CN110412753B - Long-wave infrared large-aperture zoom lens and focusing method thereof - Google Patents
Long-wave infrared large-aperture zoom lens and focusing method thereof Download PDFInfo
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- CN110412753B CN110412753B CN201910728400.7A CN201910728400A CN110412753B CN 110412753 B CN110412753 B CN 110412753B CN 201910728400 A CN201910728400 A CN 201910728400A CN 110412753 B CN110412753 B CN 110412753B
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- meniscus lens
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- 238000000034 method Methods 0.000 title claims abstract description 10
- 230000005499 meniscus Effects 0.000 claims abstract description 91
- 230000003287 optical effect Effects 0.000 claims abstract description 25
- 238000003825 pressing Methods 0.000 claims description 21
- 229910001369 Brass Inorganic materials 0.000 claims description 4
- 239000010951 brass Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 239000005387 chalcogenide glass Substances 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 2
- 230000000149 penetrating effect Effects 0.000 claims description 2
- 238000003384 imaging method Methods 0.000 abstract description 11
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/02—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of crystals, e.g. rock-salt, semi-conductors
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/021—Mountings, adjusting means, or light-tight connections, for optical elements for lenses for more than one lens
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/026—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using retaining rings or springs
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
- G02B7/10—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification by relative axial movement of several lenses, e.g. of varifocal objective lens
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B13/00—Viewfinders; Focusing aids for cameras; Means for focusing for cameras; Autofocus systems for cameras
- G03B13/32—Means for focusing
- G03B13/34—Power focusing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lenses (AREA)
Abstract
The invention provides a long-wave infrared large-aperture zoom lens and a focusing method thereof, wherein the long-wave infrared large-aperture zoom lens comprises a main lens barrel, a first positive meniscus lens, a first negative meniscus lens and a second positive meniscus lens are sequentially arranged in the main lens barrel along the incidence direction of light rays from left to right, the air interval between the first positive meniscus lens and the first negative meniscus lens is 37.5mm, and the air interval adjusting range between the first negative meniscus lens and the second positive meniscus lens is 31.3 mm-33.2 mm. The invention has the characteristics of large aperture electric focusing, simple and compact structure, and in addition, in order to overcome the influence of temperature on the imaging performance of the infrared lens, the air interval focusing between lenses is adjusted by electric focusing, so that the infrared optical system can maintain good imaging quality in a larger temperature range, and the invention has innovativeness.
Description
Technical Field
The invention relates to a long-wave infrared large-aperture zoom lens and a focusing method thereof.
Background
Under the impact of a larger temperature difference, the imaging quality of the optical system is greatly reduced due to expansion or contraction of lens materials and mechanical parts and increase or decrease of refractive index of the lens materials, and particularly, the imaging quality of the optical system is more serious for an infrared optical system. With the wider and wider application range of the infrared optical lens, in many application occasions, the working temperature of the infrared lens has a large range, so that a user needs to be able to focus the lens, and the infrared optical system can maintain good imaging quality in a larger temperature range.
There are two ways in which infrared optical systems use more athermalization: optically athermalized and electrically athermalized. The optical athermalization has the advantages of simple structure, light weight, low cost, and the like, but the controllable temperature range of the optical athermalization cannot meet the needs of customers, so that the long-wave infrared large-aperture electric focusing lens can keep good imaging quality in a larger temperature range by using the electric athermalization. The long-wave infrared large-aperture electric focusing lens is provided with an electric focusing mechanism, but the structural design is optimized as much as possible on the design of the main lens barrel, so that the cost is reduced, and the structure of the lens is easy to process and assemble and can be produced in batches.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is to provide a long-wave infrared large-aperture zoom lens and a focusing method thereof, and the long-wave infrared large-aperture zoom lens has simple structure and good imaging effect.
The specific embodiments of the invention are: the utility model provides a long wave infrared large aperture zoom lens, includes the main lens barrel, first positive meniscus lens, first negative meniscus lens and second positive meniscus lens have been set gradually along light from left to right incident direction to main lens barrel inside, the air interval between first positive meniscus lens and the first negative meniscus lens is 37.5mm, the air interval adjusting range between first negative meniscus lens and the second positive meniscus lens is 31.3mm ~33.2mm.
Furthermore, the first positive meniscus lens and the second positive meniscus lens are made of long-wave monocrystalline germanium.
Further, the first negative meniscus lens material adopts chalcogenide glass.
Further, the right side of the first positive meniscus lens is an aspheric surface, and the left side of the second positive meniscus lens is an aspheric surface.
Further, the aspherical surfaces on the first positive meniscus lens and the second positive meniscus lens satisfy the following expression: ; where c=1/R, Z is the distance sagittal height from the aspherical vertex when the aspherical surface is at a position of height R in the optical axis direction, R represents the paraxial radius of curvature of the mirror surface, K is a conic coefficient, and A, B, C, D is a higher order aspherical coefficient.
Further, the first positive meniscus lens and the second positive meniscus lens are sequentially arranged in the front and the rear of the main lens barrel, an inner lens barrel matched with the main lens barrel in a moving way is arranged in the middle of the main lens barrel, a pressing ring A used for pressing and fixing the first positive meniscus lens in the main lens barrel is arranged on the first positive meniscus lens, a pressing ring B used for pressing and fixing the first negative meniscus lens in the inner lens barrel is arranged on the first negative meniscus lens, and a pressing ring C used for pressing and fixing the second positive meniscus lens in the main lens barrel is arranged on the second positive meniscus lens.
Further, the main lens barrel comprises a focusing group, the focusing group comprises a focusing cam, a motor frame is arranged at the rear side part of the main lens barrel, a motor is arranged on the motor frame, a driving gear matched with the focusing cam is arranged on an output shaft of the motor, a pair of guide nails penetrating through the main lens barrel and the inner lens barrel and driven to move by the focusing cam to rotate are arranged at two sides of the main lens barrel, and brass space rings are arranged outside the guide nails.
Further, a focusing method of the long-wave infrared large-aperture zoom lens comprises the following steps: the motor drives the focusing gear to rotate through the driving gear on the motor, so that the inner lens barrel and the first negative meniscus lens on the inner lens barrel are driven to translate back and forth in the main lens barrel along the optical axis direction, and the optical system focusing is carried out.
Compared with the prior art, the invention has the following beneficial effects: the device has the characteristics of compact structure, reasonable design, large-aperture electric focusing, simple and compact lens structure, and in addition, in order to overcome the influence of temperature on the imaging performance of the infrared lens, the air interval focusing between lenses is adjusted through electric focusing, so that the infrared optical system can keep good imaging quality in a larger temperature range.
Drawings
FIG. 1 is a schematic view of an optical structure of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a first embodiment of the present invention;
FIG. 3 is a schematic diagram of a second embodiment of the present invention.
In the figure: 1-main lens barrel, 2-first positive meniscus lens, 3-first negative meniscus lens, 4-second positive meniscus lens, 5-focusing group, 6-focusing cam, 7-motor frame, 8-motor, 9-inner lens barrel, 10-pressing ring A, 11-pressing ring B, 12-pressing ring C, 13-driving gear, 14-guide pin, 15-brass spacer ring and 16-limit switch.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Example 1: as shown in fig. 1-3, in this embodiment, a long-wave infrared large-aperture zoom lens is provided, which includes a main lens barrel 1, a first positive meniscus lens 2, a first negative meniscus lens 3 and a second positive meniscus lens 4 are sequentially disposed in the main lens barrel 1 along the incident direction of light from left to right, the air interval between the first positive meniscus lens and the first negative meniscus lens is 37.5mm, and the air interval adjusting range between the first negative meniscus lens and the second positive meniscus lens is 31.3 mm-33.2 mm.
In this embodiment, the first positive meniscus lens 2 and the second positive meniscus lens 4 are made of long-wave single crystal germanium.
In this embodiment, the first negative meniscus lens 3 is made of chalcogenide glass.
In this embodiment, the right side of the first positive meniscus lens is an aspheric surface, and the left side of the second positive meniscus lens is an aspheric surface.
In this embodiment, the aspherical surface on the first positive meniscus lens and the second positive meniscus lens satisfies the following expression:
；
where c=1/R, Z is the distance sagittal height from the aspherical vertex when the aspherical surface is at a position of height R in the optical axis direction, R represents the paraxial radius of curvature of the mirror surface, K is a conic coefficient, and A, B, C, D is a higher order aspherical coefficient.
In this embodiment, the first positive meniscus lens and the second positive meniscus lens are sequentially installed inside the front and rear of the main lens barrel, the inner lens barrel 9 which is matched with the movement of the main lens barrel is arranged in the middle of the main lens barrel, the first positive meniscus lens is provided with a pressing ring A10 for pressing and fixing the first positive meniscus lens in the main lens barrel, the first negative meniscus lens is provided with a pressing ring B11 for pressing and fixing the first negative meniscus lens in the inner lens barrel, and the second positive meniscus lens is provided with a pressing ring C12 for pressing and fixing the second positive meniscus lens in the main lens barrel.
In this embodiment, the main lens barrel 1 includes focusing group 5, focusing group 5 includes focusing cam 6, motor frame 7 is installed to main lens barrel rear side portion, install motor 8 on the motor frame, be equipped with on the motor output shaft with focusing cam matched with drive gear 13, main lens barrel both sides are provided with a pair of guide pin 14 that runs through main lens barrel and interior lens cone and drive interior lens cone removal by focusing cam rotation, and every guide pin outside is equipped with brass space ring 15.
In this embodiment, a guiding straight groove is provided at the inner side of the main lens barrel 1, and the inner side of the inner lens barrel is matched with the guiding straight groove and drives the inner lens barrel to move back and forth along the guiding straight groove under the rotation of the focusing cam.
In this embodiment, the inner barrel 1 is provided with the vent hole, so that the inner barrel cannot move due to air extrusion in the inner barrel when the inner barrel moves back and forth, and smooth focusing and no clamping stagnation can be ensured.
In this embodiment, the side of the main lens barrel is provided with a limit switch 16.
In this embodiment, when in use, the motor 8 drives the focusing cam 6 to rotate through the driving gear 13 thereon, so as to drive the inner barrel and the first negative meniscus lens on the inner barrel to translate back and forth along the optical axis direction, thereby focusing the optical system. The device adopts the structure of "+, -, +" and has the characteristic of large aperture electric focusing, the structure of the lens is simple and compact, and in addition, in order to overcome the influence of temperature on the imaging performance of the infrared lens, the air interval focusing between lenses is adjusted through electric focusing, so that the infrared optical system can keep good imaging quality in a larger temperature range.
Example 2: in this embodiment, the optical element parameter table composed of the first positive meniscus lens, the first negative meniscus lens, and the second positive meniscus lens is as follows:
in the table above, S1, S3, S5 are the left faces of the first positive meniscus lens, the first negative meniscus lens, and the second positive meniscus lens, respectively, and S2, S4, S6 are the right faces of the first positive meniscus lens, the first negative meniscus lens, and the second positive meniscus lens, respectively.
Example 3: in this embodiment, the optical structure formed by the first positive meniscus lens, the first negative meniscus lens and the second positive meniscus lens achieves the following optical indexes:
(1) Working wave band: 8 μm to 12 μm;
(2) Focal length: f' =75.0 mm;
(3) The detector comprises: long-wave infrared non-refrigeration 640 x 480, 17 μm;
(4) Angle of view: 5.48 ° (H) ×3.76 ° (V);
(5) Relative pore diameter D/f': 1/1.0;
(6) The total length of the optical system was 89.8mm.
In this embodiment, the lens can be matched with a long-wave infrared uncooled 640 x 480 um detector, and is used for various platforms on-board, on-land and the like to perform tasks such as temperature measurement, security monitoring and the like.
Any of the above-described embodiments of the present invention disclosed herein, unless otherwise stated, if they disclose a numerical range, then the disclosed numerical range is the preferred numerical range, as will be appreciated by those of skill in the art: the preferred numerical ranges are merely those of the many possible numerical values where technical effects are more pronounced or representative. Since the numerical values are more and cannot be exhausted, only a part of the numerical values are disclosed to illustrate the technical scheme of the invention, and the numerical values listed above should not limit the protection scope of the invention.
Meanwhile, if the above invention discloses or relates to parts or structural members fixedly connected with each other, the fixed connection may be understood as follows unless otherwise stated: detachably fixed connection (e.g. using bolts or screws) can also be understood as: the non-detachable fixed connection (e.g. riveting, welding), of course, the mutual fixed connection may also be replaced by an integral structure (e.g. integrally formed using a casting process) (except for obviously being unable to use an integral forming process).
If the terms "first," "second," etc. are used herein to define a part, those skilled in the art will recognize that: the use of "first" and "second" is used merely to facilitate distinguishing between components and not otherwise stated, and does not have a special meaning.
In addition, terms used in any of the above-described aspects of the present disclosure to express positional relationship or shape have meanings including a state or shape similar to, similar to or approaching thereto unless otherwise stated.
Any part provided by the invention can be assembled by a plurality of independent components, or can be manufactured by an integral forming process.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (6)
1. The long-wave infrared large-aperture zoom lens is characterized by comprising a main lens barrel, wherein a first positive meniscus lens, a first negative meniscus lens and a second positive meniscus lens are sequentially arranged in the main lens barrel along the incidence direction of light rays from left to right, the air interval between the first positive meniscus lens and the first negative meniscus lens is 37.5mm, and the air interval adjusting range between the first negative meniscus lens and the second positive meniscus lens is 31.3 mm-33.2 mm;
The first positive meniscus lens and the second positive meniscus lens are sequentially arranged in the front and the rear of the main lens barrel, an inner lens barrel which is matched with the main lens barrel in a moving way is arranged in the middle of the main lens barrel, a pressing ring A for pressing and fixing the first positive meniscus lens in the main lens barrel is arranged on the first positive meniscus lens, a pressing ring B for pressing and fixing the first negative meniscus lens in the inner lens barrel is arranged on the first negative meniscus lens, and a pressing ring C for pressing and fixing the second positive meniscus lens in the main lens barrel is arranged on the second positive meniscus lens;
The main lens barrel comprises a focusing group, the focusing group comprises a focusing cam, a motor frame is arranged on the rear side part of the main lens barrel, a motor is arranged on the motor frame, a driving gear matched with the focusing cam is arranged on an output shaft of the motor, a pair of guide nails penetrating through the main lens barrel and the inner lens barrel and driven to move by the focusing cam to rotate are arranged on two sides of the main lens barrel, and brass space rings are arranged outside the guide nails.
2. The long-wave infrared large-aperture zoom lens of claim 1, wherein the first positive meniscus lens and the second positive meniscus lens are made of long-wave single crystal germanium.
3. The long-wave infrared large-aperture zoom lens of claim 1, wherein the first negative meniscus lens material is chalcogenide glass.
4. The long-wave infrared large-aperture zoom lens of claim 1, wherein the right side of the first positive meniscus lens is aspherical and the left side of the second positive meniscus lens is aspherical.
5. The long-wave infrared large-aperture zoom lens according to claim 1, wherein the aspherical surfaces on the first positive meniscus lens and the second positive meniscus lens satisfy the following expression:
；
where c=1/R, Z is the distance sagittal height from the aspherical vertex when the aspherical surface is at a position of height R in the optical axis direction, R represents the paraxial radius of curvature of the mirror surface, K is a conic coefficient, and A, B, C, D is a higher order aspherical coefficient.
6. A focusing method using the long-wave infrared large-aperture zoom lens as set forth in claim 1, comprising the steps of: the motor drives the focusing gear to rotate through the driving gear on the motor, so that the inner lens barrel and the first negative meniscus lens on the inner lens barrel are driven to translate back and forth in the main lens barrel along the optical axis direction, and the optical system focusing is carried out.
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| CN201910728400.7A CN110412753B (en) | 2019-08-08 | 2019-08-08 | Long-wave infrared large-aperture zoom lens and focusing method thereof |
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| CN201910728400.7A CN110412753B (en) | 2019-08-08 | 2019-08-08 | Long-wave infrared large-aperture zoom lens and focusing method thereof |
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| CN110412753B true CN110412753B (en) | 2024-07-05 |
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| CN106154522B (en) * | 2016-08-22 | 2018-08-21 | 福建福光股份有限公司 | The big target surface double-view field zoom lens of LONG WAVE INFRARED and its Zooming method |
| CN106443988B (en) * | 2016-12-16 | 2018-10-02 | 福建福光股份有限公司 | Airborne light-type 50mm LONG WAVE INFRARED tight shots |
| CN107505690B (en) * | 2017-09-26 | 2020-01-21 | 福建福光股份有限公司 | Airborne light 120mm medium wave infrared fixed focus lens |
| CN109116526A (en) * | 2018-10-20 | 2019-01-01 | 福建福光股份有限公司 | The big light passing amount optics in LONG WAVE INFRARED large aperture is without thermalization camera lens and its imaging method |
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