CN210514767U - Long-wave infrared large-aperture zoom lens - Google Patents
Long-wave infrared large-aperture zoom lens Download PDFInfo
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- CN210514767U CN210514767U CN201921275581.4U CN201921275581U CN210514767U CN 210514767 U CN210514767 U CN 210514767U CN 201921275581 U CN201921275581 U CN 201921275581U CN 210514767 U CN210514767 U CN 210514767U
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Abstract
The utility model provides an infrared large aperture zoom of long wave, including the main lens cone, the main lens cone is inside to have set gradually first positive meniscus lens, first negative meniscus lens and the positive meniscus lens of second from left right incident direction along light, the air interval between first positive meniscus lens and the first negative meniscus lens is 37.5mm, the air interval control range between first negative meniscus lens and the positive meniscus lens of second is 31.3mm ~33.2 mm. The utility model has the characteristics of the electronic focusing of large aperture, camera lens simple structure, the compactness, in addition, for overcoming the influence of temperature to infrared camera lens imaging performance, through the air space focus between electronic focusing adjustment lens, make infrared optical system can keep good imaging quality in a great temperature range, have the novelty.
Description
Technical Field
The utility model relates to an infrared large aperture zoom of long wave.
Background
Under the impact of larger temperature difference, the imaging quality of the optical system is greatly reduced due to the expansion or contraction of lens materials and mechanical parts and the increase or decrease of the refractive index of the lens materials, especially for infrared optical systems. With the wider and wider application range of the infrared optical lens, in many application occasions, the working temperature change range of the infrared lens is large, and a user needs to be able to focus the lens, so that the infrared optical system can keep good imaging quality in a large temperature range.
There are two types of athermal methods used in infrared optical systems: optical athermalization and electrokinetic athermalization. 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 can not meet the requirements of clients, so that the long-wave infrared large-aperture electric focusing lens uses the electric athermalization to ensure that the optical system can keep good imaging quality in a larger temperature range. Although the long-wave infrared large-aperture electric focusing lens is provided with the electric focusing mechanism, the structural design is optimized as much as possible in the design of the main lens cone, so that the cost is reduced, and the lens structure is easy to process, assemble and can be produced in batches.
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 long wave infrared large aperture zoom lens, simple structure and formation of image are effectual.
The utility model discloses a concrete implementation scheme is: the first positive meniscus lens, the first negative meniscus lens and the second positive meniscus lens are sequentially arranged in the main lens barrel along the incident 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 between the first negative meniscus lens and the second positive meniscus lens is within the adjusting range of 31.3 mm-33.2 mm.
Furthermore, the first positive meniscus lens and the second positive meniscus lens are made of long-wave single crystal germanium.
Furthermore, the first negative meniscus lens is made of chalcogenide glass.
Furthermore, the right surface of the first positive meniscus lens is an aspheric surface, and the left surface of the second positive meniscus lens is an aspheric surface.
Further, the aspheric surfaces of the first positive meniscus lens and the second positive meniscus lens satisfy the following expressions:
(ii) a Where c =1/R, Z is a distance rise from a vertex of the aspherical surface when the aspherical surface is at a position having a height R in the optical axis direction, R represents a paraxial radius of curvature of the mirror surface, K is a conic coefficient, and A, B, C, D is a high-order aspherical coefficient.
Furthermore, the first positive meniscus lens and the second positive meniscus lens are sequentially arranged inside the front part and the rear part of the main lens cone, an inner lens cone movably matched with the main lens cone is arranged in the middle of the main lens cone, a pressing ring A used for pressing and fixing the first positive meniscus lens in the main lens cone 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 cone 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 cone is arranged on the second positive meniscus lens.
Furthermore, the main lens cone comprises a focusing group, the focusing group comprises a focusing cam, a motor frame is mounted on the rear side portion of the main lens cone, a motor is mounted on the motor support, a driving gear matched with the focusing cam is arranged on an output shaft of the motor, a pair of guide nails which penetrate through the main lens cone and the inner lens cone and are driven by the rotation of the focusing cam to move are arranged on two sides of the main lens cone, and brass space rings are arranged outside the guide nails.
Compared with the prior art, the utility model discloses following beneficial effect has: this device compact structure, reasonable in design has the characteristics of the electronic focusing of large aperture, and camera lens simple structure is compact, in addition, for overcoming the influence of temperature to infrared camera lens imaging performance, through the air interval focus between electronic focusing adjustment lens, makes infrared optical system can keep good imaging quality in a great temperature range.
Drawings
Fig. 1 is a schematic view of an optical structure according to an embodiment of the present invention;
fig. 2 is a first schematic structural diagram of an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the embodiment of the present invention.
In the figure: 1-main lens cone, 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 cone, 10-pressing ring A, 11-pressing ring B, 12-pressing ring C, 13-driving gear, 14-guide nail, 15-brass space ring and 16-limit switch.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example 1: as shown in fig. 1 to 3, in the present 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 inside the main lens barrel 1 along a left-to-right incident direction of light, an air interval between the first positive meniscus lens and the first negative meniscus lens is 37.5mm, and an air interval adjustment range between the first negative meniscus lens and the second positive meniscus lens is 31.3mm to 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 surface of the first positive meniscus lens is an aspheric surface, and the left surface of the second positive meniscus lens is an aspheric surface.
In this embodiment, the aspheric surfaces of the first positive meniscus lens and the second positive meniscus lens satisfy the following expressions:
；
where c =1/R, Z is a distance rise from a vertex of the aspherical surface when the aspherical surface is at a position having a height R in the optical axis direction, R represents a paraxial radius of curvature of the mirror surface, K is a conic coefficient, and A, B, C, D is a high-order aspherical coefficient.
In this embodiment, the first positive meniscus lens and the second positive meniscus lens are sequentially mounted inside the front and rear of the main barrel, the inner barrel 9 movably fitted with the main barrel is disposed in the middle of the main 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 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 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 barrel.
In this embodiment, the main barrel 1 includes a focusing group 5, the focusing group 5 includes a focusing cam 6, a motor frame 7 is installed on the rear side portion of the main barrel, a motor 8 is installed on the motor frame, a driving gear 13 matched with the focusing cam is arranged on the output shaft of the motor, a pair of guide pins 14 which penetrate through the main barrel and the inner barrel and are driven by the rotation of the focusing cam to move are arranged on two sides of the main barrel, and a brass space ring 15 is arranged outside each guide pin.
In this embodiment, the inner side of the main barrel 1 is provided with a guiding straight slot, and the side of the inner barrel is matched with the guiding straight slot and drives the inner barrel to move back and forth along the guiding straight slot under the rotation of the focusing cam.
In this embodiment, the inner barrel 1 is provided with the vent hole, so that when the inner barrel moves back and forth, the inner barrel cannot move due to the extrusion of air inside the inner barrel, and smooth focusing can be ensured without clamping stagnation.
In this embodiment, a limit switch 16 is disposed at a side of the main barrel.
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 performing focusing of the optical system. The device adopts a structural form of +/-and has the characteristic of large-aperture electric focusing, the lens has a 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 among the 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 above table, S1, S3, and S5 are the left surfaces of the first positive meniscus lens, the first negative meniscus lens, and the second positive meniscus lens, respectively, and S2, S4, and S6 are the right surfaces 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) the working wave band is as follows: 8-12 μm;
(2) focal length: f' =75.0 mm;
(3) a detector: the long-wave infrared non-refrigeration type 640 x 480, 17 μm;
(4) the field angle: 5.48 ° (H) x 3.76 ° (V);
(5) relative pore diameter D/f': 1/1.0;
(6) the total length of the optical system is 89.8 mm.
In this embodiment, this camera lens can match with long wave infrared uncooled type 640 x 48017 um detector for multiple platforms such as airborne and land carry out tasks such as temperature measurement, security protection control.
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 (7)
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 incident 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.
2. The long-wave infrared large-aperture zoom lens according to 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 is made of 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 aspheric and the left side of the second positive meniscus lens is aspheric.
5. The long-wave infrared large-aperture zoom lens according to claim 1, wherein aspheric surfaces on the first positive meniscus lens and the second positive meniscus lens satisfy the following expression:
；
where c =1/R, Z is a distance rise from a vertex of the aspherical surface when the aspherical surface is at a position having a height R in the optical axis direction, R represents a paraxial radius of curvature of the mirror surface, K is a conic coefficient, and A, B, C, D is a high-order aspherical coefficient.
6. The long-wave infrared large-aperture zoom lens according to claim 1, wherein the first positive meniscus lens and the second positive meniscus lens are sequentially mounted inside the main barrel, an inner barrel movably fitted with the main barrel is provided in the middle of the main barrel, a pressing ring a for pressing and fixing the first positive meniscus lens in the main barrel is provided on the first positive meniscus lens, a pressing ring B for pressing and fixing the first negative meniscus lens in the inner barrel is provided on the first negative meniscus lens, and a pressing ring C for pressing and fixing the second positive meniscus lens in the main barrel is provided on the second positive meniscus lens.
7. The long-wave infrared large-aperture zoom lens according to claim 1, wherein the main lens barrel comprises a focusing group, the focusing group comprises a focusing cam, a motor frame is mounted on a rear side portion of the main lens barrel, a motor is mounted 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 pins penetrating through the main lens barrel and the inner lens barrel and driven by the rotation of the focusing cam to move are arranged on two sides of the main lens barrel, and brass space rings are arranged outside the guide pins.
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| CN201921275581.4U CN210514767U (en) | 2019-08-08 | 2019-08-08 | Long-wave infrared large-aperture zoom lens |
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| CN201921275581.4U CN210514767U (en) | 2019-08-08 | 2019-08-08 | Long-wave infrared large-aperture zoom lens |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412753A (en) * | 2019-08-08 | 2019-11-05 | 福建福光天瞳光学有限公司 | LONG WAVE INFRARED large aperture zoom lens and its focus adjustment method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110412753A (en) * | 2019-08-08 | 2019-11-05 | 福建福光天瞳光学有限公司 | LONG WAVE INFRARED large aperture zoom lens and its focus adjustment method |
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