CN212675207U - 8.4mm large-view-field infrared long-wave optical athermalization lens - Google Patents
8.4mm large-view-field infrared long-wave optical athermalization lens Download PDFInfo
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- CN212675207U CN212675207U CN202021845529.0U CN202021845529U CN212675207U CN 212675207 U CN212675207 U CN 212675207U CN 202021845529 U CN202021845529 U CN 202021845529U CN 212675207 U CN212675207 U CN 212675207U
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Abstract
The utility model provides an infrared long wave optics of 8.4mm big visual field do not have camera lens of heating, including the lens cone, negative lens A, positive lens B and positive lens C have set gradually from the left hand right side along light incidence direction in the lens cone, the air interval between negative lens A and the positive lens B is 16.323mm, and the air interval between positive lens B and the positive lens C is 7.472 mm. The invention has compact structure, convenient carrying, low manufacturing cost and practicability, can realize optical heat difference elimination and improve the use efficiency under the high-temperature use state.
Description
Technical Field
The utility model relates to an infrared long wave optics of 8.4mm big visual field does not have camera lens of heating.
Background
With the development of scientific technology, the infrared imaging technology has been widely applied in the fields of national defense, industry, medical treatment, electric power detection and the like, and has wide application prospect and use value. The infrared detection has certain capabilities of penetrating smoke, fog, haze, snow and the like and recognizing camouflage, is not blinded by strong light and flash interference in a battlefield, can realize long-distance and all-weather observation, and is particularly suitable for target detection at night and under adverse weather conditions.
The temperature not only can cause the influence to the refracting index of optical material but also can cause expend with heat and contract with cold to the lens barrel material, causes the focal power change and best image plane to take place the skew, and the image is fuzzy, and the contrast descends, reduces optical imaging quality, finally influences the imaging performance of camera lens. At present, a zinc selenide material is generally adopted as a lens material of the infrared long-wave optical athermalization lens, and the cost of the product is higher due to the fact that the zinc selenide material is expensive.
Disclosure of Invention
The utility model discloses improve above-mentioned problem, promptly the to-be-solved technical problem of the utility model is that current temperature difference causes focal power to change and best image plane to take place the skew, reduces optical imaging quality.
The utility model discloses a concrete implementation scheme is: the utility model provides an infrared long wave optics of 8.4mm large-visual-field does not have heat altered camera lens, includes the lens cone, negative lens A, positive lens B and positive lens C have set gradually from left to right along the light incidence direction in the lens cone, the air interval between negative lens A and the positive lens B is 16.323mm, and the air interval between positive lens B and the positive lens C is 7.472 mm.
Furthermore, the negative lens A is made of germanium material, and the positive lens B and the positive lens C are made of chalcogenide material IRG 206.
Further, the negative lens A has a focal length f1Positive lens B having focal length f2Positive lens C focal length f3The focal length of a system consisting of the negative lens A, the positive lens B and the positive lens C is f, and the proportion of f satisfies: -1.6< f1/f<-1.5，1.3< f2/f<1.5，4.5< f3/f<5.4。
Further, the negative lens a and the positive lens C are aspheric lenses, and the positive lens B is a diffractive surface lens.
Further, the distance between the positive lens C and the image plane is 8.395 mm.
Compared with the prior art, the invention has the following beneficial effects: the device has compact structure and reasonable design, can realize the purpose of poor optical heat dissipation at higher temperature, is convenient to carry and operate, improves the use efficiency, reduces the manufacturing cost and has practicability.
Drawings
FIG. 1 is a schematic diagram of an optical structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of MTF at 20 ℃ and normal temperature in accordance with an embodiment of the present invention;
FIG. 3 is a schematic view of the MTF at-40 deg.C;
FIG. 4 is a schematic view of MTF at-60 deg.C;
in the figure: 1-negative lens A, 2-positive lens B, 3-positive lens C, 4-image plane window.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example (b): as shown in fig. 1 to 4, in the present embodiment, an 8.4mm large-field-of-view infrared long-wavelength optical athermalization lens is provided, which includes a lens barrel, a negative lens a, a positive lens B and a positive lens C are sequentially disposed in the lens barrel from left to right along a light incidence direction, an air interval between the negative lens a and the positive lens B is 16.323mm, and an air interval between the positive lens B and the positive lens C is 7.472 mm.
In this embodiment, the negative lens A is made of germanium material, and the positive lens B and the positive lens C are made of chalcogenide material IRG 206.
The glass system material adopted by the positive lens B applies a diffraction optical technology, so that the material cost of the lens can be reduced, and the aim of eliminating the thermal difference at high and low temperatures is fulfilled.
In this embodiment, the focal length of the negative lens a is f1Positive lens B having focal length f2Positive lens C focal length f3The focal length of a system consisting of the negative lens A, the positive lens B and the positive lens C is f, and the proportion of f satisfies:
-1.6< f1/f<-1.5；
1.3< f2/f<1.5；
4.5< f3/f<5.4。
the proportion condition is met, and the aberration of the lens in the wavelength range of 8-12 um can be reasonably corrected and balanced.
In this embodiment, the negative lens a and the positive lens C may both be aspheric lenses, and the positive lens B may be a diffractive lens.
Example 2: in addition to example 1, in this example, the optical structure formed by the negative lens a, the positive lens B, and the positive lens C achieved the following optical indices:
(1) the working wave band is as follows: 8um to 12 um;
(2) focal length: f' =8.4 mm;
(3) relative pore diameter D/f': 1/1.1
(4) The field angle: 71.5 ° × 58.2 ° × 88.6 °;
(5) distortion: < 15%;
(6) resolution ratio: can meet the requirements of long-wave infrared non-refrigeration type 640 multiplied by 512 and 17 mu m;
(7) the total length of the optical path is less than or equal to 44.6mm, and the optical back intercept is 10.4 mm.
Example 3: in addition to embodiment 1, in this embodiment, the right surface of the negative lens a is aspheric, the left surface of the positive lens B is spherical, the right surface of the positive lens B is a diffraction surface, and the left surface of the positive lens C is aspheric.
In this embodiment, the optical element parameter table formed by the negative lens a, the positive lens B and the positive lens C is shown in table 1, wherein S1, S2 and S3 … identify the distance between the surface and the next surface center at intervals according to the surface parameters of the negative lens a, the positive lens B and the positive lens C from left to right along the incident direction of light rays:
TABLE 1
In this embodiment, the aspherical surface satisfies the following formula:
；
wherein, Z is the distance from the vertex of the aspheric surface to the height r when the aspheric surface reaches the position with the height r along the optical axis direction;
c =1/r, r represents the paraxial radius of curvature of the mirror surface, and k is the conic coefficient;
a2, a4, a6, A8, a10, a12, and a14 are high-order aspheric coefficients.
The table of high order aspheric coefficients is shown in table 2 below:
TABLE 2
In this example, the phase distribution function = M (B) in the diffraction plane S3, zemax1r2) The normalized radius was 10.75, B1= -42.95823.
In this embodiment, the light rays sequentially pass through the negative lens a, the positive lens B, and the positive lens C from left to right to form an image. The utility model discloses simple structure, reasonable in design under the high temperature, still can realize optics poor purpose of heat that disappears, and changes the material, practices thrift the cost, has the practicality.
Any embodiment disclosed herein above is meant to disclose, unless otherwise indicated, all numerical ranges disclosed as being preferred, and any person skilled in the art would understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Since the numerical values are too numerous to be exhaustive, some of the numerical values are disclosed in the present invention to illustrate the technical solutions of the present invention, and the above-mentioned numerical values should not be construed as limiting the scope of the present invention.
Meanwhile, if the invention as described above discloses or relates to parts or structural members fixedly connected to each other, the fixedly connected parts can be understood as follows, unless otherwise stated: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
If the terms "first," "second," etc. are used herein to define parts, those skilled in the art will recognize that: the terms "first" and "second" are used merely to distinguish one element from another in a descriptive sense and are not intended to have a special meaning unless otherwise stated.
In addition, terms used in any technical solutions disclosed in the present invention to indicate positional relationships or shapes include approximate, similar or approximate states or shapes 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 examples are only used to illustrate the technical solutions of the present invention and not to limit the same; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.
Claims (5)
1. The 8.4mm large-view-field infrared long-wave optical athermalization lens is characterized by comprising a lens barrel, wherein a negative lens A, a positive lens B and a positive lens C are sequentially arranged in the lens barrel from left to right along the light incidence direction, the air interval between the negative lens A and the positive lens B is 16.323mm, and the air interval between the positive lens B and the positive lens C is 7.472 mm.
2. The 8.4mm large-field-of-view infrared long-wave optical athermalization lens of claim 1, wherein the negative lens A is made of germanium material, and the positive lens B and the positive lens C are made of chalcogenide material IRG 206.
3. The 8.4mm large-field-of-view infrared long-wave optical athermalization lens according to claim 2, wherein the focal length of the negative lens A is f1, the focal length of the positive lens B is f2, the focal length of the positive lens C is f3, and the focal length of a system consisting of the negative lens A, the positive lens B and the positive lens C is f, and the ratio thereof is as follows: 1.1< f1/f <1.5, -9< f2/f < -6, 1.5< f3/f < 2.5.
4. The 8.4mm large-field-of-view infrared long-wave optical athermalization lens according to any one of claims 1 to 3, wherein the negative lens A and the positive lens C are aspheric lenses, and the positive lens B is a diffractive surface lens.
5. The 8.4mm large-field-of-view infrared long-wave optical athermalization lens according to any one of claims 1 to 3, wherein the distance between the positive lens C and the image plane is 8.395 mm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111999783A (en) * | 2020-08-30 | 2020-11-27 | 福建福光天瞳光学有限公司 | 8.4mm large-field-of-view infrared long-wave optical athermalization lens and imaging method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111999783A (en) * | 2020-08-30 | 2020-11-27 | 福建福光天瞳光学有限公司 | 8.4mm large-field-of-view infrared long-wave optical athermalization lens and imaging method |
| CN111999783B (en) * | 2020-08-30 | 2023-11-14 | 福建福光天瞳光学有限公司 | 8.4mm large-view-field infrared long-wave optical athermalization lens and imaging method |
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