CN109100858B - Three-time imaging medium wave infrared continuous zoom lens and imaging method - Google Patents
Three-time imaging medium wave infrared continuous zoom lens and imaging method Download PDFInfo
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- CN109100858B CN109100858B CN201811242575.9A CN201811242575A CN109100858B CN 109100858 B CN109100858 B CN 109100858B CN 201811242575 A CN201811242575 A CN 201811242575A CN 109100858 B CN109100858 B CN 109100858B
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- 238000003384 imaging method Methods 0.000 title claims abstract description 63
- 230000005499 meniscus Effects 0.000 claims abstract description 24
- 230000003287 optical effect Effects 0.000 claims description 18
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 8
- 229910052710 silicon Inorganic materials 0.000 claims description 8
- 239000010703 silicon Substances 0.000 claims description 8
- 229910052732 germanium Inorganic materials 0.000 claims description 4
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims 1
- 238000003825 pressing Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 6
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- 238000009434 installation Methods 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 238000005096 rolling process Methods 0.000 description 3
- 125000006850 spacer group Chemical group 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- 241001330002 Bambuseae Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
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- 239000003921 oil Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B15/00—Optical objectives with means for varying the magnification
- G02B15/14—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective
- G02B15/16—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group
- G02B15/163—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group
- G02B15/167—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses
- G02B15/173—Optical objectives with means for varying the magnification by axial movement of one or more lenses or groups of lenses relative to the image plane for continuously varying the equivalent focal length of the objective with interdependent non-linearly related movements between one lens or lens group, and another lens or lens group having a first movable lens or lens group and a second movable lens or lens group, both in front of a fixed lens or lens group having an additional fixed front lens or group of lenses arranged +-+
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Abstract
The invention relates to a three-time imaging medium wave infrared continuous zoom lens and an imaging method, wherein the imaging medium wave infrared continuous zoom lens comprises a lens barrel, and a front fixed group, a zoom group, a compensation group, a focusing group, a secondary imaging group and a three-time imaging group are sequentially arranged in the lens barrel along the incident direction of light rays; the front fixed group is a positive meniscus lens A, the variable magnification group is a biconcave negative lens B, the compensation group is a biconvex lens C, the focusing group is a negative meniscus lens D, the secondary imaging group comprises a biconvex positive lens E1, a plano-concave negative lens E2, a biconvex positive lens E3 and a biconcave negative lens E4 which are sequentially arranged, the tertiary imaging group comprises a biconvex positive lens F1, a biconcave negative lens F2 and a biconcave positive lens F3 which are sequentially arranged, a reflecting mirror A is arranged between the plano-concave negative lens E2 and the biconcave positive lens E3, and a reflecting mirror B is arranged between the biconcave negative lens E4 and the biconvex positive lens F1.
Description
Technical Field
The invention relates to a three-time imaging medium wave infrared continuous zoom lens and an imaging method.
Background
With the continuous increase of commercial and civil security monitoring demands, the application of infrared thermal imaging technology in the security field has been rapidly developed from point source infrared detection alarm to infrared staring focal plane imaging. Based on the information, the intelligent video monitoring alarm system integrating infrared light and visible light is rapidly developed and widely applied to important departments such as border coastal defense, airports, oil depots, ordnance depots, cultural relics, prisons and the like, as well as traffic, industry, storage, port wharfs, internet of things, forest fire prevention and the like. The infrared continuous zoom lens has the characteristics that the focal length can be continuously changed, and target information cannot be lost in the zooming process, so that the demand of people for high-performance infrared continuous zoom optical systems is increasingly increased. However, the existing infrared continuous zoom lens has the disadvantages of larger size, single structural form, poor imaging quality, limited searching and identifying capability for infrared targets and limited application in the field of multispectral fusion.
Disclosure of Invention
In view of the defects in the prior art, the technical problem to be solved by the invention is to provide a three-time imaging medium-wave infrared continuous zoom lens and an imaging method.
In order to solve the technical problems, the technical scheme of the invention is as follows: the infrared continuous zoom lens for the three-time imaging medium wave comprises a lens barrel, wherein a lens is arranged in the lens barrel, and the lens consists of a front fixed group, a variable-magnification group, a compensation group, a focusing group, a secondary imaging group and a three-time imaging group which are sequentially arranged along the incidence direction of light rays from left to right; the front fixed group is a positive meniscus lens A, the variable magnification group is a biconcave negative lens B, the compensation group is a biconvex lens C, the focusing group is a negative meniscus lens D, the secondary imaging group is composed of a biconvex positive lens E1, a plano-concave negative lens E2, a biconvex positive lens E3 and a biconcave negative lens E4 which are sequentially arranged, the tertiary imaging group is composed of a biconvex positive lens F1, a biconcave negative lens F2 and a biconvex positive lens F3 which are sequentially arranged, a reflecting mirror A is arranged between the plano-concave negative lens E2 and the biconvex positive lens E3, and a reflecting mirror B is arranged between the biconcave negative lens E4 and the biconvex positive lens F1.
Further, the air interval between the front fixed group and the variable-magnification group is 9.09-25.18 mm, the air interval between the variable-magnification group and the compensation group is 46.45-15.18 mm, the air interval between the compensation group C and the focusing group E is 5.00-20.18 mm, the air interval between the biconvex positive lens E1 and the plano-concave negative lens E2 is 0.50mm, the air interval between the plano-concave negative lens E2 and the biconvex positive lens E3 is 127.87mm, the air interval between the biconvex positive lens E3 and the biconvex negative lens E4 is 2.02mm, the air interval between the biconvex positive lens F1 and the biconvex negative lens F2 is 7.28mm, and the air interval between the biconvex negative lens F2 and the biconvex positive lens F3 is 1.00mm.
Furthermore, the lens adopts 11 lenses, and the lenses are respectively silicon, germanium, silicon, germanium and silicon according to the material sequence.
Further, the image side of the biconcave negative lens B, the image side of the negative meniscus lens D, the object side of the biconvex positive lens E1, the image side of the biconcave negative lens E4, the image side of the biconvex positive lens F, and the object side of the biconvex positive lens F3 are aspheric.
Further, the aspherical surface satisfies the following expression:
wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R representing the paraxial radius of curvature of the mirror; k is a conical coefficient; A. b, C, D is a higher order aspheric coefficient.
Further, the focal power of the front fixed group is positive, the focal power of the variable-magnification group is negative, the focal power of the compensation group is positive, the focal power of the focusing group is negative, the focal power of the secondary imaging group is positive, and the focal power of the tertiary imaging group is positive.
Further, the reflector A and the reflector B are arranged obliquely with the optical axis by 45 degrees, and the reflector A is perpendicular to the reflector B.
An imaging method of a three-time imaging medium-wave infrared continuous zoom lens comprises the following steps: the optical path sequentially enters the positive meniscus lens A, the biconcave negative lens B, the biconvex lens C and the negative meniscus lens D, then sequentially passes through the biconvex positive lens F1, the biconcave negative lens F2, the reflecting mirror A, the biconvex positive lens E3, the biconcave negative lens E4 and the reflecting mirror B, then carries out second imaging, and finally sequentially passes through the biconvex positive lens F1, the biconcave negative lens F2 and the biconvex positive lens F3, and then carries out third imaging.
Compared with the prior art, the invention has the following beneficial effects: the lens has good imaging quality and smooth and steady zooming, and is beneficial to large-scale searching and long-distance identification.
The invention will be described in further detail with reference to the drawings and the detailed description.
Drawings
FIG. 1 is a schematic view of the optical construction of the present lens;
FIG. 2 is a short focal MTF diagram of the present lens;
FIG. 3 is a lens telephoto MTF diagram;
fig. 4 is a diagram of the present lens short focal field Qu Jibian;
fig. 5 is a diagram of the present lens telephoto field Qu Jibian;
FIG. 6 is a schematic view of the lens assembly;
fig. 7 is a schematic view of the mounting structure of the front lens barrel of the present lens;
fig. 8 is a schematic diagram of the mounting structure of the present lens barrel;
fig. 9 is a schematic view of an installation structure of the present lens intermediate barrel;
fig. 10 is a schematic diagram of an installation structure of the lens mirror base a;
FIG. 11 is a schematic view of the mounting structure of the lens barrel;
FIG. 12 is a schematic view of the mounting structure of the lens-reflector base B;
fig. 13 is a schematic view of an installation structure of the rear barrel of the present lens.
In the figure:
a positive meniscus lens A; b-biconcave negative lens B; c-a biconvex lens C; d-a negative meniscus lens D; e1-biconvex positive lens E1; e2-plano-concave negative lens E2; e3-a biconvex positive lens E3; e4-a biconcave negative lens E4; f1—biconvex positive lens F1; f2-a biconcave negative lens F2; f3—biconvex positive lens F3; g-primary image plane; h-secondary image plane; i-cubic image plane; j-mirror A; k-mirror B; 1-front barrel; 2-focusing lens barrel; 3-an intermediate barrel; 4-connecting the bottom plate; 5-a reflector seat A;6, a correction cylinder; 7-a reflector base B; 8-rear barrel; 9-a front fixed group assembly; 10-zooming carriage; 11-balls; 12-cam; 13-compensating carriages; 14-guiding nails; 15-a cam pressing ring; 16-an electric motor; 17-front fixed group adjusting gaskets; 18-focusing seat; 19-exhaust holes; 20-negative meniscus lens D press ring; 21-focusing potentiometer; 22-focusing guide nails; 23-focusing cam; 24-focusing cam pressing ring; 25-focusing motor; 26-middle barrel adjustment shims; 27-a lens barrel; 28-plano-concave negative lens E2 press ring; 29-a spacer between the biconvex positive lens E1 and the plano-concave negative lens E2; 30-a mirror frame; 31-hall element; 32-sector correction plates; 33 magnetic steel-; 34-closing plates; 35-driven wheel; 36-correcting the motor; 37-light holes; 38-a secondary imaging adjustment shim; 39-a spacer between the biconvex positive lens E3 and the biconcave negative lens E4; 40-biconvex positive lens E3 pressing ring; 41-biconvex positive lens F3 press ring; 42-screws; 43-three imaging adjustment shims; 44-spacer between biconcave negative lens F2 and biconvex positive lens F3; 45-spacer between biconvex positive lens F1 and biconcave negative lens F2.
Detailed Description
In order to make the above features and advantages of the present invention more comprehensible, embodiments accompanied with figures are described in detail below.
1-13, the intermediate wave infrared continuous zoom lens for three-time imaging comprises a lens barrel, wherein a lens is arranged in the lens barrel, and the lens consists of a front fixed group, a zoom group, a compensation group, a focusing group, a secondary imaging group and a three-time imaging group which are sequentially arranged along the incidence direction of light rays from left to right; the front fixed group is a positive meniscus lens A, the variable magnification group is a biconcave negative lens B, the compensation group is a biconvex lens C, the focusing group is a negative meniscus lens D, the secondary imaging group is composed of a biconvex positive lens E1, a plano-concave negative lens E2, a biconvex positive lens E3 and a biconcave negative lens E4 which are sequentially arranged, the tertiary imaging group is composed of a biconvex positive lens F1, a biconcave negative lens F2 and a biconvex positive lens F3 which are sequentially arranged, a reflecting mirror A is arranged between the plano-concave negative lens E2 and the biconvex positive lens E3, and a reflecting mirror B is arranged between the biconcave negative lens E4 and the biconvex positive lens F1.
In this embodiment, the air space between the front fixed group and the variable magnification group is 9.09-25.18 mm, the air space between the variable magnification group and the compensation group is 46.45-15.18 mm, the air space between the compensation group C and the focusing group E is 5.00-20.18 mm, the air space between the biconvex positive lens E1 and the plano-concave negative lens E2 is 0.50mm, the air space between the plano-concave negative lens E2 and the biconvex positive lens E3 is 127.87mm, the air space between the biconvex positive lens E3 and the biconvex negative lens E4 is 2.02mm, the air space between the biconvex positive lens F1 and the biconvex negative lens F2 is 7.28mm, and the air space between the biconvex negative lens F2 and the biconvex positive lens F3 is 1.00mm.
In this embodiment, 11 lenses are used, and the lenses are silicon, germanium, silicon, and silicon in the order of materials.
In this implementation, the parameters of each lens are as follows:
in this embodiment, the image side surface of the biconcave negative lens B, the image side surface of the negative meniscus lens D, the object side surface of the biconvex positive lens E1, the image side surface of the biconcave negative lens E4, the image side surface of the biconvex positive lens F, and the object side surface of the biconvex positive lens F3 are aspheric.
In this implementation, the aspherical surface satisfies the following expression:
wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R representing the paraxial radius of curvature of the mirror; k is a conical coefficient; A. b, C, D is a higher order aspheric coefficient.
The aspherical data for each lens is as follows:
| face number | K | A | B | C | D |
| S4 | 0 | -2.64E-005 | -4.518E-008 | 1.258E-010 | 0 |
| S8 | 0 | -6.677E-007 | 4.601E-009 | -2.202E-011 | 2.052E-014 |
| S9 | 0 | -8.093E-007 | -7.144E-011 | 5.381E-013 | -1.116e-15 |
| S16 | 0 | -6.180E-006 | -5.345E-009 | 1.700E-011 | -2.397E-013 |
| S18 | 0 | 1.24E-005 | -1.991E-008 | 1.929E-011 | 3.3023E-014 |
| S21 | 0 | 1.673E-005 | -9.057E-008 | 1.941E-10 | 0 |
An imaging method of a three-time imaging medium-wave infrared continuous zoom lens comprises the following steps: the optical path sequentially enters the positive meniscus lens A, the biconcave negative lens B, the biconvex lens C and the negative meniscus lens D, then sequentially passes through the biconvex positive lens F1, the biconcave negative lens F2, the reflecting mirror A, the biconvex positive lens E3, the biconcave negative lens E4 and the reflecting mirror B, then carries out second imaging, and finally sequentially passes through the biconvex positive lens F1, the biconcave negative lens F2 and the biconvex positive lens F3, and then carries out third imaging.
In this implementation, the focal power of the front fixed group is positive, the focal power of the variable-magnification group is negative, the focal power of the compensation group is positive, the focal power of the focusing group is negative, the focal power of the secondary imaging group is positive, and the focal power of the tertiary imaging group is positive.
In this embodiment, the mirrors a and B are disposed at an angle of 45 ° to the optical axis, and the mirror a is perpendicular to the mirror B.
The optical structure of the lens consists of six components of a front fixed group with positive focal power, a variable-magnification group with negative focal power, a compensation group with positive focal power, a focusing group with negative focal power, a secondary imaging group with positive focal power and a tertiary imaging group with positive focal power, adopts a tertiary imaging structure and carries out 90-degree turn on an optical path twice, realizes a long and compact appearance structure, has the advantages of flexible structure, turn-over optical path, continuous zooming and the like, and can realize the functions of electric continuous zooming, electric focusing, focal length real-time feedback, image real-time output and the like.
The lower optical index of the lens is as follows:
(1) Focal length: f' =20-180 mm, the transformation ratio is 9 times;
(2) Field angle range: 34.17-3.91 degrees;
(3) Relative pore size: 1:4;
(4) Adapting the detector: the high-resolution refrigeration type medium wave infrared detector is suitable for a high-resolution refrigeration type medium wave infrared detector with 640 x 512 target surfaces and 15um pixel sizes;
(5) Operating temperature: -40 to +70 ℃;
(6) The volume of the optical path system is less than 48mm (wide) ×200mm (high) ×285 (long);
(7) The normal temperature time is less than or equal to 5s, and the low temperature time is less than or equal to 8s;
(8) External dimensions: and is less than or equal to 305X 146X 110mm (length X width X height).
In this embodiment, the lens barrel is mounted on the connection base plate, and the lens barrel includes a front lens barrel, a focusing lens barrel, a middle lens barrel, a reflecting lens base a, a correction barrel, a reflecting lens base B, and a rear lens barrel which are sequentially connected, a positive meniscus lens a, a biconcave negative lens B, and a biconvex lens C are sequentially disposed in the front lens barrel, a negative meniscus lens D is disposed in the focusing lens barrel, a biconvex positive lens E1 and a plano-concave negative lens E2 are disposed in the middle lens barrel, a reflecting lens a is disposed in the reflecting lens base a, a biconvex positive lens E3, a biconcave negative lens E4, and a reflecting lens B are sequentially disposed in the reflecting lens base B, and a biconvex positive lens F1, a biconcave negative lens F2, and a biconvex positive lens F3 are sequentially disposed in the rear lens barrel.
In this embodiment, be provided with the shrouding in the correction section of thick bamboo, be provided with the light hole on the shrouding, be provided with the fan-shaped correction board of switching light hole in light hole side on the shrouding, be provided with correction motor in the correction section of thick bamboo, the arc end of fan-shaped correction board is provided with gear portion, be provided with the action wheel on the output shaft of correction motor, be provided with the follow driving wheel on the shrouding, follow driving wheel respectively with gear portion, action wheel meshing transmission, be provided with hall element on two extreme positions of fan-shaped correction board on the shrouding, one extreme position is the position that fan-shaped correction board opened the light hole completely, wherein another extreme position is the position that fan-shaped correction board closed the light hole completely, the both sides of fan-shaped correction board are provided with hall element matched with magnet steel, hall element received the magnetic signal when light hole is full-open, full-closure carries out the position feedback.
In this embodiment, the input end of the reflector base B is provided with a secondary imaging adjustment gasket, so that the interval between the plano-concave negative lens E2 and the biconvex positive lens E3 can be conveniently adjusted, and the input end of the rear lens barrel is provided with a tertiary imaging adjustment gasket, so that the interval between the biconcave negative lens E4 and the biconvex positive lens F1 can be conveniently adjusted.
In this embodiment, spacer rings are disposed between the biconvex positive lens F1 and the biconcave negative lens F2, and between the biconcave negative lens F2 and the biconvex positive lens F3, and a rear pressing ring for fixing the biconvex positive lens F3 is disposed at the output end of the rear barrel.
In this embodiment, the focusing lens barrel is installed on the focusing seat, the focusing seat is connected with the front lens barrel, the focusing seat is provided with a focusing cam capable of rotating relative to the focusing seat, the periphery of the focusing cam is provided with a focusing gear ring, the focusing seat is provided with a focusing motor and a focusing potentiometer, the shaft of the focusing motor and the focusing potentiometer is provided with a gear meshed with the focusing gear ring, the focusing cam is sleeved outside the focusing lens barrel, the focusing lens barrel is externally provided with a focusing guide groove, the focusing cam is provided with a focusing guide nail, and the focusing guide nail stretches into the focusing guide groove. When the focusing motor drives the focusing cam to rotate, the focusing cam transmits motion to the focusing lens barrel provided with the negative meniscus lens D through the focusing guide pin, and the focusing lens barrel converts rotation motion of the focusing cam into parallel movement of the focusing lens barrel along the optical axis direction under the action of the guide straight groove, so that focusing is realized. The vent holes are formed in the focusing lens barrel, so that the situation that the focusing lens barrel cannot be driven to move due to extrusion of internal air when the focusing lens barrel moves forwards and backwards is avoided, and smooth focusing and no clamping stagnation are ensured.
In this embodiment, positive meniscus lens A sets up the input at the front barrel, set gradually zoom balladeur train, compensation balladeur train in the front barrel, biconcave negative lens B installs on the zoom balladeur train, biconvex lens C installs on the compensation balladeur train, the front barrel overcoat is equipped with the cam, the cam periphery is provided with the ring gear, be provided with motor, potentiometer on front barrel or the focusing seat, be provided with on the axle of motor, potentiometer with the gear of ring gear meshing transmission, zoom balladeur train, compensation balladeur train periphery all is provided with the guide way, be provided with the guide pin on the cam, the guide pin stretches into in the guide way. The rolling balls are arranged between the two ends of the cam and the front lens barrel, the cam pressing ring is arranged on the rear side of the cam, the cam pressing ring is arranged on the periphery of the front lens barrel, and the cam rotates without gaps under the action of the rolling balls and the cam pressing ring, so that the sliding friction is converted into rolling friction, and the output torque of the motor is effectively reduced. When the motor drives the cam to rotate, the cam transmits the motion to the zoom sliding frame and the compensation sliding frame through the guide nails, and the zoom sliding frame and the compensation sliding frame convert the rotation motion of the cam into the parallel motion of the sliding frame along the optical axis direction under the action of the guide grooves, so that the zooming is realized.
The guide groove comprises a zoom curve groove arranged on the zoom carriage and a compensation curve groove arranged on the compensation carriage, and the zoom curve groove and the compensation curve groove ensure the correspondence of zoom and compensation moving points through precision machining, so that the whole course is ensured to be clear in the continuous zooming process. The cam rotates to drive the zoom potentiometer to rotate at the same time, so that the output resistance value is changed, and the focal length feedback function is realized through actually measuring the corresponding value of the focal length and the resistance value.
The front lens cone and the focusing lens cone are both provided with Hall elements, and the Hall elements receive information to make feedback signals to carry out limit position feedback under the action of magnetism of the magnetic steel. The Hall element and the magnetic steel frame of the front lens cone and the focusing lens cone are designed into universal parts, so that the types of parts are reduced, and the installation and the debugging are convenient.
The foregoing description is only of the preferred embodiments of the invention, and all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (7)
1. The utility model provides a three time formation of image medium wave infrared continuous zoom lens which characterized in that: the lens comprises a lens barrel, wherein a lens is arranged in the lens barrel, and the lens consists of a front fixed group, a zoom group, a compensation group, a focusing group, a secondary imaging group and a tertiary imaging group which are sequentially arranged along the incidence direction of light rays from left to right; the front fixed group is a positive meniscus lens A, the variable magnification group is a biconcave negative lens B, the compensation group is a biconvex lens C, the focusing group is a negative meniscus lens D, the secondary imaging group is composed of a biconvex positive lens E1, a plano-concave negative lens E2, a biconvex positive lens E3 and a biconcave negative lens E4 which are sequentially arranged, the tertiary imaging group is composed of a biconvex positive lens F1, a biconcave negative lens F2 and a biconvex positive lens F3 which are sequentially arranged, a reflector A is arranged between the plano-concave negative lens E2 and the biconvex positive lens E3, and a reflector B is arranged between the biconcave negative lens E4 and the biconvex positive lens F1;
the focal power of the front fixed group is positive, the focal power of the variable-power group is negative, the focal power of the compensation group is positive, the focal power of the focusing group is negative, the focal power of the secondary imaging group is positive, and the focal power of the tertiary imaging group is positive.
2. The triple imaging medium wave infrared continuous zoom lens of claim 1, wherein: the air interval between the front fixed group and the variable-magnification group is 9.09-25.18 mm, the air interval between the variable-magnification group and the compensation group is 46.45-15.18 mm, the air interval between the compensation group C and the focusing group E is 5.00-20.18 mm, the air interval between the biconvex positive lens E1 and the plano-concave negative lens E2 is 0.50mm, the air interval between the plano-concave negative lens E2 and the biconvex positive lens E3 is 127.87mm, the air interval between the biconvex positive lens E3 and the biconcave negative lens E4 is 2.02mm, the air interval between the biconvex positive lens F1 and the biconcave negative lens F2 is 7.28mm, and the air interval between the biconcave negative lens F2 and the biconvex positive lens F3 is 1.00mm.
3. The triple imaging medium wave infrared continuous zoom lens of claim 1, wherein: the lens adopts 11 lenses, and the lenses are respectively silicon, germanium and silicon according to the material sequence.
4. The triple imaging medium wave infrared continuous zoom lens of claim 1, wherein: the image side of the biconcave negative lens B, the image side of the negative meniscus lens D, the object side of the biconvex positive lens E1, the image side of the biconcave negative lens E4, the image side of the biconvex positive lens F and the object side of the biconvex positive lens F3 are all aspheric surfaces.
5. The triple imaging medium wave infrared continuous zoom lens of claim 1, wherein: the aspherical surface satisfies the following expression:
wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height r along the optical axis direction; c=1/R, R representing the paraxial radius of curvature of the mirror; k is a conical coefficient; A. b, C, D is a higher order aspheric coefficient.
6. The triple imaging medium wave infrared continuous zoom lens of claim 1, wherein: the reflector A and the reflector B are inclined 45 degrees with the optical axis, and the reflector A is perpendicular to the reflector B.
7. An imaging method of a three-time imaging mid-wave infrared continuous zoom lens, characterized by comprising the three-time imaging mid-wave infrared continuous zoom lens as claimed in any one of claims 1-4, comprising the steps of: the optical path sequentially enters the positive meniscus lens A, the biconcave negative lens B, the biconvex lens C and the negative meniscus lens D, then sequentially passes through the biconvex positive lens F1, the biconcave negative lens F2, the reflecting mirror A, the biconvex positive lens E3, the biconcave negative lens E4 and the reflecting mirror B, then carries out second imaging, and finally sequentially passes through the biconvex positive lens F1, the biconcave negative lens F2 and the biconvex positive lens F3, and then carries out third imaging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| CN102590990A (en) * | 2012-03-30 | 2012-07-18 | 昆明物理研究所 | Three-component medium wave infrared 30x continuous zooming optical system |
| CN205263387U (en) * | 2015-12-14 | 2016-05-25 | 福建福光股份有限公司 | Infrared continuous zooming optical system of compact medium wave and camera lens thereof |
| CN209070214U (en) * | 2018-10-24 | 2019-07-05 | 福建福光股份有限公司 | Medium wave infrared continuous zoom lens are imaged three times |
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| CN102590990A (en) * | 2012-03-30 | 2012-07-18 | 昆明物理研究所 | Three-component medium wave infrared 30x continuous zooming optical system |
| CN205263387U (en) * | 2015-12-14 | 2016-05-25 | 福建福光股份有限公司 | Infrared continuous zooming optical system of compact medium wave and camera lens thereof |
| CN209070214U (en) * | 2018-10-24 | 2019-07-05 | 福建福光股份有限公司 | Medium wave infrared continuous zoom lens are imaged three times |
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