CN101730354A

CN101730354A - High pressure discharge lamp lighting device and image display device

Info

Publication number: CN101730354A
Application number: CN200910205391A
Authority: CN
Inventors: 渡边浩士; 中野智之; 长谷川纯一; 中田克佳
Original assignee: Matsushita Electric Works Ltd
Current assignee: Panasonic Electric Works Co Ltd
Priority date: 2008-10-21
Filing date: 2009-10-21
Publication date: 2010-06-09
Anticipated expiration: 2029-10-21
Also published as: CN101730354B; EP2180767A2; JP2010123567A; EP2180767B1; EP2180767A3

Abstract

The invention provides a high pressure discharge lamp lighting device which can reduce flickering of a high-pressure discharge lamp with a relatively simple control. Upon start of lighting of a high-pressure discharge lamp, after the high-pressure discharge lamp reaches a substantially stable state or reaches a predetermined lamp voltage, the high-pressure discharge lamp is lighted in at least three lighting modes with a predetermined average power put into the high-pressure discharge lamp, and in the lighting modes, a period of a positive polarity is nearly equal to a period of a negative polarity in a first mode, a period of a positive polarity is longer than a period of a negative polarity in a second mode, and a period of a positive polarity is shorter than a period of a negative polarity in a third mode. Lighting frequencies in the second mode and the third mode are equal to or less than a lighting frequency in the first mode, each of periods t1, t2, t3 in the modes is at least one cycle, at least one first mode, and at least one second mode and at least one third mode are collectively defined as one set and the one set is repeated.

Description

High-pressure discharge lamp operation device and use its image display device

Technical field

The present invention relates to make high-pressure discharge lamp operation device that the high brightness high-pressure discharge lamp (HID lamp) of high-pressure mercury-vapor lamp or metal halide lamp etc. lights a lamp and the image display device that uses it.

Background technology

In recent years, use the projector of the projection pattern of liquid-crystal apparatus, or use is put down-the 10-501919 communique as Japanese Unexamined Patent Application Publication as the flicker (flicker) of DLP (Texas Instrument's registered trade mark) projector in order to reduce lamp of the projection pattern of the DMD (Texas Instrument (Texas Instruments) registered trade mark) of reflection-type image display device, TOHKEMY 2001-244088 communique is like that by making pulse current be superimposed upon method on the lamp current, or as TOHKEMY 2004-281381 communique by triangular wave being superimposed upon the flicker (flicker) that the method that makes lamp current waveform distortion on the lamp current has reduced lamp.

In addition, in the projector of the projection pattern that uses liquid-crystal apparatus,, liquid-crystal apparatus is changed for normal black (Normally black) mode from normal white (normally white) mode in order to improve contrast.Here, so-called normal white mode is to become the black mode that shows by applying voltage, and so-called normal black formula is to become the mode of white demonstration by applying voltage.

Recently, begin to take place undesirable condition along the horizontal generation informal voucher (horizontal bright line) of projected picture.Its reason is not also separated bright in detail, it is said because take place by connecting to the transistor of the light leak of the driver of liquid-crystal apparatus, driver.Make pulse current be superimposed upon the method on the lamp current or triangular waveform is superimposed upon method on the lamp current if adopt, then can input ratio big lamp current usually, so light output moment property ground increases, become the state of easy generation light leak, consider above-mentioned undesirable condition takes place, the become liquid crystal projector of the projection pattern that is not suitable for using liquid-crystal apparatus of the above-mentioned mode of lighting a lamp.

Therefore, at least in the projector of the projection pattern that uses liquid-crystal apparatus, for the flicker (flicker) that reduces high-pressure discharge lamp, the method beyond need being superimposed upon pulse current etc. on the lamp current.As this method, proposed as patent documentation 1 (TOHKEMY 2006-59790 communique) in some modulation frequency usually, to insert low-frequency method of specified time limit and as patent documentation 2 (TOHKEMY 2008-177002 communique), be made as the light a lamp method of pattern (lamp being lit a lamp) of reproduction during input with the some modulation frequency that is lower than common some modulation frequency at reproducing signal.

Below carry out detailed slightly explanation, the flicker of high-pressure discharge lamp (flicker) is because if use high-pressure discharge lamp between long-term, then electrode shape becomes mixed and disorderly state along with the life-span process, generate a plurality of projections, and when the polarity inversion of the electric current that drops into to high-pressure discharge lamp, the bright spot of electric arc moves aperiodically between a plurality of projections that generate and takes place.In order to tackle in this, in common some modulation frequency, selection is used for forming the frequency of the projection of electrode front end, make high voltage discharge lamp lighting, and make high voltage discharge lamp lighting with the frequency that is lower than common some modulation frequency termly, the point modulation frequency that the surface temperature that this low frequency is selected to make electrode rises, will unnecessary projection fusion is not so that a plurality of projections of generation can produce around the projection that generates in the initial stage of electrode front end.

[patent documentation 1] TOHKEMY 2006-59790 communique

[patent documentation 2] TOHKEMY 2008-177002 communique

The flat 10-501919 communique of [patent documentation 3] Japanese Unexamined Patent Application Publication

[patent documentation 4] TOHKEMY 2001-244088 communique

[patent documentation 5] TOHKEMY 2004-281381 communique

If as patent documentation 1 and patent documentation 2, insert than the common low frequency of some modulation frequency, then during the low spot modulation frequency, and to compare during the common some modulation frequency, the light output of time per unit is risen.This be because, when the polarity inversion of the electric current that drops into to the high-voltage discharge lamp, zero friendship makes polarity inversion owing to electric current has on the bias, so light output descends between the transfer period of this polarity, the light of time per unit is exported corresponding to the frequency of polarity inversion and changed.Thus, the flicker that variation that might the origination point modulation frequency brings.In addition, at the polarity chron of switch current, the power (electric power) that drops into to high-pressure discharge lamp also descends, so average power content changes according to the number of times of polarity inversion.Amplitude of variation at average power content becomes under the situation of problem, need carry out the design of power controlled quentity controlled variable, so that average power is roughly the same when common some modulation frequency and during low frequency.

In addition, inserting under the situation of lighting a lamp,, also can enumerate following problem as other problem even allowing light output and average power changes than putting the low frequency of modulation frequency usually.

As shown in Figure 3, light a lamp general the constituting of ignition device of high-pressure discharge lamp of mode of interchange by buck circuit 11 and polarity inversion circuit 12 (full-bridge circuit), the structure of polarity inversion circuit 12 uses the switch element Q2～Q5 that is made of MOS-FET etc. to constitute full-bridge circuit as shown in Figure 3, and the drive circuit 12a that is used for carrying out its driving is the such structure of Fig. 4 (a).Driver IC 12a1 uses the IR2111S of IR company etc., and shown in Fig. 4 (b), by the H/L of full-bridge control signal FB1 ', hot side switch element Q2, low potential side switch element Q3 carry out on/off (ON/OFF), disconnection/connection.The driving power of drive circuit 12a is directly supplied with from control power supply Vcc for low potential side switch element Q3, for hot side switch element Q2, by via diode D2 to capacitor C3 charging charge and supply power.Condition to capacitor C3 charging charge is that hot side switch element Q2 disconnects (OFF), low potential side switch element Q3 connects (ON), otherwise, is under the situation about disconnecting at hot side switch element Q2 for connection, low potential side switch element Q3, the electric charge of charging in capacitor C3 is released, voltage decline (with reference to the dotted line of Fig. 5 (c)).Drive circuit 12b for switch element Q4, Q5 side also is same.

In the method for the low some modulation frequency of the common some modulation frequency of the ratio that as patent documentation 1 and patent documentation 2, inserts specified time limit, must be corresponding to the capacitance that decides than common the low some modulation frequency of modulation frequency as the capacitor C3 of the driving power of the hot side switch element of drive circuit, need the capacitance ratio with the big capacitor of the situation of the common Frequency Design of lighting a lamp, so become the reason that cost raises.In addition, though capacitance balance with capacitor C3, but in the lamp current of the conventional example shown in Fig. 5 (a), the lower limit that is lower than the frequency of common some modulation frequency can only be set at shown in the dotted line of Fig. 5 (c), can guarantee to diminish so set the degree of freedom of the lower limit (the time tmax among the figure) of lower frequency more than the threshold voltage vt h that the switch element Q2 of hot side can connect as the voltage of capacitor C3.

Summary of the invention

The purpose of this invention is to provide a kind of at least in the projector of the projection pattern that uses liquid-crystal apparatus, except pulse current being superimposed upon the mode on the lamp current, be subjected to the situation of design factor constraint of circuit less, corresponding to the design freedom height of each lamp, can be by fairly simple control reduction high-pressure discharge lamp the high-voltage discharging lamp device of flicker (flicker).

The invention of technical scheme 1 as shown in Figure 3, is a kind of discharge lamp ignition device in order to address the above problem, and it is characterized in that possessing: power supply unit 11, high-pressure discharge lamp La is supplied with the power of stipulating; Make the unit 12 of the alternating polarity counter-rotating of the electric current that high-pressure discharge lamp La is supplied with; And control unit 14, can change the frequency and the duty ratio that make this alternating polarity counter-rotating, this duty ratio be its positive polarity during with negative polarity during ratio, after high-pressure discharge lamp La begins to light a lamp, after high-pressure discharge lamp La roughly reaches stable state or after reaching the modulating voltage of regulation, under the average power of the regulation that drops into to high-pressure discharge lamp La, high-pressure discharge lamp La is lit a lamp with at least 3 patterns of lighting a lamp; In the above-mentioned pattern of lighting a lamp, during the positive polarity of the 1st pattern with negative polarity during about equally, during the positive polarity of the 2nd pattern than long during the negative polarity, during the positive polarity of the 3rd pattern than short during the negative polarity; T1, t2, t3 are more than at least 1 cycle during each pattern, with the 1st pattern, the 2nd pattern, the 3rd pattern at least each 1 pattern carry out this 1 group repeatedly as 1 group.

The invention of technical scheme 2 is characterised in that, in the invention of technical scheme 1, as shown in Figure 1, the frequency f 2 of lighting a lamp of the 2nd pattern and the 3rd pattern, f3 be the 1st pattern light a lamp frequency f below 1.

The invention of technical scheme 3 is characterised in that, in the invention of technical scheme 1, as shown in Figure 2, the some modulation frequency height of frequency ratio the 1st pattern of lighting a lamp at least one pattern of the 2nd pattern and the 3rd pattern.

The invention of technical scheme 4 is characterised in that, in the invention of technical scheme 1～3, as shown in figure 11, is changing under the situation of the power that high-pressure discharge lamp drops into variation point modulation frequency at least 1 pattern in each pattern.

The invention of technical scheme 5 is characterised in that, in the invention of technical scheme 1～3, as shown in figure 12, under the situation of the power that high-pressure discharge lamp drops into, changes duty ratio at least 1 pattern in the 2nd pattern or the 3rd pattern in change.

The invention of technical scheme 6 is characterised in that, in the invention of technical scheme 1～3, as shown in figure 13, in change under the situation of the power that high-pressure discharge lamp drops into, at least 1 pattern in each pattern this pattern of change during.

The invention of technical scheme 7 is characterised in that, in the invention of technical scheme 1～3, as shown in figure 14, changing under the situation of the power that high-pressure discharge lamp drops into, some modulation frequency in each pattern, duty ratio, during project in change two projects at least, the project of change be under the situation of a modulation frequency in the 1st pattern～the 3rd pattern, be each value of change at least 1 pattern in the 1st pattern～the 3rd pattern under the situation in the 2nd pattern or the 3rd pattern, during being under the situation of duty ratio.

The invention of technical scheme 8 is characterised in that, in the invention of technical scheme 1～3, as shown in figure 15, modulating voltage according to high-pressure discharge lamp, some modulation frequency in each pattern, duty ratio, during project in change 1 project at least, the project of change be under the situation of a modulation frequency in the 1st pattern～the 3rd pattern, be each value of change at least 1 pattern in the 1st pattern～the 3rd pattern under the situation in the 2nd pattern or the 3rd pattern, during being under the situation of duty ratio.

The invention of technical scheme 9 as shown in figure 16, is characterized in that in the invention of technical scheme 1～3, make the 2nd pattern and the 3rd pattern duty ratio and be not equal to 100%, with and/or make during the 2nd pattern and the 3rd pattern different.

The invention of technical scheme 10 is to possess each described high-pressure discharge lamp operation device (Figure 18) in the technical scheme 1～3.

The invention effect

According to the invention of technical scheme 1, the degree of freedom of setting that is inserted into the some modulation frequency of the 2nd pattern in the common some modulation frequency or the 3rd pattern increases, and the power supply of drive circuit is guaranteed to become easily, can realize the miniaturization and the cost degradation of circuit thus.In addition, the amplitude of variation of light output and power is diminished, have the effect of the flicker (flicker) that reduces high-pressure discharge lamp.

According to the invention of technical scheme 2, owing to can make the 2nd pattern or the frequency ratio of lighting a lamp in the 3rd pattern that are inserted in the common some modulation frequency high in the past, so that the power supply of drive circuit is guaranteed to become is easier than in the past.In addition, can make with the light output of putting modulation frequency usually and the amplitude of variation of power to diminish, can reduce flicker (flicker).

According to the invention of technical scheme 3, because it is higher to make the 2nd pattern that is inserted in the common some modulation frequency or the frequency ratio of lighting a lamp in the 3rd pattern put modulation frequency usually, so that the power supply of drive circuit is guaranteed to become is easier.In addition, the amplitude of the rise and fall of electrode temperature diminishes, so the time decreased that electrode temperature descends can more effectively make the temperature of electrode rise, can reduce flicker (flicker).

Invention according to technical scheme 4, because according to the average power variation point modulation frequency that drops into to high-pressure discharge lamp, so the size of projection can be maintained with the footpath, and make the value of size for wishing of projection, the condition that can reduce the flicker of high-pressure discharge lamp can be set at according to average power, the flicker (flicker) of high-pressure discharge lamp can be reduced to the high-pressure discharge lamp input.

Invention according to technical scheme 5, owing in the 2nd pattern or the 3rd pattern, change duty ratio according to average power to the high-pressure discharge lamp input, so can change scope with unnecessary projection fusion, the condition that can reduce the flicker of high-pressure discharge lamp can be set at according to average power, the flicker (flicker) of high-pressure discharge lamp can be reduced to the high-pressure discharge lamp input.

According to the invention of technical scheme 6, because according to during at least 1 pattern of average power change that drops into to high-pressure discharge lamp, so, also can be set at the condition of the flicker that can reduce high-pressure discharge lamp even the average power that drops into to high-pressure discharge lamp changes.

Invention according to technical scheme 7, changing under the situation of the power that high-pressure discharge lamp drops into, the frequency number of lighting a lamp in each pattern, duty ratio, at least change two projects in the project during this time, so can be according to being maintained with the footpath to the average power of high-pressure discharge lamp input size with projection, and the size that makes projection becomes the value of hope, in addition, can change scope with unnecessary projection fusion, the condition that can reduce the flicker of high-pressure discharge lamp can be set at according to average power, the flicker (flicker) of high-pressure discharge lamp can be reduced to the high-pressure discharge lamp input.

Invention according to technical scheme 8, because modulating voltage according to high-pressure discharge lamp, the frequency number of lighting a lamp in each pattern, duty ratio, during project in change 1 project at least, so can be according to being maintained with the footpath to the average power of high-pressure discharge lamp input size with projection, and the size that makes projection becomes the value of hope, in addition, can change scope with unnecessary projection fusion, the condition that can reduce the flicker of high-pressure discharge lamp can be set at according to average power, the flicker (flicker) of high-pressure discharge lamp can be reduced to the high-pressure discharge lamp input.

Invention according to technical scheme 9, since make the 2nd pattern, the 3rd pattern duty ratio be not equal to 100%, with and/or make during the 2nd pattern and the 3rd pattern different, even so in the Temperature Distribution of two electrodes, take place under the situation of bias because of the installation of the air-cooled conditioned disjunction reflector of high-pressure discharge lamp, duty ratio that also can be by making the 2nd pattern and the 3rd pattern or during different, two interelectrode temperature are become evenly, can reduce the flicker (flicker) of high-pressure discharge lamp.

According to the invention of technical scheme 10, owing to possess each described high-voltage discharging lamp device in the technical scheme 1～9, so can provide the flicker of high-pressure discharge lamp less image display device.

Description of drawings

Fig. 1 is the action specification figure of embodiments of the present invention 1.

Fig. 2 is the action specification figure of embodiments of the present invention 2.

Fig. 3 is the circuit diagram of the circuit structure of expression embodiments of the

present invention

1,2.

Fig. 4 is the key diagram of the drive circuit of use in embodiments of the

present invention

1,2, and Fig. 4 (a) is the circuit diagram of the structure of expression drive circuit, and Fig. 4 (b) is the oscillogram of the action of expression drive circuit.

Fig. 5 is with the key diagram of embodiments of the present invention 1 with the situation contrast expression of the decay of the supply voltage of the drive circuit of conventional example.

Fig. 6 is the key diagram with the situation contrast expression of the variation of the decay of the supply voltage of the drive circuit of embodiments of the present invention 2 and conventional example and electrode temperature.

Fig. 7 is with the key diagram of embodiments of the present invention 1 with the variation contrast expression of the electrode temperature of conventional example.

Fig. 8 is with the key diagram of embodiments of the present invention 2 with the variation contrast expression of the electrode temperature of conventional example.

Fig. 9 is the performance plot that is used for the action specification of embodiments of the

present invention

1,2.

Figure 10 is the key diagram of form of combination of the pattern of lighting a lamp of expression embodiments of the

present invention

1,2.

Figure 11 is the action specification figure of embodiments of the present invention 3.

Figure 12 is the action specification figure of embodiments of the present invention 4.

Figure 13 is the action specification figure of embodiments of the present invention 5.

Figure 14 is the action specification figure of embodiments of the present invention 6.

Figure 15 is the action specification figure of embodiments of the present invention 7.

Figure 16 is the action specification figure of embodiments of the present invention 8.

Figure 17 is the summary construction diagram of the high-pressure discharge lamp that uses in electrion ignition device of the present invention.

Figure 18 is the summary construction diagram that has carried the image display device of high-pressure discharge lamp operation device of the present invention.

Embodiment

(execution mode 1)

The electrion ignition device of present embodiment is after discharge lamp begins to light a lamp, after roughly reaching stable state or after reaching the modulating voltage of regulation, under each average power (electric power) that discharge lamp is dropped into, as shown in Figure 1, make discharge lamp lighting with at least 3 patterns of lighting a lamp.

It is characterized in that, in " pattern 1 " as the 1st pattern, the duty ratio of some modulation frequency (Duty ratio) is 50% ratio, in " pattern 2 " as the 2nd pattern, the duty ratio of some modulation frequency is the ratio (being 80% in example) greater than 50%, in " mode 3 " as the 3rd pattern, the duty ratio of some modulation frequency is the ratio (being 20% in example) less than 50%, the frequency f 2 of lighting a lamp of pattern 2 and mode 3, what f3 was made as pattern 1 lights a lamp frequency f below 1, t1 during each pattern, t2, t3 is more than 1 cycle at least, with pattern 1, pattern 2, mode 3 each 1 pattern at least carries out this 1 group repeatedly as 1 group (constituting 1 group by " pattern 2 → pattern 1 → mode 3 → pattern 1 " in example).

Fig. 3 is the circuit diagram that is used for implementing the electrion ignition device of control of the present invention.This ignition device is with the structure of buck circuit 11 with polarity inversion circuit 12 combinations.Is suitable voltage from the direct voltage of power circuit E output by buck circuit 11 step-downs, is transformed to rectangular-wave alternating-current voltage by polarity inversion circuit 12.The output of polarity inversion circuit 12 is connected with resonant circuit 13 with the startup that is made of capacitor C2 and inductor L2, is connecting discharge lamp La at the two ends of capacitor C2.

Power circuit E for example comprises commercial (industry) AC power is carried out the rectification unit and the power-factor improvement of rectification and smoothly used boost chopper, for example exports the direct voltage of hundreds of V.

Buck circuit 11 comprises with high-frequency is switched on diode D1, smoothing capacitor C1 and current detecting resistance R1 with inductor L1, regenerative current by the switch element Q1 of switch, store energy, pulse duration by variable control switch element Q1, make from the direct voltage step-down of power circuit E output, capacitor C1 is charged.

Polarity inversion circuit 12 is full bridge inverters that the series circuit by the series circuit of switch element Q2, Q3 on the two ends that are connected in capacitor C1 in parallel and switch element Q4, Q5 constitutes, by alternately diverter switch element Q2, Q5 are that connection, switch element Q3, Q4 are the state of connecting for state and switch element Q2, the Q5 that disconnects for disconnection, switch element Q3, Q4, with the polarity inversion of the direct voltage of capacitor C1, load circuit is supplied with rectangular-wave alternating-current voltage.

Load circuit comprises the discharge lamp La on resonant circuit 13 that is made of capacitor C2 and inductor L2 and the two ends that are connected in capacitor C2 in parallel.Discharge lamp La is the high brightness high-pressure discharge lamp (HID lamp) of extra-high-pressure mercury vapour lamp or metal halide lamp etc.

Control circuit 14 is alternately connected disconnection by switch element Q2, Q5 and switch element Q3, the Q4 that will be configured in diagonal position under the situation of lighting a lamp of beginning discharge lamp La, the two ends of resonant circuit 13 are applied the high frequency voltage of tens kHz～hundreds of kHz.Resonance effect by resonant circuit 13 is boosted this high frequency voltage, makes capacitor C2 produce the resonance voltage of high pressure, is applied on the discharge lamp La, causes insulation breakdown thus, and discharge lamp La is lit a lamp.Then,, then,, to keep and light a lamp with high-frequency action (hundreds of msec～tens second about) a little while in order to shift low-frequency square-wave voltage that discharge lamp La applies tens Hz～hundreds of Hz to arc discharge.

In addition, though diagram not, also can with resonant circuit 13 independently and use ignitor circuit, this ignitor circuit to produce to be used for the high voltage pulse that makes discharge lamp La startup or restart.Ignitor circuit both can be to carry out the structure that high frequency when action starts at polarity inversion circuit 12, also can be from making polarity inversion circuit 12 carry out the structure that low frequency action, high voltage pulse by ignitor circuit are lit a lamp discharge lamp La insulation breakdown at first.

Voltage detecting circuit 15 carries out dividing potential drop with the output voltage of buck circuit 11 series circuit by resistance R 2, R3 and detects.The detection output of voltage detecting circuit 15 is imported in the personal computer 20 of control circuit 14, is transformed to digital value by A/D converter 21.The control of the power of personal computer 20 with reference signal generating unit 22 in, according to by lamp voltage detection circuit 15 detected magnitudes of voltage, comparable data table 23 computing lamp power controlled quentity controlled variable is transformed to power instruction voltage Ip by D/A converter 16.D/A converter 16 for example uses R-2R ladder resistor circuit etc.In pwm control circuit 17,, carry out copped wave control, control lamp power (lamp current) by comparing by the detection voltage and the power instruction voltage Ip of the detected chopper current of current sense resistor R1.

As the personal computer 20 of control circuit 14, for example use R8C/26,27 groups or R8C/2E, the 2F etc. of the R8C/Tiny series of (strain) Rui Sa scientific ﹠ technical corporation.In Fig. 3, the function of personal computer 20 is carried out piecemeal represent.

In handling part 24 is set in time measurement, carry out the timing controlled of polarity inversion of polarity inversion circuit 12 and the measurement of time, to full-bridge control part 12c output full-bridge control signal FB1, FB2.

Drive circuit 12a constitutes as Fig. 4 (a), according to the full-bridge control signal FB1 ' from full-bridge control part 12c, hot side switch element Q2 and low potential side switch element Q3 is controlled to be alternately connection disconnection.The structure of drive circuit 12b is also same with Fig. 4 (a), according to the full-bridge control signal FB2 ' from full-bridge control part 12c, hot side switch element Q4 and low potential side switch element Q5 is controlled to be alternately connection disconnection.

In power discriminating processing portion 25, the average power that acceptance is made of optical coupler PC1 and resistance R 4 changes the output signal of signal receiving circuit, reception is differentiated from the power of image display device side indication from the average power setting signal CS1 of image display device.For example wait the indication of carrying out to the average power (electric current) of discharge lamp La input by UART communication.With communications command etc. and image display device side coupling, and receive this order, thereby discharge lamp ignition device is exported the average power (electric current) that is suitable for this order.

In tables of data 23, preserve power controlled quentity controlled variable data (a plurality of performance number) corresponding to modulating voltage Vla.Power controlled quentity controlled variable data shown in Fig. 9 (a), are set power likely (electric current) according to each Vla.In the example of Fig. 9 (a), prepared to light a lamp entirely (Full) and light a lamp two kinds of data of (Dim) of light modulation, but its quantity does not limit.

In tables of data 23, in addition, as described later, light a lamp pattern and preserve the data of timing (frequency, duty ratio) of the polarity inversion that makes polarity inversion circuit 12 and the data of (number of times of time and polarity inversion) during each corresponding to each average power.The control of polarity inversion circuit 12 is comparable data tables 23, calculate each average power lights a lamp respectively that (number of times of time and polarity inversion) carries out during the timing that makes polarity inversion (frequency, duty ratio) under the pattern and each.

In lamp on/off discriminating processing portion 26, accept the output signal of the high-pressure discharge lamp on/off signal receiving circuit that constitutes by optical coupler PC2 and resistance R 5, receive high-pressure discharge lamp on/off signal CS0 from image display device.

If instructed the connection (lighting a lamp) of high-pressure discharge lamp by high-pressure discharge lamp on/off signal CS0 from the image display device side, then by making polarity inversion circuit 12 carry out the high frequency action, resonance effect by resonant circuit 13 produces high voltage, make discharge lamp La insulation breakdown and start, shift to the low frequency action, according to the control characteristic of Fig. 9 (a), control lamp current Ila, lamp power Wla then according to modulating voltage Vla.

Lamp current control (control of lamp power) is shown in Fig. 9 (a), reach V0 (during light modulation: V0 ') before at modulating voltage Vla, carry out lamp current Ila and be certain (=Ila0) constant current control, (during light modulation: V0 ') afterwards, carrying out lamp power Wla is certain permanent power control to reach V0 at modulating voltage Vla.

On time reference, carry out the control shown in Fig. 9 (b).Lamp power Wla, lamp current Ila after Fig. 9 (b) expression discharge lamp La starts, the variation of modulating voltage Vla along with the process of time.Before time t0, by constant current be controlled to be lamp current Ila certain (=Ila0), modulating voltage Vla rises, if the modulating voltage V0 that reaches regulation is (during light modulation: V0 '), then shift to permanent power control.Then, rise to by the modulating voltage V1 of the state of discharge lamp La (dropping into power, electrode state (interelectrode distance etc.) and air-cooled condition) decision and become stable state.

For example, in Fig. 9 (b), after discharge lamp roughly reaches stable state (about t=ta), perhaps when having reached the modulating voltage V0 that begins the control of permanent power (during light modulation: V0 '), as shown in Figure 1, for example make up 3 patterns and of lighting a lamp with discharge lamp lighting.

In pattern 1 (the 1st light a lamp pattern), the point modulation frequency is f1 (generally for example selecting from 50Hz～1kHz), duty ratio is 50%, be t1 (more than 1 cycle of the frequency f of lighting a lamp 1) during this time, in pattern 2 (the 2nd light a lamp pattern), the point modulation frequency is f2 (frequency f is selected below 1 from lighting a lamp), duty ratio is 80%, be t2 (more than 1 cycle of the frequency f of lighting a lamp 2) during this time, in mode 3 (the 3rd light a lamp pattern), the point modulation frequency is f3 (frequency f is selected below 1 from lighting a lamp), duty ratio is 20%, be t3 (more than 1 cycle of the frequency f of lighting a lamp 3) during this time, in the example of Fig. 1, the frequency f 2 of lighting a lamp of pattern 2 and mode 3, f3 is made as the frequency f 1 identical (f1=f2=f3) of lighting a lamp with pattern 1, be more than 1 cycle during each pattern, be made as t1＞t2=t3, with pattern 1, pattern 2, mode 3 as 1 group, carries out this 1 group with the order of " pattern 2 → pattern 1 → mode 3 → pattern 1 " repeatedly.With pattern 2 and mode 3 be made as identical during, make duty ratio be 100% to be to distribute identical for the electrode temperature that makes two electrode A, B (with reference to Figure 17).

According to the present invention, as contrast at Fig. 5 (a), Fig. 5 (b), compare with the conventional example of

patent documentation

1,2, can make the low-frequency frequency gets higher that is inserted in the common some modulation frequency, can make light output and power compare amplitude of variation and diminish, can reduce flicker (flicker) with common some modulation frequency.

In addition, shown in the solid line of Fig. 5 (c), under the situation of the 2nd, the 3rd pattern, tail off as the driving of the hot side switch element Q2 of the drive circuit 12a of polarity inversion circuit 12 variation in voltage with the capacitor C3 of power supply.As the lamp current (Fig. 5 (a)) of conventional example, in the frequency lower than common some modulation frequency, the boundary during can inserting (the time tmax of Fig. 5 (c)) is subjected to keep the above conditionality of threshold voltage vt h of the connection that can realize hot side switch element Q2.With respect to this, if as lamp current of the present invention (Fig. 5 (b)), control, then when hot side switch element Q2 disconnects to drive capacitor C3 charging charge as hot side with power supply, so compare with the technology of

patent documentation

1,2, the boundary tmax of set point prolongs under the identical situation of the capacitance of capacitor C3, in addition, be under the situation with the same time tmax of

patent documentation

1,2, the capacitance of capacitor C3 is diminished.

That is, the degree of freedom that is inserted into the low-frequency frequency in the common some modulation frequency and inserts the setting of time increases, and can also realize miniaturization, the cost degradation of circuit.

In addition, can in the 1st pattern, on electrode, form projection, in the 2nd pattern and the 3rd pattern, make the electrode temperature of high-pressure discharge lamp rise to the temperature roughly same (can access the effect same) as shown in Figure 7 with

patent documentation

1,2 with the technology of

patent documentation

1,2, can make unnecessary projection fusion, make not generate unnecessary projection, can reduce the flicker (flicker) of high-pressure discharge lamp.

Here, the pass of two electrode A of discharge lamp La, the electrode temperature of B (with reference to Figure 17) is, the electrode temperature T of Fig. 7 for example is the temperature of electrode A, if the hygral equilibrium of electrode A, B is uniformly, then the electrode temperature of electrode B is for being the temperature that benchmark reverses up and down with electrode temperature T1.

In addition, even at

pattern

1,2,3 medium frequency f1, f2, f3 roughly the same (f2, f3 ≈ f1), also can in pattern 1, on electrode, form projection, the electrode temperature of discharge lamp is risen, with unnecessary projection fusion, can reduce the flicker (flicker) of discharge lamp.

Because the time point light output in the change in polarity of the lamp current that flows through discharge lamp descends, if have and the different frequency of common some modulation frequency so mix, though then also depend on the degree of the difference of frequency, but the light of time per unit output changes, so the flicker (flicker) that variation that might occurrence frequency brings.If the frequency of each pattern is roughly the same, the polarity inversion number of times that then flows through the lamp current of discharge lamp does not change, so the not flicker (flicker) that brings of the difference of occurrence frequency.

In addition, owing to also descend to the power of discharge lamp input, so average power content changes according to the number of times of polarity inversion at the time point of the change in polarity of the lamp current that flows through discharge lamp.Amplitude of variation at average power content becomes under the situation of problem, need carry out the control of corrected output controlled quentity controlled variable so that pattern 1 and

pattern

2,3 separately in average power roughly the same.Thus, the frequency of each pattern roughly the same flicker reduce and the easness of the design of power control aspect also be preferred.

(execution mode 2)

The electrion ignition device of present embodiment is after discharge lamp begins to light a lamp, after roughly reaching stable state or after having reached the modulating voltage of regulation, under each average power that discharge lamp is dropped into, as shown in Figure 2, make discharge lamp lighting with at least 3 patterns of lighting a lamp.Circuit structure also can be identical with execution mode 1.

In " pattern 1 " as the 1st pattern, the duty ratio of some modulation frequency is 50% ratio, in " pattern 2 " as the 2nd pattern, the duty ratio of some modulation frequency is the ratio (being 80% in example) greater than 50%, in " mode 3 " as the 3rd pattern, the duty ratio of some modulation frequency is the ratio (being 20% in example) less than 50%, the frequency f 2 of lighting a lamp of pattern 2 and mode 3, at least one of f3 is than frequency f 1 height of lighting a lamp of pattern 1, t1 during each pattern, t2, t3 is more than 1 cycle at least, with pattern 1, pattern 2, mode 3 each 1 pattern at least carries out this 1 group repeatedly as 1 group (constituting 1 group by " pattern 2 → pattern 1 → mode 3 → pattern 1 " in example).

In the present embodiment, make at least one of light a lamp frequency f 2, f3 of pattern 2 and mode 3 more different with execution mode 1 than the frequency f 1 high this point of lighting a lamp of pattern 1.By Fig. 5 (execution mode 1) its effect of comparative illustration with contrast, Fig. 7 (execution mode 1) and Fig. 8 (execution mode 2) of Fig. 6 (execution mode 2).

At first, Fig. 6 is with the situation contrast expression of the variation of the decay of embodiments of the present invention 2 and the supply voltage of the drive circuit of conventional example and electrode temperature.Fig. 6 (a) is the lamp current in the conventional example of

patent documentation

1,2, and Fig. 6 (b) is the lamp current in the execution mode 2.If with the lamp current contrast in the execution mode 1 shown in Fig. 5 (b), then in execution mode 2, to set than common some modulation frequency (frequency f 1 of lighting a lamp of pattern 1) height as the frequency f 2 of lighting a lamp, the f3 of the pattern during the heated by

electrodes

2,3, so the decay of the supply voltage of drive circuit (voltage of capacitor C3) is compared with execution mode 1 and become slower as can be known.

That is, shown in the solid line of Fig. 6 (c), in pattern 2,3, become still less as the driving of the hot side switch element Q2 of the drive circuit 12a of polarity inversion circuit 12 variation in voltage with the capacitor C3 of power supply.As implement shown in the lamp current (Fig. 5 (b)) of mode 1, under the situation below the frequency f 2 of lighting a lamp, f3 in the pattern 2,3 being set at common some modulation frequency (frequency f 1 of lighting a lamp of pattern 1), the variation in voltage of the capacitor C3 in the variation in voltage of the capacitor C3 in the pattern 2,3 and the pattern 1 is identical or more than it.With respect to this, as implement shown in the lamp current (Fig. 6 (b)) of mode 2, the frequency f 2 of lighting a lamp, f3 in the pattern 2,3 are being set than putting usually under the high situation of modulation frequency (frequency f 1 of lighting a lamp of pattern 1), be refreshed with the voltage of the capacitor C3 of power supply cycle as the driving of hot side switch element Q2, reduced so the variation in voltage of the capacitor C3 in the variation in voltage of the capacitor C3 in the pattern 2,3 and the pattern 1 is compared with higher light a lamp frequency f 2, f3.

Then, Fig. 8 is with the variation contrast expression of embodiments of the present invention 2 with the electrode temperature of conventional example.In execution mode 2, even the frequency f 2 of lighting a lamp in pattern 2 and the mode 3, f3 are than frequency f 1 height of lighting a lamp in the pattern 1, if being conceived to duty ratio compares, then the duty ratio of pattern 2 and mode 3 (80% or 20%) is compared with the duty ratio (50%) of pattern 1, duty ratio (100% or 0%) in during the low frequency that approaches conventional example is inserted, so in pattern 1, on electrode, form projection, the electrode temperature of discharge lamp is risen, unnecessary projection fusion also can be able to be reduced the flicker (flicker) of discharge lamp.In addition, if compare with Fig. 7 (execution mode 1), then owing to will set as the frequency f 2 of lighting a lamp, the f3 in the pattern during the heated by electrodes 2,3 than putting modulation frequency (frequency f 1 of lighting a lamp of pattern 1) height usually, so the amplitude of the rise and fall of electrode temperature diminishes, therefore the time decreased of the temperature of electrode decline can more effectively make the temperature of electrode rise.

Here, the pass of two electrode A of discharge lamp La, the electrode temperature of B (with reference to Figure 17) is, the electrode temperature T of Fig. 8 for example is the temperature of electrode A, if the hygral equilibrium of electrode A, B is uniformly, then to become with electrode temperature T1 be the temperature that benchmark reverses up and down to the electrode temperature of electrode B.

According to shape and the air-cooled condition of the reflector R of Figure 17, the uneven situation of hygral equilibrium of electrode A, B might be arranged also.Under these circumstances, shown in Fig. 2 (b), the electrode that the duty ratio that also can make pattern 2 is 80%, descend easily for temperature heat significantly and make the duty ratio of mode 3 be 49% on the other hand, control that the electrode that rises easily for temperature less heats.In addition, shown in Fig. 2 (a), the duty ratio that also can establish pattern 2 is 80%, the duty ratio of mode 3 be 20% set up an office modulation frequency be f2 (＞f1), f3 (≤f1) control.

In addition, in

execution mode

1 or 2, it is such that the combination of the pattern of lighting a lamp also can be made as Figure 10.In each following execution mode, also be same.

Example shown in Figure 10 (b1) is the combination same with Fig. 1, Fig. 2, and the pattern 1～3 of Figure 10 (a), is carried out this 1 group as 1 group repeatedly according to the sequential combination of pattern 2 → pattern 1 → mode 3 → pattern 1.

The example of Figure 10 (b2), carries out this 1 group as 1 group repeatedly with the order of pattern 2 → mode 3 → pattern 1.

The example of Figure 10 (b3), carries out this 1 group as 1 group repeatedly with the order of pattern 2 → mode 3 → pattern 2 → pattern 1 → mode 3 → pattern 2 → mode 3 → pattern 1.

The example of Figure 10 (b4), carries out this 1 group as 1 group repeatedly with the order of pattern 2 → mode 3 → pattern 2 → mode 3 → pattern 1.

In addition, in Figure 10 (a), the some modulation frequency of each pattern 1～3 be combined as f1, f2 (≤f1), (corresponding to above-mentioned execution mode 1, other situations are corresponding to execution mode 2 under≤f1) the situation for f3.

In

execution mode

1,2, the order of the pattern of lighting a lamp and repeatedly number of times, combination do not limit, as long as it is just passable to be set at the combination of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

In addition, in

execution mode

1,2, the value of (time), each magnitude relationship etc. are also unqualified during the some modulation frequency of the 1st pattern～the 3rd each pattern, duty ratio, the 1st～the 3rd each pattern of the 2nd, the 3rd each pattern, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.In addition, the light a lamp number of pattern also can be more than 3.

By being made as above structure, action, according to

execution mode

1,2, can realize the cost degradation of circuit, not retrained by the design considerations of circuit, design freedom corresponding to each high-pressure discharge lamp uprises, and can reduce the flicker of high-pressure discharge lamp by fairly simple control (some modulation frequency, duty when during control).

(execution mode 3)

In the present embodiment, be characterised in that, changing under the situation of the power that high-pressure discharge lamp drops into variation point modulation frequency at least 1 pattern in each pattern.Circuit structure can be identical with execution mode 1.

The action of present embodiment for example is that Figure 11 is such.Changing to from power P 1 to the average power of high-pressure discharge lamp input under the situation of power P 2, the 1st point modulation frequency of lighting a lamp pattern is changed to f1 ' from f1.In addition, changing to from power P 2 to the average power of high-pressure discharge lamp input under the situation of power P 1, the 1st point modulation frequency of lighting a lamp pattern is changed to f1 from f1 '.In the example of Figure 11, when power P 1＞power P 2, be made as frequency f 1＞frequency f 1 '.

In this embodiment, the 1st lights a lamp pattern during generating projection on the electrode, is to make the size of projection in the roughly the same situation in the front and back of variable power.This is because if generally power (electric current) diminishes then electrode temperature decline, so the size of projection diminishes, in addition, the size of the low more then projection of some modulation frequency is big more.In the size of the projection also passable situation that diminishes, both can be original frequency, also can make frequency gets higher.

In the example of Figure 11, be two kinds of P1 and P2 to the power of high-pressure discharge lamp input, but the situation more than 3 kinds make the frequency change of lighting a lamp too.

Making the pattern of lighting a lamp of the frequency change of lighting a lamp be not limited to the 1st pattern of lighting a lamp, also can be the 2nd pattern or the 3rd pattern of lighting a lamp of lighting a lamp.The order of the pattern of lighting a lamp is not limited to illustrative situation among Figure 11.

In addition, the increase and decrease relation of power and the increase and decrease of frequency relation is not limited to illustrative relation among Figure 11, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

(execution mode 4)

In the present embodiment, be characterised in that, under the situation of the power that high-pressure discharge lamp drops into, change duty ratio at least 1 pattern in the 2nd or the 3rd pattern in change.Circuit structure can be identical with execution mode 1.

The action of present embodiment for example is that Figure 12 is such.In the average power to the high-pressure discharge lamp input is under the situation of P1, making the 2nd duty ratio of lighting a lamp pattern is that the 80%, the 3rd duty ratio of lighting a lamp pattern is 20%, and be that (under＜P1) the situation, make the 2nd duty ratio of lighting a lamp pattern is that the 90%, the 3rd duty ratio of lighting a lamp pattern is 10% to P2 in average power to the high-pressure discharge lamp input.

In this example, the 2nd pattern, the 3rd pattern be the surface temperature that makes electrode rise, unnecessary projection fusion is made do not produce a plurality of projections during, under the lower-powered situation that drops into, be controlled to be the imbalance increase of duty ratio.This be because, electrode temperature descends if general electric current diminishes, the temperature range of fusion narrows down, so the time lengthening when electrode is anode and the surface temperature of electrode is risen enlarges the temperature range of wishing.

In the example of Figure 12, be two kinds of P1 and P2 to the power of high-pressure discharge lamp input, but under the situation more than 3 kinds, make change in duty cycle too.

The pattern of lighting a lamp that makes change in duty cycle be the 2nd light a lamp pattern or the 3rd light a lamp which kind of of pattern can.In addition, the light a lamp order of pattern is not limited to illustrative situation among Figure 12.

And then the numerical value about the duty ratio before and after changing also is not limited to illustrative numerical value among Figure 12.

In addition, the increase and decrease relation of power and the increase and decrease of duty ratio relation is not limited to illustrative relation among Figure 12, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

(execution mode 5)

In the present embodiment, be characterised in that, in change under the situation of the power that high-pressure discharge lamp drops into, at least 1 pattern in each pattern this pattern of change during.Circuit structure can be identical with execution mode 1.

The action of present embodiment for example is that Figure 13 is such.In the average power to the high-pressure discharge lamp input is under the situation of P1, the 2nd light a lamp pattern, the 3rd light a lamp pattern during (time) for t2, and the average power to the high-pressure discharge lamp input be P2 (under＜P1) the situation, the 2nd light a lamp pattern, the 3rd light a lamp pattern during (time) for t2 ' (＞t2).

In this example, the 2nd pattern, the 3rd pattern be the surface temperature that makes electrode rise, unnecessary projection fusion is made do not produce a plurality of projections during, elongated during being controlled to be under the lower-powered situation of input.This be because, electrode temperature descends if general power (electric current) diminishes, the temperature range of fusion narrows down, and rises so the total ascent time of the time when electrode is anode prolongs the surface temperature that makes electrode, enlarges the temperature range of wishing.

In the example of Figure 13, be two kinds of P1 and P2 to the power of voltage discharge lamp input, but during making too under the situation more than 3 kinds (time) change.

The pattern of lighting a lamp that (time) changes during making both can be the 1st pattern of lighting a lamp, and also can be the 2nd light a lamp any of pattern of pattern or the 3rd of lighting a lamp, in a word, as long as during at least 1 is lit a lamp pattern, making (time) change just passable.In addition, the light a lamp order of pattern is not limited to illustrative situation among Figure 13.

And then, about during the variation front and back (time), also be not limited to illustrative length among Figure 13.

In addition, increase and decrease relation during the increase and decrease of power relation and each pattern is not limited to illustrative relation among Figure 13, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

(execution mode 6)

In the present embodiment, be characterised in that, changing under the situation of the power that high-pressure discharge lamp drops into, change some modulation frequency in each pattern, duty ratio, during project at least two projects, the project of change be under the situation of a modulation frequency in the 1st～the 3rd pattern, be each value of change at least 1 pattern in the 1st～the 3rd pattern under the situation in the 2nd pattern or the 3rd pattern, during being under the situation of duty ratio.Circuit structure can be identical with execution mode 1.

The action of present embodiment for example is that Figure 14 is such.Changing to from power P 1 to the average power of high-pressure discharge lamp input under the situation of power P 2, the 1st point modulation frequency of lighting a lamp pattern is changed to f1 ' from f1.In addition, changing to from power P 2 to the average power of high-pressure discharge lamp input under the situation of power P 1, the 1st point modulation frequency of lighting a lamp pattern is changed to f1 from f1 '.In the example of Figure 14, when power P 1＞P2, be made as frequency f 1＞frequency f 1 '.

In addition, in the average power to the high-pressure discharge lamp input is under the situation of P1, making the 2nd duty ratio of lighting a lamp pattern is that the 80%, the 3rd duty ratio of lighting a lamp pattern is 20%, and be that (under＜P1) the situation, make the 2nd duty ratio of lighting a lamp pattern is that the 90%, the 3rd duty ratio of lighting a lamp pattern is 10% to P2 in average power to the high-pressure discharge lamp input.

And then, in the average power to the high-pressure discharge lamp input is under the situation of P1, the 2nd light a lamp pattern, the 3rd light a lamp pattern during (time) for t2, and the average power to the high-pressure discharge lamp input be P2 (under＜P1) the situation, the 2nd light a lamp pattern, the 3rd light a lamp pattern during (time) for t2 ' (＞t2).

In this example, the 1st pattern is to make the size of projection in the roughly the same situation in the front and back of variable power during generating projection on the electrode.This is because if generally power (electric current) diminishes then electrode temperature decline, so the size of projection diminishes, in addition, the size of the low more then projection of some modulation frequency is big more.Under the size of projection diminishes also passable situation, both can be original frequency, also can make frequency gets higher.

In addition, the 2nd pattern, the 3rd pattern be the surface temperature that makes electrode rise, unnecessary projection fusion is made do not produce a plurality of projections during, elongated during being controlled to be under the lower-powered situation of input.This be because, electrode temperature descends if general power (electric current) diminishes, the temperature range of fusion narrows down, so the total ascent time of the time when time when electrode is anode and electrode are negative electrode prolongs and the surface temperature of electrode is risen, enlarges the temperature range of wishing.

In the example of Figure 14, be two kinds of P1 and P2 to the power of high-pressure discharge lamp input, but make too under the situation more than 3 kinds a modulation frequency, duty ratio, pattern during (time) change.

Making the pattern of lighting a lamp of the frequency change of lighting a lamp be not limited to the 1st pattern of lighting a lamp, also can be the 2nd pattern or the 3rd pattern of lighting a lamp of lighting a lamp.

The pattern of lighting a lamp that makes change in duty cycle can be the 2nd light a lamp in the pattern any of pattern or the 3rd of lighting a lamp.

The pattern of lighting a lamp that (time) changes during making also can be the 1st pattern of lighting a lamp, and also can be the 2nd light a lamp any of pattern of pattern or the 3rd of lighting a lamp, in a word, as long as during in 1 pattern of lighting a lamp, making at least (time) change just passable.In addition, the light a lamp order of pattern is not limited to illustrative situation among Figure 14.

And then, during about the numerical value of the frequency before and after changing, duty ratio, before and after changing (time) also unqualified, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

(execution mode 7)

In the present embodiment, be characterised in that, in each of above-mentioned execution mode 1～5, modulating voltage Vla according to high-pressure discharge lamp, change some modulation frequency under each pattern, duty ratio, during project at least 1 project, the project of change be under the situation of a modulation frequency in the 1st～the 3rd pattern, be each value of change at least 1 pattern in the 1st～the 3rd pattern under the situation in the 2nd pattern or the 3rd pattern, during being under the situation of duty ratio.Circuit structure also can be identical with execution mode 1.

The action of present embodiment for example is that Figure 15 is such.Figure 15 (a) is modulating voltage Vla and the relation of the average power Wla that drops into to high-pressure discharge lamp La, Figure 15 (b) is modulating voltage Vla and the relation of the electric current I la that drops into to high-pressure discharge lamp La, Figure 15 (c), Figure 15 (f) are modulating voltage Vla and the relation of the frequency that high-pressure discharge lamp La is lit a lamp, Figure 15 (d) is the relation of the duty ratio of modulating voltage Vla and lamp current, the relation of (time) during Figure 15 (e) modulating voltage Vla and the 1st～the 3rd pattern.The pass of modulating voltage Vla and the frequency that high-pressure discharge lamp La is lit a lamp ties up under the situation of above-mentioned execution mode 1 to Figure 15 (c), is the relation of Figure 15 (f) under the situation of above-mentioned execution mode 2.

After the beginning of lighting a lamp of high-pressure discharge lamp, after the modulating voltage V0 that has reached regulation, with the 1st pattern, the 2nd pattern, the 3rd pattern each 1 mode combinations and, this 1 group being carried out repeatedly at least as 1 group.In this example, the some modulation frequency of the 2nd pattern and the 3rd pattern, during (time) be identical value, make the 2nd pattern, the 3rd pattern duty ratio and be 100%.

Shown in Figure 15 (c), modulating voltage V1 as threshold value, if modulating voltage Vla becomes than threshold value V1 height, is then changed to f1 ' with the 1st point modulation frequency of lighting a lamp pattern from f1, the 2nd, the 3rd point modulation frequency of lighting a lamp pattern is changed to f2 ' from f2.In addition,, then the 1st point modulation frequency of lighting a lamp pattern is changed to f1 from f1 ', the 2nd, the 3rd point modulation frequency of lighting a lamp pattern is changed to f2 from f2 ' if modulating voltage Vla becomes below the threshold value V1.Here, make f1＞f1 ', f2＞f2 '.

In this example, the 1st pattern generates during the projection, is to make the size of projection in the roughly the same situation in the front and back of the threshold value V1 of modulating voltage Vla.This is because if generally power (electric current) diminishes then electrode temperature decline, so the size of projection diminishes, in addition, the size of the low more then projection of some modulation frequency is big more.Under the size of projection diminishes also passable situation, both can be original frequency, also can make frequency gets higher.

In addition, shown in Figure 15 (d), the 1st duty ratio of lighting a lamp pattern keeps 50%, switches the 2nd, the 3rd duty ratio of lighting a lamp pattern in the front and back of the threshold value V1 of modulating voltage Vla.That is, modulating voltage V1 as threshold value, if modulating voltage Vla becomes than threshold value V1 height, is then changed to duty2 ' with the 2nd duty ratio of lighting a lamp pattern from duty2.In addition, if modulating voltage Vla becomes below the threshold value V1, then the 2nd duty ratio of lighting a lamp pattern is changed to duty2 from duty2 '.

In the present embodiment, make the 2nd, the 3rd light a lamp pattern duty ratio and be 100%.That is,, then the 3rd duty ratio of lighting a lamp pattern is changed to (100-duty2 ') from (100-duty2) if modulating voltage Vla becomes than threshold value V1 height.In addition, if modulating voltage Vla becomes below the threshold value V1, then the 3rd duty ratio of lighting a lamp pattern is changed to (100-duty2) from (100-duty2 ').In this example, be duty2＜duty2 ', for example duty2 is 80%, duty2 ' is 90%.

And then, shown in Figure 15 (e), the 1st light a lamp pattern during (time) keep t1, the front and back of the threshold value V1 of modulating voltage Vla switch the 2nd, the 3rd light a lamp pattern during (time).That is, with modulating voltage V1 as threshold value, if modulating voltage Vla becomes than threshold value V1 height, then with the 2nd, the 3rd light a lamp pattern during (time) change to t2 ' from t2.In addition, if modulating voltage Vla becomes below the threshold value V1, then with the 2nd, the 3rd light a lamp pattern during (time) change to t2 from t2 '.Here, make t2＜t2 '.

In this example, the 2nd pattern, the 3rd pattern be the surface temperature that makes electrode rise, with unnecessary projection fusion and feasible do not produce a plurality of projections during, electrode temperature descends if electric current diminishes, the temperature range of fusion narrows down, so the total ascent time of the time when time when electrode is anode and electrode are negative electrode prolongs and the surface temperature of electrode is risen, enlarge the temperature range of wishing, so be made as duty2＜duty2 ', t2＜t2 '.

In the example of Figure 15, the threshold value of modulating voltage Vla is to have only V1 1 point, and under a plurality of situations too, as long as the front and back of threshold value make a modulation frequency, duty ratio, during (time) change just passable.In addition, make step by step a modulation frequency, duty ratio, during variations such as (times), but also can it be changed continuously.

The pattern of lighting a lamp that makes the frequency change of lighting a lamp can be the whole of any 1 or two patterns of lighting a lamp, 3 patterns of lighting a lamp.

The pattern of lighting a lamp that makes change in duty cycle can be the 2nd light a lamp any of pattern of pattern or the 3rd of lighting a lamp.

The pattern of lighting a lamp that (time) changes during making both can be the 1st pattern of lighting a lamp, and also can be the 2nd light a lamp any of pattern of pattern or the 3rd of lighting a lamp, in a word, as long as during in 1 pattern of lighting a lamp, making at least (time) change just passable.In addition, the light a lamp order of pattern is not defined.

And then, about the magnitude relationship of the magnitude relationship of the frequency before and after the threshold value of modulating voltage, duty ratio, during (time) magnitude relationship, concrete frequency value, duty ratio value and during (time) also unqualified, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

(execution mode 8)

In the present embodiment, be characterised in that, in each of above-mentioned execution mode 1～6, make the 2nd and the 3rd pattern duty ratio and be not equal to 100%, with and/or make the 2nd with the 3rd pattern during different.Circuit structure can be identical with execution mode 1.

The action of present embodiment for example is that Figure 16 is such.As the pattern of lighting a lamp of high-pressure discharge lamp, 3 patterns of lighting a lamp shown in combination Figure 16 (a) shown in Figure 16 (b1)～Figure 16 (b3), are carried out 1 group of order of pattern 2 → pattern 1 → mode 3 → pattern 1 and with high voltage discharge lamp lighting repeatedly.In pattern 1, making a modulation frequency is f1, and duty ratio is 50%, during (time) be t1, making a modulation frequency in pattern 2, mode 3 is f2.

Duty in the

pattern

2,3 when during (time) for example be made as the following stated.

In the example of Figure 16 (b1), during pattern 2 and the mode 3 (time) equate (=t2), the duty ratio that is controlled to be pattern 2 and mode 3 is respectively 80%, 40%, make duty ratio with different with 100%.In this example, the sense of current of high-pressure discharge lamp is the ratio that the ratio of positive direction and negative direction added up to 60: 40.

In the example of Figure 16 (b2), make pattern 2 and mode 3 duty ratio and be 100% (sense of current of high-pressure discharge lamp is that the ratio of positive direction and negative direction is 50: 50), (time) during pattern 2 and the mode 3 is made as t2, t3 (t2＞t3) respectively.

In the example of Figure 16 (b3), make the pattern 2 and the duty ratio of mode 3 be respectively 80%, 40%, make duty ratio and different with 100% (sense of current of high-pressure discharge lamp is that the ratio of positive direction and negative direction is 60: 40), (time) during pattern 2 and the mode 3 is made as t2, t3 (t2＞t3) respectively.

Promptly, by Figure 16 (b1)～such control of Figure 16 (b3), because of the air-cooled condition of high-pressure discharge lamp La or in the Temperature Distribution of electrode A, B, produces under the situation of bias in that reflector R is installed on the high-pressure discharge lamp La as shown in Figure 17, set respectively value so that the temperature of electrode A, B becomes even.

The number repeatedly of the pattern of lighting a lamp and the magnitude relationship of order, the magnitude relationship of power and frequency, during the magnitude relationship of (time) be not limited to illustrative situation among Figure 16.In addition, some modulation frequency, duty ratio, during the concrete value of (time) do not limit, as long as it is just passable to be set at the value of the condition of lighting a lamp (power, air-cooled condition etc.) of high-pressure discharge lamp of the flicker (flicker) that is suitable for not taking place lamp.

(execution mode 8)

The high-pressure discharge lamp operation device of the respective embodiments described above is used to lighting a lamp as the high-pressure discharge lamp of the light source of projector.Figure 18 is the skeleton diagram of the internal structure of expression projector.In the drawings, the 31st, the light projector window, the 32nd, power supply unit, 33a, 33b, 33c are cooling fans, the 34th, the external signal input part, the 35th, optical system, the 36th, main control substrate, the 40th, discharge lamp ignition device, La are discharge lamps.In the frame that is illustrated by the broken lines, main control substrate is installed.In optical system 35 midway, be provided with the transmittance of the lamp of self discharge in the future La or the image-display units (transmission-type liquid crystal display element or reflection-type image-displaying member) of reflection, optical system 35 is set to, and will project on the screen through the transmitted light or the reverberation of this image-display units.Like this, discharge lamp ignition device 40 is installed in the inside of projector 30 with discharge lamp La.By adopting discharge lamp ignition device of the present invention, can reduce the flicker (flicker) of lamp, and can realize miniaturization, the cost degradation of ignition device.

In addition, also high-pressure discharge lamp operation device of the present invention can be applied to as back projection TV in projector and the incorporate image display device of screen.In addition, also high-pressure discharge lamp operation device of the present invention can be applied in general light source beyond the image display device, the ligthing paraphernalia that for example indoor or outdoors is used.

Claims

1. discharge lamp ignition device is characterized in that possessing:

The power of stipulating is supplied with in the power supply unit to high-pressure discharge lamp;

Make the unit of the alternating polarity counter-rotating of the electric current that high-pressure discharge lamp is supplied with; And

Control unit can change the frequency and the duty ratio that make the counter-rotating of this alternating polarity, this duty ratio be its positive polarity during with negative polarity during ratio,

After high-pressure discharge lamp begins to light a lamp, after high-pressure discharge lamp roughly reaches stable state or after reaching the modulating voltage of regulation, under the average power of the regulation that drops into to high-pressure discharge lamp, make high voltage discharge lamp lighting with at least 3 patterns of lighting a lamp,

In the above-mentioned pattern of lighting a lamp, during the positive polarity of the 1st pattern with negative polarity during about equally, during the positive polarity of the 2nd pattern than long during the negative polarity, during the positive polarity of the 3rd pattern than short during the negative polarity,

Be more than at least 1 cycle during each pattern, with the 1st pattern, the 2nd pattern, the 3rd pattern at least each 1 pattern carry out this 1 group repeatedly as 1 group.

2. high-pressure discharge lamp operation device as claimed in claim 1 is characterized in that,

The point modulation frequency of the 2nd pattern and the 3rd pattern is that the point of the 1st pattern is below the modulation frequency.

3. high-pressure discharge lamp operation device as claimed in claim 1 is characterized in that,

The point modulation frequency height of frequency ratio the 1st pattern of lighting a lamp at least one pattern of the 2nd pattern and the 3rd pattern.

4. as each described high-pressure discharge lamp operation device in the claim 1～3, it is characterized in that,

Changing under the situation of the power that high-pressure discharge lamp drops into variation point modulation frequency at least 1 pattern in each pattern.

5. as each described high-pressure discharge lamp operation device in the claim 1～3, it is characterized in that,

Under the situation of the power that high-pressure discharge lamp drops into, change duty ratio at least 1 pattern in the 2nd pattern or the 3rd pattern in change.

6. as each described high-pressure discharge lamp operation device in the claim 1～3, it is characterized in that,

In change under the situation of the power that high-pressure discharge lamp drops into, at least 1 pattern in each pattern this pattern of change during.

7. as each described high-pressure discharge lamp operation device in the claim 1～3, it is characterized in that,

Changing under the situation of the power that high-pressure discharge lamp drops into, some modulation frequency in each pattern, duty ratio, during project in change two projects at least, the project of change be under the situation of a modulation frequency in the 1st pattern～the 3rd pattern, be each value of change at least 1 pattern in the 1st pattern～the 3rd pattern under the situation in the 2nd pattern or the 3rd pattern, during being under the situation of duty ratio.

8. as each described high-pressure discharge lamp operation device in the claim 1～3, it is characterized in that,

Modulating voltage according to high-pressure discharge lamp, some modulation frequency in each pattern, duty ratio, during project in change 1 project at least, the project of change be under the situation of a modulation frequency in the 1st pattern～the 3rd pattern, be each value of change at least 1 pattern in the 1st pattern～the 3rd pattern under the situation in the 2nd pattern or the 3rd pattern, during being under the situation of duty ratio.

9. as each described high-pressure discharge lamp operation device in the claim 1～3, it is characterized in that,

Make the 2nd pattern and the 3rd pattern duty ratio and be not equal to 100%, with and/or make during the 2nd pattern and the 3rd pattern different.

10. an image display device is characterized in that,

Possess as each described high-pressure discharge lamp operation device in the claim 1～3.