Patent application number | Description | Published |
20110018460 | Discharge lamp lighting apparatus - In an optimum frequency detection sequence of a discharge lamp, the frequency control circuit performs a sweep operation in which, while the frequency control circuit monitors a syntonization degree signal, a frequency control signal is changed, so that frequency is changed, starting from either an upper or lower limit frequency of a periodic driving circuit, in a range that does not exceed the other frequency, wherein after completion of the sweep operation, the frequency control circuit determines a value of the frequency control signal corresponding to a resonance frequency of the resonant circuit, and inputs the value into a frequency driving circuit, wherein at least in a period of the sweep operation, an inverter receives power supply from a sweep time power supply circuit for supplying electric power with constant supply capability, which is limited to a range in which breakdown does not occur in the discharge lamp. | 01-27-2011 |
20110025219 | Discharge lamp lighting apparatus - In a discharge lamp lighting apparatus, in a starting sequence of a discharge lamp, while a frequency control circuit generates a inverter driving signal corresponding to resonance frequency of a resonant circuit, a power supply circuit outputs non-load open circuit voltage that is sufficient to maintain electric discharge, even when a boosting action accompanying a resonance phenomena disappears, and then a periodic drive circuit generates the inverter driving signal to gradually decrease frequency of the inverter from a frequency corresponding to the resonance frequency of the resonant circuit, until the frequency of the inverter reaches a first threshold frequency, and wherein when the frequency of the inverter reaches the first threshold frequency, while the periodic drive circuit generates the inverter driving signal so that the frequency of the inverter turns into a stable lighting frequency, the power supply circuit outputs current that is sufficient to maintain the electric discharge of the discharge lamp. | 02-03-2011 |
20110127926 | Discharge lamp light apparatus - A discharge lamp lighting apparatus for lighting a discharge lamp where a voltage generated in a secondary side winding can be superimposed on an output voltage of an inverter and is impressed between electrodes, where while a periodic drive circuit generates an inverter drive signal so that frequency of the inverter becomes a start-up initial frequency, electric supply control circuit controls a power supply circuit to output no-load opening voltage, where the frequency of the inverter gradually decreases until reaching a first threshold frequency from the start-up initial frequency, where when the frequency of the inverter reaches the first threshold frequency, the periodic drive circuit generates the inverter drive signal so that the frequency of the inverter becomes stable lighting frequency, and where the electric supply control circuit controls the power supply circuit to output current which is sufficient to maintain electric discharge of the discharge lamp. | 06-02-2011 |
20110128508 | Lighting apparatus for high-pressure discharge lamp and projector - A lighting apparatus for a high-pressure discharge lamp that has an electric discharge container made of quartz glass, and containing a pair of counter electrodes and a power supply unit that supplies AC current to the high-pressure discharge lamp. The power supply unit has a stationary power lighting mode and a modulated power lighting mode that supplies current having power less than power in the stationary power lighting mode. The modulated power lighting mode supplies a rectangular AC current having a first term and a second term. A mean high-frequency current value supplied to a first electrode is greater than a mean current value supplied to a second electrode in the first term. A current is supplied to the second electrode for a term longer than the half-cycle period in the second term, the current being lower than the mean high-frequency current value supplied to the first electrode. | 06-02-2011 |
20130301013 | LIGHT SOURCE APPARATUS AND PROJECTOR - A light source apparatus comprises a beam flux conversion optical system for making all the light emitting areas conjugate to one geometrical-optical output image, all the solid light emitting elements being in series connected to each other and fixed to a heat sink to be insulated to one another, circuits on the input and output sides of an electric supply circuit being not insulated, the electric supply circuit including an interface circuit for receiving a modulation amount specifying signal from a host circuit, wherein a ratio of ON time to a switching cycle of the switch element is controlled in a feedback manner so that a difference between current values indicated by the output current signal and a target current signal may become small, and the interface circuit generating analog quantity correlated to the amount of modulation specified by a modulation amount specifying signal through a data insulation transmission unit. | 11-14-2013 |
20130335710 | LIGHT SOURCE APPARATUS AND PROJECTOR - A coherent light source apparatus comprises a first optical system, which has a first light emission region formed by a coherent light source, and which projects light from the first light emission region to form a second light emission region, a light deflection unit which deflects light flux in connection with formation of the second light emission region; a second optical system, which forms a third light emission region in response to the light flux which has been deflected by the light deflection unit, a light mixing unit for mixing a component of an incident light angle and that of a position thereof, and a light deflection unit drive circuit for receiving a periodic optical deflection synchronization signal, thereby driving the light deflection unit, wherein the light deflection unit operates to continuously change a direction in which the light flux is deflected while synchronizing with the optical deflection synchronization signal. | 12-19-2013 |
20140036240 | DISCHARGE LAMP LIGHTING APPARATUS AND PROJECTOR - A polarity-reversal control circuit gives a polarity-reversal order so that the polarity of an inverter is inverted each time the polarity-reversal timing notified by a signal is recognized. The number of times of consecutive appearances of a normal polarity-reversal interval period, in which an interval of adjoining polarity-reversal timings is equal to or less than an upper limit of a polarity-reversal interval desirable for a discharge lamp, is counted, and if the unusual polarity-reversal interval period, in which an interval of the adjoining polarity-reversal timing is longer than the upper limit of a polarity-reversal interval, appears, Npm is memorized as the maximum of the number of times of consecutive appearances and after that, when the polarity-reversals signal in which the number of times of consecutive appearances becomes equal to Npm is received, it is regarded as a start of an unusual polarity-reversal interval period, and additional polarity-reversal order is given. | 02-06-2014 |
20140167641 | HIGH PRESSURE DISCHARGE LAMP LIGHTING APPARATUS - In a lighting apparatus containing a high pressure discharge lamp, an alternating current supplied to the discharge lamp at the time of steady lighting of the frequency (basic frequency) selected from a range between 60 and 1000 Hz and a low frequency having a frequency selected from a range between 5 and 200 Hz lower than the basic frequency is generated alternately. The frequency of the low frequency wave is changed in response to the change of the lighting voltage of the discharge lamp. The supply period of the basic frequency is increased and decreased little by little by every predetermined time. | 06-19-2014 |
20140233090 | LASER LIGHT SOURCE APPARATUS AND TEMPERATURE CONTROL METHOD OF WAVELENGTH CONVERSION ELEMENT IN LASER LIGHT SOURCE APPARATUS - The purpose of the present invention is to make it possible to output stable light by optimizing the wavelength conversion efficiency in a wavelength conversion element without employing an optical detection device such as a photo diode in a laser light source device. A fundamental light wave emitted from a semiconductor laser ( | 08-21-2014 |
20140285872 | LASER LIGHT SOURCE APPARATUS - The fundamental wave light emitted from a semiconductor laser is converted in wavelength by a wavelength conversion element and emitted therefrom. A lightning circuit lights the semiconductor laser, and a temperature control unit | 09-25-2014 |