WO2010035368A1 - 高圧放電ランプ点灯装置、それを用いた高圧放電ランプ装置、その高圧放電ランプ装置を用いたプロジェクタ、および高圧放電ランプの点灯方法 - Google Patents
高圧放電ランプ点灯装置、それを用いた高圧放電ランプ装置、その高圧放電ランプ装置を用いたプロジェクタ、および高圧放電ランプの点灯方法 Download PDFInfo
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- WO2010035368A1 WO2010035368A1 PCT/JP2009/001385 JP2009001385W WO2010035368A1 WO 2010035368 A1 WO2010035368 A1 WO 2010035368A1 JP 2009001385 W JP2009001385 W JP 2009001385W WO 2010035368 A1 WO2010035368 A1 WO 2010035368A1
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- discharge lamp
- pressure discharge
- alternating current
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- 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
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- 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
- H05B41/2885—Static converters especially adapted therefor; Control thereof
- H05B41/2887—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage
- H05B41/2888—Static converters especially adapted therefor; Control thereof characterised by a controllable bridge in the final stage the bridge being commutated at low frequency, e.g. 1kHz
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
Definitions
- the present invention relates to a high-pressure discharge lamp lighting device, a high-pressure discharge lamp device using the same, a projector using the high-pressure discharge lamp device, and a high-pressure discharge lamp lighting method.
- projectors are often used together with personal computers for presentations at conferences and the like. In general homes, projectors are also used as home theater applications.
- Such a projector uses the light emitted from the light source to enlarge and project an optical image processed according to the image information.
- the light source is close to a point light source and has a high luminance and high color rendering. Lamps, particularly high pressure mercury lamps, are widely used.
- the high-pressure mercury lamp includes an arc tube in which mercury is enclosed as a luminescent substance in an amount of, for example, 200 [mg / cm 3 ] or more, and a pair of tungsten electrodes are arranged so as to face each other.
- the arc tube uses a so-called halogen cycle action to prevent tungsten, which is a constituent material of the electrode, from scattering and adhering to the inner surface of the arc tube during lighting.
- Halogen substances are also encapsulated.
- the frequency of the alternating current supplied to the high-pressure mercury lamp is detected by detecting the increase / decrease in the distance between the electrodes accompanying the change in the shape of the protrusion.
- a high-pressure discharge lamp device including control means for switching between a first frequency of less than 50 Hz or 750 Hz or more and a second frequency of 50 Hz or more and 700 Hz or less (for example, Patent Document 1).
- Patent Document 1 when the protrusion is reduced and the distance between the electrodes is increased, the protrusion is grown with the alternating current of the second frequency, and conversely, the protrusion is grown.
- the alternating current of the first frequency raises the temperature of the tip of each electrode and evaporates the protrusion.
- the high-pressure discharge lamp device described in Patent Document 1 is configured to repair the shape after the change in the shape of the protrusion, but is supplied to the high-pressure discharge lamp before the shape of the protrusion changes.
- a high-pressure discharge lamp device configured to repeatedly modulate the frequency of the alternating current with two or more different values (for example, Patent Document 2).
- the high-pressure discharge lamp device described in Patent Document 2 can grow a protrusion with an alternating current having a frequency at at least one value and evaporate the protrusion with an alternating current having a frequency at the remaining value.
- the shape of the protrusion is maintained by alternately repeating the growth and evaporation of the portion.
- the protrusions formed at the tip portions of the pair of electrodes grow abnormally, and the distance between the electrodes may decrease excessively.
- the protrusion starts to evaporate in order to switch to the frequency of the alternating current for evaporating the protrusion after the protrusion grows and changes its shape.
- the protrusion sometimes grew abnormally.
- an appropriate shape of the protruding portion can be maintained in a small number of high-pressure discharge lamp devices.
- the protrusions grew abnormally.
- the lamp voltage is excessively lowered, so that the rated power cannot be supplied to the high pressure discharge lamp, and There was a problem that illumination decreased.
- the temperature inside the arc tube of the high-pressure discharge lamp is lowered, and the halogen cycle does not operate properly, leading to blackening of the arc tube.
- An object of the present invention is to provide a high-pressure discharge lamp lighting device capable of performing the above, a high-pressure discharge lamp device using the same, a projector using the high-pressure discharge lamp device, and a method for lighting the high-pressure discharge lamp.
- the high-pressure discharge lamp lighting device is a high-pressure discharge lamp having a luminous tube in which a halogen substance is enclosed and a pair of electrodes each having a protrusion formed at the tip portion are disposed opposite to each other.
- An alternating current is supplied for lighting, and the frequency of the alternating current supplied to the high pressure discharge lamp is set to a first value, a second value higher than the first value, and the first value.
- the period B for supplying the first value of alternating current and the period C for supplying the second value of alternating current are alternately repeated, and the A The length of the period is longer than the period B And to the said third 5.5 cycles 50 cycles following a predetermined period of the alternating current value, and controlling the frequency switching circuit.
- the high pressure discharge lamp device includes a high pressure discharge lamp having an arc tube in which a pair of electrodes each having a halogen substance sealed therein and a protrusion formed at a tip portion are disposed opposite to each other, And a high pressure discharge lamp lighting device for lighting the high pressure discharge lamp.
- a projector according to the present invention includes the high-pressure discharge lamp device.
- the high pressure discharge lamp lighting method includes an arc tube in which a pair of electrodes each having a halogen substance sealed therein and having a protrusion formed at the tip are disposed opposite to each other.
- the frequency is switched to the third value at a predetermined time interval, and the A period for supplying the alternating current of the third value is repeated at the predetermined time interval.
- the first value and the second value are alternately switched to provide a B period for supplying the first value of alternating current, and the second value of alternating current.
- the C period for supplying A is alternately repeated, and the length of the A period is Longer than the period B, and characterized by said third 5.5 cycles 50 cycles following a predetermined period of the alternating current value.
- the frequency of the alternating current supplied to the high pressure discharge lamp is set to a first value, a second value higher than the first value, and a third value equal to or less than the first value.
- a control circuit for controlling the frequency switching circuit Since the alternating currents of the first to third values of the respective frequencies have different frequencies, each has an action of growing or reducing the protrusions formed at the tip portions of the pair of electrodes. Then, by alternately repeating the B period in which the first value of alternating current is supplied and the C period in which the second value of alternating current is supplied, an action in which both the growth action and the reduction action of the protrusion are mixed. Thus, the protrusion can be formed and maintained properly.
- protruding portion is formed in a specific specific shape and that the specific shape is maintained.
- the shape of the protrusion is not particularly limited as long as it is possible to suppress an excessive decrease in the distance between the electrodes and sufficiently suppress the occurrence of arc jump.
- the lighting method of the high-pressure discharge lamp having the above configuration can obtain the same effects as those of the high-pressure discharge lamp lighting device.
- a high-pressure discharge lamp lighting device capable of appropriately forming and maintaining the protrusions at the tip portions of the pair of electrodes in the high-pressure discharge lamp and suppressing an excessive decrease in the lamp voltage, and the same are used. It is possible to provide a high-pressure discharge lamp device, a projector using the high-pressure discharge lamp device, and a lighting method for the high-pressure discharge lamp.
- FIG. 1 It is a block diagram which shows the structure of the high pressure discharge lamp apparatus which concerns on 1st Embodiment. It is a partially cutaway sectional view of the arc tube of the high-pressure mercury lamp according to the first embodiment. It is a figure which shows the structure of the electrode of the high pressure mercury lamp which concerns on 1st Embodiment. It is a partially notched perspective view which shows the structure of the lamp unit which concerns on 1st Embodiment. It is a flowchart which shows operation
- FIG. 1 is a partially cutaway perspective view showing a configuration of a front projector as a projector according to a first embodiment. It is a block diagram which shows the structure of the front projector of FIG. It is a block diagram which shows the structure of the front projector which concerns on 2nd Embodiment. It is a schematic diagram which shows a color wheel, Comprising: (a) is a color wheel with which the center angle of each segment is equal, (b) is a color wheel with which the center angle of each segment is non-uniform
- FIG. 1 It is a figure which shows an example of the waveform of an alternating current of the front projector which concerns on 2nd Embodiment, and a synchronizing signal. It is a perspective view which shows the structure of a rear projector as a projector which concerns on 1st and 2nd embodiment.
- FIG. 1 is a block diagram of a high-pressure discharge lamp device 1 according to the first embodiment of the present invention.
- a high-pressure discharge lamp device 1 includes a high-pressure discharge lamp from a DC power supply circuit 2 connected to an external AC power supply (AC100 [V]) via a high-pressure discharge lamp lighting device 3 (electronic ballast). For example, it is configured to be connected to the high-pressure mercury lamp 4.
- the DC power supply circuit 2 has, for example, a rectifier circuit (not shown), generates a constant DC voltage from a household AC voltage (100 [V]), and supplies it to the high-pressure discharge lamp lighting device 3.
- the high pressure discharge lamp lighting device 3 mainly includes a DC / DC converter 5, a DC / AC inverter 6, a high voltage generator 7, a lamp current detector 8, a lamp voltage detector 9, and a control circuit 10.
- the DC / DC converter 5 receives a PWM (Pulse Width Modulation) control signal from the control circuit 10 and supplies a DC current of a predetermined magnitude to the DC / AC inverter 6. That is, it is necessary to perform control (constant power control) to make the lamp power constant in order to keep the light output of the high-pressure mercury lamp 4 constant during stable lighting (steady lighting state).
- the microcomputer 11 calculates the lamp power based on the lamp current detected by the detector 8 and the lamp voltage detected by the lamp voltage detector 9, and sends a PWM control signal from the PWM control circuit 12 to make it constant. / Send to DC converter 5.
- the DC / DC converter 5 converts the DC voltage from the DC power supply circuit 2 into a DC current of a predetermined magnitude.
- the control circuit 10 sends a PWM control signal to the DC / DC converter 5 so as to perform constant current control in a state where the lamp voltage from when the lamp starts to when the lamp starts up is low, in other words, when the lamp current is high. .
- the “steady lighting state” refers to a state in which the gas pressure in the high-pressure discharge lamp is stabilized at a pressure corresponding to the power by supplying a constant power to the high-pressure discharge lamp.
- “constant current control” after starting operation does not only refer to control for keeping the current value constant, but also to prevent overcurrent from flowing to the lamp when the lamp voltage is low until the lamp starts up. The overall control with restrictions on is shown. Therefore, the case where the current value is not constant is included. However, constant power control performed after the lamp has started up may be interpreted as one of constant current controls, but here, constant power control is not included as one of constant current controls.
- the DC / AC inverter 6 generates a substantially rectangular wave alternating current supplied to the high pressure mercury lamp 4 and functions as a frequency switching circuit that switches the frequency of the alternating current to a predetermined value. Specifically, the DC / AC inverter 6 converts the direct current output from the DC / DC converter 5 into an alternating current of a substantially rectangular wave having a specific frequency determined based on a control signal from the control circuit 10. is doing.
- substantially rectangular wave alternating current includes not only current that forms a complete rectangular wave but also rectangular waves that have some distortion due to overshoot or undershoot immediately after polarity inversion.
- a pulse current is superimposed before polarity reversal every half cycle of the rectangular wave, or a slope is added so that the current value increases with time in every half cycle of the rectangular wave.
- An AC waveform is known in which one cycle of high frequency is added immediately before or after polarity inversion for each half cycle of the rectangular wave, and only the lamp current of the latter half cycle of the added waveform is higher than the current value immediately before the addition. ing.
- the “substantially rectangular wave” includes such a deformed shape by superimposing some component on the basic rectangular wave.
- the high voltage generator 7 includes, for example, a transformer (not shown), promotes dielectric breakdown between the electrodes 19 of the high pressure mercury lamp 4, and generates a high voltage to start the high pressure mercury lamp 4. Applied to mercury lamp 4.
- the lamp current detection unit 8 detects a current (corresponding to a lamp current) flowing in a wiring connecting the DC / DC converter 5 and the DC / AC inverter 6 and outputs a signal indicating the magnitude of the lamp current.
- the lamp voltage detector 9 detects the output voltage (corresponding to the lamp voltage) of the DC / DC converter 5 and outputs a signal indicating the level of the lamp voltage.
- the control circuit 10 includes a microcomputer 11, a PWM control circuit 12, a lighting determination circuit 13, and a timer 14.
- the microcomputer 11 controls the DC / DC converter 5 and the DC / AC inverter 6 in response to the output signal of the lamp current detector 8, the output signal of the lamp voltage detector 9, and the output signal of the timer 14.
- the signal for controlling the DC / AC inverter 6 includes a frequency control signal for controlling the frequency for generating the alternating current. That is, the control circuit 10 sends a control signal to the DC / AC inverter 6 so as to generate alternating currents having different frequencies based on the frequency control signal. Therefore, AC currents of various desired frequencies can be obtained by appropriately changing the setting program of the microcomputer 11.
- the PWM control circuit 12 receives the PWM control signal from the microcomputer 11 and performs PWM control on the DC / DC converter 5.
- the lighting determination circuit 13 detects the lighting of the lamp.
- the timer 14 starts counting when the lighting of the lamp is detected. The operation of the control circuit 10 will be described in detail later.
- the arc tube of the high-pressure mercury lamp 4 is composed of, for example, quartz glass as a material for the envelope, and is formed from a substantially spheroid-shaped light emitting unit 16 at the center of the tube and from both sides thereof. And a substantially cylindrical sealing portion 17 connected so as to extend in the direction.
- mercury which is a light emitting substance, and, for example, argon gas (Ar), krypton gas (Kr), xenon gas (Xe) or A predetermined amount of these two or more mixed gases and iodine (I) or bromine (Br) for the halogen cycle action, or a mixture thereof are enclosed.
- the enclosed amount of mercury is in the range of 150 [mg / cm 3 ] to 390 [mg / cm 3 ]
- the enclosed amount of argon gas (25 ° C.) is 0.01 [MPa] to 1 [MPa].
- one end portions of a pair of tungsten (W) electrodes 19 are disposed so as to be substantially opposed to each other.
- the inter-electrode distance L (see FIG. 2) between the pair of electrodes 19 is set within a range of 0.5 [mm] to 2.0 [mm].
- the electrode 19 includes an electrode rod 20 and an electrode coil 21 attached to one end thereof, as shown in FIG.
- the distal end portion 22 (one end portion) of the electrode 19 has a part of the electrode rod 20 and a part of the electrode coil 21 which are integrally melted, for example, in a substantially hemispherical shape, a substantially spherical shape or a substantially conical shape.
- the electrode 19 returns to the top portion of the electrode 19, particularly the tip portion 22, by the halogen.
- the protrusions 23 are deposited and formed by themselves without mechanical processing.
- the protrusion 23 shown here is formed during the lighting process of the manufacturing process, and is already formed when the product is completed.
- the interelectrode distance L specifically indicates the distance between the protrusions 23.
- the tip of the electrode 19 when forming the tip of the electrode 19 into a shape such as a substantially hemispherical shape, a substantially spherical shape, or a substantially conical shape, for example, a part of the electrode rod 20 and a part of the electrode coil 21 are formed by melting each.
- the electrode rod 20 may be attached to the tip of the electrode rod 20 that has been previously cut into a substantially hemispherical shape, a substantially spherical shape, or a substantially conical shape, or sintered in such a shape.
- the other end of the electrode 19 is connected to one end of the external lead wire 25 via a molybdenum metal foil 24 hermetically sealed to the sealing portion 17.
- the other end portion of the external lead wire 25 protrudes from the end surface of the sealing portion 17 and is connected to a power supply line or a base (not shown).
- Such a high-pressure mercury lamp 4 is incorporated in a reflecting mirror 26 to constitute a lamp unit 27 as shown in FIG.
- the lamp unit 27 includes the high-pressure mercury lamp 4 described above, and a reflecting mirror 26 whose base has a reflecting surface 28 having a concave inner surface, made of glass or metal.
- the high-pressure mercury lamp 4 is incorporated in the lamp 26 so that the central axis X in the longitudinal direction substantially coincides with the optical axis Y of the reflecting mirror 26 and the light collecting efficiency by the reflecting mirror 26 is increased. The light is reflected by the reflecting surface 28.
- the high-pressure mercury lamp 4 is provided with a cylindrical base 30 with a power connection terminal 29 attached to one sealing portion 17 of the arc tube.
- An external lead wire 25 led out from one sealing portion 17 is connected to a power connection terminal 29.
- a power supply line 31 is connected to the other external lead wire 25.
- the base 30 is inserted into the neck portion 32 of the reflecting mirror 26 and fixed with an adhesive 33. At this time, the power supply line 31 is inserted through the through hole 34 provided in the reflecting mirror 26.
- the reflecting surface 28 is made of, for example, a spheroid surface or a rotating paraboloid surface, and a multilayer interference film or the like is deposited thereon.
- FIG. 5 is a flowchart showing modulation control of alternating current in the high pressure discharge lamp lighting device 3. However, the starting operation described later in the flowchart of FIG. 5 is omitted. (1) First, when a lighting switch (not shown) for starting the discharge of the high-pressure mercury lamp 4 is turned on, the control circuit 10 causes the high voltage generator 7 to supply, for example, 3 [kV], 100 [kHz].
- the generated high frequency high voltage is applied to the high pressure mercury lamp 4.
- a high-frequency arc discharge current starts to flow between the electrodes 19. That is, the high pressure mercury lamp 4 starts discharging.
- a high-frequency voltage is continuously applied to the high-pressure mercury lamp 4 for a certain period after the start of discharge.
- a warm-up period of the electrode 19 to further stabilize the discharge for example, a high-frequency constant current control selected from a range of 10 [kHz] to 500 [kHz] is performed for 2 [seconds].
- a high-frequency constant current control selected from a range of 10 [kHz] to 500 [kHz] is performed for 2 [seconds].
- the output from the high voltage generator 7 for starting the discharge of the high pressure mercury lamp 4 is not limited to a high frequency high voltage, but instead is a known intermittent oscillation type high voltage. Pulses may be used.
- the method for stabilizing the arc discharge after the start of the discharge is not limited to the high frequency operation. Instead, a known direct current operation or a constant current control operation with a low frequency current of less than 20 [Hz] is used. Also good. (3) After the start-up operation, the operation shifts to lighting of constant current control (for example, 3 [A] constant) by an alternating current of a substantially rectangular wave.
- the control circuit 10 turns on the high-pressure mercury lamp 4 by constant current control until the lamp voltage increases with the evaporation of mercury and reaches a predetermined voltage (for example, 60 [V]). On the other hand, the control circuit 10 determines whether or not lighting has started based on the output signal of the lamp current detector 8. When the lighting starts as shown in FIG. 5, the control circuit 10 starts counting of the timer 14 (S11), and inputs the control signal d to the DC / AC inverter 6 (S12).
- the control signal d is a signal for specifying the frequency of the alternating current supplied to the high-pressure mercury lamp 4 to a predetermined value, for example, 135 [Hz].
- the DC / AC inverter 6 specifies the frequency from the control signal d and executes the polarity inversion operation of the alternating current.
- the set time of the timer 14 is selected from the range of 60 [seconds] to 300 [seconds], and 100 [seconds] is selected in this embodiment.
- the control circuit 10 maintains the input of the control signal d to the DC / AC inverter 6 until 100 [seconds] has elapsed from the start of lighting (S13: NO). If 100 [seconds] have elapsed from the start of lighting, the high-pressure mercury lamp 4 is in a steady lighting state, and the control circuit 10 executes modulation control of an alternating current of a substantially rectangular wave (S13: YES).
- the control circuit 10 starts measuring the predetermined time E (predetermined time interval) when 100 [seconds] have elapsed from the start of lighting (S14). (7) Next, the control circuit 10 inputs the control signal b to the DC / AC inverter 6 (S15).
- the control signal b is a signal for specifying the frequency of the alternating current in the B period as the first value. Thereby, the alternating current of the first value specified by the control signal b is output from the DC / AC inverter 6 and supplied to the high-pressure mercury lamp 4.
- the control circuit 10 maintains the input of the control signal b to the DC / AC inverter 6 until the B period elapses (S16: NO), and if the B period elapses (S16: YES), the control signal b Is switched to the control signal c (S17).
- the control signal c is a signal for specifying the frequency of the alternating current in the C period as the second value. As a result, the alternating current of the second value specified by the control signal c is output from the DC / AC inverter 6 and supplied to the high-pressure mercury lamp 4.
- the control circuit 10 maintains the input of the control signal c to the DC / AC inverter 6 until the C period elapses (S18: NO), and if the C period elapses (S18: YES), the predetermined time E (S19). (10) At this time, when the predetermined time E has not elapsed (S19: NO), the control circuit 10 switches from the control signal c to the control signal b (S15), returns to (7), and after S15. Continue to operate. (11) When the predetermined time E has elapsed (S19: YES), the measurement of the predetermined time E is reset (S20), and the control circuit 10 switches from the control signal c to the control signal a (S21).
- the control signal a is a signal for specifying the frequency of the alternating current in the A period as the third value.
- the AC current having the third value specified by the control signal a is output from the DC / AC inverter 6 and supplied to the high-pressure mercury lamp 4.
- the control circuit 10 maintains the input of the control signal a to the DC / AC inverter 6 until the A period elapses (S22: NO), and if the A period elapses (S22: YES), the control circuit 10 Switches from the control signal a to the control signal c (S23).
- the alternating current of the second value specified by the control signal c is output from the DC / AC inverter 6 and supplied to the high-pressure mercury lamp 4.
- the control circuit 10 maintains the input of the control signal c to the DC / AC inverter 6 until the C period elapses (S24: NO), and if the C period elapses (S24: YES), the control signal c Is switched to the control signal b (S15), the process returns to (7), and the operation after S15 is continued. (14) Thereafter, the control circuit 10 repeats a series of steps S15 to S24 until the lighting switch is turned off.
- the A period for supplying the alternating current of the third value is repeated at intervals of the predetermined time E, and the B period for supplying the alternating current of the first value during the predetermined time E, and , And the control for alternately repeating the C period for supplying the alternating current of the second value is realized. More specifically, during the predetermined time E, after the A period, the period is switched to the C period, and thereafter, the B period and the C period are alternately repeated, and the control is performed so that the last is the C period. Is called.
- the first to third values, the A to C periods, and the predetermined time E are set as follows.
- the first value is selected from the range of 20 [Hz] to 200 [Hz], and the length of the B period is set to the cycle selected from the range of 0.5 to 10 cycles.
- the second value is selected from a range of 300 [Hz] to 1000 [Hz], and the length of the C period is set to a cycle selected from a range of 2 cycles to 200 cycles.
- the third value is selected from a range of 15 [Hz] or more and 150 [Hz] or less that is equal to or less than the first value. In this case, it is more preferable to set the third value to be lower than the first value.
- the length of the A period is set to a period longer than the B period and selected from a range of 5.5 cycles or more and 50 cycles or less. This A period is set to repeat at a predetermined time E interval.
- the predetermined time E is a time from the start time of the A period to the start time of the next A period, and is selected from the range of 1 [second] to 300 [second].
- the first to third values, the periods A to C, and the predetermined time E are preferably set according to the specifications of the high-pressure mercury lamp 4, such as rated lamp power, lamp current, and lamp voltage.
- FIG. 6 shows an example of a substantially rectangular wave alternating current waveform in a steady lighting state obtained by the above operation.
- the first to third values, the periods A to C, and the predetermined time E are set as follows.
- the first value is 65 [Hz], and the length of the B period is 0.5 period.
- the second value is 340 [Hz], and the length of the C period is 10 cycles.
- the third value is 55 [Hz] and the length of period A is 6.5 cycles. And the predetermined time E which repeats A period is set to about 30 [seconds].
- the B period and the C period are alternately repeated a plurality of times, before and after each A period. Are each provided with a C period. In FIG. 6, a part between the A period and the next A period is omitted.
- the phase of the alternating current in each B period is controlled to be alternately opposite in the order in which the B period appears. More specifically, since the length of the B period is an odd multiple of 0.5 cycles and the length of the C period is a multiple of 0.5 cycles, from the B period to the C period and the B period The phase of the alternating current in the B period after the repetition is reversed from the phase of the alternating current in the previous B period. Since the AC current in the C period is linked to the phase of the AC current in the B period, the phase of the AC current is alternately reversed in the order in which the C period appears, similarly to the phase of the AC current in the B period. .
- the phase of the alternating current in the A period is controlled to be alternately opposite in the order in which the A period appears.
- the length of the A period is an odd multiple of 0.5 period, similar to the length of the B period, and in this embodiment, the B period is set to repeat an even number of times during the predetermined time E. Yes.
- the phase of the alternating current in the next A period is opposite to the phase of the alternating current in the previous A period.
- the positive electrode and the negative electrode in the pair of electrodes 19 The balance of the frequency of occurrence can be kept. That is, since the balance between the growth and the decrease in the protruding portion 23 of each electrode 19 can be achieved, the protruding portion 23 can be appropriately formed and maintained.
- the growth of the protrusion 23 of the electrode 19 can be promoted by supplying the alternating current of the first value to the high-pressure mercury lamp 4.
- the protrusion 23 is grown so as to have a large diameter (see FIG. 7A). In this case, as the diameter increases, the height h of the protrusion 23 increases, and the protrusion 23 grows in a direction in which the interelectrode distance L decreases.
- FIGS. 7A and 7B the shape of the protrusion 23 is exaggerated in order to make it easy to understand the growth and decrease of the protrusion 23.
- the protrusion 23 of the electrode 19 can be reduced. Specifically, the protrusion 23 is reduced so as to be reduced in diameter (see FIG. 7B). In this case, the protrusion 23 is reduced, the height h of the protrusion 23 is reduced, and the protrusion 23 is reduced in the direction in which the interelectrode distance L is increased. Therefore, by alternately repeating the B period and the C period, an action in which both the growth action and the reduction action of the protrusion 23 are mixed is obtained, and the protrusion 23 can be appropriately formed and maintained.
- FIG. 8 is a table showing the results of voltage transition in the lighting test.
- the high-pressure discharge lamp device 1 according to the present embodiment and the high-pressure discharge lamp device 1 have three different set periods indicating the length of the A period. The test result with a high-pressure discharge lamp device is shown.
- common components will be described using the same reference numerals for simplicity.
- the high-pressure mercury lamp 4 of each high-pressure discharge lamp device has a rated power of 180 [W] and a rated current of 3 [A].
- switching of the frequency of the alternating current supplied to the high-pressure mercury lamp 4 is such that the first value is 65 [Hz], the length of the B period is 0.5 cycle, the second value is 340 [Hz], and the C period. Is controlled to 10 cycles, the third value is 55 [Hz], the length of the A period is a predetermined cycle, and the predetermined time E is about 30 [seconds]. That is, except for the length of the period A, the configuration is the same as the example of the waveform of the alternating current shown in FIG.
- Test-1 shows the voltage transition when the length of the period A is 0.0 cycle and the frequency of the alternating current is alternately switched between the first value and the second value. Yes.
- Test-2 shows the voltage transition when the length of period A is set to 4.0 cycles selected from the range of 0.5 cycles or more and less than 5.5 cycles.
- the length of the period A is set to 6.5 periods longer than the period B and selected from the range of 5.5 to 50 periods, and the alternating current waveform shown in FIG. It shows the voltage transition when current is supplied.
- Test-4 shows the voltage transition when the length of the A period is set to 60.0 periods selected from periods exceeding 50 cycles.
- the lamp voltage at the start of each test-1 to test-4 is 75 [V].
- the halogen cycle acts actively in the initial stage (for example, within 100 hours) of the cumulative lighting time in the high-pressure mercury lamp 4, it is considered that there is a high possibility that the protrusion 23 abnormally grows in the initial stage. . Therefore, in the test results shown in FIG. 8, the lamp voltage after 100 hours of cumulative lighting is used as a comparison target.
- the lamp voltage of test-1 is 53 [V]
- the lamp voltage of test-2 is 57 [V]
- 75 [V] at the start of the test is shown. ]
- the lamp voltages of Test-1 and Test-2 are excessively decreased.
- the illuminance of the high-pressure mercury lamp 4 decreases, the temperature inside the arc tube of the high-pressure mercury lamp 4 decreases, the halogen cycle does not operate properly, and the arc tube is blackened.
- the lamp voltage of test-3 is 62 [V] after 100 hours of cumulative lighting time, and compared to the lamp voltage of test-1 and test-2, although the voltage is lower than that at the start of the test. It can be seen that the voltage drop is suppressed.
- the lamp voltage of Test-4 is 76 [V] after 100 hours of cumulative lighting time, which is a little higher than that at the start of the test. In Test-4, it can be seen that the lamp voltage after the cumulative lighting time of 2000 hours is excessively increased to 135 [V].
- the excessive rise in the lamp voltage is caused by the fact that the length of the period A is set to exceed 50 cycles, whereby the evaporation and decrease of the protrusion 23 proceed excessively and the inter-electrode distance L increases excessively. To do.
- the increase in the distance L between the electrodes results in an increase in the arc length, and the light collection efficiency by the reflecting mirror 26 is reduced, so that the illuminance of the high-pressure mercury lamp 4 is reduced.
- Test-2 even if a cycle other than 4.0 cycles is selected in the range of 0.5 cycle or more and less than 6 cycles for the length of period A, as in the test-2 result shown in FIG. It has been confirmed that the lamp voltage decreases to 60 [V] or less. Further, even if a cycle exceeding 50 cycles and other than 60.0 cycles is selected in Test-4, the lamp voltage increases as the cumulative lighting time approaches 2000 hours, as in the result of Test-4 shown in FIG. It has been confirmed that it rises excessively.
- the high-pressure discharge lamp lighting device 3 makes the length of the A period longer than the B period and a predetermined period of 5.5 cycles or more and 50 cycles or less. It is possible to effectively avoid a state where the temperature of the tip portion 22 is temporarily raised and the balance between the growth and the decrease of the protrusion 23 becomes excessive. Thereby, an excessive decrease in the interelectrode distance L can be suppressed, and an excessive decrease in the lamp voltage can be suppressed.
- ⁇ Setting range of each frequency value, each period and predetermined time E> Next, the setting range in the first to third values, the A to C periods, and the predetermined time E will be described.
- the direct current lighting element is strengthened and the anode 22 is heated at the tip 22 of the electrode 19. May become higher than necessary, the growth action of the protrusion 23 may be impaired, and the protrusion 23 may be deformed or evaporated.
- the first value exceeds 200 [Hz]
- the direct current lighting element becomes too weak, and the temperature of the tip portion 22 of the electrode 19 is not sufficiently high. The case where the part 23 deform
- the first value is in the range of 20 [Hz] or more and 200 [Hz] or less, if the length of the B period exceeds 10 cycles, the temperature of the tip 22 is more than necessary due to the DC lighting element. If the length of the B period is less than 0.5 period, the temperature of the tip 22 of the electrode 19 is not sufficiently high, and the protrusion 23 may be deformed or decrease in evaporation. May deform or decline. Thus, in order to promote the growth of the protrusion 23, the first value is in the range of 20 [Hz] to 200 [Hz], and the length of the B period is in the range of 0.5 to 10 cycles. Is set to the cycle.
- the second value exceeds 1000 [Hz]
- the high-frequency lighting element is strengthened and the action of the evaporated tungsten ions returning to the protrusion 23 of the electrode 19 becomes too weak, and the action of reducing the diameter of the protrusion 23 is increased.
- tungsten ions may be deposited in a portion other than the tip portion 22 of the electrode 19 and the entire shape of the tip portion 22 may be deformed and reduced.
- the second value is less than 300 [Hz]
- the high-frequency lighting element becomes too weak to obtain an effect of reducing the diameter of the protrusion 23 of the electrode 19, and the growth of the protrusion 23 becomes excessive.
- the interelectrode distance L may be excessively reduced.
- the second value means a value of one frequency, and an average value in a plurality of types of frequencies selected from a range of 210 [Hz] to 1000 [Hz] (hereinafter, both average frequencies). May mean).
- the plurality of types of frequencies are repeated in a predetermined order every 0.5 cycles during the C period.
- the “average frequency” here is the sum of the frequency values for every 0.5 period in all of the C periods, and the total obtained is divided by the number of 0.5 periods repeated in the C period. It means the value obtained by doing.
- a frequency of less than 210 [Hz] is present in the plurality of types of 0.5 cycle frequencies, even if the frequency is generated intermittently even in the 0.5 cycle, the action of the first value, that is, the protrusion 23 Since the growth effect appears, the effect of reducing the diameter cannot be obtained.
- the second value is in the range of 300 [Hz] to 1000 [Hz]
- the length of the C period exceeds 200 cycles, the diameter of the protrusion 23 is reduced by the high-frequency lighting element. If the length of the C period is less than two cycles, the effect of reducing the diameter of the protrusion 23 cannot be obtained, and the protrusion 23 grows. May be excessive.
- the second value is in the range of 300 [Hz] to 1000 [Hz], and the length of the C period is 2 cycles or more and 200 cycles or less. It is set to a predetermined cycle.
- the third value is less than 15 [Hz]
- the instantaneous rise in the temperature of the tip portion 22 of the electrode 19 becomes excessive, and the entire shape of the electrode 19 as well as the protrusion 23 may be deformed or evaporated. Can happen.
- the third value exceeds 150 [Hz]
- the temperature of the tip 22 of the electrode 19 cannot be temporarily increased, and the protrusion 23 may not be able to evaporate. Accordingly, in order to evaporate and reduce the protrusion 23, the third value is set within a range of 15 [Hz] to 150 [Hz].
- the predetermined time E for repeating the A period is less than 1 [second]
- the frequency of temporarily increasing the temperature of the tip 22 of the electrode 19 becomes excessive, and not only the protrusion 23 but also the tip 22 of the electrode 19. There may be cases where deformation or evaporation diminishes overall.
- the predetermined time E exceeds 300 [seconds]
- the temperature of the tip 22 of the electrode 19 may be temporarily raised less frequently, and the effect of evaporating and reducing the protrusion 23 may not be obtained. Accordingly, the predetermined time E is set within a range of 1 [second] to 300 [second].
- the first to third values, the length of the period A to C, and the predetermined time E can be adjusted individually or mutually, so that they match the specifications of the high-pressure discharge lamp.
- the lengths of the periods A to C are each a multiple of 0.5 cycles, and for example, 0.3 cycles or 0.7 cycles are not set.
- the predetermined time E is a time from the start time of the A period to the start time of the next A period, and therefore, after the start of measurement of the predetermined time E (S14), the start of the first A period (S21) Until the A period is not included in the predetermined time E, and the B period and the C period are repeated many times as much as the time period of the A period, but the influence is small, and the B period and the C period are repeated many times.
- the protrusion 23 does not grow abnormally.
- the time from the start of measurement (S14) to the start of the first A period (S21) is set to a configuration different from the present embodiment, for example, a time that is shorter than the predetermined time E by the A period. You can also. ⁇ Projector> Next, a projector using the high pressure discharge lamp device 1 will be described.
- FIG. 9 shows a schematic configuration of a front projector 35 as an example of a projector in which the high-pressure discharge lamp device 1 is used.
- the front projector 35 is a type of projector that projects an image toward a screen (not shown) installed in front of the front projector 35.
- the front projector 35 uses three transmissive liquid crystal panels, which will be described later, as image display devices.
- the front projector 35 includes a lamp unit 27 that is a light source, an optical unit 37, a control unit 38, a projection lens 39, a cooling fan unit 40, a power supply unit 41, and the like housed in a housing 36.
- the power supply unit 41 includes the DC power supply circuit 2 and the high-pressure discharge lamp lighting device 3 described above, and converts power supplied from a commercial power supply into power suitable for the control unit 38, the lamp unit 27, and the cooling fan unit 40. Supply each.
- the top panel of the housing 36 is shown in a state where the top panel is removed in order to make the configuration of the front projector 35 easier to see.
- FIG. 10 shows a specific configuration example of the front projector 35 using three transmissive liquid crystal panels as an image display device.
- the optical unit 37 includes a mirror group 65 including a dichroic mirror, three transmissive liquid crystal panels 66R, 66G, and 66B corresponding to the three primary colors R, G, and B, and a prism 70.
- the light emitted from the lamp unit 27 passes through the mirror group 65 and is separated into light of three colors R, G, and B, and is transmitted to the respective liquid crystal panels 66R, 66G, and 66B.
- the liquid crystal panels 66R, 66G, 66B are driven by the control unit 38 so that images according to respective video signals corresponding to R, G, B are displayed.
- the light of the three colors R, G, and B transmitted through the liquid crystal panel is synthesized by the prism 70 and displayed on a screen (not shown) via the projection lens 39.
- the image display system of the projector includes a system for simultaneously synthesizing and projecting images of the three primary colors using the above-described three image display devices corresponding to the three primary colors R, G, and B, and only one image display. There is a method of projecting each color image as a primary color in time series using a device.
- FIG. 11 shows a specific configuration example of a single-plate DLP type front projector.
- the front projector 35 includes an optical unit 37 having three transmissive liquid crystal panels 66R, 66G, and 66B.
- the optical unit having one DMD panel is different. Note that the same components as those of the front projector 35 illustrated in FIG. 10 are denoted by the same reference numerals for the sake of simplicity, and description thereof is omitted.
- the optical unit 56 included in the front projector 55 sandwiches the two lenses 57 and 58 provided on the optical path, the color wheel 50 disposed between the two lenses 57 and 58, and the lens 58 on the optical path.
- a single DMD panel 59 which is an image display device disposed on the side opposite to the color wheel 50.
- the color wheel 50 is divided into three segments of three primary colors R, G, and B plus a white W filter at equal angles on the circumference. Has been placed.
- the color wheel 50 rotates at a high speed at an integral multiple of the frequency of the video input signal (see FIG. 11). In the present embodiment, the frequency of the video input signal is 60 [Hz].
- the front projector 55 transmits the light from the lamp unit 27 through the color wheel 50 that rotates at high speed via the lens 57, so that the four colors of light of R, G, B, and W are time-divisionally divided into DMD panels. 59 can be irradiated.
- the DMD panel 59 is controlled by the control unit 38 so that the built-in micromirror reflects in accordance with each video signal corresponding to each color. Then, the R, G, B, and W image light reflected by the DMD panel 59 is displayed on a screen (not shown) via the projection lens 39. Since each color image is switched at a high speed in time series, it is perceived by the human eye as a mixed color and as a target projection image.
- the timing of the polarity reversal operation of the AC current applied to the lamp unit 27 is set from the viewpoint of image quality. It is common to synchronize with. Specifically, the emitted light from the lamp is transmitted for each boundary line 50a (see FIG. 12A) that is the boundary between the color segments of the color wheel 50, or for each timing when the light passes through the plurality of boundary lines 50a.
- the high-pressure discharge lamp 4 is started and the fact that the arc discharge is stabilized is detected from the electrical characteristics of the lamp or the elapsed time after the start, and then the high-pressure discharge lamp lighting device 3 waits for the synchronization signal.
- the high-pressure discharge lamp lighting device 3 reacts to the synchronization signal sent from the control unit 38 and performs the polarity inversion operation of the alternating current. In this way, the coincidence of timing between the polarity inversion operation of the alternating current and the rotation period of the color wheel is achieved.
- FIG. 13 shows a waveform example of an alternating current to which the present invention is applied in a configuration using a color wheel 50 in which segments of each color are divided and arranged at equal angles.
- the angles of the B, G, R, and W segments in the color wheel 50 are all 90 degrees (see FIG. 12A).
- the color wheel 50 has a rotation speed of 10800 [r.] Corresponding to 180 [Hz], which is three times the video input signal frequency. p. m], and the high-pressure mercury lamp 4 having the same rated power of 180 [W] as that of the first embodiment is used as the light source.
- the first to third values, the periods A to C, and the predetermined time E are set as follows.
- the first value is 45 [Hz]
- the length of the B period is 0.5 period
- the color wheel rotates twice during that period.
- the second value is 360 [Hz]
- the length of the C period is 16 cycles
- the color wheel rotates 8 times during that period.
- the third value is 45 [Hz]
- the length of period A is 6.5 cycles
- the color wheel rotates 26 times during that period.
- the predetermined time E for repeating the A period is set to about 30 [seconds].
- the B period and the C period are alternately repeated a plurality of times between the A period and the next A period, and the C period is provided before and after each A period. It has been.
- the phase of the alternating current in each B period is controlled to be alternately opposite in the order in which the B period appears.
- the phase of the alternating current in the A period is controlled to be alternately opposite in the order in which the A period appears.
- FIG. 12B shows a color wheel 51 in which the angle of the R segment is increased and the angle of the W segment is decreased.
- FIG. 14 shows a waveform example of an alternating current to which the present invention is applied in a configuration using a color wheel 51 in which segments of each color are divided and arranged at unequal angles.
- the angles of the B, G, R, and W segments in the color wheel 51 are 85 degrees for the B segment, 95 degrees for the G segment, 120 degrees for the R segment, and 60 degrees for the W segment.
- the color wheel 51 has a rotational speed of 10800 [r.] Corresponding to 180 [Hz], which is three times the video input signal frequency. p. m], and the high-pressure mercury lamp 4 having the same rated power of 180 [W] as that of the first embodiment is used as the light source.
- the first and third values, the periods A to C, and the predetermined time E are set to be the same, but the color wheel to be used In addition to being different, the frequency configuration of the alternating current supplied in the period C is different.
- the alternating current supplied in the period C is fixed at 360 [Hz] and one frequency
- the period is composed of four types of 0.5 cycle frequencies of 270 [Hz], 341 [Hz], 381 [Hz], and 540 [Hz]. Therefore, the second value in the waveform example shown in FIG. 14 is an average value of these four types of frequencies of 0.5 periods.
- 0.5 period of 381 [Hz] for the B segment 0.5 period of 341 [Hz] for the G segment, and 270 [Hz] for the R segment.
- the waveform example shown in FIG. 14 has a longer R color generation time than the waveform example shown in FIG. 13, so that the R color utilization ratio is increased and the color reproducibility of the projected image is improved. it can.
- Waveform example 3 In order to further improve the color reproducibility of the projected image, in addition to using a color wheel in which the rotation angles of the four color segments are unevenly arranged as described above, the amount of light transmitted through the lamp for each color segment is also reduced. Methods of changing are known. For example, by controlling the amount of light emitted from the lamp unit 27 so as to increase the amount of light that passes through the R segment and decrease the amount of light that passes through the W segment, the usage ratio of the R color further increases, thereby further improving the color reproducibility of the projected image. Can be increased.
- the control of the quantity of light emitted from the lamp unit 27 can be realized by controlling the increase / decrease of the current by the microcomputer 11 in the high pressure discharge lamp lighting device 3.
- FIG. 15 shows a waveform of an alternating current to which the present invention is applied when the configuration using the color wheel 51 in which each segment is divided and arranged at an unequal angle and the above-described emission light amount control, that is, the current increase / decrease operation method are combined. An example is shown.
- the waveform example shown in FIG. 14 has the same settings for the first to third values, the periods A to C, the predetermined time E, and the color wheel.
- the current value is constant between the segments, whereas in the waveform example shown in FIG. 15, the amount of light transmitted through each segment of the color wheel is changed. The current values are different between the segments.
- the current increase / decrease for each segment is ⁇ 0% (100% of the B and G segments when the current value in the waveform example shown in FIG. 14 is 100%. Current), + 10% (110% current) for the R segment, and -10% (90% current) for the W segment.
- the current increase in the R segment is biased to only one of the pair of electrodes 19 in a certain C period, and is biased only to the other electrode 19 in the next C period.
- the increase in current in the pair of electrodes 19 is alternately applied to both electrodes 19. And the balance of decline is balanced.
- the C period is set to be long, the period during which the current increase is applied to one of the electrodes becomes long. Therefore, the balance between the growth and the decrease in the protruding portion 23 of the electrode may be lost during the C period. is there.
- FIG. 16 shows a waveform example of an alternating current for preventing the current increase in the R segment during the C period from being biased to one electrode.
- the waveform example shown in FIG. 16 and the waveform example shown in FIG. 15 are different in the polarity inversion operation setting in the AC current in the C period, the frequency configuration, and the second value that is the average value thereof.
- the first and third values, the A and B periods, and the predetermined time E are set to be the same as those in the AC current waveform example shown in FIG.
- the alternating current in the C period is 223 [Hz], 270 [Hz]. ], 341 [Hz], 381 [Hz], and 540 [Hz], which are composed of five types of 0.5 cycle frequencies, and include a frequency of 0.5 cycles of 223 [Hz]. 15 is different from the waveform example shown in FIG. Specifically, in the C period of the waveform example shown in FIG.
- the case where the current wheel increase / decrease operation method is combined with the configuration using the color wheel 51 in which each segment is divided and arranged at an unequal angle is shown.
- the color wheel 50 having a uniform rotation angle is used. Even if the current increase / decrease operation method is combined with the configuration, the color reproduction performance can be improved or the desired color reproduction performance can be improved.
- the configuration of the color wheel and the method of increasing / decreasing the current for increasing the usage ratio of the R color aiming at improving the color reproducibility have been shown. Even when the utilization ratio is increased, the present invention can be similarly applied.
- the color wheel configuration and current increase / decrease method may be devised for the purpose of improving the screen illuminance in addition to the improvement of color reproducibility. Is possible as well.
- a 5-color or 6-color segment obtained by adding the yellow Y filter or the cyan C filter to the above four colors, or the R filter, G filter, and B filter of the three primary colors, the Y filter, and the C filter.
- the present invention can be similarly applied to a six-color segment to which a filter and a magenta M filter are added.
- a specific example of synchronization signal sent from the control unit 38 and a synchronization method in which the high-pressure discharge lamp lighting device 3 performs the polarity inversion operation of the alternating current in response to the synchronization signal will be described.
- this synchronization method there are a first synchronization method for generating a synchronization signal for each rotation of the color wheel and a second synchronization method for generating a synchronization signal for each switching of each color segment of the color wheel.
- FIG. 17 shows a synchronization signal generated by the control unit 38 in accordance with the start timing of the W segment of the color wheel 51.
- FIG. 17 shows a synchronization signal generated by the control unit 38 in accordance with the start timing of the W segment of the color wheel 51.
- the synchronization signal at the timing of starting the B period in the supply of alternating current is SY1
- the synchronization signal at the timing of starting the C period is SY2
- the A period is A synchronization signal at the start timing is indicated by SY3.
- the high pressure discharge lamp lighting device 3 performs a polarity reversal operation for starting the B period in response to the synchronization signal SY1 shown in FIG.
- the current increase / decrease operation according to the program is performed.
- the length of the B period is 0.5 cycles, there is no polarity reversal operation during this period.
- the light transmission time in each segment determined by the rotation speed of the color wheel 51 and the rotation angle of each segment is programmed in advance, and the current increase / decrease timing is set to coincide with the switching timing of each segment.
- the high-pressure discharge lamp lighting device 3 starts the C period in response to the synchronization signal SY2.
- the high pressure discharge lamp lighting device 3 starts the period B again in response to the synchronization signal SY1, and sequentially repeats the above operations.
- the A period is started in response to the synchronization signal SY3.
- the high-pressure discharge lamp lighting device 3 starts the C period again in response to the synchronization signal SY2, and repeats the B period and the C period as described above. Further, after repeating the B period and the C period a predetermined number of times determined by the program, the A period is started. Thereafter, these series of operations are repeated.
- the configuration in which the synchronization signal is generated by the control unit 38 in accordance with the start of the W segment is shown.
- the configuration may be generated in accordance with the start of the segment. In this case, the same operation as described above can be realized by reconfiguring the program of the microcomputer 11 in the high pressure discharge lamp lighting device 3.
- current increase / decrease and polarity inversion are performed as a series of operations according to the contents programmed in advance without depending on the synchronization signal during the A period, the B period, and the C period.
- the current increase / decrease and polarity reversal operations may be started in response to each synchronization signal.
- the same operation as described above can be realized by reconfiguring the program of the microcomputer 11.
- the waveform example shown in FIG. 15 the waveform example shown in FIGS. 13 and 14, or the waveform of the alternating current of the current increase / decrease operation and polarity inversion operation different from those shown in FIG. By doing so, it is possible to realize a target waveform.
- FIG. 18 shows a synchronization signal generated by the control unit 38 in accordance with the start timing of each segment of the color wheel 51.
- the synchronization signal at the timing for starting the B period in the supply of alternating current is SY4
- the synchronization signal at the timing for starting the C period is SY5
- the A period is A synchronization signal at the start timing is indicated by SY6.
- the high pressure discharge lamp lighting device 3 performs current increase / decrease and polarity reversal operations predetermined by the program of the internal microcomputer 11 in response to all the synchronization signals shown in FIG.
- the high pressure discharge lamp lighting device 3 performs the current increase / decrease and polarity inversion operations determined in advance by the program of the internal microcomputer 11 in response to all the synchronization signals.
- the high pressure discharge lamp lighting device 3 may not react to a part of the synchronization signal.
- the light transmission time in each segment determined by the rotation speed of the color wheel 51 and the rotation angle of each segment is programmed in advance, so that the current increase / decrease in AC current and
- the polarity inversion operation timing and the switching timing of each segment of the color wheel 51 can be set to coincide with each other.
- the first synchronization method for generating the synchronization signal for each rotation of the color wheel and the second synchronization method for generating the synchronization signal for each switching of the segments of the color wheel. These two methods are shown.
- the configuration of the color wheel, the method for increasing or decreasing the current for each segment, and the waveform of the alternating current are not limited to the above configuration.
- the first advantage is that the first synchronization method only needs to generate a synchronization signal for each rotation of the color wheel, and the second synchronization method generates a synchronization signal in accordance with the switching of each segment of the color wheel. Compared to, the configuration is simple, so the number of parts used is small and the manufacturing cost is low.
- the second advantage is to reduce the color braking phenomenon peculiar to the single-plate DLP type in recent years (a phenomenon in which a rainbow-like noise can be seen on the screen due to a structure in which each color is switched in time series). Furthermore, this is for the tendency that the rotation speed of the color wheel is increased and the generation interval of the synchronization signal is narrowed.
- the synchronization signal transmission circuit in the control unit and the synchronization signal reception circuit in the high pressure discharge lamp lighting device have a simple configuration to increase the signal transmission / reception accuracy.
- the one synchronization method has an advantage that it can be realized easily and at low cost.
- the number of colors used in the color wheel is increased to improve color reproducibility, and as a result, the number of segments tends to increase.
- the first synchronization method that does not depend on the number of color wheel segments is more suitable. Compared with the second synchronization method, it is easier to manufacture and costs less.
- the third advantage is that if the synchronization signal transmission / reception circuit becomes complicated, the probability of malfunction caused by deterioration, abnormality, or disturbance of parts increases, so the polarity of AC current in the high pressure discharge lamp lighting device is reversed. Although the probability of causing an abnormality in the operation and the current increase / decrease operation increases, the first synchronization method suppresses the occurrence of the current increase / decrease operation abnormality because the configuration of the transmission / reception circuit is simpler than the second synchronization method. Be able to. ⁇ Rear projector>
- the high-pressure discharge lamp device 1 according to the first and second embodiments can also be used as a light source of a rear projector 42 which is an example of a projection type image display device shown in FIG.
- the rear projector 42 has a configuration in which a lamp unit 27, an optical unit, a projection lens, a mirror, a high-pressure discharge lamp lighting device (all not shown), and the like are housed in a housing 43.
- the image projected from the projection lens and reflected by the mirror is projected from the back side of the transmissive screen 44 and displayed as an image.
- the high-pressure discharge lamp lighting device As described above, the high-pressure discharge lamp lighting device according to the present invention, the high-pressure discharge lamp device using the same, the projector using the high-pressure discharge lamp device, and the lighting method of the high-pressure discharge lamp have been described based on the embodiments.
- the invention is not limited to these embodiments.
- the following modifications can be considered.
- a configuration is shown in which the frequency of the alternating current is alternately switched between two values by alternately repeating the B period and the C period during the predetermined time E.
- a fourth value or a fifth value may be added to alternately switch between three or more values.
- the length of the C period may be an odd multiple of 0.5 period.
- the period of supplying the alternating current of the fourth period and the alternating current of the fifth value can be adjusted to each other.
- a configuration is shown in which control is performed so that C periods are provided before and after each A period.
- the present invention is not limited to this, and at least one of the periods before and after each A period is set as the B period. It is good also as a structure controlled to.
- the rated power is, for example, 80 [W] or more and 1000 [W]. Even when a high-pressure mercury lamp within the following range is used, the same effect as described above can be obtained.
- the value of the lamp current at the time of constant current control is not limited to 3 [A], and is variously determined according to the design of the high-pressure mercury lamp.
- the lamp voltage at the time of shifting to the constant power control is not 60 [V] as described above, but is determined according to the values of the lamp current and the constant power during the various constant current controls.
- the high-pressure mercury lamp 4 is specifically used as the high-pressure discharge lamp.
- the present invention is not limited to this, and the same applies to the case where a known shoot arc type metal halide lamp is used. The effect of this can be obtained.
- some high-pressure discharge lamp devices 1 of this type are provided with a dimming function that switches the lamp power stepwise in accordance with the size of the space to be used. That is, in the normal mode, the constant power control is performed with the lamp power constant at a rated power (for example, 180 [W]), but in the dimming mode, the constant power control is performed by switching the lamp power to be constant at, for example, 100 [W]. Is to do.
- the high-pressure discharge lamp device 1 has a dimming function as described above, when the above-described “constant power” is set to the normal mode, the constant power of the normal mode is set to the dimming mode. When set, the constant power of the dimming mode is shown.
- the present invention can be widely used for projectors and the like.
Landscapes
- Circuit Arrangements For Discharge Lamps (AREA)
Abstract
Description
2 DC電源回路
3 高圧放電ランプ点灯装置
4 高圧水銀ランプ
5 DC/DCコンバータ
6 DC/ACインバータ
7 高電圧発生部
8 ランプ電流検出部
9 ランプ電圧検出部
10 制御回路
11 マイコン
12 PWM制御回路
13 点灯判別回路
14 タイマー
16 発光部
18 放電空間
19 電極
20 電極棒
21 電極コイル
22 先端部
23 突起部
26 反射鏡
27 ランプユニット
28 反射面
35 フロントプロジェクタ
42 リアプロジェクタ
50 カラーホイール
50a 境界線
51 カラーホイール
55 フロントプロジェクタ
56 光学ユニット
57,58 レンズ
59 DMDパネル
65 ミラー群
66 液晶パネル
70 プリズム
E 所定時間(所定の時間間隔)
L 電極間距離
(第1の実施形態)
<構成>
図1は、本発明の第1の実施形態である高圧放電ランプ装置1のブロック図を示す。
<動作>
次に、本実施形態に係る高圧放電ランプ点灯装置3の動作例について図1、図2および図5のフローチャートを参照して説明する。図5は、高圧放電ランプ点灯装置3における交流電流の変調制御を示すフローチャートである。ただし、図5のフローチャートにおいて後述する始動動作は省略している。
(1)まず、高圧水銀ランプ4を放電開始させるための点灯スイッチ(図示せず)がオンされると、制御回路10は、高電圧発生部7に例えば3[kV]、100[kHz]の高周波の高電圧を発生させる。発生された高周波の高電圧は高圧水銀ランプ4に印加される。
(2)高圧水銀ランプ4における電極19間において絶縁破壊が起こると電極19間に高周波のアーク放電電流が通電し始める。すなわち、高圧水銀ランプ4は放電を開始する。放電開始後も一定期間、高周波の電圧が高圧水銀ランプ4に印加され続ける。
(3)始動動作後、略矩形波の交流電流による定電流制御(例えば3[A]一定)の点灯に移行する。
(4)制御回路10は、水銀の蒸発に伴ってランプ電圧が上昇して所定の電圧(例えば60[V])に到達するまで定電流制御で高圧水銀ランプ4を点灯させる。その一方で、制御回路10は、ランプ電流検出部8の出力信号に基づき点灯開始したか否かを判別する。そして、図5に示すように点灯開始すれば、制御回路10は、タイマー14のカウントを開始させ(S11)、DC/ACインバータ6に制御信号dを入力する(S12)。制御信号dは、高圧水銀ランプ4に供給する交流電流の周波数を、所定の値、例えば135[Hz]に特定するための信号である。DC/ACインバータ6は、制御信号dから周波数を特定し、交流電流の極性反転動作を実行する。
(5)タイマー14の設定時間は、60[秒]以上300[秒]以下の範囲内から選択されており、本実施形態では100[秒]が選択されている。制御回路10は、点灯開始から100[秒]を経過するまで、DC/ACインバータ6への制御信号dの入力を維持する(S13:NO)。点灯開始から100[秒]を経過すれば、高圧水銀ランプ4が定常点灯状態にあり、制御回路10は、略矩形波の交流電流の変調制御を実行する(S13:YES)。
(6)制御回路10は、点灯開始から100[秒]を経過すれば、所定時間E(所定の時間間隔)の計測を開始する(S14)。
(7)次に、制御回路10は、DC/ACインバータ6に制御信号bを入力する(S15)。制御信号bは、B期間における交流電流の周波数を第1の値に特定するための信号である。これにより、制御信号bにより特定される第1の値の交流電流がDC/ACインバータ6から出力され、高圧水銀ランプ4に供給される。
(8)制御回路10は、B期間が経過するまでDC/ACインバータ6への制御信号bの入力を維持し(S16:NO)、B期間を経過すれば(S16:YES)、制御信号bから制御信号cに切り替える(S17)。制御信号cは、C期間における交流電流の周波数を第2の値に特定するための信号である。これにより制御信号cにより特定される第2の値の交流電流がDC/ACインバータ6から出力され、高圧水銀ランプ4に供給される。
(9)制御回路10は、C期間が経過するまでDC/ACインバータ6への制御信号cの入力を維持し(S18:NO)、C期間が経過すれば(S18:YES)、所定時間Eの経過を確認する(S19)。
(10)このとき、所定時間Eが経過していない場合(S19:NO)、制御回路10は、制御信号cから制御信号bに切り替え(S15)、前記(7)に戻って、S15以降の動作を続ける。
(11)所定時間Eが経過している場合(S19:YES)、所定時間Eの計測をリセットし(S20)、制御回路10は、制御信号cから制御信号aに切り替える(S21)。制御信号aは、A期間における交流電流の周波数を第3の値に特定するための信号である。これにより制御信号aにより特定される第3の値の交流電流がDC/ACインバータ6から出力され、高圧水銀ランプ4に供給される。
(12)制御回路10は、A期間が経過するまでDC/ACインバータ6への制御信号aの入力を維持し(S22:NO)、A期間が経過すれば(S22:YES)、制御回路10は、制御信号aから制御信号cに切り替える(S23)。これにより制御信号cにより特定される第2の値の交流電流がDC/ACインバータ6から出力され、高圧水銀ランプ4に供給される。
(13)制御回路10は、C期間が経過するまでDC/ACインバータ6への制御信号cの入力を維持し(S24:NO)、C期間が経過すれば(S24:YES)、制御信号cから制御信号bに切り替え(S15)、前記(7)に戻って、S15以降の動作を続ける。
(14)制御回路10は、以降、点灯スイッチがオフされるまで、S15~S24の一連のステップを繰り返す。
<交流電流の波形例>
図6には、上記動作により得られる定常点灯状態における略矩形波の交流電流の波形の一例が示されている。
<試験結果>
図8は、点灯試験における電圧推移の結果を示す表であり、本実施形態に係る高圧放電ランプ装置1と、当該高圧放電ランプ装置1とはA期間の長さを示す設定周期が異なる3つの高圧放電ランプ装置との試験結果を示している。なお、当該試験に用いた各高圧放電ランプ装置において、共通する構成要素については、簡単のため同一の符号を用いて説明する。
<各周波数の値、各期間および所定時間Eの設定範囲>
次に、第1~第3の値、A~C期間および所定時間Eにおける設定範囲について説明する。
<プロジェクタ>
次に、高圧放電ランプ装置1を用いたプロジェクタについて説明する。
(第2の実施形態)
プロジェクタの画像表示方式には、上記した、3原色R,G,Bに対応した3枚の画像表示デバイスを用いて3原色の画像を同時合成して投射する方式と、1枚のみの画像表示デバイスを用いて原色となる各色の画像を時系列に投射する方式とがある。
<構成>
図11に、単板DLP方式のフロントプロジェクタの具体的な構成例を示す。
<動作>
フロントプロジェクタ55は、ランプユニット27からの光を、レンズ57を介して高速で回転するカラーホイール50を透過させることによって、R,G,B,Wの4色の光を時分割で、DMDパネル59に照射させることができる。また、DMDパネル59は各色に対応したそれぞれの映像信号に従って内蔵のマイクロミラーが反射するよう制御ユニット38によって制御されている。そして、DMDパネル59で反射されたR、G、B、Wの4色の画像の光が、投射レンズ39を介してスクリーン(図示せず)に表示される。各色の画像は時系列に高速で切り替わるため、人間の目には、混合された色としてかつ目的とする投射画像として感知される。
<交流電流の波形例>
《波形例1》
図13に、各色のセグメントが均等な角度で分割配置されたカラーホイール50を用いた構成において本発明を適用した交流電流の波形例を示す。カラーホイール50におけるB,G,R,Wの各セグメントの角度は全て90度である(図12(a)参照)。このカラーホイール50はビデオ入力信号周波数の3倍の180[Hz]に対応した回転数10800[r.p.m]で回転しており、光源に第1の実施形態と同じ定格電力180[W]の高圧水銀ランプ4を用いている。第1~第3の値、A~C期間および所定時間Eは次のように設定されている。
《波形例2》
投射画像の色再現性を高めるものとして、4色のセグメントの角度を不均等に配置したカラーホイールを用いた構成が知られている。図12(b)に、Rセグメントの角度を大きくし、Wセグメントの角度を小さくしたカラーホイール51を示す。このカラーホイール51を用いた場合には、カラーホイール51を透過して得られる各色の光のうち、R色の光の発生時間が最も長く、W色の光の発生時間が最も短い。このようにR色の光の発生時間を長くして、ランプユニット27から出た光において本来含有比率の少ないR色の利用比率が増加することで投射画像の色再現性を高めることができる。
《波形例3》
また、投射画像の色再現性をさらに高めるものとして、上記と同じく4色のセグメントの回転角度を不均等に配置したカラーホイールを用いることに加えて、色のセグメント毎に透過するランプの光量を変化させる方法が知られている。例えば、Rセグメントを通る光量を増加しWセグメントを通る光量を減少させるようにランプユニット27の出射光量を制御することで、R色の利用比率がさらに増加するので投射画像の色再現性をさらに高めることができる。ランプユニット27の出射光量の制御は、高圧放電ランプ点灯装置3において、その内部のマイコン11が電流の増減の制御を行うことで実現することができる。
《波形例4》
図15に示す波形例では、Rセグメントの電流増加が、あるC期間では、一対の電極19のうち一方の電極のみに偏り、次のC期間では他方の電極19のみに偏っている。C期間が何度も繰り返されるような時間間隔で見た場合には、一対の電極19における電流増加は、両電極に交互に印加されることになるので、各電極19における突起部23の成長および減退のバランスが取られている。しかしながら、C期間を長く設定した場合には、電流増加が一方の電極に印加される期間が長くなるので、当該C期間の間に、電極の突起部23における成長および減退のバランスが崩れる場合がある。
<同期方式の具体例>
次に、制御ユニット38から送出される同期信号と、その同期信号に反応して高圧放電ランプ点灯装置3が交流電流の極性反転動作をおこなう同期方式の具体例について説明する。この同期方式として、カラーホイールの1回転毎に同期信号を発生させる第1の同期方式と、カラーホイールの各色セグメントの切り替わり毎に同期信号を発生させる第2の同期方式とがある。以下の具体例では、各セグメントの回転角度が不均等なカラーホイール51、およびセグメント毎に電流増減をする方法を組み合わせた構成を有するプロジェクタを用いている。また、第1~第3の値、A~C期間、ならびに所定時間Eは、図15に示す交流電流の波形例と同じ設定のものを用いている。
《第1の同期方式》
まず、第1の同期方式について、図17を用いて説明する。図17には、制御ユニット38により、カラーホイール51のWセグメントの開始のタイミングにあわせて発生された同期信号が示されている。また、説明し易くするため、図17において、同期信号のうち、交流電流の供給におけるB期間を開始するタイミングの同期信号をSY1、C期間を開始するタイミングの同期信号をSY2、およびA期間を開始するタイミングの同期信号をSY3で示している。
《第2の同期方式》
次に、第2の同期方式について説明する。図18には、制御ユニット38により、カラーホイール51の各セグメントの開始のタイミングにあわせて発生された同期信号が示されている。また、図18において、図17と同様に、同期信号のうち、交流電流の供給におけるB期間を開始するタイミングの同期信号をSY4、C期間を開始するタイミングの同期信号をSY5、およびA期間を開始するタイミングの同期信号をSY6で示している。
<リアプロジェクタ>
上記第1および第2の実施形態である高圧放電ランプ装置1は、図19に示す投射型画像表示装置の一例であるリアプロジェクタ42の光源としても用いることができる。リアプロジェクタ42は、ランプユニット27、光学ユニット、投射レンズ、ミラーおよび高圧放電ランプ点灯装置(いずれも図示せず)等が筐体43内に収納された構成を有している。投射レンズから投射されミラーで反射された画像が、透過式スクリーン44の裏側から投影されて画像表示される。
例えば、以下のような変形例が考えられる。
<変形例>
(1)上記実施形態では、所定時間Eの間において、B期間とC期間とを交互に繰り返して、交流電流の周波数を2つの値に交互に切り替える構成が示されているが、当該周波数の交互の切り替えを、例えば第4の値や第5の値などを加えて、3つ以上の値で交互に切り替える構成としてもよい。もっとも、この場合には、C期間の長さが0.5周期の奇数倍であってもよい。B期間における交流電流の位相が、その前のB期間における交流電流の位相に対して逆位相となる限り、C期間、第4の値の交流電流を供給する期間および第5の値の交流電流を供給する期間における各期間の長さ(各期間の長さとなる周期の設定)を互いに調整することができる。
(2)上記実施形態では、各A期間の前後にC期間を設けるように制御する構成が示されているが、これに限らず、各A期間の前後のうち少なくとも一方をB期間とするように制御する構成としても良い。
(3)上記各実施形態では、高圧水銀ランプとして定格電力180[W]の高圧水銀ランプ4を用いた場合について説明したが、これに限らず定格電力が例えば80[W]以上1000[W]以下の範囲内の高圧水銀ランプを用いた場合でも上記と同様の作用効果を得ることができる。その場合、定電流制御時のランプ電流の値は3[A]に限定されるものではなく、高圧水銀ランプの設計の応じて種々に決定される。また定電力制御に移行するときのランプ電圧は上記したように60[V]ではなく、その種々の定電流制御時のランプ電流と定電力の値に応じて決定される。
(4)上記各実施形態では、高圧放電ランプとして具体的に高圧水銀ランプ4を用いた場合について説明したが、これに限らず公知のシュートアーク型のメタルハライドランプ等を用いた場合でも上記と同様の作用効果を得ることができる。
(5)近時、この種の高圧放電ランプ装置1には、使用する空間の大きさ等に応じて段階的にランプ電力を切り替える調光機能が付与されているものがある。つまり、通常モードではランプ電力を定格電力(例えば180[W])に一定にして定電力制御を行うが、調光モードではランプ電力を切り替えて例えば100[W]に一定にして定電力制御を行うというものである。各実施形態にかかる高圧放電ランプ装置1がこのように調光機能を有する場合、上記した「定電力」とは通常モードに設定されているときはその通常モードの定電力を、調光モードに設定されているときはその調光モードの定電力をそれぞれ示す。
Claims (17)
- 内部に、ハロゲン物質が封入され、かつ先端部に突起部が形成されてなる一対の電極が対向配置されている発光管を有する高圧放電ランプに対して交流電流を供給して点灯させる高圧放電ランプ点灯装置であって、
前記高圧放電ランプに供給する交流電流の周波数を、第1の値と、この第1の値より高い第2の値と、前記第1の値以下の第3の値とに切り替える周波数切替回路と、この周波数切替回路を制御する制御回路とを備え、
前記制御回路は、
前記第3の値の交流電流を供給するA期間を、所定の時間間隔で繰り返すとともに、
前記所定の時間間隔の間に、前記第1の値の交流電流を供給するB期間と、前記第2の値の交流電流を供給するC期間とを交互に繰り返し、
前記A期間の長さを、前記B期間よりも長く、かつ前記第3の値の交流電流の5.5周期以上50周期以下の所定の周期とするように、前記周波数切替回路を制御する
ことを特徴とする高圧放電ランプ点灯装置。 - 前記制御回路は、前記所定の時間間隔の間において、
前記A期間の後を前記C期間とし、その後、前記B期間と、前記C期間とを交互に繰り返し、最後を前記C期間とするように、前記周波数切替回路を制御する
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記第1の値が、20[Hz]以上200[Hz]以下の範囲である
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記B期間の長さが、前記第1の値の交流電流の0.5周期以上10周期以下の所定の周期である
ことを特徴とする請求項3に記載の高圧放電ランプ点灯装置。 - 前記第2の値が、300[Hz]以上1000[Hz]以下の範囲である
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記第2の値が、210[Hz]以上1000[Hz]以下の範囲から選択される複数の0.5周期の周波数の平均値であり、かつその平均値が、300[Hz]以上1000[Hz]以下の範囲である請求項1に記載の高圧放電ランプ点灯装置。
- 前記C期間の長さが、前記第2の値の交流電流の2周期以上200周期以下の所定の周期である
ことを特徴とする請求項5に記載の高圧放電ランプ点灯装置。 - 前記第3の値が、15[Hz]以上150[Hz]以下の範囲である
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記A期間を繰り返す前記所定の時間間隔が、1[秒]以上300[秒]以下の範囲である
ことを特徴とする請求項8に記載の高圧放電ランプ点灯装置。 - 前記制御回路が、前記所定の時間間隔の間に前記B期間を複数回繰り返すとともに、この複数の前記B期間における交流電流の位相を、前記B期間が現れる順に交互に逆位相となるように、前記周波数切替回路を制御する
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 前記制御回路が、前記A期間における交流電流の位相を、前記A期間が現れる順に交互に逆位相となるように、前記周波数切替回路を制御する
ことを特徴とする請求項1に記載の高圧放電ランプ点灯装置。 - 内部に、ハロゲン物質が封入され、かつ先端部に突起部が形成されてなる一対の電極が対向配置されている発光管を有する高圧放電ランプと、
この高圧放電ランプを点灯させる請求項1に記載された高圧放電ランプ点灯装置と、
を備えたことを特徴とする高圧放電ランプ装置。 - 請求項12に記載された高圧放電ランプ装置を備えたことを特徴とするプロジェクタ。
- 内部に、ハロゲン物質が封入され、かつ先端部に突起部が形成されてなる一対の電極が対向配置されている発光管を有する高圧放電ランプに対して交流電流を供給して点灯させる高圧放電ランプの点灯方法であって、
前記交流電流の周波数を、第1の値と、この第1の値より高い第2の値と、前記第1の値以下の第3の値とに切り替えるに際し、
前記周波数を、前記第3の値に所定の時間間隔で切り替えて、前記第3の値の交流電流を供給するA期間を前記所定の時間間隔で繰り返すとともに、
前記所定の時間間隔の間に、前記第1の値と、前記第2の値とを交互に切り替えて、前記第1の値の交流電流を供給するB期間と、前記第2の値の交流電流を供給するC期間とを交互に繰り返し、
前記A期間の長さを、前記B期間よりも長く、かつ前記第3の値の交流電流の5.5周期以上50周期以下の所定の周期とする
ことを特徴とする高圧放電ランプの点灯方法。 - 前記所定の時間間隔の間において、
前記A期間の後を前記C期間とし、その後、前記B期間と、前記C期間とを交互に繰り返し、最後を前記C期間とする
ことを特徴とする請求項14に記載の高圧放電ランプの点灯方法。 - 前記所定の時間間隔の間において、前記B期間を複数回繰り返し、さらにこの複数の前記B期間における交流電流の位相を、前記B期間が現れる順に交互に逆位相とする
ことを特徴とする請求項14に記載の高圧放電ランプの点灯方法。 - 前記A期間における交流電流の位相を、前記A期間が現れる順に交互に逆位相とする
ことを特徴とする請求項14に記載の高圧放電ランプの点灯方法。
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JP2009554810A JP5313932B2 (ja) | 2008-09-29 | 2009-03-27 | 高圧放電ランプ点灯装置、それを用いた高圧放電ランプ装置、その高圧放電ランプ装置を用いたプロジェクタ、および高圧放電ランプの点灯方法 |
CN200980100378.6A CN101828430B (zh) | 2008-09-29 | 2009-03-27 | 高压放电灯点亮装置、使用了该高压放电灯点亮装置的高压放电灯装置、使用了该高压放电灯装置的投影仪、以及高压放电灯的点亮方法 |
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