CN208902949U - A kind of lens barrel structure improving infrared lens modulation transfer functions - Google Patents
A kind of lens barrel structure improving infrared lens modulation transfer functions Download PDFInfo
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- CN208902949U CN208902949U CN201821900755.7U CN201821900755U CN208902949U CN 208902949 U CN208902949 U CN 208902949U CN 201821900755 U CN201821900755 U CN 201821900755U CN 208902949 U CN208902949 U CN 208902949U
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- lens barrel
- glasses
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Abstract
The utility model relates to a kind of lens barrel structure, specifically a kind of lens barrel structure for improving infrared lens modulation transfer functions belongs to infrared lens technical field.It includes glasses for infrared use, lens barrel and pressing ring, is successively arranged glass installation step and glass positioning step in lens barrel, and the axial line of glass installation step and glass positioning step and lens barrel is on same straight line；Glasses for infrared use are arranged on glass positioning step, and glasses for infrared use side wall contacts glass positioning step side wall；Deformation gap, filled silicon rubber layer in deformation gap are equipped between the glass installation step side wall and glasses for infrared use side wall.The utility model both ensure that the light axis consistency of lens optical glass installation, solve two kinds of delicate influences of different materials thermal expansion coefficient difference bring camera lens again, it can be realized quick assembling, infrared lens modulation transfer functions value is effectively raised, ensure that equipment complete machine stability and reliability under high and low temperature environment.
Description
Technical field
The utility model relates to a kind of lens barrel structure, specifically a kind of mirror for improving infrared lens modulation transfer functions
Barrel structure belongs to infrared lens technical field.
Background technique
Amount transmission function (MTF) be indicate the sinusoidal intensity distribution functions of various different frequencies after optical system imaging its
The attenuation degree of contrast (i.e. amplitude).Mtf value is the acutance to camera lens, and contrast and resolution ratio carry out the numerical value of overall merit,
It is an overall target for embodying optical system superiority and inferiority.Therefore the height of the mtf value of camera lens directly affects instrument overall performance
Quality.
For infrared lens infrared glass should be able to well with mirror head outer shell material phase sealing-in, therefore thermal expansion coefficient
It matches.Due to the particularity of infrared optical system, the glass material of camera lens generallys use germanite glass, zinc sulphide, zinc selenide etc.,
And mirror head outer shell material generallys use the conventional materials such as aluminium alloy, magnesium alloy.Two kinds of different materials thermal expansion systems of glass and metal
Several difference just causes optical glass deformation, and optical system generates variation, to influence the modulation transfer functions of camera lens
(MTF).
The mounting means usual method of infrared lens in equipment on Active Duty has 2 kinds.Method 1: as shown in Figure 1, by infrared
Optical glass 1 is fitted into the glass installation step 3 of transition fit in lens barrel 2, is directly pressed glasses for infrared use 1 by pressing ring 4
It tightly in lens barrel 2, is influenced by different materials thermal expansion coefficient is different, the camera lens of this method assembly glass when high/low temperature uses
By stress deformation, optical system is caused to change, properties of product decline even generates glass rupture, therefore the camera lens when serious
It can only use at normal temperature.Method 2: as shown in Fig. 2, the glass that glasses for infrared use 1 are fitted into transition fit in lens barrel 2 is installed
In step 3,1 circumference of glasses for infrared use and 3 side wall of glass installation step fill silicon rubber there are the gap 0.5mm in the gap
The fixed glasses for infrared use 1 of layer 6, are pressed in lens barrel 2 after glue is dry by pressing ring 4.Since silastic-layer 6 has certain bullet
Property, camera lens high/low temperature using when glasses for infrared use 1 itself deformation be transferred on silastic-layer 6, stress will not be generated and drawn
That rises is severely deformed.But because different eyeglasses and the gap barrel 0.5mm are difficult to control, it is easy to produce eccentricity of glasses lens, optical axis is inconsistent
The phenomenon that, therefore the MFT value of camera lens is influenced, or even product overall performance is caused to decline.
Summary of the invention
In place of the purpose of this utility model is to overcome above-mentioned deficiency, to provide a kind of raising infrared lens modulus transmitting
The lens barrel structure of function, improves the modulation transfer functions of infrared optical lens, to improve the complete machine that equipment is taken aim in infrared sight
Energy.
According to technical solution provided by the utility model, a kind of lens barrel structure packet improving infrared lens modulation transfer functions
Glasses for infrared use, lens barrel and pressing ring are included, it is characterized in that: glass installation step and glass positioning step are successively arranged in lens barrel,
The axial line of glass installation step, glass positioning step and lens barrel is on same straight line；Glasses for infrared use are arranged in glass
On positioning step, and glasses for infrared use side wall contacts glass positioning step side wall；The glass installation step side wall and red
Deformation gap, filled silicon rubber layer in deformation gap are equipped between outer optical glass side wall；It is connected through a screw thread in the lens barrel
Glasses for infrared use are pressed on glass positioning step by pressing ring, pressing ring.
Further, deformation gap numerical value is B, B 0.5mm.
Further, glasses for infrared use bottom sides are equipped with glass chamfering.
Further, elastic adhesive tape is equipped between pressing ring and glasses for infrared use.
Further, the depth value of glass positioning step is A, A≤0.5mm.
Compared with the prior art the utility model has the advantage that
The utility model structure is simple, compact, reasonable, and the utility model both ensure that the optical axis of lens optical glass installation
Consistency, and solve two kinds of delicate influences of different materials thermal expansion coefficient difference bring camera lens, it can be realized fast quick-mounting
Match, effectively raise infrared lens modulation transfer functions value, ensure that equipment under high and low temperature environment complete machine stability with can
By property；It is found through experiment that infrared lens modulation transfer functions value can improve 6% or so using the structure compared with conventional structure.
Detailed description of the invention
Fig. 1 is the first installation diagram of infrared lens in the prior art.
Fig. 2 is second of installation diagram of infrared lens in the prior art.
Fig. 3 is the utility model semi-cutaway.
Fig. 4 is enlarged view at I in Fig. 3.
Description of symbols: 1- glasses for infrared use, 2- lens barrel, 3- glass installation step, 4- pressing ring, 5- elastic adhesive tape,
6- silastic-layer, 7- glass positioning step, 8- glass chamfering.
Specific embodiment
The utility model will be further described in conjunction with the embodiment in attached drawing below:
As shown in Fig. 3 ~ 4, the utility model mainly includes glasses for infrared use 1, lens barrel 2 and pressing ring 4.In lens barrel 2 successively
Equipped with glass installation step 3 and glass positioning step 7, the axial line of glass installation step 3, glass positioning step 7 and lens barrel 2 exists
On same straight line.
Glasses for infrared use 1 are arranged on glass positioning step 7, and the contact glass positioning of 1 side wall of glasses for infrared use
7 side wall of step is installed by the centering that glass positioning step 7 completes glasses for infrared use 1.
The depth value of the glass positioning step 7 is A, the smaller glasses for infrared use 1 of the value of A≤0.5mm, A and lens barrel 2
The contact area of side wall is smaller, and infrared lens modulation transfer functions are higher.
It is equipped with the deformation gap that numerical value is B between 3 side wall of glass installation step and 1 side wall of glasses for infrared use, becomes
Filled silicon rubber layer 6 in shape gap.The B is 0.5mm.Silastic-layer 6 is present to ensure that the infrared optics under high and low temperature environment
Glass 1 is not by the stress influence of lens barrel 2.
1 bottom sides of glasses for infrared use are equipped with glass chamfering 8, and glass chamfering 8 can facilitate glasses for infrared use 1
Installation on glass positioning step 7.
Pressing ring 4 is connected through a screw thread in lens barrel 2, glasses for infrared use 1 are pressed on glass positioning step 7 by pressing ring 4.
It is equipped with elastic adhesive tape 5 between the pressing ring 4 and glasses for infrared use 1, avoids pressing ring 4 from damaging by pressure by elastic adhesive tape 5
Glasses for infrared use 1.
The mounting means of the utility model is: glasses for infrared use 1 is pressed into first in the glass positioning step 7 of lens barrel 2,
1 side wall of glasses for infrared use is pressed into contact with 7 side wall of glass positioning step.Then in glasses for infrared use 1 and glass erecting bed
Filling silicon rubber forms silastic-layer 6 between 3 side wall of rank.It finally screws in pressing ring 4 glasses for infrared use 1 are pressed in lens barrel.
The utility model structure is simple, compact, reasonable, and the utility model both ensure that the optical axis of lens optical glass installation
Consistency, and solve two kinds of delicate influences of different materials thermal expansion coefficient difference bring camera lens, it can be realized fast quick-mounting
Match, effectively raise infrared lens modulation transfer functions value, ensure that equipment under high and low temperature environment complete machine stability with can
By property；It is found through experiment that infrared lens modulation transfer functions value can improve 6% or so using the structure compared with conventional structure.
Claims (5)
1. a kind of lens barrel structure for improving infrared lens modulation transfer functions, including glasses for infrared use (1), lens barrel (2) and pressure
It encloses (4), it is characterized in that: being successively arranged glass installation step (3) and glass positioning step (7), glass installation step in lens barrel (2)
(3), the axial line of glass positioning step (7) and lens barrel (2) is on same straight line；Glasses for infrared use (1) are arranged in glass
On positioning step (7), and glasses for infrared use (1) side wall contacts glass positioning step (7) side wall；The glass installation step
(3) deformation gap, filled silicon rubber layer (6) in deformation gap are equipped between side wall and glasses for infrared use (1) side wall；The mirror
It is connected through a screw thread pressing ring (4) in cylinder (2), glasses for infrared use (1) are pressed on glass positioning step (7) by pressing ring (4).
2. a kind of lens barrel structure for improving infrared lens modulation transfer functions as described in claim 1, it is characterized in that: the change
Shape gap numerical value is B, B 0.5mm.
3. a kind of lens barrel structure for improving infrared lens modulation transfer functions as described in claim 1, it is characterized in that: described red
Outer optical glass (1) bottom sides are equipped with glass chamfering (8).
4. a kind of lens barrel structure for improving infrared lens modulation transfer functions as described in claim 1, it is characterized in that: the pressure
It encloses between (4) and glasses for infrared use (1) and is equipped with elastic adhesive tape (5).
5. a kind of lens barrel structure for improving infrared lens modulation transfer functions as described in claim 1, it is characterized in that: the glass
The depth value of glass positioning step (7) is A, A≤0.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821900755.7U CN208902949U (en) | 2018-11-19 | 2018-11-19 | A kind of lens barrel structure improving infrared lens modulation transfer functions |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821900755.7U CN208902949U (en) | 2018-11-19 | 2018-11-19 | A kind of lens barrel structure improving infrared lens modulation transfer functions |
Publications (1)
| Publication Number | Publication Date |
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| CN208902949U true CN208902949U (en) | 2019-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821900755.7U Active CN208902949U (en) | 2018-11-19 | 2018-11-19 | A kind of lens barrel structure improving infrared lens modulation transfer functions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254377A (en) * | 2018-11-19 | 2019-01-22 | 江苏北方湖光光电有限公司 | A kind of lens barrel structure improving infrared lens modulation transfer functions |
-
2018
- 2018-11-19 CN CN201821900755.7U patent/CN208902949U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109254377A (en) * | 2018-11-19 | 2019-01-22 | 江苏北方湖光光电有限公司 | A kind of lens barrel structure improving infrared lens modulation transfer functions |
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