CN110208920B - Long-wave mechanical athermalization focusing infrared lens and assembly method thereof - Google Patents
Long-wave mechanical athermalization focusing infrared lens and assembly method thereof Download PDFInfo
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- CN110208920B CN110208920B CN201910507969.0A CN201910507969A CN110208920B CN 110208920 B CN110208920 B CN 110208920B CN 201910507969 A CN201910507969 A CN 201910507969A CN 110208920 B CN110208920 B CN 110208920B
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- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000007789 sealing Methods 0.000 claims description 15
- 238000003825 pressing Methods 0.000 claims description 14
- 230000000149 penetrating effect Effects 0.000 claims description 8
- 230000003287 optical effect Effects 0.000 abstract description 10
- 238000013461 design Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000002834 transmittance Methods 0.000 abstract description 3
- 238000003384 imaging method Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000003331 infrared imaging Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- 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
- 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
- G02B7/028—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with means for compensating for changes in temperature or for controlling the temperature; thermal stabilisation
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Lens Barrels (AREA)
- Lenses (AREA)
Abstract
The invention provides a long-wave mechanical athermalization focusing infrared lens and an assembly method thereof, wherein the lens comprises a lens barrel, a positive lens A, a negative lens B and a positive lens C are sequentially arranged in the lens barrel along the incidence direction of light rays from left to right, the air interval between the positive lens A and the negative lens B is 8.89mm, and the air interval between the negative lens B and the positive lens C is 6.34mm. The invention has reasonable design, compact structure, convenient carrying, high light transmittance, stable optical axis of the lens in the focusing process and low manufacturing cost, is suitable for batch planning production, and has innovation and practicability.
Description
Technical Field
The invention relates to a long-wave mechanical athermalized focusing infrared lens and an assembly method thereof.
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 not interfered by strong light and flash of a battlefield, can realize long-distance all-weather observation, and is particularly suitable for target detection at night and under bad weather conditions.
However, the temperature not only can influence 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 are offset, the optical imaging quality is reduced, the image is blurred, the contrast is reduced, and the imaging performance of the lens is finally influenced, but the offset of the imaging plane can be caused by the compensation of the temperature change through the expansion coefficients of different materials; meanwhile, when the lens monitors objects with different distances, the optimal image surfaces are not on the same surface when the objects with different distances are imaged through the lens, so that image blurring is caused; objects with different distances can be imaged on the same surface through the lens in a lens focusing mode.
Disclosure of Invention
The invention improves the problems, namely the technical problem to be solved by the invention is a long-wave mechanical athermalization focusing infrared lens and an assembly method thereof, the imaging is clear, the structure is simple, and the mechanical athermalization adjustment is realized.
The specific embodiments of the invention are: the utility model provides a long wave machinery does not have heat focusing infrared lens, includes the lens cone, positive lens A, negative lens B and positive lens C have been set gradually along light from left to right incident direction in the lens cone, positive lens A and negative lens B's air interval is 8.89mm, negative lens B and positive lens C's air interval is 6.34mm.
Further, the lens cone includes the main lens cone, install the mechanical athermalization part on the main lens cone, the mechanical athermalization part is including installing first expansion ring and the second expansion ring on the main lens cone, be equipped with the mounting between first expansion ring and the second expansion ring, still be provided with on the main lens cone and remove the seat, it is equipped with first sealing washer to remove to be equipped with on the seat, is equipped with on the main lens cone and is used for the fixed back shelves circle of main lens cone with removing the seat, it still is equipped with elastic gasket to remove between seat and the back shelves circle.
Further, the outer side of the main lens barrel is provided with an outer cover, a second sealing ring is arranged on the inner side of the outer cover, a focusing guide pin penetrating through the outer cover and the movable seat is arranged on the outer cover, a focusing cam is arranged on the focusing guide pin, and a second telescopic ring, a fixing piece and a first telescopic ring are sequentially arranged between the outer cover and the main lens barrel.
Further, the positive lens A, the negative lens B and the positive lens C are all fixed inside the main lens barrel, and a space ring is arranged between the positive lens A and the negative lens B.
Further, the positive lens C is provided with a rear pressing ring for fixing the positive lens C on the main lens barrel, and the negative lens B is provided with a front pressing ring for fixing the negative lens B on the main lens barrel.
Further, a fixing screw penetrating through the outer cover is fixedly connected to the outer cover.
Furthermore, a limiting ring is arranged between the focusing cam and the main lens barrel.
Further, an assembling method of the long wave mechanical athermalized focusing infrared lens according to claim 7 comprises the following steps: (1) Firstly, sequentially placing a positive lens A, a space ring and a negative lens B into the front interior of a main lens cone, and compacting and fixing by using a front pressing ring; (2) Then the positive lens C is arranged in the rear of the main lens barrel and is pressed and fixed by a rear pressing ring; (3) Sequentially fixing the first telescopic ring, the fixing piece and the second telescopic ring outside the main lens barrel, and then installing and fixing the movable seat provided with the first sealing ring on the main lens barrel, so that the first telescopic ring, the fixing piece and the second telescopic ring are positioned between the movable seat and the main lens barrel; (4) After the elastic gasket is arranged on the movable seat, the main lens barrel is fixed on the movable seat by the rear check ring; (5) The second sealing ring is firstly pre-installed on the outer cover, the focusing guide nail penetrating through the outer cover and the movable seat is installed on the outer cover, and the focusing cam is installed on the focusing guide nail; (6) installing a limiting ring between the focusing cam and the movable seat; (7) Finally, the outer cover is covered with a fixing screw, and the assembly is completed.
Compared with the prior art, the invention has the following beneficial effects: the device has reasonable design, compact structure, short structure length of the lens, stable and unbiased optical axis in the focusing process, convenient carrying and high transmittance, can be matched with a long-wave infrared uncooled 640 x 512 17 mu m detector in the optical design to perform live recording and monitoring tasks, has low manufacturing cost, is suitable for large-scale production, and has practicability.
Drawings
FIG. 1 is a schematic diagram of a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a second embodiment of the present invention.
In the figure: the lens comprises a 1-limiting ring, a 2-focusing cam, a 3-focusing guide pin, a 4-housing, a 5-fixing screw, a 6-second telescopic ring, a 7-fixing piece, an 8-first telescopic ring, a 9-main lens barrel, a 10-positive lens A, an 11-spacer ring, a 12-first sealing ring, a 13-negative lens B, a 14-front pressing ring, a 15-second sealing ring, a 16-moving seat, a 17-elastic gasket, a 18-rear blocking ring, a 19-rear pressing ring and a 20-positive lens C.
Detailed Description
The invention will be described in further detail with reference to the drawings and the detailed description.
Examples: as shown in fig. 1-2, in this embodiment, a long-wave mechanical athermalized focusing infrared lens is provided, which includes a lens barrel, a positive lens a10, a negative lens B13 and a positive lens C20 are sequentially disposed in the lens barrel along a direction of incidence of light from left to right, an air interval between the positive lens a10 and the negative lens B13 is 8.89mm, and an air interval between the negative lens B13 and the positive lens C20 is 6.34mm.
In this embodiment, the lens barrel includes main lens barrel 9, install the mechanical athermalization part on the main lens barrel 9, the mechanical athermalization part is including installing first expansion ring 8 and the second expansion ring 6 on main lens barrel 9, be equipped with mounting 7 between first expansion ring 8 and the second expansion ring 6, still be provided with on the main lens barrel 9 and remove seat 16, be equipped with first sealing washer 12 on the removal seat 16, be equipped with on the main lens barrel 9 and be used for removing the fixed back shelves circle 18 of seat 16 with main lens barrel 9, still be equipped with elastic gasket 17 between removal seat 16 and the back shelves circle 18.
When the lens is used, the mechanical athermalization is realized by the expansion coefficients of the first telescopic ring, the fixing piece and the second telescopic ring, and the expansion of the first telescopic ring, the fixing piece and the second telescopic ring generated when the temperature changes drives the main lens cone and the positive lens A, the negative lens B and the positive lens C on the main lens cone to move back and forth, so that the image plane deviation caused by the temperature change is compensated.
In this embodiment, the outside portion of main lens barrel 9 is equipped with dustcoat 4, install second sealing washer 15 on the dustcoat 4 inboard, be provided with the focusing guide pin 3 that runs through dustcoat and removal seat on the dustcoat 4, install focusing cam 2 on the focusing guide pin 3, second expansion ring 6, mounting 7, first expansion ring 8 are located in proper order between dustcoat and the main lens barrel, can adjust focusing cam 2 through rotatory, be provided with on the main lens barrel with the guide way of focusing guide pin mutually supporting, the focusing guide pin is back and forth movement under the guide way restriction to drive the main lens barrel and do back and forth movement, guarantee like this that focusing process lens optical axis only reciprocates, avoid the lens optical axis to produce big skew in the removal in-process.
In this embodiment, the positive lens a10, the negative lens B13 and the positive lens C20 are fixed inside the main barrel 9, and a spacer 11 is provided between the positive lens a10 and the negative lens B13.
In this embodiment, the positive lens C is provided with a rear pressing ring 19 for fixing the positive lens C to the main barrel, and the negative lens B is provided with a front pressing ring 14 for fixing the negative lens B to the main barrel.
In this embodiment, a fixing screw 5 penetrating through the outer cover is fixedly connected to the outer cover 4.
In this embodiment, a limiting ring 1 is disposed between the focusing cam and the main lens barrel.
In the embodiment, the device can be adapted to a long-wave infrared uncooled 640 x 512 17 μm detector for live recording and monitoring tasks.
In the present embodiment, the optical structure composed of the positive lens A7, the negative lens B9, and the positive lens C11 achieves the following optical indexes:
working wave band: 8 μm to 12 μm;
focal length: f' =15 mm;
the detector comprises: long wave infrared non-refrigeration 640 x 512, 17 μm;
angle of view: 39.9 x 32.3 °;
relative pore diameter D/f': 1/1.
In this embodiment, the parameters of the positive lens a, the negative lens B, and the positive lens C are as follows:
in the above table, the surface numbers S1, S3, S5 are mirror surfaces of the lens seen from left to right, and the surface numbers S2, S4, S6 are mirror surfaces of the lens seen from right to left.
In this embodiment, during assembly, firstly, the positive lens a10, the spacer ring 11 and the negative lens B13 are sequentially placed in the main lens barrel 9, the front pressing ring 14 is used to press and fix the outer part of the negative lens B13, then the positive lens C20 is mounted on the inner wall of the main lens barrel 9 behind the negative lens B, the rear pressing ring 19 is used to fix the inner wall of the main lens barrel 9, the first telescopic ring 8, the fixing piece 7 and the second telescopic ring 6 are sequentially mounted on the outer part of the main lens barrel 9, the movable seat 16 with the first sealing ring 12 is mounted on the main lens barrel 9, the movable seat 16 is fixed with the main lens barrel 9 by adopting the rear retaining ring 18, the elastic gasket 17 is arranged in advance between the movable seat 16 and the main lens barrel 9, finally, the second sealing ring 15 is mounted inside the housing 4, the housing with the second sealing ring is mounted outside the movable seat 16, meanwhile, the guide pin 3 penetrating the housing and the movable seat is mounted on the housing 4, the cam 2 is screwed on the end part of the guide pin 3, the cam 1 is mounted between the cam 2 and the movable seat 16, the housing 5 is mounted on the housing 5, and the limit mounting is completed. The invention has reasonable design, compact structure, short structure length of the lens, convenient carrying, high light transmittance, wide focusing range and low manufacturing cost, is beneficial to ensuring the air distance between lenses, improving the assembly yield, ensuring the stability of an optical axis, reducing the processing difficulty of parts, reducing the assembly requirement, enhancing the vibration resistance and impact resistance of the optical lens part and improving the anti-seismic performance of the whole lens.
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 mechanical athermalization focusing infrared lens is characterized by comprising a lens barrel, wherein a positive lens A, a negative lens B and a positive lens C are sequentially arranged in the lens barrel along the incidence direction of light rays from left to right, the air interval between the positive lens A and the negative lens B is 8.89mm, and the air interval between the negative lens B and the positive lens C is 6.34mm;
three lenses with focal power are arranged in the lens cone;
the lens cone comprises a main lens cone, a mechanical athermalization part is arranged on the main lens cone, the mechanical athermalization part comprises a first telescopic ring and a second telescopic ring which are arranged on the main lens cone, a fixing piece is arranged between the first telescopic ring and the second telescopic ring, a movable seat is further arranged on the main lens cone, a first sealing ring is arranged on the movable seat, a rear baffle ring for fixing the main lens cone and the movable seat is arranged on the main lens cone, and an elastic gasket is further arranged between the movable seat and the rear baffle ring;
the outer side of the main lens barrel is provided with an outer cover, a second sealing ring is arranged on the inner side of the outer cover, the outer cover is provided with a focusing guide pin of the outer cover and the movable seat, the focusing guide pin is provided with a focusing cam, and the second telescopic ring, the fixing piece and the first telescopic ring are sequentially arranged between the outer cover and the main lens barrel;
the radius of curvature of the S1 surface of the positive lens A is 42.32mm, and the radius of curvature of the S2 surface of the positive lens A is 62.56mm; the radius of curvature of the S3 surface of the negative lens B is 13.6mm, and the radius of curvature of the S4 surface of the negative lens B is 18.19mm; the radius of curvature of the S5 surface of the positive lens C was 78.43mm, and the radius of curvature of the S6 surface of the positive lens C was 370.78mm.
2. The infrared lens with the long-wave mechanical athermalization focusing function according to claim 1, wherein the positive lens A, the negative lens B and the positive lens C are all fixed inside the main lens barrel, and a space ring is arranged between the positive lens A and the negative lens B.
3. The infrared lens of claim 2, wherein the positive lens C is provided with a rear pressing ring for fixing the positive lens C to the main barrel, and the negative lens B is provided with a front pressing ring for fixing the negative lens B to the main barrel.
4. The infrared lens of claim 3, wherein the cover is fixedly connected with a fixing screw penetrating through the cover.
5. The infrared lens of claim 4, wherein a limiting ring is arranged between the focusing cam and the main lens barrel.
6. A method of assembling a athermalized focusing infrared lens using a long wave machine according to claim 5, comprising the steps of: (1) Firstly, sequentially placing a positive lens A, a space ring and a negative lens B into the front interior of a main lens cone, and compacting and fixing by using a front pressing ring; (2) Then the positive lens C is arranged in the rear of the main lens barrel and is pressed and fixed by a rear pressing ring; (3) Sequentially fixing the first telescopic ring, the fixing piece and the second telescopic ring outside the main lens barrel, and then installing and fixing the movable seat provided with the first sealing ring on the main lens barrel, so that the first telescopic ring, the fixing piece and the second telescopic ring are positioned between the movable seat and the main lens barrel; (4) After the elastic gasket is arranged on the movable seat, the main lens barrel is fixed on the movable seat by the rear check ring; (5) The second sealing ring is firstly pre-installed on the outer cover, the focusing guide nail penetrating through the outer cover and the movable seat is installed on the outer cover, and the focusing cam is installed on the focusing guide nail; (6) installing a limiting ring between the focusing cam and the movable seat; (7) Finally, the outer cover is covered with a fixing screw, and the assembly is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910507969.0A CN110208920B (en) | 2019-06-12 | 2019-06-12 | Long-wave mechanical athermalization focusing infrared lens and assembly method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910507969.0A CN110208920B (en) | 2019-06-12 | 2019-06-12 | Long-wave mechanical athermalization focusing infrared lens and assembly method thereof |
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| CN110208920A CN110208920A (en) | 2019-09-06 |
| CN110208920B true CN110208920B (en) | 2023-08-15 |
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| CN111722351A (en) * | 2020-06-30 | 2020-09-29 | 福建福光天瞳光学有限公司 | Long-wave electric focusing high-pixel high-resolution infrared lens and assembling method thereof |
| CN111999842A (en) * | 2020-08-30 | 2020-11-27 | 福建福光天瞳光学有限公司 | f35mm mechanical passive athermalization lens and assembling method thereof |
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