| 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 |
