CN100359402C - High repetition frequency high precision rotating disk type mechanical shutter device - Google Patents
High repetition frequency high precision rotating disk type mechanical shutter device Download PDFInfo
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- CN100359402C CN100359402C CNB031495427A CN03149542A CN100359402C CN 100359402 C CN100359402 C CN 100359402C CN B031495427 A CNB031495427 A CN B031495427A CN 03149542 A CN03149542 A CN 03149542A CN 100359402 C CN100359402 C CN 100359402C
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Abstract
The present invention discloses a rotary disc mechanical shutter device of high repeating frequency and high accuracy for switch controlling of light signals. A thin and light rotary disc with a plurality of opening holes is fixed on a shaft head of a motor by a set nut and a shaft sleeve, a photoelectric switch fixed on a base seat measures the rotation information of the rotary disc, and a moveable photodiode probe is arranged at the back side of the rotary disc where signal beams penetrate through. The structure of the mechanical shutter device disclosed by the present invention is simple and easy to realize. The rotary disk type mechanical shutter device can simultaneously reach to the repeating frequency of a kHz switch and the setting accuracy of microsecond level switching time. The mechanical shutter device of the present invention can be used in the application fields of laser satellites, etc. in laser radar, laser ranging, laser space communication and self-adaptive optics.
Description
Technical field
The present invention relates to high repetition frequency high precision rotary disk mechanical shutter device, be used for light signal is carried out the high-precision switch control of high repetition frequency.
Background technology
In the applications such as the artificial guiding of laser in laser radar, laser ranging, space laser communication, adaptive optical technique, need survey the target of a distance.Its working system all is to launch a laser pulse earlier, postpones to receive the light signal that returns from target with photodetector behind the certain hour, obtains effective information from heliogram.In some application scenario, paired pulses Laser emission and photoelectricity receiving course repetition frequency require very high.For example repetition frequency can reach KHz on the hundreds of in the laser guide star in adaptive optical technique.The time delay size is directly proportional with target range.Usually several kilometers to several thousand kilometers of target range detectors to be measured.The measuring accuracy of target range directly depends on the setting accuracy of time delay.Because the light velocity is very fast, only need about 1 microsecond time back and forth from 150 meters distances, so will reach the range sensing precision of hundred meter levels, the time set accuracy requirement reaches the microsecond level.
Because the heliogram of distant location is general fainter, needs to improve as far as possible the power or the pulse energy of emission laser, and adopt the photoelectric detector of high sensitivity such as image intensifier, photomultiplier.The highly sensitive photoelectric detector price general charged of this class costliness has strict demand to environment for use, careless slightly just damage easily.Various parasitic lights during the high power pulsed laser emission and closely interior atmospheric backscatter light will cause damage to this class high sensitivity photoelectric detector, or make the serious saturated cisco unity malfunction of its signal, or shorten its serviceable life rapidly.Before utilizing mechanical shutter devices to be placed on the photosurface of high sensitivity photoelectric detector, can effectively protect it, and the state of turning on and off of photodetector is controlled.Though the high sensitivity photoelectric detector self equipped with electronic shutter of some kind; can provide protection to the circuit and the parts of inside; but it is exposed to outer photosurface and damages easily under the irradiation of strong parasitic light, still needs to adopt mechanical shutter that it is effectively protected.
The primary structure of rotary disk mechanical shutter is a light tight disk that perforate or fluting are arranged.Light beam incides on the disk, runs into the hole or groove just passes through, otherwise just is turned off.Disk just rotated to realize turning on and off of certain repetition frequency.The advantage of rotating disc type mechanical shutter is to reach completely and turns on and off, and does not influence the picture element of transmitted beam, can adapt to all optical maser wavelength.The shortcoming of rotating disc type mechanical shutter is to realize simultaneously technically that high repetition frequency and high time are provided with very difficulty of precision.Retrieve domestic and international technical paper and patent documentation and find that Wang Jingjiang has announced a kind of mechanical shutter devices in " design of high precision rotating shutter " literary composition of " optical engineering " the 4th phase 12-17 page or leaf of publication in 1981.In order to improve the rotating speed of shutter, shorten the time shutter, this device is gone up with high-speed electric expreess locomotive and is driven a gear set, and gear set makes four blade collaborative works, the switch of control incident beam.According to this article introduction, this overlaps the highest time shutter that can realize 1/120 second of shutter device, and precision ± 20 microseconds is set lock in time.This is at present domestic disclosed fastest, rotary disk mechanical shutter device that precision is the highest.But the structure more complicated of this mechanical shutter devices is utilized this technological means, can't reach the repetition frequency of KHz and the time of microsecond level simultaneously precision is set.
Summary of the invention
Technology of the present invention is dealt with problems: overcome the deficiencies in the prior art, provide high time of a kind of high repetition frequency that can reach KHz and microsecond level that the high repetition frequency high precision rotary disk mechanical shutter device of precision is set.
Technical solution of the present invention is: high repetition frequency high precision rotary disk mechanical shutter device, its characteristics are: frivolous with one, the tight rotary disc that some rotational symmetry perforates are arranged directly is fixed on the spindle nose of high-speed electric expreess locomotive by the locknut and the axle sleeve of left-hand thread, high-speed electric expreess locomotive and optoelectronic switch are fixed on the base, pass the back location of rotating disk at signal beams a high-speed photodiode is installed, high-speed photodiode is installed on the cantilever that can freely put into light path or take away, rotating disk is placed perpendicular to light path, and the rotating disk perforate is placed on the position of beam diameter minimum (normally optical system focal position), by the perforate number of selecting rotating disk and the high repetition frequency that rotating speed of motor realizes KHz; Utilize photodiode to cooperate the open the door information of the actual demarcation of optoelectronic switch shutter again to incident optical signal, and the machining error between each perforate of control shutter rotating disk, when the switch repetition frequency of shutter reaches KHz, its switching time precision is set and reaches the microsecond level.
Principle of the present invention is: in order to improve the switch repetition frequency of shutter, guaranteeing to adopt frivolous axially symmetric structure when rotating disk has enough rigidity, reduce the moment of inertia of rotatable parts, rotating disk is directly installed on by axle sleeve on the spindle nose of high-speed electric expreess locomotive, and transmission link is to the influence of shutter speed and precision in the middle of removing.At this moment the switch repetition frequency of shutter equals that the perforate number multiply by motor speed on the rotating disk, on rotating disk, open a plurality of holes and adopt high-speed electric expreess locomotive, the shutter release repetition frequency is easy to reach KHz, utilize the turn signal of optoelectronic switch actual measurement rotating disk simultaneously, as the reference signal of aperture time control, site error is provided with the influence of precision between further deflate rotating speed of motor shake and perforate to aperture time; And on the use device movably high-speed photodiode cooperate optoelectronic switch, the actual information of opening the door of demarcating shutter to incoming signal, when the switch repetition frequency that influences shutter that the site error in the deflate shutter actual installation process is provided with precision to aperture time reaches KHz, its switching time precision is set and reaches the microsecond level.
The advantage that the present invention compared with prior art has is: (1) directly is fixed on the shutter rotating disk on the spindle nose of high-speed electric expreess locomotive, without any middle transmission link; (2) by suitably increasing the perforate number on the rotating disk, can be in the requirement that guarantees to reduce when shutter has high switch repetition frequency to motor speed; (3) utilize the turn signal of the optoelectronic switch actual measurement rotating disk on the shutter device, site error is provided with the influence of precision between shake of deflate rotating speed of motor and perforate to aperture time; (4) on the use device movably high-speed photodiode cooperate optoelectronic switch, the actual information of opening the door of demarcating shutter to incoming signal, the site error in the deflate shutter actual installation process is provided with the influence of precision to aperture time; (5) the rotating disk perforate vertically is placed on the position of beam diameter minimum of light path, at utmost reduces the transit time that width of light beam causes; (6) installation way of axle sleeve and locknut is convenient to change different rotating disks, to adapt to various workplaces needs.This mechanical shutter devices can be used for the applications such as the artificial guiding of laser of laser radar, laser ranging, space laser communication, adaptive optics.
Description of drawings
Fig. 1 is a structural representation of the present invention, and wherein 1 is rotating disk, and 2 is locknut, the 3rd, and axle sleeve, the 4th, motor, the 5th, base, the 6th, optoelectronic switch, the 7th, cantilever, the 8th, photodiode;
Fig. 2 is Fig. 1 turntable structural representation, wherein D is the incident beam diameter, r is the effective radius of rotating disk, R is the real radius of rotating disk, ω is the rotational speed of rotating disk, 1 divides the subtended angle of relative disk axes for the rotating disk aperture portion, and 2 is the rotating disk blocking part subtended angle of disk axes relatively, and θ is the optoelectronic switch installation site and the subtended angle of the relative disk axes of signal beams distance between centers;
Fig. 3 is an enabling signal synoptic diagram of the present invention, wherein between A-B for T1 transit time that opens the door, open time T 2 fully for shutter between B-C, be T1 transit time that closes the door between C-D, be the complete turn-off time T3 of shutter between D-E, be a complete shutter period T between A-E;
Fig. 4 is for being provided with the graph of a relation of each perforate room machine mismachining tolerance on precision and motor speed, rotating disk effective radius, the rotating disk switching time of the present invention.
Embodiment
As shown in Figure 1, locknut 2 and the axle sleeve 3 of a light tight thin disk 1 that has some rotational symmetry perforates by left-hand thread directly is fixed on the spindle nose of high-speed electric expreess locomotive 4, high-speed electric expreess locomotive 4 and optoelectronic switch 6 are fixed on the base 5, pass the back location of rotating disk 1 at signal beams a high response speed photodiode 8 is installed, photodiode 8 is installed on the cantilever 7 that can freely put into light path or take away.Perforate on the rotating disk 1 is the light hole of incoming signal, is again the pilot hole of optoelectronic switch 6, when the obstructed light of rotating disk 1 partly by optoelectronic switch, optoelectronic switch 6 provides a low level signal; Perforate on rotating disk 1 is by optoelectronic switch 6, optoelectronic switch 6 provides a high level signal, after rotating disk 1 rotates continuously, optoelectronic switch 6 will produce the periodic signal of on-off-on-off, and the frequency of this periodic signal is identical with the switch door repetition frequency of mechanical shutter.
As shown in Figure 2, symmetry has plurality of opening on the rotating disk 1.Optoelectronic switch 6 is placed on edge below the Z-axis of shutter disc in Fig. 2, and rotating disk 1 perforate turns over optoelectronic switch 6 earlier, just passes through the signal beams position then.θ is optoelectronic switch 6 installation sites and the subtended angle of the relative disk axes of signal beams distance between centers.In fact optoelectronic switch 6 optional position that is placed on rotating disk 1 periphery does not influence the performance of mechanical shutter.
As shown in Figure 2, the light material that the rigidity that rotating disk 1 adopts is bigger is made, and is generally the metal foil chip.Owing to have axisymmetric profile, thinner thickness, thereby moment of inertia is little, can be directly installed on the spindle nose of high-speed electric expreess locomotive, at this moment the repetition frequency of shutter release equals that the perforate number multiply by motor speed on the rotating disk, and for example the small-sized DC servomotor of (=500 revolutions per seconds) is easy to buy on market rotating speed up to 30000 rev/mins.If symmetry is opened 2 light holes on rotating disk, the high repetition frequency of shutter release is 1000 hertz; If open 4 light holes, high repetition frequency can reach 2000 hertz.Because the too high easy generation mechanical resonant of motor speed, and the blade edge also can produce resonance phenomena and very big sound because of the windage effect of air, so under the condition that precision is set in the shutter release repetition frequency of satisfying the demand and time, reduce the stability that motor speed guarantees whole mechanical shutter devices as far as possible.
The perforate number of rotating disk 1 is selected N=4, roundlet among Fig. 2 in the perforate of the lower left corner is represented the cross section of incident beam on the shutter disc, D is the incident beam diameter, r is the distance in incident beam center and shutter axle center, is the effective radius of rotating disk 1, the real radius R of rotating disk 1 〉=r+D/2, assurance is to effective blocking of incident beam, ω is the rotational speed of rotating disk, and 1 divides the subtended angle of relative disk axes for the rotating disk aperture portion, and 2 is the rotating disk blocking part subtended angle of disk axes relatively.
If on a mechanical shutter devices, need to switch several mode of operations, just design several rotating disks that can exchange, and debug again or after rotating disk changes, only need to repeat a calibration process and get final product when shutter device.
The incident beam cross section has a certain size, and the rotating speed of rotating disk 1 is also limited, and incident beam will exist one to open gradually and a transient process of turn-offing gradually in rotating disk 1 perforate.Figure 3 shows that enabling signal synoptic diagram of the present invention, wherein between A-B for opening the door transit time, open the time fully for shutter between B-C, for closing the door transit time, be the complete turn-off time of shutter between D-E between C-D, be a complete shutter cycle between A-E.
The shutter repetition frequency is: f=N * ω
The size of shutter period T is: T=1/f=( 1+ 2)/(2 π ω)
Transit time, the size of T1 was: T1=D/ (2 π ω r)
The size of the time T of opening the door fully 2 is: T2= 1/ (2 π ω)-T1
The size of lockup T3 is fully: T3= 2/ (2 π ω)-T1
The incident beam bore is influential to the shutter performance on the shutter turntable surface.In the pulse laser emitting-receiving system, must when turn-offing fully, launch at shutter laser, and open the back fully at shutter and receive light echo.The size restriction of T1 transit time of opening the door and close the door is transmitted into the minimum interval of reception of impulse from pulse.For example in laser radar system, limit the minor increment that to survey transit time.Suppose motor speed ω=18000 rev/min of this mechanical shutter devices=300 revolutions per seconds, number of aperture N=4 on the rotating disk, shutter frequency f=N * ω=1200 hertz, shutter period T=1/f=833 microsecond, light beam axle center and shutter centre distance r=60 millimeter, 60 millimeters of shutter rotating disk radiuses.If the incident beam diameter D=1 millimeter on the shutter turntable surface, T1=D/ transit time that then opens the door and close the door (2 π ω r)=1/ (2 π * 300 * 60)=8.84 microseconds, the minimum operating distance of limit laser radar is 1.33 kilometers.If beam diameter is greatly to 10 millimeters, then minimum operating distance is 13.3 kilometers, and is very big to the usable range influence of laser radar.To pass the incident beam bore of rotating disk perforate in order reducing to greatest extent,, and the perforate of rotating disk to be placed on the position of the beam diameter minimum of incident beam plane of rotor disc and incident beam axis normal.
Time about shutter device is provided with precision problem, and the time of rotary disk mechanical shutter is provided with speed error, positioning reference signal errors, the time delay that precision depends primarily on rotating disk three aspects of trueness error is set.
In mechanical shutter devices of the present invention, adjust the driving voltage of motor according to the actual loading situation of motor, can adjust rotating speed of motor.After control voltage and load constant magnitude, the actual speed of motor is kept by the inertia of whole rotational structure.If after each rotatable parts of shutter had been carried out careful transient equilibrium and adjust, rotating speed of motor can be stabilized in quite high level, the influence that aperture time is provided with precision can be ignored.
In the mechanical shutter devices of the present invention, the positioning reference signal comes from optoelectronic switch.Perforate on the rotating disk is the light hole of incoming signal, is again the pilot hole of optoelectronic switch.This version has avoided the site error between positioning reference signal and actual logical light signal aperture time to be provided with the influence of precision.When a plurality of perforate, the forward position of each pulse signal that utilizes the optoelectronic switch actual measurement is as the positioning reference of aperture time control, promptly each all with the location, forward position of current perforate, further site error is provided with the influence of precision between deflate rotating speed of motor jitter error and different perforates to aperture time;
In the present invention, mechanical shutter devices to actual incident beam open the door constantly relatively with the time delay of positioning reference signal by on installing movably high-speed photodiode cooperate the actual demarcation of optoelectronic switch: by cantilever high-speed photodiode is put into light path before work, the continuous light source identical with pulse incident beam to be measured with a bore shines on the photodiode target surface by rotating disk; Shutter is started and stable rotation; Along with the switch of incoming signal light, photodiode is exported the periodic signal of corresponding high level-low level-high level.This periodic signal has truly reflected the switch door information of mechanical shutter.The periodic signal and the periodic signal on the optoelectronic switch of photodiode are compared, just can accurately measure the actual time of opening the door of mechanical shutter with respect to the time delay between optoelectronic switch positioning reference signal.After shutter device is debug again or changed rotating disk, all carry out one time calibration process so again each time, eliminate the time delay step-up error is provided with precision to aperture time influence.
Finally, the time of mechanical shutter devices of the present invention is provided with precision and depends on the machining error between each perforate on the shutter rotating disk.Under general conventional processing technology level, 0.1 millimeter machining accuracy is easy to accomplish.If adopt advanced technologies such as precise numerical control machine, can reach the machining accuracy more than 0.01 millimeter.If the maximum position error on the shutter rotating disk between each perforate is Δ L, then the minimum time of shutter is provided with precision Δ T=Δ L/ (2 π ω r).Fig. 4 is for being provided with switching time of rotary disk mechanical shutter of the present invention relation between the machining error Δ L between each perforate on precision and motor speed ω, rotating disk effective radius r, the rotating disk.If number of aperture N=4, motor speed ω=300 revolutions per second, shutter frequency f=N * ω=1200 hertz, shutter rotating disk effective radius r=60 millimeter, machining error Δ L=0.1 millimeter, then the minimum time of shutter is provided with precision Δ T=0.1/ (2 π * 300 * 60)=0.88 microsecond.If further improve rotating speed of motor, perhaps add the diameter of traffic cycle, the time of shutter is provided with precision and can also further improves.
Below in conjunction with the design that an instantiation is set forth each parameter on the mechanical shutter devices of the present invention, for example need to design a repetition frequency 1600Hz, switch is provided with the rotary disk mechanical shutter device of precision＜1 microsecond, times 20 microsecond of opening the door.Shutter is placed near the focal position of imaging system, 100 millimeters of imaging system focal lengths, visual field 1 degree.0.1 millimeter of existing machinery level of processing.The physical dimension restriction rotating disk radius of installed position≤60 millimeters.
(1) precision is at first as required determined motor speed and rotating disk effective radius.According to Fig. 4, select 400 revolutions per seconds of motor speeds, 50 millimeters of rotating disk effective radiuses guarantee that switch is provided with precision＜1 microsecond;
(2) shutter repetition frequency is as required determined rotating disk perforate number N=1600/400=4;
(3) calculate size transit time that shutter position with pores beam diameter causes.Largest beam diameter D=focal length * visual field=1.74 millimeters, switch door T1=D/ transit time (2 π ω r)=1.74/ (2 π * 300 * 60)=15.4 microseconds;
(4) select rotating disk real radius R=52 millimeter according to the requirement of R 〉=r+D/2;
(5) determine rotating disk perforate size according to the time size of opening the door.As requested, the time T of opening the door fully 2=20 microsecond is so the rotating disk aperture portion is divided subtended angle 1=2 π (T2+T1) ω of relative disk axes=3.82 °.Keep certain dynamic range, do not have 1=4 ° of evaluation , corresponding rotating disk blocking part 2=86 ° of the subtended angle of disk axes relatively that get;
(6) the subtended angle θ of the subtended angle of relative disk axes is by the actual installation determining positions of optoelectronic switch in the heart in optoelectronic switch installation site and the signal beams, and the time delay that this angle causes will cooperate the optoelectronic switch actual measurement by removable photodiode.
From above analysis, can reach a conclusion, utilize rotary disk mechanical shutter device provided by the invention, under the prior art condition, utilize and easily purchase device on the various markets, can realize the switch repetition frequency of KHz, the shutter synchronization time is provided with precision and can reaches the microsecond level.
Claims (6)
1, high repetition frequency high precision rotary disk mechanical shutter device, it is characterized in that: frivolous one, the tight rotary disc (1) that some rotational symmetry perforates are arranged directly is fixed on the spindle nose of high-speed electric expreess locomotive (4) by the locknut (2) and the axle sleeve (3) of left-hand thread, the optoelectronic switch (6) of high-speed electric expreess locomotive (4) and measurement dial rotation information is fixed on the motor base (5), rotating disk (1) is placed perpendicular to light path simultaneously, and the perforate of rotating disk (1) placed on the position of beam diameter minimum, pass the back location of rotating disk (1) at signal beams a high-speed photodiode (8) is installed, high-speed photodiode (8) is installed on the cantilever (7) that can freely put into light path or take away, realizes high repetition frequency by the perforate number of selection rotating disk (1) and the rotating speed of motor (4); Utilize photodiode (8) to cooperate the actual information of opening the door of demarcating shutter of optoelectronic switch (6), and the machining error between each perforate of control shutter rotating disk (1), precision is set the switching time that reaches the microsecond level incident optical signal.
2, high repetition frequency high precision rotary disk mechanical shutter device according to claim 1 is characterized in that: the last perforate number of described rotating disk (1) multiply by motor (4) rotating speed and equals repetition frequency.
3, high repetition frequency high precision rotary disk mechanical shutter device according to claim 1 is characterized in that: described rotating disk (1) only needs dismounting locknut (2) can change the rotating disk of different structure size.
4, high repetition frequency high precision rotary disk mechanical shutter device according to claim 1, it is characterized in that: the perforate on the rotating disk (1) is the light hole of incoming signal, is again the pilot hole of optoelectronic switch (6).
5, high repetition frequency high precision rotary disk mechanical shutter device according to claim 1, it is characterized in that: high-speed photodiode (8) is put into light path before work, the actual lockup deferred message that opens the door of demarcating shutter to incoming signal; Go out light path in the life's work time shift, do not influence the transmission of light signal.
6, high repetition frequency high precision rotary disk mechanical shutter device according to claim 1 is characterized in that: when shutter device is debug again or after rotating disk changes, only needed to repeat a calibration process and get final product.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031495427A CN100359402C (en) | 2003-07-16 | 2003-07-16 | High repetition frequency high precision rotating disk type mechanical shutter device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031495427A CN100359402C (en) | 2003-07-16 | 2003-07-16 | High repetition frequency high precision rotating disk type mechanical shutter device |
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| CN1570569A CN1570569A (en) | 2005-01-26 |
| CN100359402C true CN100359402C (en) | 2008-01-02 |
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| CNB031495427A Expired - Fee Related CN100359402C (en) | 2003-07-16 | 2003-07-16 | High repetition frequency high precision rotating disk type mechanical shutter device |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100510929C (en) * | 2006-12-13 | 2009-07-08 | 中国科学院光电技术研究所 | Method for controlling frequency conversion in large dynamic range without blind area of rotary disk mechanical shutter |
| CN102749786B (en) * | 2012-07-10 | 2015-04-01 | 中国科学院光电技术研究所 | Synchronous time sequence control method for turntable type mechanical shutter |
| CN107767721B (en) * | 2017-10-26 | 2019-11-12 | 中国科学院长春光学精密机械与物理研究所 | A kind of artillery fire analogue system |
| CN110010261A (en) * | 2019-04-15 | 2019-07-12 | 中国原子能科学研究院 | A kind of speed radiation shielding shutter |
| CN110680354A (en) * | 2019-09-30 | 2020-01-14 | 中国人民解放军第四军医大学 | X-ray shutter control system and method, control device and application |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3371214A (en) * | 1963-01-30 | 1968-02-27 | Richards & Co Ltd George | Reading head with light source, rotating shutter and switched photocells |
| JPS61114231A (en) * | 1984-11-09 | 1986-05-31 | Nec Corp | Fast mechanical shutter |
| US4743108A (en) * | 1986-12-29 | 1988-05-10 | Eastman Kodak Company | Dynamic shutter mechanism |
| US5032005A (en) * | 1990-04-24 | 1991-07-16 | Nm Laser Products, Inc. | High speed shutter mechanism for a light beam |
| WO2003048835A2 (en) * | 2001-12-03 | 2003-06-12 | Lockheed Martin Corporation | High speed mechanical laser shutter |
-
2003
- 2003-07-16 CN CNB031495427A patent/CN100359402C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3371214A (en) * | 1963-01-30 | 1968-02-27 | Richards & Co Ltd George | Reading head with light source, rotating shutter and switched photocells |
| JPS61114231A (en) * | 1984-11-09 | 1986-05-31 | Nec Corp | Fast mechanical shutter |
| US4743108A (en) * | 1986-12-29 | 1988-05-10 | Eastman Kodak Company | Dynamic shutter mechanism |
| US5032005A (en) * | 1990-04-24 | 1991-07-16 | Nm Laser Products, Inc. | High speed shutter mechanism for a light beam |
| WO2003048835A2 (en) * | 2001-12-03 | 2003-06-12 | Lockheed Martin Corporation | High speed mechanical laser shutter |
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