CN209979922U - 75mm diffraction surface infrared long-wave optical athermalization lens - Google Patents
75mm diffraction surface infrared long-wave optical athermalization lens Download PDFInfo
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- CN209979922U CN209979922U CN201920879562.6U CN201920879562U CN209979922U CN 209979922 U CN209979922 U CN 209979922U CN 201920879562 U CN201920879562 U CN 201920879562U CN 209979922 U CN209979922 U CN 209979922U
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Abstract
The utility model provides a 75mm diffraction face infrared long wave optics does not have camera lens of heating, including the lens cone, positive lens A, negative 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 positive lens A and the negative lens B is 13mm, and the air interval between negative lens B and the positive lens C is 49.4 mm. The utility model discloses compact structure, convenient to carry can keep under high low temperature state, realizes that optics disappears the fever poor, improves the availability factor, and makes low cost, has the practicality.
Description
Technical Field
The utility model relates to a 75mm diffraction surface infrared long wave optics 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 interfered by battlefield strong light and flash light to cause blindness, can realize remote and all-weather observation, and is particularly suitable for target detection at night and under adverse weather conditions. Modulation Transfer Function (MTF) is a scientific method for analyzing the resolution of a lens.
The temperature not only affects the refractive index of the optical material, but also expands with heat and contracts with cold on the lens barrel material, so that the focal power changes and the optimal image plane shifts. The image is blurred, the contrast is reduced, the optical imaging quality is reduced, and the imaging performance of the lens is finally influenced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses improve above-mentioned problem, promptly the to-be-solved technical problem of the utility model is to provide a 75mm diffraction plane infrared long wave optics does not have the camera lens of heating, can satisfy under the high low temperature condition, realizes the poor purpose of optics heat dissipation, and reduces the camera lens cost.
The utility model discloses a concrete implementation scheme is: the utility model provides a 75mm diffraction surface infrared long wave optics does not have camera lens of heating, includes the lens cone, positive lens A, negative 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 positive lens A and the negative lens B is 13mm, and the air interval between negative lens B and the positive lens C is 49.4 mm.
Furthermore, the positive lens A and the positive lens C are made of chalcogenide material IRG206, and the negative lens B is made of germanium material.
Further, the positive lens A has a focal length f1Negative lens B focal length f2Positive lens C focal length f3The focal length of a system consisting of the positive lens A, the negative lens B and the positive lens C is f, and the proportion of f satisfies: 1.1<f1/f<1.5，-9<f2/f<-6，1.5<f3/f<2.5。
Further, the positive lens a and the positive lens C are aspheric lenses, and the negative lens B is a meniscus lens.
Compared with the prior art, the utility model discloses following beneficial effect has: 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 view of an optical structure according to an embodiment of the present invention;
FIG. 2 is a schematic view of MTF at normal temperature of 20 deg.C in the embodiment of the present invention;
FIG. 3 is a schematic view of the low temperature MTF at-40 deg.C;
FIG. 4 is a schematic view of the high temperature MTF at +80 deg.C;
fig. 5 is a diagram of relative illuminance of an optical system according to an embodiment of the present invention.
In the figure: 1-positive lens a, 2-negative lens B, 3-positive lens C.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
In the present embodiment, as shown in fig. 1 ~ 5, a 75mm diffractive surface infrared long-wavelength optical athermalization lens is provided, which includes a lens barrel, in which a positive lens a1, a negative lens B2 and a positive lens C3 are sequentially disposed from left to right along a light incident direction, an air space between the positive lens a and the negative lens B is 13mm, and an air space between the negative lens B and the positive lens C is 49.4 mm.
In this embodiment, the positive lens a and the positive lens C are made of chalcogenide material IRG206, and the negative lens B is made of germanium material.
The germanium material adopted by the negative lens applies the diffraction optical technology, so that the purposes of reducing the material cost of the lens and eliminating the thermal difference at high and low temperatures can be achieved.
In this embodiment, the focal length of the positive lens a is f1Negative lens B focal length f2Positive lens C focal length f3The focal length of a system consisting of the positive lens A, the negative lens B and the positive lens C is f, and the proportion of f satisfies:
1.1<f1/f<1.5；
-9<f2/f<-6；
1.5<f3/f<2.5。
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 positive lens a and the positive lens C may both be aspheric lenses, and the negative lens B may be a meniscus lens.
Example 2: in addition to embodiment 1, in this embodiment, the optical structure formed by the positive lens a, the negative lens B, and the positive lens C meets the following optical criteria:
(1) the working wave band is as follows: 8um to 12 um;
(2) focal length: f' =75 mm;
(3) relative pore diameter D/f': 1/1
(4) The field angle: 8.26 ° × 6.62 °;
(5) distortion: < 1%;
(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 96.5mm, and the optical back intercept is 10.3 mm.
Example 3: in addition to embodiment 1, in this embodiment, the left surface of the positive lens a is aspheric, the right surface of the positive lens a is aspheric, the left surface of the negative lens B is spherical, the right surface of the negative lens B is diffractive, the left surface of the positive lens C is aspheric, and the right surface of the positive lens C is aspheric.
In this embodiment, the optical element parameter table formed by the positive lens a, the negative lens B and the positive lens C is shown in table 1:
TABLE 1
In the above table, surface numbers S1, S3, and S5 are mirror surfaces of the lenses viewed from left to right, and surface numbers S2, S4, and S6 are mirror surfaces of the lenses viewed from right to left.
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, and a10 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 S4 zemax1r2+ B2r4B3r6) As shown in table 3 below:
TABLE 3
In this embodiment, the light rays sequentially pass through the positive lens a, the negative lens B, and the positive lens C from left to right to form an image. The true book
With novel simple structure, reasonable in design, under high temperature, still can realize optics poor purpose of heat dissipation, and change the material, practice thrift the cost, have the practicality.
Any technical solution disclosed in the present invention is, unless otherwise stated, disclosed a numerical range if it is disclosed, and the disclosed numerical range is a preferred numerical range, and any person skilled in the art should understand that: the preferred ranges are merely those values which are obvious or representative of the technical effect which can be achieved. Because numerical value is more, can't be exhaustive, so the utility model discloses just disclose some numerical values with the illustration the technical scheme of the utility model to, the numerical value that the aforesaid was enumerated should not constitute right the utility model discloses create the restriction of protection scope.
Also, above-mentioned the utility model discloses if disclose or related to mutually fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: 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, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (4)
1. The utility model provides a 75mm diffraction face infrared long wave optics does not have camera lens of heating which characterized in that, includes the lens cone, positive lens A, negative 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 positive lens A and the negative lens B is 13mm, and the air interval between negative lens B and the positive lens C is 49.4 mm.
2. The 75mm diffractive surface infrared optical athermalization lens according to claim 1, wherein the positive lens A and the positive lens C are made of chalcogenide IRG206, and the negative lens B is made of germanium.
3. The 75mm diffractive surface infrared long-wavelength optical athermalizing lens according to claim 2, wherein said positive lens has a focal length of f1Negative lens B focal length f2Positive lens C focal length f3The focal length of a system consisting of the positive lens A, the negative lens B and the positive lens C is f, and the proportion of f satisfies: 1.1<f1/f<1.5，-9<f2/f<-6，1.5<f3/f<2.5。
4. The 75mm diffractive surface infrared long-wavelength optical athermalizing lens according to claim 1 ~ 3, wherein said positive lens A and said positive lens C are aspheric lenses, and said negative lens B is a meniscus lens.
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| CN201920879562.6U CN209979922U (en) | 2019-06-12 | 2019-06-12 | 75mm diffraction surface infrared long-wave optical athermalization lens |
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| CN201920879562.6U CN209979922U (en) | 2019-06-12 | 2019-06-12 | 75mm diffraction surface infrared long-wave optical athermalization lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196486A (en) * | 2019-06-12 | 2019-09-03 | 福建福光天瞳光学有限公司 | A kind of infrared long wave optical of 75mm diffraction surfaces is without thermalization camera lens and imaging method |
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2019
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110196486A (en) * | 2019-06-12 | 2019-09-03 | 福建福光天瞳光学有限公司 | A kind of infrared long wave optical of 75mm diffraction surfaces is without thermalization camera lens and imaging method |
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