convex type with positive focal power, which are sequentially arranged from the object side to the image side. The first lens element L1 and the second lens element L2 are combined into a cemented lens assembly. The zoom group G2 includes, in order from the object side to the image side, a fourth lens L4 of a concave-convex type having negative optical power, a fifth lens L5 of a concave-concave type having negative optical power, a sixth lens L6 of a concave-concave type having negative optical power, and a seventh lens L7 of a convex-convex type having positive optical power. The sixth lens element L6 and the seventh lens element L7 are combined into a cemented lens assembly.
The second fixed group G3 includes, arranged in order from the object side to the image side, an eighth lens L8 of a convex-convex type having positive power, a ninth lens L9 of a concave-concave type having negative power or a convex-concave type having positive power, a tenth lens L10 of a convex-convex type having positive power or a concave-concave type having negative power, an eleventh lens L11 of a concave-convex type having negative power or a convex-convex type having positive power, a twelfth lens L12 of a concave-convex type having positive power or negative power, and a thirteenth lens L13 of a concave-convex type having positive power. The ninth lens element L9, the tenth lens element L10 and the eleventh lens element L11 are combined into a cemented lens assembly, or the tenth lens element L10, the eleventh lens element L11 and the twelfth lens element L12 are combined into a cemented lens assembly. Of course, according to the above concept of the present invention, in some embodiments, the second fixed group G3 may further include, in order from the object side to the image side, an eighth lens L8 of a convex-convex type having positive optical power, a ninth lens L9 of a concave-concave type having negative optical power, a tenth lens L10 of a convex-convex type having positive optical power, an eleventh lens L11 of a concave-convex type having negative optical power, a twelfth lens L12 of a concave-convex type having positive optical power, a thirteenth lens L13 of a concave-concave type having negative optical power, and a fourteenth lens L14 of a convex-convex type having positive optical power. The ninth lens element L9, the tenth lens element L10 and the eleventh lens element L11 are combined into a cemented lens assembly, and the thirteenth lens element L13 and the fourteenth lens element L14 are combined into a cemented lens assembly.
The focusing group G4 includes a fourteenth lens L14 of a convex-concave type having negative power, a fifteenth lens L15 of a convex-convex type having positive power, a sixteenth lens L16 of a convex-convex type having positive power, and a seventeenth lens L17 of a concave-convex type having negative power, which are arranged in order from the object side to the image side. The fourteenth lens element L14 and the fifteenth lens element L15 are combined together to form a cemented lens assembly, and the sixteenth lens element L16 and the seventeenth lens element L17 are combined together to form a cemented lens assembly. Of course, according to the above concept of the present invention, in some embodiments, the focusing group G4 may further include a fifteenth lens L15 of a concave type having a negative optical power, a sixteenth lens L16 of a convex type having a positive optical power, and a seventeenth lens L17 of a convex type having a positive optical power, which are arranged in order from the object side to the image side. The fifteenth lens element L15 and the sixteenth lens element L16 are combined into a cemented lens assembly.
In summary, the second fixed group G3 and the focusing group G4 have various embodiments according to the composition of the lenses, the lens structure, and the power, but the total number of lenses in the optical system is not changed, and the difference is that the lens group of the fourteenth lens L14 is different. The optical system can realize high and low temperature confocal without virtual focus and visible light and infrared light confocal by meeting the setting.
The utility model discloses in, optical system 1's wide-angle end focal length fw and telescope end focal length ft satisfy following relation: ft/fw is not less than 3. The wide-angle end focal length fw of the optical system 1 and the distance TLw from the object side surface of the first lens to the image side surface of the last lens at the wide-angle end satisfy the following relationship: fw/TLw is more than or equal to 0.1. The optical system can realize the characteristics of small volume and short total length by meeting the relation.
The utility model discloses in, optical system 1's wide-angle end focus fw satisfies following relation with focus f1 of first fixed group G1, focus f2 of group G2 zooms, focus f3 of the fixed group G3 of second and focus f4 of group G4 respectively: f1/fw is less than or equal to 6.5; f2/fw is less than or equal to-1.5; f3/fw is less than or equal to 4.5; f4/fw is less than or equal to 4.5. The optical system has the advantages that the relation is met, the tolerance of the optical system is good, the light trend is stable, and the assembly precision is higher.
The utility model discloses in, zoom group G2 from the tele end to the shift distance D1 of telephoto end and focus group G4 from the tele end to the shift distance D2 of telephoto end respectively with the first piece of lens object side of wide-angle end to the distance TLw of last piece of lens image side satisfy following relation: | D1/TLw | ≦ 0.35; | D2/TLw | ≦ 0.1. The optical system can move the group more conveniently and quickly when zooming, has high sensitivity, and has small volume and short total length.
The utility model discloses in, the focus Fa of the cemented mirror group in the first fixed group G1 and the focus f1 of first fixed group G1, the focus Fb of the cemented mirror group in the group G2 and the focus f2 of the group G2 that zooms satisfy the following relation respectively: fa/f1 is more than or equal to 3.5; fb/f2 is not less than-4.5. The focal length Fc of the cemented lens group in the second fixed group G3 and the focal length f3 of the second fixed group G3 satisfy the following relationship: 1.5-2.5 of Fc/f 3. The wide-angle end focal length fw of the optical system 1 and the focal length Fd of the cemented lens group in the focusing group G4 satisfy the following relationship: fd/fw is more than or equal to-12 and less than or equal to 1.5. Satisfying the above relationship is advantageous for correcting chromatic aberration, so that the sensitivity of system tolerance is low.
The utility model discloses in, in the fixed group G3 of second and the group G4 of focusing, the abbe number VD of an at least lens satisfies following condition: VD is more than or equal to 65. Satisfying this condition is favorable to the aberration of the infrared part of correction system for the system satisfies the confocal of visible light and infrared light.
The optical system of the present invention will be specifically described below in three embodiments. In the following embodiments, the surfaces of the lenses are denoted by S1, S2, …, and SN, where the STOP is denoted as STOP and the adhesive surface is denoted as one surface. The parameters of each embodiment specifically satisfying the above conditional expressions are shown in table 1 below:
TABLE 1
First embodiment
Referring to fig. 1, in the present embodiment, the second lens L2 is a convex lens, the second fixed group G3 includes six lenses, and the focusing group G4 includes four lenses.
In the second fixed group G3, the ninth lens L9 is a concave-concave type lens having negative optical power, the tenth lens L10 is a convex-convex type lens having positive optical power, the eleventh lens L11 is a concave-convex type lens having negative optical power, and the twelfth lens L12 is a lens having positive optical power. The ninth lens element L9, the tenth lens element L10 and the eleventh lens element L11 are combined into a triple cemented lens assembly.
The focusing group G4 includes a fourteenth lens L14 of a convex-concave type having negative power, a fifteenth lens L15 of a convex-convex type having positive power, a sixteenth lens L16 of a convex-convex type having positive power, and a seventeenth lens L17 of a concave-convex type having negative power, which are arranged in order from the object side to the image side. The fourteenth lens element L14 and the fifteenth lens element L15 are combined together to form a cemented lens assembly, and the sixteenth lens element L16 and the seventeenth lens element L17 are combined together to form a cemented lens assembly.
The parameters related to the lens of the optical system in this embodiment include surface type, R value, thickness, refractive index, and abbe number, as shown in table 2 below:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 109.0 | 1.5 | 1.81 | 25.5 |
| S2 | Spherical surface | 55.0 | 6 | 1.50 | 81.6 |
| S3 | Spherical surface | -262.0 | 0.1 | ||
| S4 | Spherical surface | 39.0 | 4.9 | 1.62 | 63.9 |
| S5 | Spherical surface | 135.0 | Variable | ||
| S6 | Spherical surface | 167.0 | 1 | 1.59 | 68.6 |
| S7 | Spherical surface | 22.0 | 2.4 | ||
| S8 | Spherical surface | -48.0 | 1 | 1.59 | 68.9 |
| S9 | Spherical surface | 16.0 | 4.4 | ||
| S10 | Spherical surface | -36.0 | 0.8 | 1.49 | 70.4 |
| S11 | Spherical surface | 19.0 | 3.7 | 1.79 | 44.2 |
| S12 | Spherical surface | -58.0 | Variable | ||
| Stop | Spherical surface | Infinity | 2.7 | ||
| S14 | Spherical surface | 45.0 | 3 | 1.83 | 37.2 |
| S15 | Spherical surface | -433.0 | 8.1 | ||
| S16 | Spherical surface | -19.7 | 2 | 1.70 | 56.2 |
| S17 | Spherical surface | 41.0 | 5.7 | 1.46 | 90.2 |
| S18 | Spherical surface | -13.0 | 1 | 1.65 | 39.5 |
| S19 | Spherical surface | -31.0 | 0.1 | ||
| S20 | Spherical surface | -80.0 | 3 | 2.00 | 19.3 |
| S21 | Spherical surface | -48.0 | 0.1 | ||
| S22 | Spherical surface | -2292.0 | 3.2 | 1.68 | 55.6 |
| S23 | Spherical surface | -29.1 | Variable | ||
| S24 | Spherical surface | 109.0 | 0.8 | 1.90 | 31.3 |
| S25 | Spherical surface | 22.0 | 4.1 | 1.46 | 90.2 |
| S26 | Spherical surface | -53.0 | 0.1 | ||
| S27 | Spherical surface | 22.5 | 4.1 | 1.59 | 68.6 |
| S28 | Spherical surface | -75.0 | 1 | 1.75 | 35.0 |
| S29 | Spherical surface | -317.0 | Variable |
TABLE 2
Second embodiment
Referring to fig. 2, in the present embodiment, the second lens L2 is a concave-convex lens, the second fixed group G3 includes six lenses, and the focusing group G4 includes four lenses.
In the second fixed group G3, the ninth lens L9 is a convex-concave type lens having positive optical power, the tenth lens L10 is a concave-concave type lens having negative optical power, the eleventh lens L11 is a convex-convex type lens having positive optical power, and the twelfth lens L12 is a lens having negative optical power. The tenth lens element L10, the eleventh lens element L11 and the twelfth lens element L12 are combined into a third cemented lens assembly.
The focusing group G4 includes a fourteenth lens L14 of a convex-concave type having negative power, a fifteenth lens L15 of a convex-convex type having positive power, a sixteenth lens L16 of a convex-convex type having positive power, and a seventeenth lens L17 of a concave-convex type having negative power, which are arranged in order from the object side to the image side. The fourteenth lens element L14 and the fifteenth lens element L15 are combined together to form a cemented lens assembly, and the sixteenth lens element L16 and the seventeenth lens element L17 are combined together to form a cemented lens assembly.
The parameters related to the lens of the optical system in this embodiment include surface type, R value, thickness, refractive index, and abbe number, as shown in table 3 below:
TABLE 3
Third embodiment
Referring to fig. 3, in the present embodiment, the second lens L2 is a concave-convex lens, the second fixed group G3 includes seven lenses, and the focusing group includes three lenses.
In the second fixed group G3, the eighth lens L8 is a convex-convex lens having positive refractive power, the ninth lens L9 is a concave-concave lens having negative refractive power, the tenth lens L10 is a convex-convex lens having positive refractive power, the eleventh lens L11 is a concave-convex lens having negative refractive power, the twelfth lens L12 is a concave-convex lens having positive refractive power, the thirteenth lens L13 is a concave-concave lens having negative refractive power, and the fourteenth lens L14 is a convex-convex lens having positive refractive power. The ninth lens element L9, the tenth lens element L10 and the eleventh lens element L11 are combined into a triple cemented lens assembly, and the thirteenth lens element L13 and the fourteenth lens element L14 are combined into a double cemented lens assembly.
In the focusing group G4, the fifteenth lens L15 is a concave-concave type lens having a negative refractive power, the sixteenth lens L16 is a convex-convex type lens having a positive refractive power, and the seventeenth lens L17 is a convex-convex type lens having a positive refractive power. The fifteenth lens element L15 and the sixteenth lens element L16 are cemented together to form a double cemented lens assembly.
The parameters related to the lens of the optical system in the present embodiment include surface type, R value, thickness, refractive index, and abbe number, as shown in table 4 below:
| number of noodles | Surface type | R value | Thickness of | Refractive index | Abbe number |
| S1 | Spherical surface | 66 | 1.5 | 1.81 | 25.5 |
| S2 | Spherical surface | 42 | 5.9 | 1.5 | 81.6 |
| S3 | Spherical surface | 403 | 0.1 | ||
| S4 | Spherical surface | 41 | 4.8 | 1.62 | 63.9 |
| S5 | Spherical surface | 188 | Variable | ||
| S6 | Spherical surface | 123 | 1 | 1.59 | 68.6 |
| S7 | Spherical surface | 19.5 | 2.5 | ||
| S8 | Spherical surface | -49 | 1 | 1.59 | 68.6 |
| S9 | Spherical surface | 16 | 4.6 | ||
| S10 | Spherical surface | -62 | 1 | 1.49 | 70.4 |
| S11 | Spherical surface | 18.5 | 3 | 1.80 | 39.6 |
| S12 | Spherical surface | -145 | Variable | ||
| Stop | Spherical surface | Infinity | 3.1 | ||
| S14 | Spherical surface | 47 | 3.6 | 1.79 | 44.2 |
| S15 | Spherical surface | -117 | 5 | ||
| S16 | Spherical surface | -31 | 1.5 | 1.61 | 44.2 |
| S17 | Spherical surface | 15 | 5.8 | 1.46 | 90.2 |
| S18 | Spherical surface | -11.7 | 1 | 1.61 | 44.2 |
| S19 | Spherical surface | -34.4 | 0.1 | ||
| S20 | Spherical surface | -275 | 3.3 | 2 | 19.3 |
| S21 | Spherical surface | -45.8 | 0.7 | ||
| S22 | Spherical surface | -26 | 1 | 1.55 | 63.4 |
| S23 | Spherical surface | 23 | 5.3 | 1.67 | 47.2 |
| S24 | Spherical surface | -26.3 | Variable | ||
| S25 | Spherical surface | -890 | 0.8 | 1.81 | 25.5 |
| S26 | Spherical surface | 21.6 | 4.4 | 1.46 | 90.2 |
| S27 | Spherical surface | -37 | 0.1 | ||
| S28 | Spherical surface | 23.7 | 3.3 | 1.59 | 68.6 |
| S29 | Spherical surface | -356 | Variable |
TABLE 4
Referring to fig. 4, the zoom lens of the present invention, in addition to the optical system of the present invention, further includes a cylindrical beam splitter 2 located on the image side of the optical system 1. An object side surface 2-1 of the cylindrical spectroscope 2 is a plane, an image side surface 2-2 is a cylindrical surface with an inclination angle of 0-2 degrees with an object side surface, the object side surface of the cylindrical spectroscope 2 is plated with a spectroscopic film system, and the thickness of the cylindrical spectroscope 2 is less than 3 mm. The image side cylindrical surface of the cylindrical beam splitter 2 may be a spherical cylindrical surface, or an aspherical cylindrical surface, and may be a concave surface or a convex surface. The optical axis of the cylindrical beam splitter 2 is perpendicular to the object-side plane and passes through the center of the object-side plane, the central optical axis of the cylindrical beam splitter 2 and the optical axis of the optical system 1 are mutually inclined, and the inclination angle is 30-50 degrees; the intersection point of the optical axis of the cylindrical beam splitter 2 and the object side plane coincides with the optical axis of the optical system 1 or deviates from the optical axis of the optical system 1 by 0-5 mm. Thus, the cylindrical spectroscope 2 can enable the optical system 1 to perform double Sensor imaging, and the two opposite surfaces have inclination angles so as to reduce the aberration influence caused by the inclined placement of the cylindrical spectroscope.
Referring to fig. 5, the zoom lens of the present invention further includes a compensation device 3 located on the image side of the cylindrical beam splitter 2, the compensation device 3 in this embodiment is a compensation mirror, the object side 3-1 is a plane, and the image side 3-2 is a plane or a curved surface (which may be collectively referred to as an inclined plane having a certain inclination angle with the object side plane) having an inclination angle of 0-2 degrees. Therefore, the compensation mirror can further reduce the influence of system aberration brought by the cylindrical beam splitter.
Therefore, the utility model discloses a zoom lens is equivalent to and places cylinder spectroscope 2 at 1 image side slope of (former) optical system, and when the emergent light of 1 last piece of lens of optical system passed through the coating film plane of cylinder spectroscope 2, falls into two bundles of light of visible light and non-visible light with light, makes optical system 1 can carry out visible light and non-visible light formation of image simultaneously, and the transmitted light can carry out the aberration correction when the cylinder of cylinder spectroscope 2. And, there is a compensating device 3 near the image side of the optical system 1 for further correcting aberration, and the imaging pictures of the two imaging planes are processed to synthesize the imaging result with the most reducibility to the object.
To sum up, the optical system and the zoom lens of the present invention can work normally in the temperature variation range of-40 ℃ to +80 ℃, and can realize the confocal of visible light and infrared light. Moreover, the tolerance is good and the yield is high. The FNO of the system is less than or equal to 1.8, namely the system belongs to a large-aperture imaging system and can carry out normal clear imaging in a dark environment. The utility model discloses a but chip of 800 ten thousand pixels of zoom lens adaptation satisfies 4K resolution ratio to greatly improve image resolving power. The spectroscope device added at the rear end of the optical system can perform simultaneous imaging of two sensors, and a more real picture is restored through image processing.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (23)
1. An optical system (1) comprising a first fixed group (G1) with positive focal power, a zoom group (G2) with negative focal power, a STOP (STOP), a second fixed group (G3) with positive focal power and a focus group (G4) with positive focal power, which are arranged in order from an object side to an image side along an optical axis, wherein the zoom group (G2) and the focus group (G4) are movable along the optical axis, characterized in that the first fixed group (G1) comprises three lenses, the zoom group (G2) comprises four lenses, the second fixed group (G3) comprises six or seven lenses, and the focus group (G4) comprises four or three lenses.
2. The optical system (1) according to claim 1, characterized in that the first fixed group (G1) comprises, in order from the object side to the image side, a first lens (L1) of the convex-concave type having negative optical power, a second lens (L2) of the convex-convex or convex-concave type having positive optical power, and a third lens (L3) of the convex-concave type having positive optical power.
3. The optical system (1) according to claim 2, characterized in that said first lens (L1) is cemented with said second lens (L2) to constitute a cemented lens group.
4. The optical system (1) according to claim 3, characterized in that the zoom group (G2) comprises, in order from the object side to the image side, a fourth lens (L4) of the convex-concave type having a negative optical power, a fifth lens (L5) of the concave-concave type having a negative optical power, a sixth lens (L6) of the concave-concave type having a negative optical power, and a seventh lens (L7) of the convex-convex type having a positive optical power.
5. The optical system (1) according to claim 4, characterized in that the sixth lens (L6) is cemented with the seventh lens (L7) to constitute a cemented lens group.
6. The optical system (1) according to claim 1, characterized in that the second fixed group (G3) comprises, in order from the object side to the image side, an eighth lens (L8) of convex-convex type with positive optical power, a ninth lens (L9) of concave-concave type with negative optical power or convex-concave type with positive optical power, a tenth lens (L10) of convex-convex type with positive optical power or concave-concave type with negative optical power, an eleventh lens (L11) of concave-convex type with negative optical power or convex-convex type with positive optical power, a twelfth lens (L12) of concave-convex type with positive optical power or negative optical power, and a thirteenth lens (L13) of concave-convex type with positive optical power.
7. The optical system (1) according to claim 6, wherein the ninth lens (L9), the tenth lens (L10) and the eleventh lens (L11) are cemented to form a cemented lens group, or the tenth lens (L10), the eleventh lens (L11) and the twelfth lens (L12) are cemented to form a cemented lens group.
8. The optical system (1) according to claim 6, wherein the focusing group (G4) comprises, in order from the object side to the image side, a fourteenth lens (L14) of the convex-concave type having negative optical power, a fifteenth lens (L15) of the convex-convex type having positive optical power, a sixteenth lens (L16) of the convex-convex type having positive optical power, and a seventeenth lens (L17) of the concave-convex type having negative optical power.
9. The optical system (1) according to claim 8, wherein the fourteenth lens (L14) is cemented with the fifteenth lens (L15) to form a cemented lens group, and the sixteenth lens (L16) is cemented with the seventeenth lens (L17) to form a cemented lens group.
10. The optical system (1) according to claim 1, characterized in that the second fixed group (G3) comprises, in order from the object side to the image side, an eighth lens (L8) of convex-convex type having positive optical power, a ninth lens (L9) of concave-concave type having negative optical power, a tenth lens (L10) of convex-convex type having positive optical power, an eleventh lens (L11) of concave-convex type having negative optical power, a twelfth lens (L12) of concave-convex type having positive optical power, a thirteenth lens (L13) of concave-concave type having negative optical power, and a fourteenth lens (L14) of convex-convex type having positive optical power.
11. The optical system (1) according to claim 10, wherein the ninth lens (L9), the tenth lens (L10) and the eleventh lens (L11) are cemented to form a cemented lens group, and the thirteenth lens (L13) and the fourteenth lens (L14) are cemented to form a cemented lens group.
12. The optical system (1) according to claim 10, wherein the focusing group (G4) comprises, in order from the object side to the image side, a fifteenth lens (L15) of the concave-concave type having a negative optical power, a sixteenth lens (L16) of the convex-convex type having a positive optical power, and a seventeenth lens (L17) of the convex-convex type having a positive optical power.
13. The optical system (1) according to claim 12, wherein the fifteenth lens (L15) is cemented with the sixteenth lens (L16) to form a cemented lens group.
14. The optical system (1) according to any one of claims 1-13, wherein the wide-angle end focal length fw and the telephoto end focal length ft of the optical system (1) satisfy the following relationship: ft/fw is not less than 3.
15. The optical system (1) according to any one of claims 1 to 13, wherein the wide-angle end focal length fw and the wide-angle end first lens object side to last lens image side distance TLw of the optical system (1) satisfy the following relationship: fw/TLw is more than or equal to 0.1.
16. The optical system (1) according to any one of claims 1-13, wherein the wide-angle end focal length fw of the optical system (1) satisfies the following relationships with the focal length f1 of the first fixed group (G1), the focal length f2 of the zoom group (G2), the focal length f3 of the second fixed group (G3) and the focal length f4 of the focus group (G4), respectively: f1/fw is less than or equal to 6.5; f2/fw is less than or equal to-1.5; f3/fw is less than or equal to 4.5; f4/fw is less than or equal to 4.5.
17. The optical system (1) according to any one of claims 1-13, wherein a moving distance D1 of the zoom group (G2) from the telephoto end to the telephoto end and a moving distance D2 of the focus group (G4) from the telephoto end to the telephoto end, respectively, and a distance TLw from an object side surface of a first lens to an image side surface of a last lens at the wide-angle end satisfy the following relationships: | D1/TLw | ≦ 0.35; | D2/TLw | ≦ 0.1.
18. The optical system (1) according to claim 4, wherein the focal length Fa of the cemented lens group in the first fixed group (G1) and the focal length f1 of the first fixed group (G1), the focal length Fb of the cemented lens group in the zoom group (G2) and the focal length f2 of the zoom group (G2) satisfy the following relationships, respectively: fa/f1 is more than or equal to 3.5; fb/f2 is not less than-4.5.
19. The optical system (1) according to claim 7 or 11, characterized in that the focal length Fc of the set of cemented lenses in the second fixed group (G3) and the focal length f3 of the second fixed group (G3) satisfy the following relationship: 1.5-2.5 of Fc/f 3.
20. The optical system (1) according to claim 9 or 13, wherein the wide-angle end focal length fw of the optical system (1) and the focal length Fd of the cemented lens group in the focusing group (G4) satisfy the following relationship: fd/fw is more than or equal to-12 and less than or equal to 1.5.
21. The optical system (1) according to any one of claims 1 to 13, wherein in the second fixed group (G3) and the focusing group (G4), the abbe number VD of at least one lens satisfies the following condition: VD is more than or equal to 65.
22. A zoom lens using the optical system (1) according to any one of claims 1 to 13, characterized by further comprising a cylindrical beam splitter (2) located on the image side of the optical system (1);
the object side surface of the cylindrical spectroscope (2) is a plane, and the image side surface is a cylindrical surface with an inclination angle of 0-2 degrees with the object side surface;
the object side surface of the cylindrical spectroscope (2) is plated with a spectroscopic film system, and the thickness of the cylindrical spectroscope (2) is less than 3 mm;
the image side surface of the cylindrical spectroscope (2) is a spherical cylindrical surface or an aspheric cylindrical surface and is a convex surface or a concave surface;
the optical axis of the cylindrical spectroscope (2) is perpendicular to the object side surface and passes through the center of the object side surface, the optical axis of the cylindrical spectroscope (2) and the optical axis of the optical system (1) are mutually inclined, and the inclination angle is 30-50 degrees;
the intersection point of the optical axis of the cylindrical spectroscope (2) and the object side surface is coincident with the optical axis of the optical system (1) or deviates from the optical axis of the optical system (1) by 0-5 mm.
23. A zoom lens according to claim 22, further comprising compensation means (3) located on the image side of the cylindrical beam splitter (2);
the compensation device (3) is a compensation mirror, the object side surface is a plane, and the image side surface is a plane or a curved surface with an inclination angle of 0-2 degrees with the object side surface.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253441A (en) * | 2021-06-09 | 2021-08-13 | 舜宇光学(中山)有限公司 | Optical system and zoom lens |
| CN114355595A (en) * | 2021-12-31 | 2022-04-15 | 福建福光股份有限公司 | Super-clean large-area array day and night dual-purpose zoom lens |
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2021
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113253441A (en) * | 2021-06-09 | 2021-08-13 | 舜宇光学(中山)有限公司 | Optical system and zoom lens |
| CN114355595A (en) * | 2021-12-31 | 2022-04-15 | 福建福光股份有限公司 | Super-clean large-area array day and night dual-purpose zoom lens |
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