WO2013156055A1 - Schaltung zur erzeugung eines laserdiodenansteuerungssignals - Google Patents
Schaltung zur erzeugung eines laserdiodenansteuerungssignals Download PDFInfo
- Publication number
- WO2013156055A1 WO2013156055A1 PCT/EP2012/056970 EP2012056970W WO2013156055A1 WO 2013156055 A1 WO2013156055 A1 WO 2013156055A1 EP 2012056970 W EP2012056970 W EP 2012056970W WO 2013156055 A1 WO2013156055 A1 WO 2013156055A1
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- WO
- WIPO (PCT)
- Prior art keywords
- laser diode
- circuit
- modulator
- signal
- modulation
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
- H01S5/06226—Modulation at ultra-high frequencies
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/065—Mode locking; Mode suppression; Mode selection ; Self pulsating
- H01S5/0651—Mode control
- H01S5/0652—Coherence lowering or collapse, e.g. multimode emission by additional input or modulation
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/20—Lamp housings
- G03B21/2053—Intensity control of illuminating light
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/068—Stabilisation of laser output parameters
- H01S5/06808—Stabilisation of laser output parameters by monitoring the electrical laser parameters, e.g. voltage or current
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3129—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] scanning a light beam on the display screen
- H04N9/3135—Driving therefor
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/04—Processes or apparatus for excitation, e.g. pumping, e.g. by electron beams
- H01S5/042—Electrical excitation ; Circuits therefor
- H01S5/0427—Electrical excitation ; Circuits therefor for applying modulation to the laser
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S5/00—Semiconductor lasers
- H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
- H01S5/062—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes
- H01S5/06209—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium by varying the potential of the electrodes in single-section lasers
- H01S5/0622—Controlling the frequency of the radiation
Definitions
- the invention is based on a circuit for generating a laser diode drive signal according to the preamble of claim 1.
- laser sources in particular in a laser-based image projection system, enables the generation of images with a very large color space.
- the image quality is diminished by so-called speckies. Speckles arise when coherent light, for example laser light, strikes a surface and is scattered there, as is the case, for example, when laser light strikes a projection screen.
- the light waves of all scattering centers are superimposed on one another and, on the one hand, there are destructive interferences in which the superimposed light waves cancel each other out, resulting in dark points in the viewing point and, on the other hand, constructive interference in which superimposed light waves amplify.
- the document WO 97/02507 A1 describes an optical arrangement which comprises a rotating mirror which is surrounded by a conical reflector. Due to the rotation of the rotating mirror, the laser light is guided over the lateral surface of the conical reflector. Due to the associated rapid movement, a mixture of interference phenomena occurs, whereby they can no longer be visually perceived.
- a disadvantage of this device that mechanically moving components are used, so that the realization - especially for mobile projectors - is relatively expensive. In addition, miniaturization necessary for mobile systems is not possible.
- the invention relates to a circuit for generating a laser diode drive signal according to the preamble of claim 1.
- the gist of the invention is that the circuit (100) comprises an H F modulator for modulating the laser diode drive signal with a modulation signal, the circuit further comprising matching means for adjusting the H F modulator, the tuning means being dependent on at least one laser diode operation information configured or configurable.
- the inventive circuit, the laser diode recording invention, the image projector according to the invention, the inventive method for adjusting an H F modulator in a circuit for generating a modulated laser diode drive signal from a laser diode drive signal and the manufacturing method according to the independent claims have the advantage over the prior art that an electronic solution for speckle reduction is provided, which has an optimal (power) adaptation of the H F modulator or the modulation signal due to the dependence of the configuration of the fitting means of the laser diode operating information.
- the adaptation advantageously makes it possible to couple as much of the electrical power of the laser diode drive signal into the laser diode as possible.
- the proportion of reflected power is kept as low as possible. This makes it possible to generate from the available electrical power with high efficiency laser radiation.
- the solution according to the invention is electronic. It can be dispensed with mechanically moved parts. Furthermore, it is advantageous that the circuit can be miniaturized and thus can be integrated in a variety of ways in a projection system. The circuit is also advantageously adaptable to different laser diodes and line lengths, the
- the circuit can be combined with other speckle reducing measures and that the circuit with laser diodes from different manufacturers is operable.
- the circuit can be used for a wide variety of laser-based projection systems, in particular because according to the invention an effective reduction of the coherence lengths is provided directly on the laser diode.
- the invention is therefore particularly suitable for mobile applications.
- Possible laser-based projection systems here are both simple systems, such as laser pointers (laser pointers) or laser rangefinders, as well as imaging systems such as laser projectors.
- the power of the modulation signal is used optimally, so that in particular results in a comparatively good Specklereduzi für adassaris. Furthermore, it is advantageous that the realization of the circuit can be done comparatively inexpensively.
- the inventive slicer reduction circuit can be used in all laser-based image projection systems, e.g. in mobile projectors or head-up displays.
- the matching means of the circuit according to the invention is advantageously configured once during the production of the circuit and remains in this configuration.
- the configuring can be done according to the operating parameters of a particular type of laser diode or also suitable for a selected laser diode.
- the fitting means can remain configurable and, for example, to be continuously configurable in ongoing projection operation as a function of laser diode operating information.
- the matching means can also be configured for another laser diode, so that one can replace the laser diodes in the laser diode holder.
- the modulation of the laser diode drive signal causes oscillation of different oscillation modes of the laser diode and / or tuning of the laser wavelength within one or more oscillation modes and thus a reduction of the coherence length of the laser light by, for example, a common oscillation of comparatively many oscillation modes of the laser diode.
- a state with widened wavelength spectrum is formed.
- This broadened wavelength spectrum causes a reduction in the coherence length.
- the reduced coherence length advantageously causes a lower contrast in the speckle pattern.
- the circuit is integrated into a laser diode receptacle, wherein the laser diode receptacle may be, for example, a receptacle or a laser diode housing.
- the circuit can also be realized with separate modules.
- the H F modulator or the modulation signal the power generated by the H F modulator is advantageously coupled into the laser diode for the most effective modulation of the operation of the laser diode.
- the circuit can be used for a plurality of laser diodes or for a plurality of laser diodes each circuit is provided, such. for three laser diodes consisting of a red, a green and a blue laser diode.
- the matching means may be discrete or constructed as an integrated circuit.
- the adjusting means is preferably constructed of active components.
- the matching means preferably has tunable capacitances (eg a varactor diode).
- discrete capacitances may preferably be connected, which are further preferably designed as a microelectromechanical system (MEMS) or as a MOSFET (metal oxide semiconductor field effect transistor).
- MEMS microelectromechanical system
- MOSFET metal oxide semiconductor field effect transistor
- Changing the output impedance level of the H F modulator is preferably achievable by disconnecting / connecting parallel transistor output stages.
- inductors can preferably be switched on / off via switches, the inductors preferably being connected in series.
- the laser diode operating information comprises a laser diode operating current I and / or a laser diode operating voltage U.
- the detection of the high-frequency portion of the laser diode operating current and voltage can be done in different ways:
- the two signals are detected by means of a fast sampling element in the time domain, and by time-resolved sampling the amount and phase of the signals are determined.
- the two signals are detected by mixing with a high-frequency reference signal of the same or similar frequency. From the resulting signal, the amount and phase of the high-frequency component are determined.
- the circuit for generating a quality signal from the ratio of the laser diode operating voltage U to the laser diode operating current I is configured.
- generating the quality signal is advantageous only the evaluation of the quality signal required.
- the circuit has a directional coupler for measuring the laser diode operating information.
- the directional coupler it is advantageously possible to obtain information regarding the modulation power fed by the H F modulator and the modulation power reflected by the laser diode. By comparing the fed modulation power with the reflected modulation power also a determination of the quality signal is possible.
- the H F modulator is configured to generate the modulation signal with a modulation frequency greater than or equal to 150 MHz and less than or equal to 1.5 GHz, and preferably greater than or equal to 200 MHz and less than or equal to 1.0 GHz.
- the lower limit to the modulation frequency is the product of the number of pixels of the projected image and the repetition rate of the projection system.
- This lower limit for the modulation frequency can still be multiplied by an additional factor, which for example has the value 2 or 3 or higher.
- the matching means for adapting the H F modulator is configured by adapting the modulation frequency of the modulation signal and / or by impedance matching the output impedance of the H F modulator.
- the adaptation of the modulation frequency of the modulation signal at a constant output impedance of the H F modulator or the impedance matching of the output impedance of the H F modulator takes place at a constant modulation frequency of the modulation signal.
- the matching means is configured such that the laser diode drive signal is modulated with the modulation signal or with a further modulation signal.
- the further modulation signal arises in this case in particular by iteration and corresponds to an improved adaptation of the modulation signal (for example due to changed operating parameters of the laser diode).
- the further modulation signal may e.g. have a different modulation frequency, but it may also have the same modulation frequency as the modulation signal.
- the adjustment means may e.g. be reconfigured in the projection mode (repeatedly), so that advantageously a respectively adapted configuration during the projection mode is possible.
- Another object relates to a laser diode receptacle, in particular a receiving base or a laser diode housing with a circuit according to one of the preceding embodiments.
- Another object relates to a projector, in particular an image projector with a laser diode recording with a circuit according to one of the preceding embodiments.
- two, three or more laser diode receptacles are provided.
- Another object relates to a projector, in particular an image projector with a laser diode recording with a circuit according to one of the preceding embodiments and with a laser diode.
- a projector in particular an image projector with a laser diode recording with a circuit according to one of the preceding embodiments and with a laser diode.
- two, three or more laser diode receptacles are provided.
- Another object relates to a method for adapting an H F modulator in a circuit for generating a modulated Laserdiodenan- control signal from a laser diode drive signal.
- a laser diode operating current and / or a laser diode operating voltage are measured as the laser diode operating information.
- the laser diode operating information is measured with a directional coupler.
- the directional coupler advantageously makes it possible to obtain information regarding the modulation power fed in by the H F modulator and the modulation power reflected by the laser diode. By comparing the fed
- Modulation power with the reflected modulation power is also a determination of the quality signal possible.
- the high-frequency modulation signal is preferably superposed superimposed on the laser drive pulse.
- the overlay preferably takes place before or after the video amplifier in the case of image projectors.
- the laser diode drive signal is modulated with the modulation signal, wherein the modulation signal has a modulation frequency greater than or equal to 150 MHz and less than or equal to 1.5 GHz, and preferably greater than or equal to 200 MHz and less than or equal to 1.0 GHz.
- the lower limit for the modulation frequency results from the product of the number of pixels the projected image and the frame rate of the projection system.
- this lower limit for the modulation frequency is still to be multiplied by an additional factor of 2 or higher.
- the matching means adapts the modulation frequency of the modulation signal.
- the matching means adapts the output impedance of the H F modulator.
- the adaptation of the modulation frequency of the modulation signal at a constant output impedance of the H F modulator or the impedance matching of the output impedance of the H F modulator takes place at a constant modulation frequency of the modulation signal.
- the matching means of the circuit is configured in dependence of the further laser diode operating information for adapting the H F modulator for generating a further modulation signal.
- the further modulation signal arises in this case in particular by iteration and corresponds to an improved adaptation of the modulation signal (for example due to changed operating parameters of the laser diode).
- the further modulation signal may e.g. have a different modulation frequency, but it may also have the same modulation frequency as the modulation signal.
- the adjustment means may e.g. be reconfigured in the projection mode (repeatedly), so that advantageously a respectively adapted configuration during the projection mode is possible.
- a further subject matter relates to a method for producing a laser diode receptacle with a circuit according to one of the preceding claims.
- FIG. 1 schematically shows a circuit according to an exemplary embodiment
- FIG. 2 schematically shows a circuit according to a further exemplary embodiment
- FIG. 3 schematically shows an image projector and a laser diode receptacle according to an exemplary embodiment
- FIG. 4 schematically shows an image projector according to an example embodiment
- FIGS. 5a, 5b, 5c and 5d schematically illustrate exemplary embodiments of matching circuits.
- FIG. 1 schematically shows a circuit 100 according to an exemplary embodiment of the present invention, wherein the circuit 100 comprises the components arranged in the dashed-line region.
- the circuit 100 has a laser diode drive signal 5 at an input.
- the circuit 100 has an RF modulator 6, a matching circuit 9, a resistor 11 and an evaluation circuit 10.
- the laser diode drive signal 5 may be an unmodulated or already modulated signal, a continuous wave signal, or an interrupted signal.
- the RF modulator 6 generates a modulation signal with which the laser diode drive signal 5 is modulated.
- the laser diode drive signal 5 is thus converted into a modulated laser diode drive signal 51 by the RF modulator 6 and the subsequent matching circuit 9.
- the modulated laser diode drive signal 51 drives a laser diode 2.
- a laser diode operating voltage U and a laser diode operating current I are measured. From the laser diode operating voltage U and the laser diode operating current I, a quality signal 12 is determined in the evaluation circuit 10, which is transmitted directly to the matching circuit 9. Speckle can be reduced by high-frequency modulation of laser diode drive signals for laser diodes with frequencies in the range between 150 MHz and 1.5 GHz. In particular, oscillate through this modulation more vibration modes of the laser diode, which leads to a broadening of the light emitted from the laser diode light spectrum.
- the tuning of the laser diode disturbs the temporal coherence of the emitted laser radiation and thus leads to a reduction of its coherence length. This manifests itself in a projected image with significantly reduced speckle. Not only the speckle contrast decreases, but also the speckle itself are finer and less disturbing to the viewer.
- This high-frequency modulation of the laser diode drive signal can preferably be integrated into a projection system in various ways by means of an HF driver.
- the circuit 100 can be integrated directly at the laser diode in the laser diode housing or in the laser diode recording.
- the circuit 100 may also be arranged outside the laser diode housing. To adapt the H F modulator 6 and the modulation signal, two methods are provided (use individually or together).
- FIG. 2 schematically shows a circuit 100 according to a further exemplary embodiment, wherein the circuit 100 comprises the components arranged in the dashed area.
- This circuit 100 differs from the circuit 100 shown in FIG. 1 in that a directional coupler 20 is disposed therein.
- the directional coupler 20 determines from the laser diode drive signal 51 a voltage Ur and a voltage Uh.
- FIG. 3 schematically shows an image projector 4 and a laser diode receptacle 1 according to an exemplary embodiment.
- the laser diode holder 1 has a housing 3.
- the laser diode holder 1 receives the laser diode 2.
- the circuit 100 according to the invention according to FIG. 1 is preferably arranged in the laser diode receptacle 1.
- the video projector 7 sends a laser diode drive signal 5, which is already modulated with image information to the circuit 100.
- the circuit shown in FIG. 1 applies.
- the modulated laser diode drive signal 51 is generated from the laser diode drive signal 5.
- the circuit 100 may be integrated into the housing for the video electronics.
- the circuit 100 can also be arranged outside the housing for the video electronics.
- FIG. 4 schematically shows a projector 4, in particular an image projector 4 according to an exemplary embodiment of the present invention.
- the image projector 4 preferably has the circuit according to the invention from FIG. 2.
- the laser diode drive signal 51 is transmitted from the image projector 4 to a conventional laser diode holder 1 and to the laser diode 2, respectively.
- FIGS. 5a, 5b, 5c and 5d schematically show exemplary embodiments of matching circuits.
- FIG. 5 a shows a matching circuit 9 with a transistor 501, two adjustable capacitances 502, 504 and an adjustable inductance 503 in the form of a pi-element.
- the pi-gate represents an embodiment of a low-pass filter and transforms the current and voltage ratio in a desired manner. From the literature further embodiments (other order of the filter, T-structure, etc.) are known.
- Fig. 5b a further matching circuit 9 is shown with three parallel-connected transistors 505, the three points are intended to suggest that even more parallel-connected transistors can be arranged. This circuit sets a variable impedance level.
- FIG. 5c shows a further element of the matching circuit 9 with an inductance 506 which can be switched on and off via a switch 507.
- the imaginary part of the impedance can be changed by the amount of inductance.
- an adjustable in several stages imaginary part of the impedance can be achieved.
- FIG. 5d another element of the matching circuit 9 is shown with three capacitors 509 connected in parallel, wherein the capacitances each via switch 508 are switched on and off. The three points indicate that more capacity can be arranged. Due to the parallel connection of the capacitors, the imaginary part of the impedance can also be set in steps.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- General Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
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Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP12716351.7A EP2839555A1 (de) | 2012-04-17 | 2012-04-17 | Schaltung zur erzeugung eines laserdiodenansteuerungssignals |
US14/395,370 US9755400B2 (en) | 2012-04-17 | 2012-04-17 | Circuit for producing a laser diode control signal |
RU2014145763A RU2614654C2 (ru) | 2012-04-17 | 2012-04-17 | Схема для генерации сигнала управления лазерным диодом |
KR1020147028743A KR101906651B1 (ko) | 2012-04-17 | 2012-04-17 | 레이저 다이오드 제어 신호의 생성을 위한 회로 |
PCT/EP2012/056970 WO2013156055A1 (de) | 2012-04-17 | 2012-04-17 | Schaltung zur erzeugung eines laserdiodenansteuerungssignals |
CN201280072433.7A CN104247175A (zh) | 2012-04-17 | 2012-04-17 | 用于产生激光二极管控制信号的电路 |
JP2015506101A JP2015514332A (ja) | 2012-04-17 | 2012-04-17 | レーザーダイオード駆動制御信号を生成する回路 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/EP2012/056970 WO2013156055A1 (de) | 2012-04-17 | 2012-04-17 | Schaltung zur erzeugung eines laserdiodenansteuerungssignals |
Publications (1)
Publication Number | Publication Date |
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WO2013156055A1 true WO2013156055A1 (de) | 2013-10-24 |
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ID=46001200
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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PCT/EP2012/056970 WO2013156055A1 (de) | 2012-04-17 | 2012-04-17 | Schaltung zur erzeugung eines laserdiodenansteuerungssignals |
Country Status (7)
Country | Link |
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US (1) | US9755400B2 (de) |
EP (1) | EP2839555A1 (de) |
JP (1) | JP2015514332A (de) |
KR (1) | KR101906651B1 (de) |
CN (1) | CN104247175A (de) |
RU (1) | RU2614654C2 (de) |
WO (1) | WO2013156055A1 (de) |
Cited By (1)
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JP2016181539A (ja) * | 2015-03-23 | 2016-10-13 | 日本電信電話株式会社 | 光回路 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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EP3382344B1 (de) * | 2017-03-30 | 2021-12-15 | Melexis Technologies SA | Fehlererkennung |
KR102006834B1 (ko) | 2017-09-27 | 2019-08-02 | 최환용 | 멀티채널 레이저 다이오드 광원 제어장치 및 그 제어방법 |
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JP2011096742A (ja) * | 2009-10-28 | 2011-05-12 | Citizen Finetech Miyota Co Ltd | レーザー光源 |
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2012
- 2012-04-17 WO PCT/EP2012/056970 patent/WO2013156055A1/de active Application Filing
- 2012-04-17 KR KR1020147028743A patent/KR101906651B1/ko active IP Right Grant
- 2012-04-17 RU RU2014145763A patent/RU2614654C2/ru active
- 2012-04-17 EP EP12716351.7A patent/EP2839555A1/de not_active Withdrawn
- 2012-04-17 CN CN201280072433.7A patent/CN104247175A/zh active Pending
- 2012-04-17 JP JP2015506101A patent/JP2015514332A/ja active Pending
- 2012-04-17 US US14/395,370 patent/US9755400B2/en active Active
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EP0667659A2 (de) * | 1994-02-09 | 1995-08-16 | Hughes Aircraft Company | Optoelektronisch kontrolliertes RF Anpassungsnetzwerk |
WO1997002507A1 (en) | 1995-07-03 | 1997-01-23 | The Regents Of The University Of California | Speckle averaging system for laser raster-scan image projection |
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JP2016181539A (ja) * | 2015-03-23 | 2016-10-13 | 日本電信電話株式会社 | 光回路 |
Also Published As
Publication number | Publication date |
---|---|
JP2015514332A (ja) | 2015-05-18 |
RU2014145763A (ru) | 2016-06-10 |
US20150116673A1 (en) | 2015-04-30 |
US9755400B2 (en) | 2017-09-05 |
RU2614654C2 (ru) | 2017-03-28 |
EP2839555A1 (de) | 2015-02-25 |
KR101906651B1 (ko) | 2018-12-07 |
KR20150002667A (ko) | 2015-01-07 |
CN104247175A (zh) | 2014-12-24 |
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