Abstract: 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.

Abstract: An image display device accurately evaluates the possibility of problems occurring due to the state of impure gas inside a discharge envelope in a high pressure discharge lamp. The image display device includes the high voltage discharge lamp and an evaluation unit (51) for evaluating the possibility of problems occurring due to the state of impure gas. The evaluation unit (51) includes a high voltage pulse generator (57) that generates a high voltage pulse for breaking insulation in the high pressure lamp, a constant current generator (58) that generates a constant current for illuminating the high pressure discharge lamp in a glow discharge state, a lamp voltage measurer (59) that measures lamp voltage during illumination in the glow discharge state, an LED (63), and a controller (65).

Abstract: 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 V1) and constant power control is performed to maintain the lamp power at a power value W1 if the lamp voltage is equal to or above the switching voltage. After the predetermined condition (5 minutes) is exceeded, the constant power control is performed by lowering the value of the switching voltage from the first voltage value V1 to the second voltage value V2. If the lamp voltage is equal to or above the switching voltage lowered, the lamp power is maintained at power value W1.

Abstract: The present invention provides a high-pressure discharge lamp having a long life. A high-pressure discharge lamp (100) comprises a light emitting part (4); first and second sealing parts (6, 8); first and second electrodes (10, 11); a first conductive lead (21) wound around the first sealing part; a first lead wire (22) electrically connecting the first conductive lead to the first electrode; a second conductive lead (25) wound around the second sealing part; and a second lead wire (26) connecting the second conductive lead to the first electrode. The second lead wire detours the light emitting part to avoid being affected by heat. After the lamp is turned off, the temperature of base parts of the electrodes immediately falls, and much mercury can be collected in the vicinities of the base parts.

Abstract: 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 (S12, S13), and thereafter to switch from the rated frequency to a more audible frequency in accordance with a change in voltage value (S21 to S23).

Abstract: A high-pressure mercury lamp including electrode assemblies and a discharge vessel (23) that is composed of: a main tube part (15) having a discharge space (13) inside; and a sealing part (17) connected to the main tube part. The electrode assemblies extend into the discharge space from and are hermetically sealed with the sealing part such that their tips face each other in the discharge space. The discharge space (13) is filled with mercury as light-emitting material, rare gas such as xenon, and halogen gas for halogen cycle. An electrode assembly is composed of an electrode part (27a), a metal foil (29a), and an external lead. The base part of an electrode inside the discharge space is provided with a liquid collecting coil (43) for holding mercury that gathers around the base part during a cooling period while lighting is off.

Abstract: 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 V1) and constant power control is performed to maintain the lamp power at a power value W1 if the lamp voltage is equal to or above the switching voltage. After the predetermined condition (5 minutes) is exceeded, the constant power control is performed by lowering the value of the switching voltage from the first voltage value V1 to the second voltage value V2. If the lamp voltage is equal to or above the switching voltage lowered, the lamp power is maintained at power value W1.

Abstract: In a high-pressure discharge lamp that includes a bulb formed from a light emitting part having a discharge space therein and a pair of sealing parts connected to the light emitting part, and an electrode pair disposed within the discharge space, a section of a proximity conductor is wound substantially spirally around one of the sealing parts within a predetermined range from the light emitting part, while the remaining section of the proximity conductor crosses over the light emitting part and is electrically connected to the electrode nearer the other sealing part. By initiating a discharge after applying a high-frequency voltage of 1 kHz to 1 MHz to a high-pressure mercury lamp having this structure, the breakdown voltage can be suppressed to at least 8 kV.

Abstract: 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.

Abstract: In a high-pressure discharge lamp that includes a bulb formed from a light emitting part having a discharge space therein and a pair of sealing parts connected to the light emitting part, and an electrode pair disposed within the discharge space, a section of a proximity conductor is wound substantially spirally around one of the sealing parts within a predetermined range from the light emitting part, while the remaining section of the proximity conductor crosses over the light emitting part and is electrically connected to the electrode nearer the other sealing part. By initiating a discharge after applying a high-frequency voltage of 1 kHz to 1 MHz to a high-pressure mercury lamp having this structure, the breakdown voltage can be suppressed to at least 8 kV.

Abstract: A lighting method for a high pressure discharge lamp in which a high-pressure pulse is applied to cause a dielectric breakdown, and then in step S1, it is judged whether the lamp voltage is higher than 25 volts as the current switching voltage. If it is judged negatively in step S1, the control circuit (304) performs a constant current control with the current limiting level set to 6 amperes (step S2). If it is judged that the lamp voltage is higher than 25 in step S1, the control circuit (304) performs a constant current control with the current limiting level set to 4 amperes (step S3). When the lamp voltage rises and reaches 50 volts, the control circuit (304) performs a constant power control so that the lamp power remains to be 200 W.

Abstract: When a detected lamp voltage (Vla) is below a predetermined value (S101: No), an alternating current that is higher in frequency than an alternating current supplied under rated-power operation is supplied (S102) for a predetermined time period (S103). The rated power is 150 W and the higher frequency is 500 Hz.

Abstract: A lighting method for a high pressure discharge lamp in which a high-pressure pulse is applied to cause a dielectric breakdown, and then in step S1, it is judged whether the lamp voltage is higher than 25 volts as the current switching voltage. If it is judged negatively in step S1, the control circuit 304 performs a constant current control with the current limiting level set to 6 amperes (step S2). If it is judged that the lamp voltage is higher than 25 in step S1, the control circuit 304 performs a constant current control with the current limiting level set to 4 amperes (step S3). When the lamp voltage rises and reaches 50 volts, the control circuit 304 performs a constant power control so that the lamp power remains to be 200W.

Abstract: Disclosed are a lighting method for a high-pressure discharge lamp, a lighting apparatus for a high-pressure discharge lamp, and a high-pressure discharge lamp apparatus each suppresses abnormal blackening of a discharge tube that may occur at an initial stage of operation from a discharge start. According to the lighting method of the present invention, the lamp current is reduced upon detection, by an abnormal discharge detector 5021, of an abnormal discharge that is produced between a tip of one electrode and a root of the other electrode.

Abstract: When a detected lamp voltage (Vla) is below a predetermined value (S101: No), an alternating current that is higher in frequency than an alternating current supplied under rated-power operation is supplied (S102) for a predetermined time period (S103). The rated power is 150 W and the higher frequency is 500 Hz.

Abstract: Disclosed is a method for operating a high-pressure discharge lamp, a lighting apparatus, and a high-pressure discharge lamp apparatus each capable of operating the lamp at a power lower than the rated power without imposing excessive burden on the lighting circuit. To this end, when a detected lamp voltage (Vla) is below a predetermined level (S102: No), the current is supplied at a lower frequency than the rated frequency for a predetermined time period (S103 and S104 ).

Abstract: Disclosed are a lighting method for a high-pressure discharge lamp, a lighting apparatus for a high-pressure discharge lamp, and a high-pressure discharge lamp apparatus each suppresses abnormal blackening of a discharge tube that may occur at an initial stage of operation from a discharge start. According to the lighting method of the present invention, the lamp current is reduced upon detection, by an abnormal discharge detector 5021, of an abnormal discharge that is produced between a tip of one electrode and a root of the other electrode.

Abstract: Disclosed is a method for operating a high-pressure discharge lamp, a lighting apparatus, and a high-pressure discharge lamp apparatus each capable of operating the lamp at a power lower than the rated power without imposing excessive burden on the lighting circuit. To this end, when a detected lamp voltage (Vla) is below a predetermined level (S102: No), the current is supplied at a lower frequency than the rated frequency for a predetermined time period (S103 and S104).

Abstract: Apparatus in which a gas such as air, containing nitrogen oxides, is mixed with high temperature steam of 130.degree. to 150.degree.C in a reactor vessel to convert the nitrogen oxides to soluble substances and then dissolve said soluble substances in a liquid absorbent such as warm water or a weak alkaline warm aqueous solution, said liquid absorbent being collected thereafter, so that the nitrogen oxides are separately removed from the gas. The apparatus of the invention has an attainable efficiency of separately removing nitrogen oxides exceeding 95 percent, for gas having the nitrogen oxides content of 100 ppm to 10,000 ppm.