Patent application number | Description | Published |
20090091272 | PROJECTION-TYPE IMAGE DISPLAY APPARATUS, LIGHTING APPARATUS AND LIGHTING METHOD REALIZING AN EXTENDED LIFETIME - A projection-type image display apparatus includes a high pressure discharge lamp, which utilizes the halogen cycle, and a lamp lighting apparatus that controls lighting of the high pressure discharge lamp. The lamp lighting apparatus performs lamp refresh processing to improve a lamp property. The lamp refresh processing involves performing low power lighting of the high pressure discharge lamp by changing the lighting power of the high pressure discharge lamp to a value that is lower than the rated power, and thereafter performing high power lighting of the high pressure discharge lamp by changing the lighting power to a value that is higher than the lighting power during the low power lighting. | 04-09-2009 |
20090115974 | HIGH PRESSURE DISCHARGE LAMP OPERATION DEVICE, LIGHT SOURCE DEVICE, AND PROJECTION TYPE IMAGE DISPLAY DEVICE - Provided is a method for lighting a high pressure discharge lamp capable of increasing the life thereof. The lighting method is as follows. When the time elapse after lighting up the discharge lamp is within a predetermined condition (e.g. 5 minutes or less), constant current control is performed if the lamp voltage is lower than switching voltage (here, a first voltage value V | 05-07-2009 |
20090278469 | METHOD OF LIGHTING HIGH PRESSURE MERCURY LAMP, LIGHTING DEVICE FOR THE SAME, LAMP SYSTEM AND PROJECTION DISPLAY UNIT - An object of the present invention is to provide a lighting method and the like that can prevent a lamp temperature of each individual high-pressure mercury lamp from being beyond a proper temperature range of a halogen cycle. The lighting method maintains a discharge of the high-pressure mercury lamp that has a function of the halogen cycle. The control is performed as follows. From when the high-pressure mercury lamp is lighted up to when a lamp voltage Vla reaches a first voltage value V | 11-12-2009 |
20100013399 | LIGHTING METHOD FOR A HIGH-PRESSURE DISCHARGE LAMP, LIGHTING CIRCUIT FOR A HIGH-PRESSURE DISCHARGE LAMP, HIGH-PRESSURE DISCHARGE LAMP APPARATUS, AND PROJECTOR-TYPE IMAGE DISPLAY APPARATUS - After startup, a lighting method for a high-pressure discharge lamp is to light the lamp at a rated frequency without switching the frequency for 120 seconds (S | 01-21-2010 |
20100027272 | HIGH-PRESSURE DISCHARGE LAMP, LAMP UNIT AND IMAGE DISPLAY DEVICE - The present invention provides a high-pressure discharge lamp having a long life. | 02-04-2010 |
20100134034 | HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE WITH ALTERNATING CURRENT FREQUENCY TIME PERIODS - The high-pressure discharge lamp lighting device of the invention includes a lighting circuit for supplying an alternating current to a high-pressure discharge lamp to cause lighting, the high-pressure discharge lamp having an arc tube in which a halogen material is enclosed and a pair of electrodes is disposed, and each electrode having a protuberance at a tip thereof. A frequency of the alternating current varies without dependency on operating data that varies as a lighting time of the high-pressure discharge lamp elapses. | 06-03-2010 |
20100181926 | HIGH-PRESSURE DISCHARGE LAMP SYSTEM AND PROJECTOR USING THE SAME - A high-pressure discharge lamp system has a high-pressure mercury lamp | 07-22-2010 |
20110025989 | HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE, HIGH-PRESSURE DISCHARGE LAMP DEVICE USING SAME, PROJECTOR USING SAID HIGH-PRESSURE DISCHARGE LAMP DEVICE, AND HIGH-PRESSURE DISCHARGE LAMP LIGHTING METHOD - Constant current control is performed after the completion of starting operation of a high-pressure mercury-vapor lamp | 02-03-2011 |
20110037402 | HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE - The high-pressure discharge lamp lighting device of the invention includes a lighting circuit for supplying an alternating current to a high-pressure discharge lamp to cause lighting, the high-pressure discharge lamp having an arc tube in which a halogen material is enclosed and a pair of electrodes is disposed, and each electrode having a protuberance at a tip thereof. A frequency of the alternating current varies without dependency on operating data that varies as a lighting time of the high-pressure discharge lamp elapses. | 02-17-2011 |
20110121746 | HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE, HIGH-PRESSURE DISCHARGE LAMP UTILIZING THE SAME, PROJECTOR UTILIZING SAID HIGH-PRESSURE DISCHARGE LAMP, AND HIGH-PRESSURE DISCHARGE LAMP LIGHTING METHOD - A first waveform (a rectangular waveform, for example) is applied as the waveform of the alternating current supplied to a high-pressure discharge lamp for a predetermined time from the beginning of lighting of the lamp and a second waveform (a staircase waveform, for example) is applied as the waveform of the alternating current after the elapse of a predetermined time (100 [s], for example). The alternating current with the first waveform has a lower absolute instantaneous value in a final section of each half-cycle period thereof than in the other sections and the alternating current with the second waveform has a higher absolute instantaneous value in a final section of each half-cycle period thereof than in the other sections. | 05-26-2011 |
20110210680 | HIGH-PRESSURE DISCHARGE LAMP LIGHTING DEVICE, HIGH PRESSURE DISCHARGE LAMP APPARATUS USING THIS, PROJECTOR USING THE HIGH-PRESSURE DISCHARGE LAMP APPARATUS, AND HIGH-PRESSURE DISCHARGE LAMP LIGHTING METHOD - The high-pressure discharge lamp lighting device and a high-pressure discharge lamp apparatus using this of the present invention are able to suppress the excessive drop in the lamp voltage in a high-pressure discharge lamp. | 09-01-2011 |
20120026471 | PROJECTOR, LIGHTING DEVICE FOR HIGH-PRESSURE DISCHARGE LAMP USED IN THE PROJECTOR, AND METHOD FOR LIGHTING HIGH-PRESSURE DISCHARGE LAMP - The projector uses two lamps, which are high-pressure discharge lamps with the same rated power, as light sources. The projector includes: a first alternating-current generator configured to generate a lamp current to be supplied to one of the lamps, based on an input control signal; a second alternating-current generator configured to generate a lamp current to be supplied to the other lamp, based on an input control signal; and a controller configured to control the lamp currents to have a same period and to be out of phase, by inputting a control signal to each of the first and the second alternating-current generators. | 02-02-2012 |
20120074858 | HIGH-PRESSURE DISCHARGE LAMP LIGHT-UP DEVICE, HIGH-PRESSURE DISCHARGE LAMP APPARATUS USING SAME, PROJECTOR USING HIGH-PRESSURE DISCHARGE LAMP APPARATUS, AND LIGHT-UP METHOD FOR HIGH-PRESSURE DISCHARGE LAMP - A high-pressure discharge lamp lighting device that suppresses deterioration and the expansion of inter-electrode distance in a pair of electrodes within a high-pressure discharge lamp, more effectively than conventional technology. The frequency of the AC current supplied to a high-pressure discharge lamp alternates between a first frequency and a second, higher frequency, while the magnitude of the AC current alternates between a first value and a second, higher value. The suppressing effect is realized by repeatedly alternating the frequency and repeatedly alternating between a first period at the first frequency and a second period at the second frequency, with the second, higher-magnitude current being used in the latter and the first current being used in the former. | 03-29-2012 |
20120218526 | HIGH PRESSURE DISCHARGE LAMP WITH START-UP ASSIST MEMBER, LAMP UNIT, LAMP SYSTEM, AND PROJECTOR - The present invention provides a high pressure discharge lamp with a start-up assist member, a lamp unit, and a lamp system that reduce breakdown voltage and provide high design flexibility by reducing restriction on a position of an adjacent conductor. In a high pressure discharge lamp | 08-30-2012 |
20140111109 | HIGH PRESSURE DISCHARGE LAMP LIGHTING DEVICE, PROJECTOR PROVIDED WITH THE SAME, AND HIGH PRESSURE DISCHARGE LAMP LIGHTING METHOD - A calculation processing sub-unit | 04-24-2014 |