CN114236793B - F22.5-45MM double-view-field infrared focusing lens - Google Patents
F22.5-45MM double-view-field infrared focusing lens Download PDFInfo
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- CN114236793B CN114236793B CN202111523929.9A CN202111523929A CN114236793B CN 114236793 B CN114236793 B CN 114236793B CN 202111523929 A CN202111523929 A CN 202111523929A CN 114236793 B CN114236793 B CN 114236793B
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- 230000003287 optical effect Effects 0.000 claims abstract description 35
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- 229910052732 germanium Inorganic materials 0.000 claims description 5
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 5
- 239000013078 crystal Substances 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 9
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- 239000012216 imaging agent Substances 0.000 abstract description 2
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- G—PHYSICS
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- 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
- G02B15/143—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 having three groups only
- G02B15/1431—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 having three groups only the first group being positive
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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- G—PHYSICS
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- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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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
- G02B15/15—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 compensation by means of only one movement or by means of only linearly related movements, e.g. optical compensation
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Abstract
The invention discloses an F22.5-45MM double-view-field infrared focusing lens. The optical system of the lens consists of a front fixed group, a view field switching mirror and a rear fixed group which are sequentially arranged from front to rear along the optical axis transmission direction; the front fixed group comprises a meniscus positive lens A with a convex surface facing the object; the view field switching mirror comprises a biconcave lens B; the rear fixed group comprises a biconvex lens C and a meniscus positive lens D, wherein the biconvex lens C and the meniscus positive lens D are sequentially arranged along the optical axis transmission direction; the biconcave lens B is movable back and forth in the optical axis transmission direction. The lens has the advantages of simple and compact structure, less lenses and good image plane stability; the optical athermalization compensation mode and the mechanical focusing compensation mode are combined, so that the mode of adjusting only one lens is realized, the focusing of temperature compensation and distance can be finished, and meanwhile, the switching of double fields of view is finished; the imaging agent has good imaging effect at the working temperature of-40 ℃ to 60 ℃; the visual field is switched conveniently, stably and rapidly.
Description
Technical Field
The invention belongs to the technical field of optical lenses, and relates to an F22.5-45MM double-view-field infrared focusing lens.
Background
With the development of scientific technology, infrared imaging technology has been widely used in the fields of national defense, industry, medical treatment, etc. The infrared detection has certain capabilities of penetrating smoke, fog, haze, snow and the like and identifying camouflage, is free from blindness caused by strong light and flash interference, can realize long-distance all-weather observation, and is particularly suitable for target detection at night and under bad weather conditions. The infrared focusing lens can adjust the focusing distance to meet the imaging requirement of the detector, so that the infrared focusing lens is widely applied.
Under a complex environment, the focal length can be influenced by various factors, so that imaging is unclear, and the normal operation of the detector is influenced. For example, the temperature not only can affect the refractive index of the optical material, but also can cause thermal expansion and cold contraction to the lens barrel material, so that the focal power change and the optimal image plane shift, the optical imaging quality is reduced, the image is blurred, the contrast is reduced, and the imaging performance of the lens is finally affected. This makes it necessary to compensate for the temperature, which is usually either optical or mechanical.
In the design of an optical system, although a continuous zooming system can realize continuous clear imaging of a target in the zooming process, the system has complex structure and higher processing and assembling difficulty, so that the transmittance and imaging quality of the system are reduced, and the imaging effect is influenced. In addition, when the system is used for measurement, the visual axis shake may cause the system measurement error to become large. The dual-view-field optical system is simple in structure, has the characteristics of wide coverage rate of a short-focus view field and high resolution of a long-focus view field, and can realize large-view-field searching and small-view-field tracking and measuring of a target in cooperation with the dual-view-field optical system.
In the structural design of the dual-view-field optical system, the number of lenses is large, the volume is large, the cost is high, and in order to further compensate the influence of temperature and distance, besides the adjusting lenses for switching the view fields, the adjusting lenses for compensating the temperature and the distance are additionally arranged, so that the structure of the dual-view-field optical system is further complicated.
Zemax: optical design software.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides the F22.5-45MM double-view-field infrared focusing lens, which can meet the switching of the F22.5-45MM large and small view fields, and has the advantages of simple structure, convenient adjustment, small volume and low cost. The specific technical scheme is as follows.
The optical system of the lens comprises a front fixed group, a field switching mirror and a rear fixed group which are sequentially arranged from front to back along the optical axis transmission direction; the front fixed group comprises a meniscus positive lens A with a convex surface facing the object; the view field switching mirror comprises a biconcave lens B; the rear fixed group comprises a biconvex lens C and a meniscus positive lens D, wherein the biconvex lens C and the meniscus positive lens D are sequentially arranged along the optical axis transmission direction; the field switching mirror is movable back and forth along the optical axis transmission direction.
Preferably, the center thickness of the lens A is 5mm, the object-side fitting radius of curvature is 75mm, and the image-side fitting radius of curvature is 113.8mm; the center thickness of the biconcave lens B is 2.2mm, the object-side fitting curvature radius is-131 mm, and the image-side fitting curvature radius is 119mm; the center thickness of the biconvex lens C is 4.5mm, the object side fitting curvature radius is 218mm, and the image side fitting curvature radius is-207.884 mm; the center thickness of the positive meniscus lens D is 4.5mm, the object-side fitting curvature radius is-383 mm, and the image-side fitting curvature radius is-95.22 mm.
Preferably, the air interval adjusting range between the positive meniscus lens A and the biconcave lens B is 15mm-27.3mm; the air interval adjusting range between the biconcave lens B and the biconvex lens C is 18.7mm-31mm; the air space between the lenticular lens C and the meniscus positive lens D is 22.65mm.
Preferably, at least one surface of each lens in the front fixed group, the field switching mirror and the rear fixed group is an aspheric surface.
Preferably, the image side surface of the positive meniscus lens a, the object side surface and the image side surface of the biconcave lens B, the object side surface of the biconvex lens C, and the object side surface of the positive meniscus lens D are aspheric, and satisfy the aspheric formula:
wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the height r along the optical axis direction; c=1/R; r is the paraxial curvature fitting radius of the mirror surface; k is a conic coefficient; a, B, C, D and E are higher order aspheric coefficients.
Preferably, the object side surface of the lenticular lens C is a diffraction surface, and the expression equation of the diffraction surface in Zemax is:
wherein M is a diffraction order; b (B) 1 、B 2 、B 3 Is the phase coefficient of the diffraction plane, B 1 =-11.27，B 2 =0.77，B 3 -1.39; diffraction orders 1; the normalized radius r is 21.
Preferably, the materials of the positive meniscus lens A, the biconcave lens B, the biconvex lens C and the positive meniscus lens D are germanium single crystals.
Preferably, the mechanical structure of the lens comprises a main lens barrel, a rotary barrel, a movable lens barrel, a multiple lens group barrel and a driving piece for driving the rotary barrel to rotate; the rotary drum is sleeved on the outer peripheral surface of the main lens barrel, the movable lens barrel is arranged in the main lens barrel and is in axial sliding connection with the main lens barrel, and the multiple lens group barrel is sleeved in the movable lens barrel and is fixedly connected with the main lens barrel; the movable lens barrel axially moves along with the rotation of the rotary drum through the connecting piece; the double convex lens C and the positive meniscus lens D are arranged in the lens group barrel.
Preferably, the connecting piece is a pin, the pin is arranged on the outer peripheral surface of the moving lens barrel, and the side walls of the main lens barrel and the rotating cylinder are respectively provided with a straight slideway and a spiral slideway which can accommodate the pin to pass through; the outer peripheral surface of the rotary drum is provided with a first gear, and the driving shaft of the driving piece is provided with a second gear meshed with the first gear; the second gear drives the rotary drum to rotate through the first gear under the action of the driving piece, and the moving lens barrel is driven to axially move in the main lens barrel through the pin under the action of the straight slide way and the spiral slide way.
Preferably, a first pressing ring is arranged on the object side of the positive meniscus lens A, and a first O-shaped ring is arranged between the positive meniscus lens A and the main lens barrel; a second pressing ring is arranged between the movable lens cone and the biconcave lens B on the object side of the biconcave lens B; a third pressing ring is arranged between the lens group barrel and the biconvex lens on the object side of the biconvex lens C; and a fourth clamping ring is arranged between the lens group barrel and the positive meniscus lens D at the image side of the positive meniscus lens D.
Compared with the prior art, the invention has the beneficial effects that:
(1) The F22.5-45MM double-view-field infrared focusing lens provided by the invention provides a new scheme for double-view-field switching with the focal length of 22.5-45MM, and can be matched with a detector with the pixel number of 640X512 and the pixel size of 12 mu m.
(2) The optical lens has simple and compact structure, small number of lenses and good image plane stability.
(3) The invention combines the optical athermalization compensation mode and the mechanical focusing compensation mode, realizes the mode of adjusting only one lens, can finish focusing on temperature compensation and distance, and simultaneously completes switching of double fields of view.
(4) Has good imaging effect at the working temperature of-40 ℃ to 60 ℃.
(5) The visual field is switched conveniently, stably and rapidly.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a cross-sectional view of a F22.5-45MM dual-field infrared focus lens in example 1;
FIG. 2 is a lens appearance diagram of the F22.5-45MM dual-field infrared focus adjustment lens in example 1;
fig. 3 is a lens composition diagram of the F22.5-45MM dual-field infrared focus adjusting lens in embodiment 1.
Reference numerals:
1. a main barrel; 2. a meniscus positive lens a; 3. a first clamping ring; 4. a second O-ring; 5. a first O-ring; 6. a second clamping ring; 7. a gasket; 8. biconcave lens B; 9. a third clamping ring; 10. a lenticular lens C; 11. a pin bushing; 12. a pin; 13. a rotating drum; 14. a lens group barrel; 15. a meniscus positive lens D; 16. a fourth clamping ring; 17. a frame; 18. an interface; 19. a driving member; 20. a second gear; 21. a protective germanium window; 22. a FPA; 23. moving the lens barrel; 24. a spiral slideway; 25. a first gear.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment provides an F22.5-45MM double-view-field infrared focusing lens. As shown in fig. 1 to 3, the optical system of the lens is composed of a front fixed group, a field switching mirror, a rear fixed group, which are sequentially arranged from front to rear along the optical axis transmission direction; the front fixed group comprises a meniscus positive lens A2 with the convex surface facing the object; the view field switching mirror comprises a biconcave lens B8; the rear fixed group includes a biconvex lens C10 and a meniscus positive lens D15 with its convex surface facing the image side, which are sequentially arranged in the optical axis transfer direction. Wherein the biconcave lens B8 is movable back and forth in the optical axis transmission direction.
The mechanical structure of the lens includes a main barrel 1, a barrel 13, a moving barrel 23, a magnification lens group barrel 14, and a driving member 19 that drives the barrel 13 to rotate.
Specifically, the rotary drum 13 is sleeved on the outer peripheral surface of the main lens barrel 1, the movable lens barrel 23 is arranged in the main lens barrel 1 and is in sliding connection with the main lens barrel 1 along the axial direction, and the double lens group barrel 14 is sleeved in the movable lens barrel 23 and is fixedly connected with the main lens barrel 1; the moving cylinder 23 moves axially by the rotation of the drum 13 through the connection; the meniscus positive lens A2 is disposed in front of the inner cavity of the main barrel 1, the biconcave lens B8 is disposed in the moving barrel 23, and the biconvex lens C10 and the meniscus positive lens D15 are disposed in the magnification lens group barrel 14.
As a specific embodiment, the connecting piece is a pin 12, and the side walls of the main lens barrel 1 and the rotary barrel 13 are respectively provided with a straight slide way and a spiral slide way 24 which can accommodate the pin 12 to pass through; the pin 12 is provided on the outer peripheral surface of the moving barrel 23, and passes through the straight slide and the spiral slide 24. The outer peripheral surface of the rotary drum 13 is provided with a first gear 25, and the driving shaft of the driving member 19 is provided with a second gear 20 meshed with the first gear 25; the second gear 20 drives the rotary drum 13 to rotate through the first gear 25 under the action of the driving piece 19, and drives the movable lens barrel 23 to axially move in the main lens barrel 1 through the pin 12 under the action of the straight slide channel and the spiral slide way 24.
The rear part of the main lens barrel 1 is provided with an interface 18 which is connected with a detector. The front end surface of the main lens barrel 1 is provided with a second O-shaped ring 4 for tightly attaching the main lens barrel 1 to the outside; a gasket 7 is arranged between the rotary drum 13 and the main lens barrel 1; the outer peripheral surface of the pin 12 is provided with a pin bushing 11.
The driving member 19 may be a motor or other electrical element capable of rotating the second gear 20. As a specific embodiment, the driving member 19 in this embodiment employs a motor fixed to the main barrel 1 through the frame 17.
On the object side of the positive meniscus lens A2, a first pressing ring 3 is arranged on the inner peripheral surface of the main lens barrel 1, a first O-shaped ring 5 is arranged between the positive meniscus lens A2 and the main lens barrel 1, and the positive meniscus lens A2 is positioned on the object side through the first pressing ring 3 and the first O-shaped ring 5; on the image side of the positive meniscus lens A2, an annular protrusion is provided on the inner peripheral surface of the main barrel 1 for positioning the image side of the positive meniscus lens A2. A second pressing ring 6 is arranged between the moving lens barrel 23 and the biconcave lens B8 on the object side of the biconcave lens B8 and is used for positioning the biconcave lens B8 on the object side; on the image side of the biconcave lens B8, an annular projection is provided on the inner peripheral surface of the moving barrel 23 for image side positioning of the biconcave lens B8. A third clamping ring 9 is arranged between the lens group barrel 14 and the biconvex lens C10 at the object side of the biconvex lens C10 and is used for positioning the object side of the biconvex lens C10; on the image side of the lenticular lens C10, an annular projection is provided on the inner peripheral surface of the magnification lens group barrel 14 for image side positioning of the lenticular lens C10. A fourth clamping ring 16 is arranged between the lens group barrel 14 and the positive meniscus lens D15 at the image side of the positive meniscus lens D15 and is used for positioning the image side of the positive meniscus lens D15; on the object side of the meniscus positive lens D15, an annular protrusion is provided on the inner peripheral surface of the power lens group barrel 14 for object side positioning of the meniscus positive lens D15.
The focusing operation principle of this embodiment is as follows: the driving shaft of the driving piece 19 drives the second gear 20 to rotate, the second gear 20 drives the first gear 25 to rotate, the first gear 25 drives the rotary drum 13 to rotate, and the moving lens barrel 23 is driven by the pin 12 to axially move in the main lens barrel 1 under the action of the straight slide way and the spiral slide way 24, and the biconcave lens B8 moves along with the movement of the moving lens barrel 23, so that the biconcave lens B8 is moved.
The light passes through the meniscus positive lens A2, the biconcave lens B8, the biconvex lens C10, and the meniscus positive lens D15 in this order, passes through the germanium window 21 for protection, and reaches the detector focal plane array FPA22.
The lens structure design of the embodiment ensures concentricity and precision of the lens barrel, and stability of the focusing process, and is convenient for focusing operation. The whole structure only adopts four lenses, and the structure is simple and the cost is low.
As a specific embodiment, specific parameters of each lens are shown in tables 1 to 2.
The center thickness of the positive meniscus lens A2 in the embodiment is 5mm, the object-side fitting radius of curvature is 75mm, and the image-side fitting radius of curvature is 113.8mm; the center thickness of the biconcave lens B8 is 2.2mm, the object-side fitting curvature radius is-131 mm, and the image-side fitting curvature radius is 119mm; the center thickness of the biconvex lens C10 is 4.5mm, the object-side fitting curvature radius is 218mm, and the image-side fitting curvature radius is-207.88 mm; the center thickness of the meniscus positive lens D15 was 4.5mm, the object-side fitting radius of curvature was-383 mm, and the image-side fitting radius of curvature was-95.22 mm.
When temperature and distance compensation and double-view-field switching are carried out, the air interval adjusting range between the meniscus positive lens A2 and the biconcave lens B8 is 15mm-27.3mm, and the air interval adjusting range between the biconcave lens B8 and the biconvex lens C10 is 18.7mm-31mm. The air space between the lenticular lens C10 and the meniscus positive lens D15 is 22.65mm.
And adjusting the biconcave lens B8 to switch the size view field. Wherein, when the focal length of the system is 22.5mm, the field of view range is 15.55 degrees X19.37 degrees. The field of view range is 7.81 deg. X9.75 deg. when the focal length of the system is 45 mm.
The material of the meniscus positive lens A2, the biconcave lens B8, the biconvex lens C10 and the meniscus positive lens D15 is germanium monocrystal.
It is understood that from left to right along the optical axis, the left side is the object side, the right side is the image side, and the S1 plane of the meniscus positive lens A2 is the object side, and the S2 plane is the image side. Correspondingly, the object side direction is the object side, and the image side direction is the image side. And will not be described in detail herein.
Table 1 parameters of each lens
Table 2 aspherical coefficient data
As shown in table 2, the image side surface S2 of the positive meniscus lens A2, the object side surface S3 and the image side surface S4 of the biconcave lens B8, the object side surface S5 of the biconvex lens C10, and the object side surface S7 of the positive meniscus lens D15 are aspherical surfaces, and satisfy the following expression:
wherein: z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the height r along the optical axis direction; c=1/R; r is the paraxial curvature fitting radius of the mirror surface; k is a conic coefficient; a, B, C, D and E are higher order aspheric coefficients.
The object side surface S5 of the lenticular lens C10 is a diffraction surface, and the expression equation of the diffraction surface in Zemax is:
wherein M is a diffraction order; b (B) 1 、B 2 、B 3 Is the phase coefficient of the diffraction plane, B 1 =-11.27，B 2 =0.77，B 3 -1.39; diffraction orders 1; the normalized radius r is 21.
The lens provided by the embodiment achieves the following optical indexes.
Working wave band: 8 μm to 12 μm;
type of detector: 1280×1024, 12 μm;
focal length: 22.5/45mm;
f number: 0.8;
operating temperature: -40-60 ℃;
maximum distortion is less than 3%;
horizontal angle of view: 19.37 °/9.75 °, vertical field angle: 15.55/7.81.
The optical lens has the advantages of simple and compact structure, less lenses and good image plane stability; the optical athermalization compensation mode and the mechanical focusing compensation mode are combined, so that the mode of adjusting only one lens is realized, the focusing of temperature compensation and distance can be finished, and meanwhile, the switching of double fields of view is finished; the imaging agent has good imaging effect at the working temperature of-40 ℃ to 60 ℃; the visual field is switched conveniently, stably and rapidly.
It is apparent that the above examples are only examples for clearly illustrating the technical solution of the present invention, and are not limiting of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are to be included in the protection of the present claims.
Claims (8)
1. An F22.5-45MM double-view-field infrared focusing lens is characterized in that an optical system of the lens consists of a front fixed group, a view-field switching lens and a rear fixed group which are sequentially arranged from front to rear along the optical axis transmission direction; the front fixed group comprises a meniscus positive lens A with a convex surface facing the object; the view field switching mirror comprises a biconcave lens B; the rear fixed group comprises a biconvex lens C and a meniscus positive lens D, wherein the biconvex lens C and the meniscus positive lens D are sequentially arranged along the optical axis transmission direction; the biconcave lens B can move back and forth along the optical axis transmission direction; the center thickness of the meniscus positive lens A is 5mm, the object side fitting curvature radius is 75mm, and the image side fitting curvature radius is 113.8mm; the center thickness of the biconcave lens B is 2.2mm, the object-side fitting curvature radius is-131 mm, and the image-side fitting curvature radius is 119mm; the center thickness of the biconvex lens C is 4.5mm, the object side fitting curvature radius is 218mm, and the image side fitting curvature radius is-207.884 mm; the center thickness of the meniscus positive lens D is 4.5mm, the object side fitting curvature radius is-383 mm, and the image side fitting curvature radius is-95.22 mm; the air interval adjusting range between the meniscus positive lens A and the biconcave lens B is 15mm-27.3mm; the air interval adjusting range between the biconcave lens B and the biconvex lens C is 18.7mm-31mm; the air space between the lenticular lens C and the meniscus positive lens D is 22.65mm.
2. The F22.5-45MM dual-field infrared focus lens of claim 1, wherein at least one surface of each of the front fixed group, the field switching mirror, and the rear fixed group is aspheric.
3. The F22.5-45MM dual-field infrared focusing lens according to claim 2, wherein the image side surface of the positive meniscus lens a, the object side surface and the image side surface of the biconcave lens B, the object side surface of the biconvex lens C, and the object side surface of the positive meniscus lens D are aspherical surfaces, and satisfy an aspherical formula:
wherein Z is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the height r along the optical axis direction; c=1/R; r is the paraxial curvature fitting radius of the mirror surface; k is a conic coefficient; a, B, C, D and E are higher order aspheric coefficients.
4. The F22.5-45MM dual-field infrared focusing lens according to claim 1, wherein the object side surface of the lenticular lens C is a diffraction surface, and the expression equation of the diffraction surface in Zemax is:
M(B 1 r 2 +B 2 r 4 +B 3 r 6 )
wherein M is a diffraction order; b (B) 1 、B 2 、B 3 Is the phase coefficient of the diffraction plane, B 1 ＝-11.27，B 2 ＝0.77，B 3 -1.39; diffraction orders 1; the normalized radius r is 21.
5. The F22.5-45MM dual-field infrared focusing lens as claimed in claim 1, wherein the positive meniscus lens a, the biconcave lens B, the biconvex lens C and the positive meniscus lens D are all made of germanium single crystals.
6. The F22.5-45MM dual-field infrared focus lens as defined in any one of claims 1 to 5, wherein the mechanical structure of the lens comprises a main barrel, a moving barrel, a magnification lens group barrel, and a driving member for driving the barrel to rotate; the rotary drum is sleeved on the outer peripheral surface of the main lens barrel, the movable lens barrel is arranged in the main lens barrel and is in axial sliding connection with the main lens barrel, and the multiple lens group barrel is sleeved in the movable lens barrel and is fixedly connected with the main lens barrel; the movable lens barrel axially moves along with the rotation of the rotary drum through the connecting piece; the double convex lens C and the positive meniscus lens D are arranged in the lens group barrel.
7. The F22.5-45MM dual-field infrared focus adjusting lens as defined in claim 6, wherein the connecting piece is a pin, the pin is arranged on the outer peripheral surface of the moving lens barrel, and the side walls of the main lens barrel and the rotating barrel are respectively provided with a straight slideway and a spiral slideway which can accommodate the pin to pass through; the outer peripheral surface of the rotary drum is provided with a first gear, and the driving shaft of the driving piece is provided with a second gear meshed with the first gear; the second gear drives the rotary drum to rotate through the first gear under the action of the driving piece, and the moving lens barrel is driven to axially move in the main lens barrel through the pin under the action of the straight slide way and the spiral slide way.
8. The F22.5-45MM dual-field infrared focus adjustment lens as defined in claim 6, wherein a first pressing ring is arranged on the inner peripheral surface of the main lens barrel on the object side of the positive meniscus lens a, and a first O-ring is arranged between the positive meniscus lens a and the main lens barrel; a second pressing ring is arranged between the movable lens cone and the biconcave lens B on the object side of the biconcave lens B; a third pressing ring is arranged between the lens group barrel and the biconvex lens on the object side of the biconvex lens C; and a fourth clamping ring is arranged between the lens group barrel and the positive meniscus lens D at the image side of the positive meniscus lens D.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111523929.9A CN114236793B (en) | 2021-12-14 | 2021-12-14 | F22.5-45MM double-view-field infrared focusing lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111523929.9A CN114236793B (en) | 2021-12-14 | 2021-12-14 | F22.5-45MM double-view-field infrared focusing lens |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114236793A CN114236793A (en) | 2022-03-25 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007264649A (en) * | 2007-05-15 | 2007-10-11 | Sumitomo Electric Ind Ltd | Infrared zoom lens and infrared camera |
| JP2019032507A (en) * | 2017-06-02 | 2019-02-28 | ブルーカー オプティク ゲーエムベーハ− | Self-centering lens structure for permeable deflection optical unit |
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| CN113741003B (en) * | 2021-08-13 | 2023-02-17 | 江西晶超光学有限公司 | Optical system, lens module and electronic equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2007264649A (en) * | 2007-05-15 | 2007-10-11 | Sumitomo Electric Ind Ltd | Infrared zoom lens and infrared camera |
| JP2019032507A (en) * | 2017-06-02 | 2019-02-28 | ブルーカー オプティク ゲーエムベーハ− | Self-centering lens structure for permeable deflection optical unit |
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