CN104199168A - Long-wave infrared optical mechanical hybrid athermal lens unit and assembly method thereof - Google Patents
Long-wave infrared optical mechanical hybrid athermal lens unit and assembly method thereof Download PDFInfo
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- CN104199168A CN104199168A CN201410490072.9A CN201410490072A CN104199168A CN 104199168 A CN104199168 A CN 104199168A CN 201410490072 A CN201410490072 A CN 201410490072A CN 104199168 A CN104199168 A CN 104199168A
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Abstract
The invention discloses a long-wave infrared optical mechanical hybrid athermal lens unit and an assembly method thereof. The long-wave infrared optical mechanical hybrid athermal lens unit mainly comprises an optical system and a telescoping mechanism. The optical system comprises a first lens (901) and a second lens (902). The telescoping mechanism comprises a telescoping tube (701), a retainer ring (707), a first outer lens tube (701), a second outer lens tube (708) and an elastic member (706). The first lens (901) and the second lens (902) are mounted within an inner lens tube (702). The inner lens tube (702) is sleeved with the telescoping tube (710). The retainer ring (707) is fixed on the inner lens tube (702). One end face of the telescoping tube (710) is in contact with one end face of the retainer ring (707). The elastic member (706) is arranged at the other end of the retainer ring (707). The front and rear halves of the telescoping tubes (710) are sleeved with the first outer lens tube (701) and the second outer lens tube (708), respectively. The long-wave infrared optical mechanical hybrid athermal lens unit has the advantages that complexity of the lens unit can be decreased, and the cost of the whole optical system can be decreased.
Description
Technical field
The present invention relates to a kind of IR Passive formula without thermalization camera lens, relate in particular to a kind of LONG WAVE INFRARED optical-mechanical and mix without thermalization camera lens and assembly method thereof.
Background technology
Along with the development of uncooled detector technology and increasingly mature, LWIR Uncooled Optical System is all widely used in dual-use field, meanwhile, also the image quality of optical system has been proposed to more and more higher requirement.Because infrared optical material and mechanical material exist certain thermal effect, the acute variation of working temperature can produce serious influence to optical system, for example, cause degradation under focal length variations, image planes drift, image quality.In order to eliminate or to reduce the impact of the variation of temperature on optical system imaging quality, must adopt corresponding compensation technique, make optical system keep focal length substantially constant in a larger temperature range, thereby guarantee that image quality is good.
At present, in the compensation technique of infrared optical system, be broadly divided into: machinery mixes without thermalization technology without thermalization and optical-mechanical without thermalization, optics.Described machinery, without thermalization technology, is by certain mechanism, to move the drift of a slice or multi-disc lens compensation image planes in essence, according to the difference that realizes displacement mechanism, can be divided into again the active and mechanical passive type of electronics.Described optics is without thermalization technology, is the difference of utilizing between the thermal characteristics of optical material, eliminates the impact of temperature by the reasonable combination of different qualities material.Described optical-mechanical mixes without thermalization technology, the array mode by machinery and optics realize optical system without thermalization.
Existing employing optical-mechanical mixes the infrared optical system without thermalization technology, in lens design process, should consider the thermal characteristics of optical material, must consider that mode by mechanical compensation realizes whole optical system and reaches without thermalization, therefore, the lens construction of design is comparatively complicated, and has increased the manufacturing cost of whole optical system.
Summary of the invention
In view of this, fundamental purpose of the present invention is to provide a kind of LONG WAVE INFRARED optical-mechanical to mix without thermalization camera lens and assembly method thereof, to reduce the complexity of camera lens, and reduces the cost of whole optical system.
For achieving the above object, technical scheme of the present invention is achieved in that
LONG WAVE INFRARED optical-mechanical mixes without a thermalization camera lens, and this camera lens comprises optical system and telescoping mechanism; Described optical system, comprises first lens 901 and the second lens 902; Described telescoping mechanism, comprises retracting cylinder 710, back-up ring 707, the first outer lens barrel 708 of outer lens barrel 701, second and elastomeric element 706; Wherein: described first lens 901 and the second lens 902 are arranged in inner lens cone 702; Described inner lens cone 702 outer cover are provided with retracting cylinder 710, are installed with back-up ring 707 on inner lens cone 702; The end face of retracting cylinder 710 contacts with the end face of described back-up ring 707, and the other end of described back-up ring 707 is provided with an elastomeric element 706; Forward and backward half portion of described retracting cylinder 710 is arranged with respectively the first outer lens barrel 701 and the second outer lens barrel 708.
Wherein: infrared incident light arrives imaging surface 100 by first lens 901, the second lens 902 post-concentrations successively.
Be arranged in inner lens cone 702 first lens 901 and the second lens 902 fixing by the first trim ring 703 and the second trim ring 704 respectively; Described first lens 901 and the second lens 902 are chalcogenide glass.
The convex surface S1 of described first lens 901 is that sphere or aspheric surface, concave surface S2 are aspheric surface or sphere; Convex surface S3, the concave surface S4 of described the second lens 902 are aspheric surface or spherical structure; In one of them concave surface aspheric surface with diffraction surfaces.
Described elastomeric element 706 is wave washer, and described elastomeric element 706 is all the time in pressurized load condition.
Described camera lens front end is provided with O-ring seal, be specially: the first O-ring seal 705 is arranged at the second outer lens barrel 708 outsides, the second O-ring seal 709 is arranged at the junction between the second outer lens barrel 708 and the first outer lens barrel 701, the 3rd O-ring seal 711 is arranged at the junction of the first trim ring 703, inner lens cone 702 and first lens 901, and the 4th O-ring seal 712 is arranged between the first outer lens barrel 701 and inner lens cone 702.
The material of described inner lens cone 702, the outer lens barrel 708 of the outer lens barrel 701, second of back-up ring 707, first, the first trim ring 703, the second trim ring 704 is aluminium alloy, magnesium alloy or stainless steel; The material of retracting cylinder 710 is polyoxymethylene, ABS or nylon.
The expansion coefficient of described retracting cylinder 710 is greater than the expansion coefficient of first outer lens barrel the 701, second outer lens barrel 708.
The fixed focal length of described camera lens is at 10mm to 100mm, and aperture F.NO is between 0.8 to 1.5.
LONG WAVE INFRARED optical-mechanical mixes the assembly method without thermalization camera lens, comprises the steps:
A, retracting cylinder 710 is inserted in to inner lens cone 702, then back-up ring 707 is tightened on inner lens cone 702 by screw thread;
B, elastomeric element 706 is inserted in to inner lens cone 702, until lean against on the end face of back-up ring 707;
C, the second outer lens barrel 708 that the first O-ring seal 705 and the second O-ring seal 709 are installed is enclosed within on retracting cylinder 710, then the first outer lens barrel 701 that the 4th O-ring seal 712 is installed is inserted in to inner lens cone 702 and screws by screw thread and the second outer lens barrel 708;
D, the second lens 902 are arranged in inner lens cone 702 and are fixed by the second trim ring 704;
E, first lens 901 and the 3rd O-ring seal 711 are arranged on inner lens cone 702 and by the first trim ring 703 and are fixed.
LONG WAVE INFRARED optical-mechanical provided by the invention mixes without thermalization camera lens and assembly method thereof, has the following advantages:
This only needs two lens without thermalization camera lens, in conjunction with optics and mechanical compensation way realize in wide temperature range without thermalization function.More existing have following advantage without thermalization scheme: realize optics with multiple optical material proportioning and compare without thermalization scheme, have lens wearer quantity few, use single optical material, simple advantage of lens construction of planting.Compare without thermalization scheme with employing machinery, the present invention is owing to having utilized diffraction optical element to have the feature of reverse dispersion, backlight thermal expansivity in the design of optical system, by reasonable distribution and the coupling of folding, diffraction part focal power, greatly reduce the defocusing amount being caused by temperature difference, thereby also greatly reduced the compensation rate of collocation structure, so more simple and reliable without thermalization than mechanical passive type on collocation structure, there is no the active machinery of electronics without the electronic devices and components of thermalization simultaneously yet.
The lens materials that the present invention adopts is a kind of chalcogenide glass, and in material cost, chalcogenide glass has obvious advantage, and chalcogenide glass can carry out accurate die pressing when producing in enormous quantities, can greatly cut down finished cost, and has wide market outlook.
The present invention adopts optics without thermalization and the mechanical mode combining without thermalization, while having guaranteed that whole optical system changes in ambient temperature certain limit, optical system whole focal length is constant or change very little, thereby keep good image quality, improve the complexity of camera lens simultaneously, reduced whole optical system cost.
Accompanying drawing explanation
Fig. 1 is that the LONG WAVE INFRARED optical-mechanical of the embodiment of the present invention mixes without thermalization lens profile structural representation;
Fig. 2 is without the retracting cylinder perspective view of thermalization camera lens shown in Fig. 1;
Fig. 3 is that shown in Fig. 1, first lens 901 aspheric surfaces without thermalization camera lens add diffraction surfaces schematic diagram;
Fig. 4 be of the present invention without thermalization camera lens the MTF curve map-40 ℃ time;
Fig. 5 be of the present invention without thermalization camera lens the MTF curve map 20 ℃ time;
Fig. 6 be of the present invention without thermalization camera lens the MTF curve map 80 ℃ time.
[critical piece symbol description]
100: imaging surface
701: the first outer lens barrels
702: inner lens cone
703: the first trim rings
704: the second trim rings
705: the first O-ring seals
706: elastomeric element
707: back-up ring
708: the second outer lens barrels
709: the second O-ring seals
710: retracting cylinder
711: the three O-ring seals
712: the four O-ring seals
901: first lens
902: the second lens
S1: the convex surface of first lens 901
S2: the concave surface of first lens 901
S3: the convex surface of the second lens 902
S4: the concave surface of the second lens 902
L1: the length of retracting cylinder 710
L2: the second outer lens barrel 708 arrives the length of S4 central point with the side of retracting cylinder 710 by face.
Embodiment
Below in conjunction with accompanying drawing and embodiments of the invention, LONG WAVE INFRARED optical-mechanical of the present invention is mixed and is described in further detail without thermalization camera lens and assembly method thereof.
Fig. 1 is that the LONG WAVE INFRARED optical-mechanical of the embodiment of the present invention mixes without thermalization lens profile structural representation.Through actual design and checking, the present invention is applicable to focal length at 10mm to 100mm, the infrared tight shot of aperture F.NO between 0.8 to 1.5.This is without thermalization camera lens, mainly comprising that the optical system that consists of two eyeglasses and one have varies with temperature the telescoping mechanism that the drives described optical system compensation mobile mechanical compensation mechanism of thermalization camera lens (without), by this telescoping mechanism, can guarantee when ambient temperature changes within the specific limits, the whole focal length of camera lens is substantially constant, thereby can guarantee image quality clearly.The optical system of described camera lens, mainly comprises first lens 901 and the second lens 902.The telescoping mechanism of described camera lens, mainly comprises retracting cylinder 710 (its spatial structure please refer to Fig. 2), back-up ring 707, the first outer lens barrel 708 of outer lens barrel 701, second and elastomeric element 706.
Fixed focal length take below as 60mm, and the LONG WAVE INFRARED ray machine of aperture F1.25, without the example that is designed to of thermalization camera lens, describes without thermalization camera lens and assembling process of the present invention.This fixed focal length is 60mm, and the LONG WAVE INFRARED ray machine of F1.25, without thermalization camera lens, can adapt to the detector of 640*480/25um, 640*480/17um.
As shown in Figure 1, this LONG WAVE INFRARED ray machine consists of two chalcogenide glasses without the optical system of thermalization camera lens, it is disposed with from the object side to image side along optical axis: have the first lens 901 of positive refractive power, have the second lens 902 and the imaging surface 100 of positive refractive power.Infrared incident light, by first lens 901, enters the second lens 902, finally converges to and reaches image planes 100.The convex surface S1 of described first lens 901 is sphere, and concave surface S2 is aspheric surface, and convex surface S3, the concave surface S4 of described the second lens 902 are non-spherical structure.Wherein in concave surface S2 aspheric surface with diffraction surfaces, as shown in Figure 3.But in actual design, the sphere of first, second lens of camera lens and aspheric position can change, for example, the convex surface S1 of first lens 901 can be that aspheric surface, concave surface S2 can be spheres; The convex surface S3 of described the second lens 902, concave surface S4 can be all spherical structures; In one of them concave surface aspheric surface with diffraction surfaces.
First lens 901 and the second lens 902 are chalcogenide glass, at 8 μ m～12 μ m, have good transmitance, and transparent region covers three atmospheric windows.It is less with respect to other infrared optical material that chalcogenide glass refractive index varies with temperature coefficient d n/dT, in optical system, adopt two chalcogenide glass eyeglasses, and in the concave surface S2 of first lens 901 aspheric surface, diffraction surfaces is set, can utilize diffraction optical element to there is the feature of reverse dispersion, backlight thermal expansivity, adding that rational focal power is distributed significantly reduces the image planes drift value being caused by temperature variation, then coordinate with the flexible physical construction of temperature, can realize good in thermalization function.On processing mode, with the aspheric surface chalcogenide glass eyeglass of diffraction surfaces, can as using the aspherical lens of other material, carry out high precision turning machines, more can utilize the characteristic that its softening temperature is lower to carry out high precision compression molding, the poor efficiency of processing compared to high precision turning and expensive, high precision compression molding has greatly cost advantage when batch production.
Table one: optical component parameter table
Rotational Symmetry even non-spherical surface equation meets following expression formula:
In above formula, Z is aspheric surface along optical axis direction when highly for the position of Y, and apart from the distance rise Sag on aspheric surface summit, R represents the paraxial radius-of-curvature of minute surface, and K is circular cone coefficient conic, and A, B, C, D are high order aspheric surface coefficient.
Table two: aspherical surface data
| Aspheric surface | K | A | B | C | D |
| S2 | 0 | 3.837114E-007 | 9.509908E-012 | 1.386033E-013 | -9.133769E-017 |
| S3 | 0 | -1.130813E-005 | -1.758503E-007 | -1.505173E-012 | 0 |
| S4 | 0 | -1.188269E-006 | -3.132831E-007 | 6.212589E-010 | 0 |
This diffraction surfaces meets following expression formula:
Wherein: ρ=r/r
1, r
1diffraction surfaces naturalization radius, A
iit is diffraction surfaces phase coefficient.
Table three: diffraction surfaces data
| Diffraction surfaces | Planning radius | Phase coefficient A1 | Phase coefficient A2 | Phase coefficient A3 |
| S2 | 22.8 | -63.184674 | 0.204839 | -0.085266 |
Table four: the image planes drift parameter being caused by temperature contrast
| Temperature | -40℃ | -20℃ | 0℃ | 20℃ | 40℃ | 60℃ | 80℃ |
| Image planes drift value (mm) | 0.153 | 0.102 | 0.051 | 0 | -0.051 | -0.102 | -0.153 |
As shown in Figure 1, the present invention, without the mechanical compensation structure of thermalization camera lens, mainly comprises the outer lens barrel 708 of the outer lens barrel 701, second of inner lens cone 702, back-up ring 707, retracting cylinder 710, first, the elastomeric element 706 (for example wave washer) that connect successively from inside to outside.Wherein, in inner lens cone 702, also include the first trim ring 703, the second trim ring 704 for fixing len.Described elastomeric element 706 is all the time in pressurized load condition.
This is mainly comprised of the outer lens barrel 708 of the first outer lens barrel 701, second, retracting cylinder 710, back-up ring 707, elastomeric element 706, inner lens cone 702, the first trim ring 703, the second trim ring 704 and first lens 901 and the second lens 902 without thermalization camera lens.Described first lens 901 and the second lens 902 are arranged in inner lens cone 702, fixing by the first trim ring 703 and the second trim ring 704 respectively; Described inner lens cone 702 outer cover are provided with retracting cylinder 710, by back-up ring 707, are rigidly fixed on inner lens cone 702, and the end face of retracting cylinder 710 contacts with the end face of described back-up ring 707; The other end of back-up ring 707 is provided with an elastomeric element (as wave washer) 706; Outside retracting cylinder 710, be arranged with the first outer lens barrel 701 and the second outer lens barrel 708.The central shaft of the outer lens barrel 708 of described the first outer lens barrel 701, second, retracting cylinder 710, back-up ring 707, elastomeric element 706, inner lens cone 702, the first trim ring 703, the second trim ring 704 and first lens 901 and the second lens 902 is coaxial.
The material of described inner lens cone 702, the outer lens barrel 708 of the outer lens barrel 701, second of back-up ring 707, first, the first trim ring 703, the second trim ring 704 is aluminium alloy, magnesium alloy or stainless steel.The material of elastomeric element 706 is spring steel.The material of retracting cylinder 710 is polyoxymethylene, ABS or nylon.It is benchmark that this mechanical compensation structure be take 20 ℃ of normal temperature, when temperature retracting cylinder 710 when changing for 20 ℃ to-40 ℃ is understood temperature influences and shortens, thereby cause inner lens cone 702 along with the elastic force of wave washer 706, with respect to the outer lens barrel 708 of the first outer lens barrel 701, second, to the direction away from image planes, move.In the time of 20 ℃ to 80 ℃, retracting cylinder 710 temperature influences can extend, thereby cause inner lens cone 702 to overcome the elastic force of wave washer 706, with respect to the outer lens barrel 708 of the first outer lens barrel 701, second, to the direction of approaching image planes, move.The amount of movement Δ L that two kinds of above-mentioned move modes produce is mainly subject to the length L 1 of set retracting cylinder 710, the material expansion coefficient α of retracting cylinder 710
pOM, the second outer lens barrel 708 and retracting cylinder 710 side by face to the outer lens barrel 701 of length L 2, first of the second lens 902 concave surface S4 central points and the material expansion coefficient α of the second outer lens barrel 708
aland with respect to the impact of the temperature difference Δ T of 20 ℃ of normal temperature.Therefore, the image planes drift value that the length L 1 of retracting cylinder 710 and the side of the second outer lens barrel 708 and retracting cylinder 710 are offset corresponding temperature by face to the length L 2 of the concave surface S4 central point of the second lens 902 can be reasonably set according to the image planes drift value in table four.
Can set formula from the above mentioned: amount of movement Δ L=(L1 * u that mechanical-stretching produces
pOM-L2 * u
al) * Δ T.
The length L 1 of set retracting cylinder 710 is 30mm in the present embodiment, and it is 44mm to the length L 2 of the second lens 902 concave surface S4 central points that the second outer lens barrel 708 leans on face with the side of retracting cylinder 710.Can check in the material expansion coefficient α of retracting cylinder 710 simultaneously
pOMbe 1.2 * 10
-4/ ℃, the material expansion coefficient α of the first outer lens barrel 701 and the second outer lens barrel 708
albe 2.36 * 10
-5/ ℃.Visible, the expansion coefficient of described retracting cylinder 710 is greater than the expansion coefficient of first outer lens barrel the 701, second outer lens barrel 708.
According to above-mentioned formula and with respect to the temperature difference Δ T of 20 ℃ of normal temperature, can calculate the compensation rate parameter in table five.According in the realistic simulation at optical design software ZEMAX, the compensation rate of this mechanical compensation structure can effectively prevent that the image planes drift situation that optical system temperature influence produces from occurring, thereby guaranteed the image quality of camera lens under temperature difference, the visible Fig. 4 of imaging effect under concrete high and low temperature and normal temperature, the MTF curve map of Fig. 5, Fig. 6.MTF curve map has represented the comprehensive resolving power of optical system, by Fig. 4, Fig. 5, Fig. 6 can find out this LONG WAVE INFRARED ray machine without thermalization camera lens by optics and machinery mixed compensation after, the MTF curve of high low temperature is little with respect to the MTF curvilinear motion of normal temperature, can meet the resolution energy requirement at-40 ℃ to+80 ℃ temperature to camera lens completely.
Table five: the compensation rate being produced by temperature contrast mechanical compensation structure
| Temperature | -40℃ | -20℃ | 0℃ | 20℃ | 40℃ | 60℃ | 80℃ |
| Image planes drift value (mm) | 0.153 | 0.102 | 0.051 | 0 | -0.051 | -0.102 | -0.153 |
Camera lens front end of the present invention is provided with O-ring seal, has certain sealing.As shown in Figure 1, described O-ring seal comprises the first O-ring seal 705, the second O-ring seal 709, the 3rd O-ring seal 711 and the 4th O-ring seal 712.Wherein: the first O-ring seal 705 is arranged at the second outer lens barrel 708 outsides, the second O-ring seal 709 is arranged at the junction between the second outer lens barrel 708 and the first outer lens barrel 701, the 3rd O-ring seal 711 is arranged at the junction of the first trim ring 703, inner lens cone 702 and first lens 901, and the 4th O-ring seal 712 is arranged between the first outer lens barrel 701 and inner lens cone 702.LONG WAVE INFRARED optical-mechanical of the present invention is without thermalization camera lens, simple in structure, easy to assembly, and camera lens front end has good waterproof sealing effect.
LONG WAVE INFRARED optical-mechanical of the present invention, without the assembling process of thermalization camera lens, mainly comprises the following steps:
Step 1: retracting cylinder 710 is inserted in to inner lens cone 702, then back-up ring 707 is tightened on inner lens cone 702 by screw thread.
Step 2: elastomeric element (as wave washer) 706 is inserted in to inner lens cone 702, until lean against on the end face of back-up ring 707.
Step 3: the second outer lens barrel 708 that the first O-ring seal 705 and the second O-ring seal 709 are installed is enclosed within on retracting cylinder 710, then the first outer lens barrel 701 that the 4th O-ring seal 712 is installed is inserted in to inner lens cone 702 and screws by screw thread and the second outer lens barrel 708.
Step 4: the second lens 902 are arranged on inner lens cone 702 and by the second trim ring 704 and are fixed.
Step 5: first lens 901 and the 3rd O-ring seal 711 are arranged on inner lens cone 702 and by the first trim ring 703 and are fixed.
It should be noted that, design parameter in embodiments of the invention form is only exemplary, the parameter of each lens and the length of compensating cylinder are not limited to the shown value of each numerical value of the embodiment of the present invention, also can adopt other value, but all can reach same or similar technique effect.Mechanical compensation structure of the present invention also has more than the application being limited in the optical system of this camera lens, in other similar optical systems, also can reach identical compensation effect.
The above, be only preferred embodiment of the present invention, is not intended to limit protection scope of the present invention.
Claims (10)
1. LONG WAVE INFRARED optical-mechanical mixes without a thermalization camera lens, it is characterized in that, this camera lens comprises optical system and telescoping mechanism; Described optical system, comprises first lens (901) and the second lens (902); Described telescoping mechanism, comprises retracting cylinder (710), back-up ring (707), the first outer lens barrel (701), the second outer lens barrel (708) and elastomeric element (706); Wherein: described first lens (901) and the second lens (902) are arranged in inner lens cone (702); Described inner lens cone (702) outer cover is provided with retracting cylinder (710), is installed with back-up ring (707) on inner lens cone (702); The end face of retracting cylinder (710) contacts with the end face of described back-up ring (707), and the other end of described back-up ring (707) is provided with an elastomeric element (706); Forward and backward half portion of described retracting cylinder (710) is arranged with respectively the first outer lens barrel (701) and the second outer lens barrel (708).
2. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, infrared incident light arrives imaging surface (100) by first lens (901), the second lens (902) post-concentration successively.
3. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, be arranged on the middle first lens (901) of inner lens cone (702) and the second lens (902) fixing by the first trim ring (703) and the second trim ring (704) respectively; Described first lens (901) and the second lens (902) are chalcogenide glass.
4. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, the convex surface S1 of described first lens (901) is that sphere or aspheric surface, concave surface S2 are aspheric surface or sphere; Convex surface S3, the concave surface S4 of described the second lens (902) are aspheric surface or spherical structure; In one of them concave surface aspheric surface with diffraction surfaces.
5. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, described elastomeric element (706) is wave washer, and described elastomeric element (706) is all the time in pressurized load condition.
6. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, described camera lens front end is provided with O-ring seal, be specially: the first O-ring seal (705) is arranged at the second outer lens barrel (708) outside, the second O-ring seal (709) is arranged at the junction between the second outer lens barrel (708) and the first outer lens barrel (701), the 3rd O-ring seal (711) is arranged at the first trim ring (703), the junction of inner lens cone (702) and first lens (901), the 4th O-ring seal (712) is arranged between the first outer lens barrel (701) and inner lens cone (702).
7. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, the material of described inner lens cone (702), back-up ring (707), the first outer lens barrel (701), the second outer lens barrel (708), the first trim ring (703), the second trim ring (704) is aluminium alloy, magnesium alloy or stainless steel; The material of retracting cylinder (710) is polyoxymethylene, ABS or nylon.
8. LONG WAVE INFRARED optical-mechanical mixes without thermalization camera lens according to claim 1, it is characterized in that, the expansion coefficient of described retracting cylinder (710) is greater than the expansion coefficient of the first outer lens barrel (701), the second outer lens barrel (708).
9. according to the arbitrary described LONG WAVE INFRARED optical-mechanical of claim 1～8, mix without thermalization camera lens, it is characterized in that, the fixed focal length of described camera lens is at 10mm to 100mm, and aperture F.NO is between 0.8 to 1.5.
10. LONG WAVE INFRARED optical-mechanical mixes the assembly method without thermalization camera lens, it is characterized in that, comprises the steps:
A, retracting cylinder (710) is inserted in to inner lens cone (702), then back-up ring (707) is tightened on inner lens cone (702) by screw thread;
B, elastomeric element (706) is inserted in to inner lens cone (702), until lean against on the end face of back-up ring (707);
C, that the second outer lens barrel (708) that the first O-ring seal (705) and the second O-ring seal (709) will be installed is enclosed within retracting cylinder (710) is upper, then the first outer lens barrel (701) that the 4th O-ring seal (712) will be installed is inserted in inner lens cone (702) and screws by screw thread and the second outer lens barrel (708);
D, the second lens (902) are arranged in inner lens cone (702) and are fixed by the second trim ring (704);
E, first lens (901) and the 3rd O-ring seal (711) are arranged on to inner lens cone (702) go up and pass through the first trim ring (703) and be fixed.
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