EP2604098A1 - Method for operating a high-pressure discharge lamp outside the nominal power range thereof - Google Patents
Method for operating a high-pressure discharge lamp outside the nominal power range thereofInfo
- Publication number
- EP2604098A1 EP2604098A1 EP11743499.3A EP11743499A EP2604098A1 EP 2604098 A1 EP2604098 A1 EP 2604098A1 EP 11743499 A EP11743499 A EP 11743499A EP 2604098 A1 EP2604098 A1 EP 2604098A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- lamp
- power
- nominal power
- nominal
- pnominai
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 35
- 206010073261 Ovarian theca cell tumour Diseases 0.000 claims 1
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- 230000035772 mutation Effects 0.000 claims 1
- 238000013459 approach Methods 0.000 description 7
- 239000003086 colorant Substances 0.000 description 6
- 238000001816 cooling Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 238000011017 operating method Methods 0.000 description 4
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 4
- 229910052721 tungsten Inorganic materials 0.000 description 4
- 239000010937 tungsten Substances 0.000 description 4
- 238000004031 devitrification Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000002844 melting Methods 0.000 description 3
- 230000008018 melting Effects 0.000 description 3
- 238000005457 optimization Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009191 jumping Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000004973 liquid crystal related substance Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
- NQLVQOSNDJXLKG-UHFFFAOYSA-N prosulfocarb Chemical compound CCCN(CCC)C(=O)SCC1=CC=CC=C1 NQLVQOSNDJXLKG-UHFFFAOYSA-N 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B41/00—Circuit arrangements or apparatus for igniting or operating discharge lamps
- H05B41/14—Circuit arrangements
- H05B41/26—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc
- H05B41/28—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters
- H05B41/288—Circuit arrangements in which the lamp is fed by power derived from dc by means of a converter, e.g. by high-voltage dc using static converters with semiconductor devices and specially adapted for lamps without preheating electrodes, e.g. for high-intensity discharge lamps, high-pressure mercury or sodium lamps or low-pressure sodium lamps
- H05B41/292—Arrangements for protecting lamps or circuits against abnormal operating conditions
- H05B41/2928—Arrangements for protecting lamps or circuits against abnormal operating conditions for protecting the lamp against abnormal operating conditions
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
- H05B47/17—Operational modes, e.g. switching from manual to automatic mode or prohibiting specific operations
Definitions
- the invention relates to a method for operating high-pressure discharge lamps, in particular high and
- High-pressure discharge lamps as used in projection equipment, outside their nominal power range.
- the invention is particularly concerned with the problem of flicker phenomena caused by the operation of these discharge lamps outside their nominal power range.
- the invention is based on a method for operating a high-pressure discharge lamp outside its nominal power range according to the preamble of the main claim.
- Projection devices such as video projectors often use so-called ultrashort arc lamps due to the requirements for optical imaging.
- These are high-intensity discharge lamps, which have a very short electrode distance to a good optical image of the video projector guarantees ⁇ afford. Due to the high performance of these lamps and the short electrode distance the electric ⁇ be very hot. Therefore, with these types of lamps no simple pin electrodes are used. Instead, electrodes with a very wide electrode head are used to increase their thermal mass.
- the head diameter is greater than the electrode spacing (eg head diameter of 1.5 mm for a lamp with an electrode spacing of 1.0 mm).
- the inner end of the lamp electrode which is in the discharge space of the gas-discharge lamp burner, is referred to as the electrode end.
- the electrode tip is a needle or cam-shaped elevation seated on the end of the electrode, the end of which serves as a starting point for the arc.
- this punctiform arch approach is unstable and likes to travel over the electrode tip, which can be perceived as flicker in the application.
- a wandering arc approach leads to undesired changes in the front region of the electrode head.
- Video pros often require a light source that has a temporal sequence of different colors.
- a light source that has a temporal sequence of different colors.
- 917, 558 (Stanton) describes this may be achieved for example by a rotating color wheel, the changing of the light color of the lamp fil ⁇ tert.
- the periods during which the light assumes a certain color need not necessarily be the same. Rather, a desired color temperature, which results for the projected light, can be set via the ratio of these time periods to one another.
- the lamp is operated with a rectangular lamp current.
- the lamp frequency is the reciprocal of the period of the rectangular lamp current, as shown in Fig. 1, understood.
- the reciprocal of the period of the rectangular lamp current is understood in the operation of the lamp with nominal power.
- the nominal power is the power specified by the manufacturer of the lantern with which the lamp should be operated.
- the high-pressure discharge lamp is usually operated at a predetermined frequency.
- the lamp current is in the prior art from a DC power source with
- the commutation usually consists of electronic switches, which commute the polarity of the DC power source in time with the rectangular lamp current.
- overshoots can not be completely avoided in practice. Therefore, the time at which a commutation is to take place with the time at which the color of the light changes together ⁇ quantitative sets to hide the overshoot is in the prior art.
- a sync signal is provided which has a sync pulse in sync with the above color wheel. With the help of the sync signal, the color change and the commutation of the lamp current are synchronized.
- the lamp current does not always have a rectangular shape, but the current level can run in several stages. This current progression over time will be described below also referred to as "wave form.” An explanation of the term can be found below.
- Electrodes tips In the operation of discharge lamps, there is the phenomenon of the growth of electrode tips, which, as explained above, represent an essential prerequisite for a stable arc approach. Material that evaporates from the electrodes at a location, is deposited again at preferred locations on the Elect ⁇ rode and can thereby contribute to the formation of electrode tips. Furthermore, lie by the repeated melting and freezing of the tungsten at the electrode tip of tungsten material ⁇ later the areas of the electrode into the tip of the electrode is being transported. These transport phenomena depend strongly on the temperature of the electrode, as well as the temporal changes of this temperature and thus the operating mode of the lamp.
- the growth of the electrode tips can be caused, referred to below as the commutation pulses, for example, by so-called "Maintenancepulse". These are short current pulses, usually just before the commutation tion, which have an increased amount of current.
- Fig. 1 shows an example of such a commutation pulse in a very simple waveform.
- the waveform is divided into a plateau and the commutation pulse.
- the plateau is described by a plateau length and a plateau height, ie by a certain residence time of a current amount.
- the commutation pulse is also described by a pulse length and a pulse height, ie by the duration of the Pul ⁇ ses at a certain amount of current.
- the commutation pulse ensures a stronger melting of the electrode in the front region, which is then contracted by the surface tension of the tungsten and then cooled again after the commutation and the on ⁇ closing commutation. If this procedure is repeated with appropriate time intervals, a tip slowly forms.
- the commutation It should always be before commutation for effective application.
- FIG. 2a shows a further example of a waveform which, in addition to the commutation pulse, has a further current increase.
- the period of successive full waves is always the same size.
- Fig. 2b shows a third example of a waveform of an advanced operating method in which the period changes from full-wave to full-wave and also changes the current form from half-wave to half-wave.
- the current waveform is more complex in such cases and shows current peaks and staircase waveforms that are synchronized with the sequence of individual color segments of the color wheel. With such complex currents, it is more difficult to operate the lamp optimally, and there are a few basic design rules to follow when generating a waveform.
- the temperature of the electrode should always be within a certain range so that the electrode tip is just liquid.
- the electrode tip has the optimal temperature for a stable bow approach. This is fundamentally unproblematic when operating the lamp at nominal power and can be carried out with the known operating methods.
- the lamp is to be strongly dimmed, ie operated at a power significantly lower than the nominal power, then there is the problem that due to the reduced lamp power, the temperature of the electrodes decreases, and it comes to flicker of the discharge arc due to the low temperature of the electrodes. If the lamp is to be operated with higher power, so there is the problem that the electrodes can be too hot and an increased
- Electrode burn-back occurs. Furthermore, the opposite ⁇ from normal operation to elevated temperatures can have a Entgla- solution of the burner vessel the result. Issue
- the object is achieved according to the invention with a method for operating a high pressure discharge lamp outside its nominal power range, wherein at a lamp power less than 85% of the nominal power or at a lamp power greater than 110% of the nominal power one or more of the parameters
- the operating method of the invention allows high ⁇ pressure discharge lamps, particularly for edictionsan architectureen Pro to operate in an expanded power range.
- the typically achievable from the prior art power range for Pro edictionslampen is between 70% -85% and 110% -115% of the nominal power of the lamp, for which the electrodes were dimensioned.
- the operation according to the invention makes it possible to operate high-pressure discharge lamps, in particular for projection applications, in the power range, preferably between 20% and 130% of the nominal power.
- a so-called 'eco-mode' is known in the art in which the lamp is operated in a slightly dimmed manner to conserve power and to ensure quieter operation of the projector and prolong the life of the lamp, if not the full light output is needed.
- the lamp could never be dimmed below 70% to 85%, since flickering of the lamp can not be ruled out with the known methods.
- a truly power-saving operating mode is possible because the lamp can be dimmed down to 20% of its nominal power.
- the cooling demand continues to drop and thus also allows a further reduction of the disturbing noise level.
- the electrodes are thermally overloaded. Accordingly, the Energymodu ⁇ lation must be reduced. This can be achieved by the following individual measures, which can optionally also be combined with one another: lowering the lamp frequency, lowering the pulse height, lowering the pulse width, as well as a suitable adaptation of the commutation scheme. If the power changes to less than 85% of the rated power, the electrodes will be too cold and tend to flicker.
- the performance depends on the lamp type, some lamp types can be dimmed with the known methods up to 70% of the nominal power and the inventive method is necessary only below 70% of the nominal power. Accordingly, the energy modulation must be increased. This can be achieved by the following individual measures, which can also be combined if necessary: increasing the lamp frequency, increasing the pulse height, increasing the pulse width, as well as a suitable adjustment of the commutation scheme.
- Fig. 3b shows a waveform for the dimmed operation of
- Fig. 4 is a flowchart of the inventive method for operating a high pressure discharge lamp outside its nominal power range
- Fig. 6 shows the dependence of the light frequency of the lamp power based in each case on the Lampenfre acid sequence or nal réelle the lamp power in nominal.
- Fig.l shows a simple waveform having a commutation pulse according to the prior art, such as reflectors, for example, for LCD-Pro (LCD stands for Liquid Crystal Display) is used.
- LCD-Pro LCD stands for Liquid Crystal Display
- the waveform is divided into full waves and half waves, where the (average) length of a solid wave as l / (f L ) and the (average) length of a half wave as l / (2 * f L ) defi ⁇ ned, where f L the (middle) frequency at which the lamp is operated, also referred to below as lamp frequency.
- Simple symmetrical waveforms are characterized by a single constant lamp frequency. The same applies to the length of the half or full waves.
- Complex waveforms consist of half and full waves of different lengths, so that only a median ⁇ length and thus an average frequency can be given for this.
- the waveform has an input already described commutation pulse, which is defined in more detail here by means of a pulse length and a pulse height.
- the remaining Halbwel ⁇ le, which is not attributable to the commutation pulse is defined as a plateau, with analog definition of Plateau ⁇ length and plateau height.
- the pulse-plateau ratio is defined as the quotient of the pulse height to the plateau height.
- a duty cycle is defined as the quotient of the pulse length to the length of a half-wave.
- the duty cycle thus refers here to a half-wave and not to a solid shaft.
- duty cycle pulse length * 2 * fL.
- Fig. 2a shows a more complex waveform such as reflectors m so-called DLP ⁇ -Pro (DLP stands for Digital Light Processing) are used.
- DLP Digital Light Processing
- the current is modulated often also in the plateau of the half-wave, wherein the modu lation ⁇ is closely matched to the color wheel in the projector.
- the current curve therefore looks more complicated than in FIG. 1, but the above-mentioned definitions continue to apply in principle.
- the pulse-to-plateau ratio is generally not used to describe the relative pulse level, but rather the ratio of pulse current to RMS current.
- I RMS P L / U L is the thermal power or RMS power, which is in control of the power P L by the operating device is ⁇ is, when the lamp has a voltage U L.
- FIG. 2b shows a further complex current profile with several different current levels in the plateau region.
- the plateau area and the commutation pulse are already flowing into each other, so that a definition in some half-waves is not quite easy.
- the commutation should preferably be shortly after one
- FIGS. 3a and 3b An example of an optimization of the waveform with regard to the commutation scheme for a dimmed operation of the high-pressure discharge lamp is shown in FIGS. 3a and 3b.
- Fig. 3a which shows a waveform for the nominal operation of the high pressure discharge lamp
- the waveform has a current overshoot 110 in the plateau and a commutation pulse 111 just before the commutation.
- the commutation pulse 111 is too small, it should fulfill the criteria according to the above table. But it can not be increased arbitrarily, without changing the color rendering of the lamp in an undesirable manner. Therefore, as shown in Fig.
- the commutation is shifted: the Stromüberhö ⁇ Hung 110 in the waveform of Fig. 3a is thus t istspuls 110 in Fig. 3b, and the previous commutation pulse 111 in Fig. 3a then only a current overshoot 111 in Fig. 3b, after which is not commutated.
- the electrodes are heated in a suitable manner before the commutation so that the commutation itself becomes un ⁇ problematic. Exactly the same can be done with over-performance.
- Fig. 4 shows a flow chart of the inventive method for operating a high-pressure discharge lamp except half of its nominal power range.
- the lamp power is set to a corresponding range less than 85% or greater than 110% of the nominal lamp power.
- step 20 it is checked if the lamp is prone to flicker or shows too strong electrical breakdown fire.
- This can be an operating device implementing the method according to the invention, e.g. Judge by changing the lamp voltage. If the lamp voltage does not show any abnormalities, the normal nominal operation waveform is further maintained in step 60
- the optimization parameter n is changed stepwise in step 30 on the basis of the standard waveform and a second time in step 40 it is checked whether the lamp tends to flicker or the electrodes to burn back. If this is the case, it is checked in step 50 whether the parameter is already outside the range according to the above table. If this is not the case, then jump back to step 30 and continue to change the parameters there. If this is the case, then this parameter is not changed further.
- the parameter counter n is incremented by one and it is jumped to step 30, in which then the next parameter is changed step by step. In step 40, no abnormalities measured, the lamp 70 in step with this Para ⁇ parameter set is operated.
- the white light from the lamp is split by dichroic mirrors into the three primary colors red, green and blue. Then, the light is passed through the LCD panels, which determine for each individual image pixel whether the light can pass or be absorbed. Finally, the light is reflected on a prism composed.
- the white light of the lamps is successively separated by a color wheel into the individual primary colors red, green and blue. Subsequently, driven of each individual pixel on movable mirror from the DMD (Di gital ⁇ Mirror Device).
- DMD Di gital ⁇ Mirror Device
- a first limitation is that the lamp should go with the color wheel ⁇ synchronously. Therefore, changes in the frequency are only possible to a limited extent, eg multiple or integer fractions of the color wheel frequency, commutations only in the Spoke (at the boundary) between the color segments.
- the second limitation is the sequential processing of the light.
- a current pulse in a waveform according to the invention is moved in the red color wheel segment in order to raise the red component in the light, then this must be calculated accordingly in the color balance control. This is often Getae ⁇ saturated when the scope of the control software for the DMD chip. If now this pulse is increased in the red or widened, the color matching is no longer correct and the picture gets a reddish. Therefore, such a change in the operating scheme only makes sense if gleichzei ⁇ tig would take place with the change of the pulse, a change of color matching in DMD.
- FIG. 5 shows the operation of a high-pressure discharge lamp with 330 W nominal power at 200 W, corresponding to 60.6% of the nominal power of the high-pressure discharge lamp.
- the 330W high ⁇ pressure discharge lamp is continuously operated at 200W
- mode 1 indicated in Fig. 4 by reference numeral 510, the high pressure discharge lamp is operated with the same scheme as nominal power, but with 200W instead of 330W.
- the slightly melted at nominal power tip solidifies and therefore can release only limited electrons.
- the voltage is about 30V higher than the mode 2, denoted by reference numeral 511, in which frequency and pulse height have been adjusted by the method described above.
- mode 1 in addition to a total of about 30V higher voltage, a clearly visible fluctuation of the burning voltage can be seen. This clearly visible fluctuation of the internal voltage indicates visually in flickering of the high pressure discharge lamp in response to the solidified Elect ⁇ clear peak.
- a Flickerdetetation can thus be done with strong dimming less than 85% of the nominal power on the burning voltage of the lamp.
- a direct observation of the bow approach by means of a suitable Pro etechnischsoptik be useful.
- Such an operation can also be used to a high-pressure discharge lamp high nominal power operated permanently ⁇ way with a significantly lower power to increase their service life. This is usually not possible because the electrodes then become too cold and the lamp can go out or flicker during commutation. With the inventive method, this can be accomplished because the electrodes are heated up accordingly before a commutation, and the average Leis ⁇ processing can still be lowered. However, flicker detection is necessary to ensure stable operation. But this can take the form of an electric
- Circuit in particular in the form of additional software for a digitally operated circuit arrangement, so that No or only little additional costs for the circuit ⁇ arrangement arise.
- Fig. 6 shows the dependence of the lamp frequency of the lamp power relative to the respective lamp frequency or the lamp power in the nominal mode. This dependence is meaningful in a range between an upper limit curve 610 and a lower limit curve 611. The area within these two curves can therefore be used to optimize the lamp frequency.
- An exemplary dimensioning for the Lampenfre acid sequence f L as a function of the lamp power P L is input for example the following already mentioned relationship:
- Operating mode 2 with according to the invention adapted operating parameters lamp frequency and lamp pulse height
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102010039221A DE102010039221A1 (en) | 2010-08-11 | 2010-08-11 | A method of operating a high pressure discharge lamp outside its nominal power range |
PCT/EP2011/063198 WO2012019935A1 (en) | 2010-08-11 | 2011-08-01 | Method for operating a high-pressure discharge lamp outside the nominal power range thereof |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2604098A1 true EP2604098A1 (en) | 2013-06-19 |
EP2604098B1 EP2604098B1 (en) | 2015-10-14 |
Family
ID=44630241
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP11743499.3A Active EP2604098B1 (en) | 2010-08-11 | 2011-08-01 | Method for operating a high-pressure discharge lamp outside the nominal power range thereof |
Country Status (6)
Country | Link |
---|---|
US (1) | US9204520B2 (en) |
EP (1) | EP2604098B1 (en) |
JP (1) | JP5627786B2 (en) |
CN (1) | CN103069927B (en) |
DE (1) | DE102010039221A1 (en) |
WO (1) | WO2012019935A1 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102011089592B4 (en) | 2011-12-22 | 2019-06-19 | Osram Gmbh | DLP projector with current increase, frequency modulation and current height modulation for a discharge lamp and corresponding method |
EP2852261B1 (en) | 2013-09-18 | 2020-06-17 | OSRAM GmbH | Method for determining a predetermined waveform of a lamp current for operating a discharge lamp of a projection apparatus and projection device |
DE102014220275A1 (en) * | 2014-10-07 | 2016-04-07 | Osram Gmbh | Projection apparatus and method for projecting at least one image onto a projection surface |
DE102014220780A1 (en) * | 2014-10-14 | 2016-04-14 | Osram Gmbh | Method for operating a discharge lamp of a projection arrangement and projection arrangement |
JP5756223B1 (en) * | 2014-12-11 | 2015-07-29 | フェニックス電機株式会社 | High pressure discharge lamp lighting device and high pressure discharge lamp lighting method |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1053312C (en) | 1993-10-21 | 2000-06-07 | 皇家菲利浦电子有限公司 | Image projection device and lamp control system for use therein |
DE19731168A1 (en) * | 1997-07-21 | 1999-01-28 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Illumination system |
EP1057376B1 (en) | 1998-12-17 | 2003-10-15 | Koninklijke Philips Electronics N.V. | Circuit arrangement |
DE10021537A1 (en) | 2000-05-03 | 2001-11-08 | Philips Corp Intellectual Pty | Method and device for operating a gas discharge lamp |
JP2003338394A (en) * | 2002-05-21 | 2003-11-28 | Matsushita Electric Ind Co Ltd | Method for lighting high-pressure discharge lamp, lighting device and high-pressure discharge lamp device |
JP2005100786A (en) * | 2003-09-25 | 2005-04-14 | Matsushita Electric Works Ltd | Discharge lamp lighting device |
JP2006286460A (en) * | 2005-04-01 | 2006-10-19 | Harison Toshiba Lighting Corp | Lighting device of high pressure discharge lamp |
JP4448396B2 (en) | 2004-07-13 | 2010-04-07 | 株式会社日立製作所 | Lamp operation control device and method thereof |
US20100264848A1 (en) * | 2005-06-24 | 2010-10-21 | Koninklijke Philips Electronics, N.V. | Method of shutting down a high pressure discharge lamp and driving unit for driving a high pressure discharge lamp |
JP2009528661A (en) * | 2006-03-03 | 2009-08-06 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Method and apparatus for driving discharge lamp |
JP5027498B2 (en) * | 2006-12-25 | 2012-09-19 | パナソニック株式会社 | Discharge lamp lighting device and image display device |
JP4873371B2 (en) | 2007-04-24 | 2012-02-08 | 岩崎電気株式会社 | High pressure discharge lamp lighting device, projector and lighting method of high pressure discharge lamp |
EP2104404B1 (en) | 2008-03-21 | 2012-01-18 | Seiko Epson Corporation | Discharge lamp lighting apparatus, method for controlling the same, and projector |
JP2010055840A (en) * | 2008-08-26 | 2010-03-11 | Panasonic Electric Works Co Ltd | Discharge lamp-lighting device, headlamp device, and vehicle |
-
2010
- 2010-08-11 DE DE102010039221A patent/DE102010039221A1/en not_active Withdrawn
-
2011
- 2011-08-01 WO PCT/EP2011/063198 patent/WO2012019935A1/en active Application Filing
- 2011-08-01 JP JP2013523563A patent/JP5627786B2/en active Active
- 2011-08-01 EP EP11743499.3A patent/EP2604098B1/en active Active
- 2011-08-01 CN CN201180039284.XA patent/CN103069927B/en active Active
- 2011-08-01 US US13/814,268 patent/US9204520B2/en active Active
Non-Patent Citations (1)
Title |
---|
See references of WO2012019935A1 * |
Also Published As
Publication number | Publication date |
---|---|
WO2012019935A1 (en) | 2012-02-16 |
JP2013533600A (en) | 2013-08-22 |
JP5627786B2 (en) | 2014-11-19 |
CN103069927B (en) | 2016-08-17 |
CN103069927A (en) | 2013-04-24 |
EP2604098B1 (en) | 2015-10-14 |
DE102010039221A1 (en) | 2012-02-16 |
US9204520B2 (en) | 2015-12-01 |
US20130134899A1 (en) | 2013-05-30 |
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