CN207488595U - A kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens - Google Patents
A kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens Download PDFInfo
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- CN207488595U CN207488595U CN201721437486.0U CN201721437486U CN207488595U CN 207488595 U CN207488595 U CN 207488595U CN 201721437486 U CN201721437486 U CN 201721437486U CN 207488595 U CN207488595 U CN 207488595U
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Abstract
The utility model discloses a kind of passive mechanical compensation solar heat protection defocus structure of wide temperature range of infrared lens, including：First support, second support, third stent, lens barrel, lens set, detector, each eyeglass of lens set is fixed in lens barrel, detector is fixed by screw and first support, and first support is fixed by screw and second support, and second support is fixed by screw and third stent；Wherein, first support material is aluminium, and second support selects the big nonmetallic materials of coefficient of thermal expansion, and third stent selects the small material of coefficient of thermal expansion, three stents are mutually overlapped in camera lens axial direction top split-phase, and " Z " font connection being formed on camera lens longitudinal profile.It is rationally designed by first support, second support and third stent, mechanical structure stroke under high/low temperature can be made identical with image planes amount of movement under high/low temperature, realize that infrared temperature variation causes the compensation of imaging image planes change in location.This structural volume is small, light-weight, adaptation more wide environmental temperature requirement.
Description
Technical field
The utility model is related to a kind of infrared lens without thermalization collocation structure, and in particular to a kind of wide temperature of infrared lens
The passive mechanical compensation solar heat protection defocus structure of range.
Background technology
The hot defocus that some camera lenses can not be generated using the difference between material thermal characteristics come compensation optical system, in order to make
Infrared lens blur-free imaging needs a kind of passive mechanical compensation solar heat protection defocus structure of infrared lens.
Conventional IR Passive mechanical compensation solar heat protection defocus structure volume is big, complicated, weight is big, and Acclimation temperature range
It is small, it is compensating material poor performance at low temperatures, of high cost, present infrared lens miniaturization, low cost, lightweight and wide ring can not have been met
Border thermal adaptability requirement.
Utility model content
In view of this, the utility model provides a kind of passive mechanical compensation solar heat protection defocus of wide temperature range of infrared lens
Structure, small, light-weight, adaptation more wide environmental temperature claimed range, low cost.
A kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens, including：First support, second
Frame, third stent, lens barrel, lens set, detector, each eyeglass of lens set are fixed in lens barrel, detector by screw with
First support is fixed, and first support is fixed by screw and second support, and second support is fixed by screw and third stent, mirror
Cylinder is fixed positioned at third internal stent by screw and third stent；Wherein, first support material is aluminium, and second support selects heat
The quantitative levels of the coefficient of expansion are more than 10-5Nonmetallic materials, third stent select coefficient of thermal expansion quantitative levels be less than 10-5Material, three stents mutually overlapping type of attachment of composition part in camera lens axial direction.
Preferably, both first support and second support front end are connected, and both second support and third stent rear end are connected；
Axial restraint is used between first support, second support, third stent, lens barrel, detector.
Preferably, second support material is engineering plastics (TPEE), and third stent material is invar.
Preferably, first support coordinates with lens barrel for small―gap suture, to ensure that detector and lens barrel are same in temperature changing process
Axis；It is respectively clearance fit between first support and second support, second support and third stent, to ensure temperature changing process
Middle axial movement is smooth；Third stent coordinates with lens barrel for small―gap suture, to ensure that detector and lens barrel are same in temperature changing process
Axis.
Preferably, the third stent is bell-mouth structure of air form, and both ends of the surface are equipped with threaded hole, and front opening is circle
Structure is fixed by screw and lens barrel cooperation, and open rearward end is square structure, is fixed by screw and second support, rear end is opened
Mouth left and right sides are machined with resigning oblique angle；Third stent front and back end is connected by two reinforcing ribs, is machined with and is subtracted among reinforcing rib
Repeated hole.
Preferably, lens barrel front end is bell-mouth structure of air, and centre is square structure, and rear end is cylindrical structure, intermediate rectangular
Structure is camera lens external interface.
Preferably, the second support is tubular construction, and front end is in-flanges structure, and front end surface is machined with countersunk head
Hole, and connect with first support；Rear end upper and lower ends face is flanging structure, and is machined with counter sink, and is connected with third stent
It connects, rear end left and right sides are machined with resigning oblique angle.
Preferably, the first support is tubular construction, and four side of front end is flanging structure, and front end face is threaded
Hole, and connect with second support；Four side of its rear end is in-flanges structure, and rear end face is threaded hole, and is connect with detector,
First support back-end central hole periphery is machined with ladder platform, preferably to reduce system veiling glare.
Preferably, first support, second support, the length of third stent and its respective coefficient of thermal expansion meet such as ShiShimonoseki
System：l1×a1-l2×a2+l3×a3=a4,
Wherein, l1×a1-l2×a2+l3×a3Detector is with respect to room temperature and the last one eyeglass of lens set during-temperature change
Distance change amount；
a4- image planes rate of travel；
l1- first support total length；
a1- first support coefficient of thermal expansion；
l2- second support total length；
a2- second support coefficient of thermal expansion；
l3- third total stent length；
a3- third stent coefficient of thermal expansion.
Preferably, first support, second support, third stent use tower structure.
Advantageous effect
(1) structure is compensated only with level-one, uses Multilevel compensating mode compared to other similar structures, the structure is simpler
List, volume smaller, reliability higher, assembly process process are more preferable, manufacture cost is lower.
(2) second support uses TPEE, and third stent uses invar；Compared with conventional selection, not only meet low temperature use
It is required that and corresponding part length shorten more than ten times so that the lightweight and miniaturization of total are achieved.
(3) three stents are using end to end mode, and between three stents and between lens barrel and detector
Using axial restraint, so as to reduce axial space.Hole processing is on the part of effective compensation length, third stent 3 and mirror
Gap has been reserved in cylinder junction, is adjusted available for detector rear cut-off distance, can both reduce part processing request, save cost, also
It can compensate for processing, assemble and bring error.
(4) lens barrel front end is bell-mouth structure of air, and centre is square structure, and rear end is cylindrical structure, intermediate square structure
For camera lens external interface, external shafting is directly fixed with lens barrel, reduces a ring frame, has carried out sufficient lightweight, small-sized
Change design.
Description of the drawings
Fig. 1 is the assembling figure of the utility model structure.
Fig. 2 is the vertical axis internal view of the utility model structure.
Fig. 3 is first support.
Fig. 4 is second support.
Fig. 5 is third stent.
Wherein, 1- lens barrels, 2- second supports, 3- thirds stent, 4- detectors, 5- lens sets, 6- first supports.
Specific embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
The utility model provides a kind of passive mechanical compensation solar heat protection defocus structure of wide temperature range of infrared lens, referring to
Attached drawing 1-2, including：Lens barrel 1, second support 2, third stent 3, detector 4, lens set 5, first support 6.
5 each eyeglass of lens set is fixed in lens barrel 1, and detector 4 is fixed by screw and first support 6, first
Frame 6 is fixed by screw and second support 2, and second support 2 is fixed by screw and third stent 3, and third stent 3 passes through screw
It is fixed with lens barrel 1 on its interior.6 material of first support is aluminium, and second support 2 selects the big (quantitative levels of coefficient of thermal expansion
More than 10-5) nonmetallic materials, the present embodiment select engineering plastics (TPEE), third stent 3 select coefficient of thermal expansion it is small (number
Measure grade and be less than 10-5) material, it is invar that the present embodiment, which selects material, and three stents composition part in camera lens axial direction is mutual
Overlapping connection forms the connection of " Z " font that is, on vertical axis sectional view, i.e. first support 6 is located at 2 inside of second support and the two
Front end is connected, and second support 2 is located at third internal stent and the two rear end is connected.The structure is compensated only with level-one, compared to it
He uses Multilevel compensating mode by similar structures, the structure is simpler, volume smaller, reliability higher, assembly process process are more preferable,
It is lower to manufacture cost.
First support 6, second support 2, third stent 3 using tower structure, have stronger intensity, rigidity, can
Applied to HI high impact, big vibration level environment.
Wherein, first support 16 coordinates with lens barrel 1 for small―gap suture, it is ensured that detector 4 and lens barrel 1 in temperature changing process
Coaxially.It is clearance fit between first support 6 and second support 2 and second support 2 and third stent 3, it is ensured that temperature change
It is axially moved in the process smooth.Third stent 3 and lens barrel 1 coordinate for small―gap suture, it is ensured that in temperature changing process detector 4 and
Lens barrel 1 is coaxial.It by the rational design of first support 6, second support 2, third stent 3, can stretch mechanical structure under high/low temperature
Contracting amount is identical with image planes amount of movement under high/low temperature, realizes that infrared temperature variation causes the compensation of imaging image planes change in location.
As shown in figure 3, first support 6 is tubular construction, four side of front end is flanging structure, and end face is threaded hole,
It is connect with second support 2, and front end bore size is poor to add；Rear end is in-flanges structure, and end face is threaded hole, with detection
Device 4 connects, and back-end central is machined with ladder platform around hole, can preferably reduce system veiling glare.According to system requirements, first support
6 select conventional material, preferably aluminium.
As shown in figure 4, second support 2 is tubular construction, front end is in-flanges structure, and end face is machined with counter sink, with the
One stent 6 connects, and front end bore size is poor to add；Rear end upper and lower ends face is flanging structure, and left and right sides are machined with
Resigning oblique angle, upper and lower ends face are machined with counter sink, are connect with third stent 3, and rear end bore size is poor to add.According to system
It is required that second support 2 selects the big nonmetallic materials of coefficient of thermal expansion, preferably TPEE.TPEE brittle points are less than -70 DEG C, high temperature
200 DEG C can be used for a long time, and coefficient of thermal expansion is up to 180 × 10-5/℃).Conventional compensating material is ABS (- 40 DEG C of brittle point temperature, heat
The coefficient of expansion 10 × 10-5/ DEG C), nylon 1010 (- 60 DEG C of brittle point temperature, coefficient of thermal expansion 10.5 × 10-5/ DEG C), polyformaldehyde it is (crisp
- 40 DEG C of temperature of point, coefficient of thermal expansion 11 × 10-5/ DEG C) etc. materials, low temperature requirement is unsatisfactory for, if selecting other compensation
Material, corresponding part length need to increase by 15 times of length or so, be highly detrimental to lightweight and the Miniaturization Design of total.This
Outside, second support 2 is used to meet under HI high impact, big vibration level environment, has been carried out structure enhancing to part, has been manufactured the part
When be added to high strength fibre, under the premise of material thermal expansion coefficient is not influenced, improve the strength and stiffness of part.
As shown in figure 5, third stent 3 is bell-mouth structure of air form, both ends trepanning is big, and there is screw thread in the end face of two trepannings
Hole, front opening are circular configuration, and are coordinated with lens barrel 1, and dimensional tolerance H7 is fixed by screw and lens barrel；Open rearward end
For square structure, size adds difference, is fixed by screw and second support 2, and open rearward end left and right sides are machined with resigning oblique angle；
Front and back end is connected by two reinforcing ribs, and lightening hole is machined among reinforcing rib.By finite element analysis software, part is not interfered with
Intensity can also mitigate pts wt significantly, make entire product more lightweight, miniaturization.According to system requirements, third stent 3
The material for selecting coefficient of thermal expansion small, preferably invar.Invar coefficient of thermal expansion 1.5 × 10-6/ DEG C), the expansion of conventional material aluminothermy
Coefficient 2.3 × 10-5/ DEG C, ordinary steel coefficient of thermal expansion 10 × 10-6/ DEG C or so, such as using conventional material, corresponding part length is extremely
It reduces and adds 6 times or so, be highly detrimental to lightweight and the Miniaturization Design of total.
Lens barrel front end is bell-mouth structure of air, and centre is square structure, and rear end is cylindrical structure, and intermediate square structure is mirror
Head external interface, turntable shafting external in this way can be fixed directly by intermediate square structure with lens barrel, reduce a ring frame,
Sufficient lightweight, Miniaturization Design are carried out.
Further, axial restraint side is used between lens barrel, first support 6, second support 2, third stent 3, detector
Formula connects, and to reduce axial space, hole processing is on the part of effective compensation length, third stent 3 and lens barrel junction
Gap has been reserved, has been adjusted available for detector rear cut-off distance, can both be reduced part processing request, save cost, can also compensate for
Processing, assembling bring error.
Wherein, each stent length meets following relationship with coefficient of thermal expansion：
l1*a1-l2*a2+l3*a3=a4, wherein：a4- image planes amount of movement, l16 total length of-first support, a1- the first
6 coefficient of thermal expansion of frame, l22 total length of-second support, a22 coefficient of thermal expansion of-second support, l33 total length of-third stent,
a33 coefficient of thermal expansion of-third stent.l1、l2、l3It is part both ends of the surface distance, parts size precision and processing are easier to protect
Card, practical compensation effect is more accurate, and imaging is more clear.
Formula principle is explained below：First, l on the left of formula1*a1For 6 expansion length of first support, l2*a2It is
Two stents, 2 expansion length, l3*a3For 3 expansion length of third stent；In addition, it is overlapping due to there is part between three stents, i.e.,
The connection relation of " Z " font, therefore the expansion length l of second support 22*a2, direction and first support 6 and third stent 3
Therefore expansion length direction in axial coordinate on the contrary, be denoted as negative value, i.e.-l2*a2；To sum up, three stents are swollen in axial coordinate
The summation of swollen length is l1*a1-l2*a2+l3*a3；
In addition, since lens set and stent are relatively fixed, the summation " l of stent expansion length1*a1-l2*a2+l3*a3”
As image planes rate of travel a4, thus obtain above-mentioned equation：l1*a1-l2*a2+l3*a3=a4；
In the utility model, by by the coefficient of thermal expansion a of second support 22What is set is larger, and first support 6
Coefficient of thermal expansion a1With the coefficient of thermal expansion a of third stent 33What is set is relatively small, by reasonable disposition, can make l1*a1-l2*
a2+l3*a3The amount of movement for causing focal plane when high/low temperature changes with eyeglass is identical to get to " passive machinery is mended in wide temperature range
Repay solar heat protection defocus " technique effect.
6 material of the utility model first support is aluminium, and 2 material of second support is TPEE, and 3 material of third stent is invar,
By rationally designing structural member length and material selection, it can be achieved that blur-free imaging, environment are fitted in -50 DEG C~+70 DEG C temperature ranges
Should be able to power it is stronger, imaging it is more stable.
In conclusion the above is only the preferred embodiments of the present utility model only, it is not intended to limit the utility model
Protection domain.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on should all wrap
Containing being within the protection scope of the utility model.
Claims (10)
1. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens, which is characterized in that including：First
Frame (6), second support (2), third stent (3), lens barrel (1), lens set (5), detector (4), each eyeglass of the lens set (5)
It is fixed in lens barrel (1), detector (4) is fixed by screw and first support (6), and first support (6) passes through screw and second
Stent (2) is fixed, and second support (2) is fixed by screw and third stent (3), and lens barrel (1) is logical inside third stent (3)
It is fixed with third stent (3) to cross screw；Wherein, first support (6) material is aluminium, and second support (2) selects coefficient of thermal expansion
Quantitative levels are more than 10-5Nonmetallic materials, third stent select coefficient of thermal expansion quantitative levels be less than 10-5Material, three
A stent mutually overlapping type of attachment of composition part in camera lens axial direction.
2. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：Both first support (6) and second support (2) front end are connected, after second support (2) and third stent (3) the two
End is connected；Axial restraint is used between first support (6), second support (2), third stent (3), lens barrel (1), detector (4).
3. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：Second support (2) material is engineering plastics (TPEE), and third stent (3) material is invar.
4. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：First support (6) coordinates with lens barrel (1) for small―gap suture, to ensure detector in temperature changing process (4) and lens barrel
(1) it is coaxial；It is respectively clearance fit between first support (6) and second support (2), second support (2) and third stent (3),
It is smooth to ensure to be axially moved in temperature changing process；Third stent (3) coordinates with lens barrel (1) for small―gap suture, to ensure temperature
Detector (4) and lens barrel (1) are coaxial in change procedure.
5. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：The third stent (3) is bell-mouth structure of air form, and both ends of the surface are equipped with threaded hole, and front opening is tied to be round
Structure is fixed by screw and lens barrel (1) cooperation, and open rearward end is square structure, fixed by screw and second support (2), after
End opening left and right sides are machined with resigning oblique angle；Third stent (3) front and back end is connected by two reinforcing ribs, is added among reinforcing rib
Work has lightening hole.
6. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：Lens barrel (1) front end is bell-mouth structure of air, and centre is square structure, and rear end is cylindrical structure, intermediate square structure
For camera lens external interface.
7. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：The second support (2) is tubular construction, and front end is in-flanges structure, and front end surface is machined with counter sink, and
It is connect with first support (6)；Rear end upper and lower ends face is flanging structure, and is machined with counter sink, and with third stent (3) even
It connects, rear end left and right sides are machined with resigning oblique angle.
8. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：The first support (6) is tubular construction, and four side of front end is flanging structure, and front end face is threaded hole,
And it is connect with second support (2)；Four side of its rear end is in-flanges structure, and rear end face is threaded hole, and with detector (4) even
It connects, first support (6) back-end central hole periphery is machined with ladder platform, preferably to reduce system veiling glare.
9. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：First support (6), second support (2), the length of third stent (3) and its respective coefficient of thermal expansion meet such as
Lower relationship：l1×a1-l2×a2+l3×a3=a4,
Wherein, l1×a1-l2×a2+l3×a3Detector (4) is with respect to room temperature and lens set (5) the last one mirror during-temperature change
The distance change amount of piece；
a4- image planes rate of travel；
l1- first support (6) total length；
a1- first support (6) coefficient of thermal expansion；
l2- second support (2) total length；
a2- second support (2) coefficient of thermal expansion；
l3- third stent (3) total length；
a3- third stent (3) coefficient of thermal expansion.
10. a kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens according to claim 1,
It is characterized in that：First support (6), second support (2), third stent (3) use tower structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721437486.0U CN207488595U (en) | 2017-11-01 | 2017-11-01 | A kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721437486.0U CN207488595U (en) | 2017-11-01 | 2017-11-01 | A kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens |
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| Publication Number | Publication Date |
|---|---|
| CN207488595U true CN207488595U (en) | 2018-06-12 |
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ID=62478591
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|---|---|---|---|
| CN201721437486.0U Active CN207488595U (en) | 2017-11-01 | 2017-11-01 | A kind of passive mechanical compensation solar heat protection defocus structure of the wide temperature range of infrared lens |
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| Country | Link |
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| CN (1) | CN207488595U (en) |
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- 2017-11-01 CN CN201721437486.0U patent/CN207488595U/en active Active
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