CN207232479U - A kind of iris diaphgram light modulating device of Piezoelectric Driving - Google Patents
A kind of iris diaphgram light modulating device of Piezoelectric Driving Download PDFInfo
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- CN207232479U CN207232479U CN201721000212.5U CN201721000212U CN207232479U CN 207232479 U CN207232479 U CN 207232479U CN 201721000212 U CN201721000212 U CN 201721000212U CN 207232479 U CN207232479 U CN 207232479U
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Abstract
The utility model discloses a kind of iris diaphgram light modulating device of Piezoelectric Driving, device includes iris diaphgram, piezoelectric actuator and pedestal.Piezoelectric actuator includes four cantilever beams and eight piezoelectric ceramics；Four cantilever beams use metallic elastic matrix, join end to end to form square loop girder construction；The midpoint of four cantilever beam inner walls is equipped with the driving foot with the outer wall of iris diaphgram moving-coil interference fit；Eight piezoelectric ceramics are correspondingly arranged on the outer wall of four cantilever beam midpoints both sides respectively.During work, apply the pumping signal that phase difference is 90 ° to the two panels piezoelectric ceramics on every beam, elliptic motion is produced at driving foot, driving moving-coil rotates, and then drives diaphragm piece to rotate by moving-coil, realizes the expansion or contraction of clear aperature.The utility model uses Piezoelectric Driving, and flat structure is compact, small, light-weight, degree of regulation is high, response is fast, reliability is high, is conducive to improve the performance of optical instrument and reduces production cost.
Description
Technical field
It the utility model is related to optical instrument field, and in particular to a kind of iris diaphgram light modulating device of Piezoelectric Driving.
Background technology
In order to control the luminous energy received on photodetector target surface, ensure that imaging illumination is suitable, must be into optical instrument
Row light modulation.Iris diaphgram light modulation is common light-dimming method, it is realized by iris diaphgram light modulating device.Iris diaphgram tune
Electro-optical device is generally made of iris diaphgram and drive part.Iris diaphgram is mainly enclosed surely including diaphragm piece, diaphragm moving-coil and diaphragm.
The relative rotation that diaphragm moves, encloses surely can drive the rotation of diaphragm piece, and then change the size of the clear aperature surrounded by diaphragm piece.
Drive part is rotated according to the illumination requirement of light or the watt level driving diaphragm moving-coil of light, by continuously adjusting diaphragm thang-kng
Aperture achievees the purpose that light modulation.The precision of light modulation directly affects or even the precision and cost of decision optical device, and the essence dimmed
Degree is mainly related with the degree of regulation of iris diaphgram.Existing iris diaphgram light modulating device be mostly designed, designed processing or with mark
Quasi-optical door screen restructuring, drive part uses electromagnetic machine and Worm Wheel System or gear drive more, and usual structure is complex,
There are problems that transmission accuracy is low, frictional force is big, service life is short, high processing costs, cycle are long low with reliability etc..
Piezoelectric actuator is a kind of New Type of Actuator, elastomer is produced supersonic frequency using the inverse piezoelectric effect of piezoelectric
Vibration in section, by the rubbing action between elastomer and rotor, the macroscopic motion of direct output rotor.With traditional electromagnetism electricity
Machine is compared, piezoelectric actuator have it is simple and compact for structure, can directly export low-speed big, response is rapid, does not produce magnetic field, is fixed
Position precision is high and the particular advantages such as cut off self-lock, and has been widely used in aerospace, biologic medical and optical precision instrument etc.
Field.
Utility model content
Technical problem to be solved in the utility model is to be directed to the defects of involved in background technology, there is provided one kind pressure
Electrically driven (operated) iris diaphgram light modulating device.
The utility model uses following technical scheme to solve above-mentioned technical problem：
A kind of iris diaphgram light modulating device of Piezoelectric Driving, including iris diaphgram, stop screw, piezoelectric actuator, pedestal
With three fixing screws, the iris diaphgram, piezoelectric actuator, pedestal are coaxially disposed；
The iris diaphgram includes moving-coil, fixed circle and some diaphragm pieces；
The moving-coil and Ding Quan are hollow cylinder of the bottom surface for annular shape, and the fixed circle is co-axially located in moving-coil；
Described equal one end of diaphragm piece is equipped with and its connected fixing pin, and the other end is equipped with what can be freely rotated with respect to it
Movable pin；
The one-to-one mounting hole of some and described diaphragm piece fixing pin is uniformly provided with the moving-coil bottom surface, it is described fixed
Circle is uniformly provided with the one-to-one sliding groove of some and described diaphragm piece activity pin on bottom surface；
Described diaphragm piece one end is hinged by its corresponding mounting hole on fixing pin and the moving-coil, and the other end passes through work
Dynamic pin is installed in described its upper corresponding sliding groove of fixed circle；
Surely the post jamb enclosed is equipped with encloses fixed thread through hole surely；It is circumferential on the outer wall of the moving-coil to be equipped with limiting slot；
The piezoelectric actuator includes first to fourth cantilever beam and the first to the 8th piezoelectric ceramics；
First to fourth cantilever beam uses metallic elastic matrix, joins end to end to form square loop girder construction, just
Chamfered is made at four angles of Q-RING girder construction, is radially equipped with one of angle and the stop screw matches
Spacing tapped through hole, be radially equipped with the fixed thread through hole to match with the fixing screws on its excess-three angle；
The midpoint of the first to fourth cantilever beam inner wall is equipped with driving foot, and the driving of first to fourth cantilever beam
The outer wall interference fit of sufficient and described moving-coil, the moving-coil is fixed in square loop girder construction；
The stop screw sequentially passes through the spacing tapped through hole, limiting slot and the circle fixed thread through hole whorl surely
Connection, for fixing the fixed circle and being engaged with the limiting slot to limit the rotational angle of the moving-coil；
Described first to the 8th piezoelectric ceramics is correspondingly arranged on the outer wall of first to fourth cantilever beam midpoint both sides respectively,
And first to the 8th piezoelectric ceramics equal through-thickness polarization, polarization direction are identical；
The pedestal is in hollow cylindrical, and post jamb is equipped with and three fixed thread through holes one in square loop girder construction
One corresponding tapped through hole, is fixedly linked by three fixing screws and the square loop girder construction, for axial branch
Support the iris diaphgram.
As a kind of further prioritization scheme of iris diaphgram light modulating device of Piezoelectric Driving of the utility model, the metal
The material selection beryllium-bronze of elastic matrix.
As a kind of further prioritization scheme of iris diaphgram light modulating device of Piezoelectric Driving of the utility model, described first
Adopt and be correspondingly arranged in the method for paste on the outer wall of first to fourth cantilever beam midpoint both sides to the 8th piezoelectric ceramics.
The utility model compared with prior art, has following technique effect using above technical scheme：
1. the utility model light-dimming method is simple, device has the characteristics that flat structure is compact, small and light-weight,
The work(such as space photograph, Space-Based Radar and space measurement are realized especially suitable for the spacecraft most valuable to space and weight
Energy；
2. piezoelectric actuator utilizes the inverse piezoelectric effect of piezoelectric ceramics, the microdeformation of material is put by mechanical resonance
Greatly, the macroscopic motion of rotor is converted into by the coupled drive that rubs, drives and uses frictional drive between foot and moving-coil, can power off
Self-locking, and there is larger holding moment of torsion, therefore the light modulating device of the utility model has higher reliability；
In addition, the positioning accuracy of piezoelectric actuator is high, be conducive to improve the resolution ratio of optical instrument.According to piezoelectric actuator
Own characteristic, its response time is in millisecond rank, so piezoelectric actuator is no inertia when moving back and forth, diaphragm tune
Speed of photoresponse is fast, therefore the utility model is also especially suitable for electro-optical tracking and pointing system, in remote motion target tracking
During will not lose target；
3. the utility model dimming scope is big, can be made according to the piezoelectricity of the Demand Design corresponding size of different thang-kng diameters
Dynamic device.The utility model is completed on the basis of existing iris diaphgram structure, can directly use commercially available diaphragm, structure
Flexible design, the process-cycle is short, and production cost is low, applied widely；
Produced 4. two mode that piezoelectric actuator utilizes are vibrated by deflection of beam, on the one hand, piezoelectric ceramics configures and electricity
Motivational techniques are simple, on the other hand, using the higher flexural vibrations of girder construction vibration efficiency, improve the energy of piezoelectric actuator
Utilization ratio and output torque, ensure the stability that iris diaphgram light modulating device is adjusted.
Brief description of the drawings
Fig. 1 is a kind of structure diagram of the iris diaphgram light modulating device for the Piezoelectric Driving that the utility model is related to；
Fig. 2 is piezoelectric actuator structure diagram described in the utility model；
Fig. 3 is the schematic diagram of piezoelectric actuator operation mode described in the utility model, wherein, Fig. 3 (a) is the single order by beam
The mode that bending vibration is formed, Fig. 3 (b) is the mode formed by the second order bending vibration of beam.
In figure, 1- iris diaphgrams, 11- moving-coils, 12- encloses surely, 2- fixing screws, 3- piezoelectric actuators, the first cantilevers of 31-
Beam, the second cantilever beams of 32-, the first piezoelectric ceramics of 33-, the second piezoelectric ceramics of 34-, the 3rd piezoelectric ceramics of 35-, the 4th piezoelectricity of 36-
Ceramics, 37- driving foots, 4- pedestals, 5- stop screws.
Embodiment
The technical solution of the utility model is described in further detail below in conjunction with the accompanying drawings：
The utility model can be embodied in many different forms, and should not be assumed that to be limited to the embodiments described herein.
On the contrary, thesing embodiments are provided so that the disclosure is thorough and complete, and this reality will be given full expression to those skilled in the art
With new scope.In the accompanying drawings, for the sake of clarity it is exaggerated component.
It will be appreciated that though term first, second, third, etc., which may be used herein, describes each element, component and/or portion
Point, but these elements, component and/or part should not be limited by these terms.These terms be used only for by element, component and/or
Part mutually distinguishes.Therefore, the first element discussed below, component and/or part are imparted knowledge to students without departing substantially from the utility model
On the premise of can become the second element, component or part.
As shown in Figure 1, the utility model discloses a kind of iris diaphgram light modulating device of Piezoelectric Driving, including can darkening
Door screen, stop screw, piezoelectric actuator, pedestal and three fixing screws, the iris diaphgram, piezoelectric actuator, pedestal are coaxially set
Put；
The iris diaphgram includes moving-coil, fixed circle and some diaphragm pieces；
The moving-coil and Ding Quan are hollow cylinder of the bottom surface for annular shape, and the fixed circle is co-axially located in moving-coil；
Described equal one end of diaphragm piece is equipped with and its connected fixing pin, and the other end is equipped with what can be freely rotated with respect to it
Movable pin；
The one-to-one mounting hole of some and described diaphragm piece fixing pin is uniformly provided with the moving-coil bottom surface, it is described fixed
Circle is uniformly provided with the one-to-one sliding groove of some and described diaphragm piece activity pin on bottom surface；
Described diaphragm piece one end is hinged by its corresponding mounting hole on fixing pin and the moving-coil, and the other end passes through work
Dynamic pin is installed in described its upper corresponding sliding groove of fixed circle；
Surely the post jamb enclosed is equipped with encloses fixed thread through hole surely；
It is circumferential on the outer wall of the moving-coil to be equipped with limiting slot.
When moving-coil and Ding Quan relatively rotate, the movable pin of diaphragm on piece will be promoted, diaphragm piece is then with fixation
Pin is branch spot wobble, the relative rotation enclosed with moving-coil and surely and change clear aperature.
As shown in Fig. 2, the piezoelectric actuator includes first to fourth cantilever beam and the first to the 8th piezoelectric ceramics；
First to fourth cantilever beam uses metallic elastic matrix, joins end to end to form square loop girder construction, just
Chamfered is made at four angles of Q-RING girder construction, is radially equipped with one of angle and the stop screw matches
Spacing tapped through hole, be radially equipped with the fixed thread through hole to match with the fixing screws on its excess-three angle；
The midpoint of the first to fourth cantilever beam inner wall is equipped with driving foot, and the driving of first to fourth cantilever beam
The outer wall interference fit of sufficient and described moving-coil, the moving-coil is fixed in square loop girder construction；
The stop screw sequentially passes through the spacing tapped through hole, limiting slot and the circle fixed thread through hole whorl surely
Connection, for fixing the fixed circle and being engaged with the limiting slot to limit the rotational angle of the moving-coil；
Described first to the 8th piezoelectric ceramics is correspondingly arranged on the outer wall of first to fourth cantilever beam midpoint both sides respectively,
And first to the 8th piezoelectric ceramics equal through-thickness polarization, polarization direction are identical.
The material selection beryllium-bronze of the metallic elastic matrix.
First to the 8th piezoelectric ceramics can be adopted to be arranged on the outer wall of its respective cantilevered beam in the method for paste, it polarizes
Direction can be disposed as the outer method direction relative to the cantilever beam surface pasted, and the surface for connecing excitation electrode is scribbled for polarization
With the external electrode of excitation, for applying electric field along piezoelectric ceramics polarization direction, the d of piezoelectric ceramics is utilized31Effect is in elastic base
Single order and the second order flexural vibrations of cantilever beam are motivated on body.
The pedestal is in hollow cylindrical, and post jamb is equipped with and three fixed thread through holes one in square loop girder construction
One corresponding tapped through hole, is fixedly linked by three fixing screws and the square loop girder construction, for axial branch
Support the iris diaphgram.
Operation mode Fig. 3 (a) and Fig. 3 of piezoelectric actuator（b）Shown, Fig. 3 (a) illustrates, the two panels on every cantilever beam
When piezoelectric ceramics is applied with cross streams pumping signal, the first-order bending vibration of first to fourth cantilever beam is inspired, in driving foot
Place's synthesis normal direction movement；Fig. 3 (b) illustrates, when the two panels piezoelectric ceramics on every cantilever beam applies anti-phase exchange pumping signal, swashs
The second order flexural vibrations of first to fourth cantilever beam are sent, tangential motion is synthesized at driving foot.Above-mentioned two mode is in driving foot
The phase difference of the vibration at place spatially is 90 °, and under every kind of mode, the vibration displacement of the driving foot on adjacent cantilever beam is rung
There should be 180 ° of phase difference.
If it is 90 ° of pumping signal to apply phase difference to the two panels piezoelectric ceramics on every cantilever beam, specifically, to the
First, the three, the five, the 7th piezoelectric ceramics apply sinusoidal signal, and second, the four, the six, the 8th piezoelectric ceramics are applied with cosine letter
Number, the complex vibration of above two mode is motivated, positive elliptic motion, and the drive on adjacent cantilever beam are produced at driving foot
Elliptic motion at action spot has 180 ° of phase difference, i.e., the driving on adjacent cantilever beam is alternately accomplished in one cycle enough
Elliptic motion.The interference fit used between driving foot and moving-coil makes driving be pressed in enough on moving-coil excircle.Driving
Under the action of sufficient elliptical trajectory, by driving the effect of frictional force between foot and moving-coil, moving-coil is promoted to rotate forward, and then
Drive diaphragm piece to rotate forward, shrink the clear aperature of iris diaphgram.
Cosine signal is applied to first, the three, the five, the 7th piezoelectric ceramics, is made pottery to second, the four, the six, the 8th piezoelectricity
Porcelain applies sinusoidal signal, produces reverse elliptic motion at the driving foot of first to fourth cantilever beam at this time, and then pass through first
To the effect of frictional force between the driving foot and moving-coil of the 4th cantilever beam, promote moving-coil to rotate backward, and then drive diaphragm piece anti-
To rotation, expand the clear aperature of iris diaphgram.
By the phase difference of two pumping signals of control and the umber of pulse of excitation, it can be achieved that moving-coil different directions and different angles
The rotation of degree.
By adjusting the frequency or driving voltage of pumping signal, moving-coil velocity of rotation is adjusted.
By controlling direction and the rotating speed of the rotation of piezoelectric actuator ultra-precision driving moving-coil, the expansion of iris diaphgram clear aperature is realized
Big and contraction, so as to complete the control to radiation of light source flux.
Those skilled in the art of the present technique are it is understood that unless otherwise defined, all terms used herein（Including skill
Art term and scientific terminology）With the identical meaning of the general understanding with the those of ordinary skill in the utility model fields
Justice.It should also be understood that those terms such as defined in the general dictionary should be understood that with upper with the prior art
The consistent meaning of meaning hereinafter, and unless defined as here, will not with the implication of idealization or overly formal come
Explain.
Above-described embodiment, the purpose of this utility model, technical solution and beneficial effect have been carried out into
One step describes in detail, it should be understood that the foregoing is merely specific embodiment of the present utility model, is not used to limit
The utility model processed, where within the spirit and principles of the present invention, any modification, equivalent substitution, improvement and etc. done,
It should be included within the scope of protection of this utility model.
Claims (3)
1. the iris diaphgram light modulating device of a kind of Piezoelectric Driving, it is characterised in that make including iris diaphgram, stop screw, piezoelectricity
Dynamic device, pedestal and three fixing screws, the iris diaphgram, piezoelectric actuator, pedestal are coaxially disposed；
The iris diaphgram includes moving-coil, fixed circle and some diaphragm pieces；
The moving-coil and Ding Quan are hollow cylinder of the bottom surface for annular shape, and the fixed circle is co-axially located in moving-coil；
Described equal one end of diaphragm piece is equipped with and its connected fixing pin, and the other end is equipped with can be with respect to the activity that it is freely rotated
Pin；
The one-to-one mounting hole of some and described diaphragm piece fixing pin is uniformly provided with the moving-coil bottom surface, it is described to enclose bottom surely
The one-to-one sliding groove of some and described diaphragm piece activity pin is uniformly provided with face；
Described diaphragm piece one end is hinged by its corresponding mounting hole on fixing pin and the moving-coil, and the other end passes through removable pin
Nail is installed in described its upper corresponding sliding groove of fixed circle；
Surely the post jamb enclosed is equipped with encloses fixed thread through hole surely；It is circumferential on the outer wall of the moving-coil to be equipped with limiting slot；
The piezoelectric actuator includes first to fourth cantilever beam and the first to the 8th piezoelectric ceramics；
First to fourth cantilever beam uses metallic elastic matrix, joins end to end to form square loop girder construction, square
Chamfered is made at four angles of ring beam structure, and the limit to match with the stop screw is radially equipped with one of angle
Position tapped through hole, is radially equipped with the fixed thread through hole to match with the fixing screws on its excess-three angle；
The midpoint of the first to fourth cantilever beam inner wall be equipped with driving foot, and first to fourth cantilever beam driving foot and
The outer wall interference fit of the moving-coil, the moving-coil is fixed in square loop girder construction；
The stop screw sequentially passes through the spacing tapped through hole, limiting slot and the fixed thread through hole whorl that encloses surely and connects
Connect, for fixing the fixed circle and being engaged with the limiting slot to limit the rotational angle of the moving-coil；
Described first to the 8th piezoelectric ceramics is correspondingly arranged on the outer wall of first to fourth cantilever beam midpoint both sides respectively, and the
The equal through-thickness polarization of one to the 8th piezoelectric ceramics, polarization direction are identical；
The pedestal is in hollow cylindrical, and post jamb is equipped with a pair of with three fixed thread through holes one in square loop girder construction
The tapped through hole answered, is fixedly linked by three fixing screws and the square loop girder construction, and institute is supported for axial
State iris diaphgram.
2. the iris diaphgram light modulating device of Piezoelectric Driving according to claim 1, it is characterised in that the metallic elastic base
The material selection beryllium-bronze of body.
3. the iris diaphgram light modulating device of Piezoelectric Driving according to claim 1, it is characterised in that described first to the 8th
Piezoelectric ceramics is adopted to be correspondingly arranged on the outer wall of first to fourth cantilever beam midpoint both sides in the method for paste.
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| CN201721000212.5U CN207232479U (en) | 2017-08-11 | 2017-08-11 | A kind of iris diaphgram light modulating device of Piezoelectric Driving |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462963A (en) * | 2017-08-11 | 2017-12-12 | 南京航空航天大学 | The iris diaphgram light modulating device and method of a kind of Piezoelectric Driving |
| CN110646936A (en) * | 2019-09-17 | 2020-01-03 | 中国科学院光电研究院 | Adjustable diaphragm device suitable for different light beam conditions |
| CN110755757A (en) * | 2019-09-27 | 2020-02-07 | 南京航空航天大学 | Piezoelectric-driven integrated high-precision variable-field collimator |
| WO2024016239A1 (en) * | 2022-07-20 | 2024-01-25 | 北京小米移动软件有限公司 | Aperture mechanism |
-
2017
- 2017-08-11 CN CN201721000212.5U patent/CN207232479U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107462963A (en) * | 2017-08-11 | 2017-12-12 | 南京航空航天大学 | The iris diaphgram light modulating device and method of a kind of Piezoelectric Driving |
| CN110646936A (en) * | 2019-09-17 | 2020-01-03 | 中国科学院光电研究院 | Adjustable diaphragm device suitable for different light beam conditions |
| CN110755757A (en) * | 2019-09-27 | 2020-02-07 | 南京航空航天大学 | Piezoelectric-driven integrated high-precision variable-field collimator |
| WO2024016239A1 (en) * | 2022-07-20 | 2024-01-25 | 北京小米移动软件有限公司 | Aperture mechanism |
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