WO2017094483A1 - ガス放電を利用した光源デバイスの駆動方法及び駆動回路と紫外線照射装置 - Google Patents
ガス放電を利用した光源デバイスの駆動方法及び駆動回路と紫外線照射装置 Download PDFInfo
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Images
Classifications
-
- 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
- H05B41/282—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
- H05B41/2825—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 by means of a bridge converter in the final stage
- H05B41/2828—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 by means of a bridge converter in the final stage using control circuits for the switching elements
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21K—TECHNIQUES FOR HANDLING PARTICLES OR IONISING RADIATION NOT OTHERWISE PROVIDED FOR; IRRADIATION DEVICES; GAMMA RAY OR X-RAY MICROSCOPES
- G21K5/00—Irradiation devices
- G21K5/02—Irradiation devices having no beam-forming means
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/04—Electrodes; Screens; Shields
- H01J61/06—Main electrodes
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/02—Details
- H01J61/30—Vessels; Containers
- H01J61/305—Flat vessels or containers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J61/00—Gas-discharge or vapour-discharge lamps
- H01J61/92—Lamps with more than one main discharge path
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
- H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
- H01J65/042—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field
- H01J65/046—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels by an external electromagnetic field the field being produced by using capacitive means around the vessel
-
- 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
- H05B41/24—Circuit arrangements in which the lamp is fed by high frequency ac, or with separate oscillator frequency
Definitions
- the present invention relates to a driving method of a light source device using gas discharge, a driving circuit thereof, and an ultraviolet irradiation device. More specifically, the present invention relates to a driving method and a driving circuit for optimally driving a surface light source discharge device, particularly an ultraviolet light emitting surface light source device configured by arranging a plurality of ultraviolet light emitting gas discharge tubes in parallel.
- high-pressure mercury lamps and excimer discharge lamps are well known as light source devices using gas discharge.
- an ultraviolet light source a gas discharge device using an ultraviolet light emitting phosphor is known (for example, see Patent Document 1).
- An external electrode type gas discharge device having a narrow tube configuration suitable for the configuration of a surface light source is also well known (see, for example, Patent Documents 2 and 3).
- Japanese Patent No. 5074381 Japanese Patent Laid-Open No. 2004-170074 Japanese Patent Laid-Open No. 2011-040271
- the present invention provides a new driving method for optimally driving a gas discharge device for a light source, in particular an ultraviolet light source (see Japanese Patent Application No. 2015-099146) previously invented by the present inventors to solve the above-mentioned problems. And its drive circuit and ultraviolet irradiation device.
- the gas discharge device for a light source which is the subject of the present invention is driven by a sine wave alternating (AC) voltage
- its frequency characteristics and voltage characteristics are not always constant, and subtle variations and operations for each discharge tube Changes in characteristics over time are unavoidable.
- the capacity of the discharge device serving as a load differs greatly at the start of initial lighting (discharge) and after the start of discharge, and deterioration of the light emission intensity with time is unavoidable. Accordingly, it is an object of the present invention to provide a driving method and a driving circuit in which driving conditions are optimized in response to variations and changes in characteristics of a discharge device to be driven, thereby obtaining stable light emission characteristics over a long period of time. It is.
- the present invention relates to an alternating drive voltage applied between a pair of electrodes provided facing the outer surface of the bottom of the envelope constituting the light source gas discharge device, and a voltage Vo at the start of initial lighting (discharge).
- the main point is that driving is performed by switching to a lower voltage Vs during steady discharge operation.
- a buffer period having a voltage rising process of several cycles is provided before the lighting (discharge) start voltage Vo is applied, and the lighting period (writing period) at the lighting (discharge) start voltage Vo is further provided. Thereafter, a three-stage initial drive sequence with a constant voltage stabilization period is adopted, and then a steady lighting (discharge) operation at the sustain voltage Vs is performed.
- the gas discharge device for the light source to be driven is of the external discharge type, and alternately accumulates in response to the polarity inversion of the alternating drive voltage in the electrode corresponding portion of the inner wall of the glass envelope constituting the device after lighting. This is possible by using the wall charge.
- the switching of the drive voltage from Vo to Vs and the adjustment of the alternating voltage in the initial drive sequence are performed by switching the input DC voltage (DC) to the inverter circuit as the drive power supply, or a signal for controlling the switch operation of the inverter circuit. This can be done by changing the duty ratio and controlling the current value supplied to the primary winding of the step-up transformer.
- DC DC voltage
- the present invention also sweeps the drive frequency of the drive voltage supplied to the gas discharge device for light source from the step-up transformer of the inverter power source constituting the drive circuit at the start of initial lighting (discharge) within a certain sweep width, It is characterized by a driving method in which a discharge voltage and a discharge current are detected and automatically tuned to an optimum frequency.
- the drive circuit of the present invention automatically adjusts the output voltage and the drive frequency based on the detected values of the discharge voltage and discharge current in the DC-AC inverter power supply circuit for driving the external electrode gas discharge device for the light source.
- An automatic frequency control circuit is provided.
- This automatic frequency control circuit automatically adjusts the drive frequency to the resonance frequency of the resonance circuit determined by the gas discharge device that becomes the capacitive load and the output inductance of the step-up transformer included in the inverter power supply circuit.
- the frequency within the predetermined width is swept with a sine wave of the peak voltage V1
- the optimum drive frequency is set by control by feedback of the discharge voltage and discharge current during that time.
- the tuning of the optimum driving frequency is performed every time the lamp is turned on, and after the tuning is finished, control is performed to switch the driving voltage Vo to a level Vs that is one step lower.
- Such a voltage switching function is also incorporated in the control circuit.
- a driving method in which an alternating driving voltage is intermittently applied at a predetermined burst period is used.
- the light emission intensity can be adjusted by changing the duty ratio between the application time of the drive voltage and the pause time while keeping the burst period constant.
- the emission intensity can be adjusted by changing the burst period while keeping the duty ratio constant.
- a high drive voltage exceeding the discharge start voltage Vf is applied only to the start of initial lighting to a light source device composed of an external electrode type gas discharge device to be driven, and thereafter steady light emission is performed at a low drive voltage. Since the operation is performed, the effect of extending the operation life of the gas discharge device and the effect of reducing the power consumption can be obtained as compared with the case of steady driving by continuously applying a high driving voltage at the start of lighting.
- the characteristics of the gas discharge device or the ultraviolet light source device to be driven since optimum driving conditions are set for each lighting, the characteristics of the gas discharge device or the ultraviolet light source device to be driven, environmental changes, and changes in characteristics over time are also followed. Thus, a stable light emission output can always be obtained.
- a light emission intensity adjustment function is added to a drive circuit associated with a light source device using a gas discharge device, thereby compensating for a decrease in light emission intensity due to deterioration of the light source device.
- a stable light output can be obtained over a long period of time.
- the application field can be expanded.
- FIG. 2 is an electrode connection diagram and an equivalent circuit diagram of the light source device shown in FIG. 1. It is the schematic diagram which showed the discharge model of the ultraviolet light emission gas discharge tube shown in FIG. 1 in time series.
- FIG. 1 is a block diagram illustrating a drive circuit according to a first embodiment of the present invention. It is a block which shows the structure of the frequency automatic adjustment control circuit shown in FIG. It is a diagram which shows the frequency characteristic of the light source device shown in FIG. It is a diagram which shows the change of the relative detection signal corresponding to each of the drive voltage and drive current accompanying the change of the drive frequency in 1st Embodiment. It is a flowchart explaining the operation
- 5 is a time chart specifically showing an operation sequence at the start of initial lighting. It is a block diagram which shows the structural example of the light emission intensity control circuit in an alternating drive voltage control part. 5 is an im chart showing a first operation example for adjusting the emission intensity. 6 is a time chart showing a second operation example for adjusting the emission intensity. It is a time chart which shows the relationship between the drive waveform of a light source device, and a light emission waveform.
- symbol is attached
- the discharge electrode with respect to the gas discharge device for light sources used as a drive object may be called a "long electrode" for convenience, the length of an electrode is not limitedly expressed.
- FIG. 1 shows, as a first embodiment of the present invention, a basic configuration of a gas discharge device for ultraviolet light emission having a tube form, and a surface emission type configured by arranging a plurality of gas discharge tubes for ultraviolet light emission. It is explanatory drawing for demonstrating the basic composition of a light source device.
- FIG. 1A is a cross-sectional view of an ultraviolet light emission gas discharge tube.
- an ultraviolet light emission gas discharge tube (hereinafter referred to as a light emitting tube) 1 is mainly composed of an elongated glass tube 2 having a flat elliptical cross section serving as an envelope, and its inner bottom surface.
- a discharge gas in which neon and xenon are mixed is sealed inside to seal both ends.
- the glass tube 2 is a thin tube having a flat elliptical cross section having a major axis of 2 mm and a minor axis of about 1 mm, for example, made of an inexpensive borosilicate glass mainly composed of silicon oxide (SiO 2 ) and boron oxide (B 2 O 3 ).
- the wall thickness is limited to 300 ⁇ m or less to achieve a sufficient transmittance for UV-B and UV-C wavelength regions.
- quartz having excellent ultraviolet transmittance may be used as the material of the glass tube 2.
- the ultraviolet phosphor layer 3 when a gadolinium activated phosphor (LaMgAl11O19: Gd) is used, it is possible to obtain 311 nm ultraviolet light emission that is an effective UV-B band wavelength range for industrial and medical use. .
- a praseodymium-activated phosphor YBO 3 : Pr or Y 2 SiO 5 : Pr
- ultraviolet light having a wavelength of 261 nm or 270 nm in the UV-C band wavelength range having a bactericidal / sterilizing effect can be obtained.
- VUV vacuum ultraviolet rays
- FIG. 1B is a perspective view of the surface-emitting light source device 4 of this embodiment.
- a light emitting tube 1 mainly composed of a glass tube 2 shown in FIG. 1A is arranged in parallel in a direction intersecting with the longitudinal direction of the light emitting tube 1 as shown in FIG. Device 4 is created.
- each light-emitting tube 1 constituting the light-emitting tube array structure 10 in FIG. 1B has a thin heat-resistant (several tens of ⁇ m) insulating film 11. It is arranged in an adhesive state that can be removed by an adhesive 12 having good thermal conductivity such as a silicone resin. In order to allow the light source device 4 to bend between adjacent light emitting tubes 1, gaps having the same width dimension or partially different width dimensions are provided.
- an electrode structure 15 including a flexible insulating substrate 13 made of polyimide resin and an electrode pair 14 formed thereon is provided in an adhesive (non-adhesive) state.
- the electrode pair 14 is composed of a strip-shaped X electrode 14X and a Y electrode 14Y that are opposed to the bottom rear surface of each light emitting tube 1 constituting the light emitting tube array structure 10 and spread on both sides with a common electrode slit G interposed therebetween.
- the X electrode 14X and the Y electrode 14Y as a whole have a common electrode pattern extending in a direction crossing the longitudinal direction of each light emitting tube, but for each individual light emitting tube 1, an initial discharge is generated in the tube. And a pair of long electrodes extending symmetrically on both sides in the longitudinal direction with an electrode slit G of about 0.1 to 10 mm.
- the length in the tube longitudinal direction of the X electrode 14X and the Y electrode 14Y is 5 to 10 times the width of the electrode slit G or more.
- the light emitting tube 1 is composed of 5 cm long glass capillaries having a flat elliptical cross section having a major axis of 2 mm and a minor axis of 1 mm, and 20 such tubes are arranged at intervals of 1 mm to emit light as shown in FIG.
- the X electrode 14X and the Y electrode 14Y are provided on both sides of the discharge slit G having a width of 3 mm in a pattern extending in a direction intersecting with each light emitting tube 1 with a width of 23.5 mm. It is done.
- the electrode coverage with respect to the light emitting area corresponds to 94%.
- the X electrode 14X and the Y electrode 14Y may be formed directly by printing a conductive ink such as silver paste on the insulating substrate 13, or a preliminarily shaped metal conductor foil such as copper or aluminum is adhered or bonded. May be configured.
- a conductive ink such as silver paste
- a preliminarily shaped metal conductor foil such as copper or aluminum is adhered or bonded. May be configured.
- an electrode pair can be formed by patterning a conductor layer formed on the insulating substrate 13.
- a fluorine-based transparent resin such as Teflon (registered trademark) is used as the insulating film 11 that supports the luminous tubes 1 in an array
- a material having high light reflectance is preferable for the X and Y electrodes 14X and 14Y. Then, it is particularly effective to use aluminum foil.
- the electrode slit G becomes a window opened downward, there is a possibility that ultraviolet light emission may escape to the back, so that the corresponding part of the electrode slit G is an insulating material having an optical refraction factor equivalent to that of the electrode material, such as a reflective tape. It is preferable to close with.
- the gas discharge light emitting tube 1 may be disposed by providing an adhesive insulating layer such as silicone resin directly on the insulating substrate 13 on which the X electrode 14X and the Y electrode 14Y are formed. Since the light emitting tube array structure 10 and the electrode structure 15 are not bonded, a tensile force applied to the insulating substrate 13 when the flexible surface light source device is bent can be absorbed.
- an adhesive insulating layer such as silicone resin directly on the insulating substrate 13 on which the X electrode 14X and the Y electrode 14Y are formed. Since the light emitting tube array structure 10 and the electrode structure 15 are not bonded, a tensile force applied to the insulating substrate 13 when the flexible surface light source device is bent can be absorbed.
- FIG. 2 (a), (b), (c), (d), and (e) are a longitudinal sectional view and a rear view showing a specific configuration example of the light source device 4 of this embodiment.
- a plurality of luminous tubes 1 are parallel to each other on the upper surface of a polyimide insulating film 11 having a pattern of X electrodes 14X and Y electrodes 14Y of copper or aluminum foil formed on the lower surface. It is arranged to be removable with a heat conductive adhesive such as resin.
- a film-like flexible surface light source device is completed by covering the back surfaces of the electrode pairs 14X and 14Y with a heat-resistant insulating film 16a.
- an insulating back support substrate 16b such as glass, ceramic or resin is attached to the back of the film-like light source device of FIG. 2 (a).
- a hard flat light source device that follows the shape of the substrate surface is completed.
- a heat dissipation substrate 16c as shown in FIG. 2C may be provided in place of the back support substrate 16b.
- the heat dissipation board 16c is made of resin, glass, or the like provided with a number of metal (for example, copper) through-holes 19 in the plane so as not to impair the strength.
- An insulating base material 20 such as ceramic is used as a base, and heat radiation metal (for example, copper) pattern layers 21 and 22 having substantially the same pattern as the electrode patterns 14X and 14Y are provided on both surfaces thereof.
- the metal patterns 21 and 22 for heat dissipation can be divided into islands as shown in FIG. 2 (e) corresponding to the through holes in order to prevent the high voltage due to capacitive coupling with the electrodes 14X and 14Y. .
- the surface light source device to be driven of the present invention may have a panel configuration in addition to a tube array configuration in which a plurality of the light emitting tubes 1 are arranged as described above.
- 3A is a plan view for explaining the surface light source device 40 having such a panel configuration
- FIGS. 3B and 3C are sectional views taken along arrows AA and BB in FIG. It is.
- the configuration of the surface light source device 40 is substantially the same as the configuration in which the light emitting tube array structure 10 shown in FIG. 1B is replaced with one panel envelope 100.
- the panel envelope 100 includes a front substrate 101 and a rear substrate 102, and a sealed gas filled space 103 is formed between them.
- the gas space 103 is partitioned into a plurality of stripe-shaped discharge channels by spacers 104 such as glass rods, and the periphery is sealed through similar glass rods.
- an exhaust pipe 105 is provided so as to communicate with a common space corresponding to a trigger discharge gap (electrode slit) G that crosses the central dividing portion of the rod-shaped spacer 104.
- the front substrate 101 is made of a quartz glass plate or a heat-resistant micro glass sheet having a thickness of 300 ⁇ m or less that does not interfere with the transmission of ultraviolet rays.
- the back substrate 102 is also made of quartz glass or heat-resistant microsheet glass, electrode pairs 106X and 106Y are disposed on the back surface side, and an ultraviolet phosphor layer (not shown) is formed on the inner surface.
- a glass or ceramic support substrate 108 is attached to the back side of the back substrate 102 with an adhesive having good thermal conductivity so as to sandwich the electrode pairs 106X and 106Y.
- the electrode pairs 106X and 106Y may be formed on the support substrate 108.
- the support substrate 108 serves not only to support the glass panel envelope 100 composed of the thin front substrate 101 and the rear substrate 102 but also to serve as an electrode substrate and a heat sink.
- the back surface of the support substrate 108 may be lined with a metal sheet such as copper or aluminum in the same manner as the heat dissipation substrate 16C in the light source device having the light emitting tube array configuration shown in FIG.
- the electrode pairs 106X and 106Y do not necessarily have the common solid pattern as shown in the figure, and correspond to the striped gas discharge channels partitioned by the spacers 104 in the respective longitudinal directions. You may form as an extended stripe pattern.
- FIG. 4A is a schematic plan view of the light source device 4 having a light emitting tube array configuration.
- the light source device 4 having the light emitting tube array configuration or the surface light source device 40 having the panel configuration are both external electrode types and are basically driven by a sine wave voltage. That is, with a light source device 4 having a tube array configuration as a representative example, a sinusoidal voltage is applied to the other Y electrode 14Y while the common X electrode 14X is grounded to the plurality of light emitting tubes 1 as shown in FIG.
- the drive power supply 17 is connected to apply.
- FIG. 4 (b) shows an equivalent circuit of the light source device 4 shown in FIG. 4 (a).
- the equivalent circuit of the surface light source device 40 having the panel configuration shown in FIG. 3 is not substantially changed.
- the electrical circuit elements of the luminous tube 1 are represented by the discharge switches PS, the internal resistance R, and the capacitances Cwx and Cwy of the insulating film 11 including the glass tube 2 (FIG. 1 (a)).
- interelectrode capacitance Cp of the X and Y electrodes 14X and 14Y enters in parallel with the circuit elements of the luminous tube 1, and further, parasitic capacitances Csx and Csy are interposed between these electrodes and the ground. It has become.
- a drive power supply 17 that outputs a high voltage of a sine wave is connected to the electrode terminals TX and TY. Note that there is a leakage path RP having a high impedance between the terminals TX and TY so that it can be regarded as an almost open state.
- the light source device 4 is a capacitive load
- the drive power supply 17 is composed of an inverter power supply
- the inductance of the output winding of the step-up transformer is connected in parallel to the drive terminals TX and TY of the light source device 4.
- a parallel resonant circuit is formed as a whole. Therefore, it is preferable to drive the light source device 4 at a resonance frequency including the power supply circuit.
- the frequency of the sinusoidal drive voltage is lit between 20 kHz and 50 kHz determined in advance from the relationship between the total load capacity and the output inductance of the inverter power supply in the equivalent circuit of FIG. Sometimes it is swept and set to a resonant frequency of, for example, 25 kHz.
- the peak voltage at the time of initial lighting is 1000 V or higher, which is higher than the discharge start voltage in the gas space corresponding to the electrode slit G (FIG. 4 (a)), but the discharge on the electrodes 14X and 14Y. It is determined in consideration of the balance between the spreading length and the prevention of damage due to discharge exceeding the breakdown voltage of the electrode slit G.
- FIG. 5 is a schematic diagram showing a discharge model of the light emitting tube 1 as an object of the present invention in time series.
- a sine wave voltage shown in FIG. 5A is applied to the long electrodes 14X and 14Y.
- the voltage v1 in the rising process of the sine wave voltage shown in FIG. 5A exceeds the discharge start voltage Vf of the discharge space CS corresponding to the electrode slit G between the long electrodes 14X and 14Y at the timing t1
- the response Trigger discharge TD occurs at the part.
- This trigger discharge TD supplies a large amount of space charge to the nearby gas space, which causes a so-called fire effect and expands the discharge in the longitudinal direction of the long electrodes 14X and 14Y as the voltage of the sine wave rises. It will shift to distance discharge.
- the trigger discharge TD generated at the corresponding portion of the electrode slit G at the timing t1 extends in the extending direction of the long electrodes 14X and 14Y while accumulating wall charges in the process of increasing the applied voltage following the timings t2 and t3. You can see how it expands along.
- the drive circuit in this embodiment is shown in FIG.
- This drive circuit has a configuration of an inverter power source connected to a light source device 4 having a representative arrangement of a plurality of luminous tubes 1. That is, the secondary winding L2 of the step-up transformer 20 is connected to the light source device 4, and switching transistors Tr1 and Tr2 for converting the DC voltage from the power supply input switching circuit 21 into the AC voltage are connected to the primary winding L1. It is connected. Further, as in a normal inverter power supply circuit, capacitors C, C1, C2, and a resistor R1 are appropriately connected as illustrated.
- the on / off control of the switching transistors Tr1 and Tr2 for determining the driving frequency is performed by frequency control signals S1 and S2 given from the automatic frequency control circuit 22 to the switch control circuit 23.
- the frequency automatic control circuit 22 is fed back with the drive voltage detection signal VDs and the drive current detection signal IDs as control signals from the output side of the step-up transformer 20. Further, the automatic frequency control circuit 22 supplies a power supply switching signal DS to the power supply input switching circuit 21.
- the automatic frequency control circuit 22 mainly includes a frequency control signal generation unit 24 including a voltage control transmission circuit (VCO) and a sequence selection control unit 25.
- the sequence selection control unit 25 receives the drive voltage detection signal VDs as an input to determine the voltage at resonance, the current determination circuit 27 to determine the current at resonance by receiving the drive current detection signal IDs, and both signals.
- a power determination circuit 28 that determines power at resonance from VDs and IDs is connected.
- the sequence selection control unit 25 receives the output from them and generates a control signal for the frequency control signal generation unit 24 and a control signal DS for the power input switching circuit 21.
- FIG. 8 is a diagram showing typical frequency characteristics of the light source device 4 connected to the drive circuit having the inverter power supply configuration of FIG.
- the characteristic curve VP1 at the peak of the electrode gap G exceeding the discharge start voltage Vf and the characteristic curve VP2 at the peak voltage exceeding the sustain voltage Vs lower than Vf due to the effect of the wall voltage are shown superimposed, and the frequency on the horizontal axis is shown.
- Weak resonance points fr1 and fr2 corresponding to the harmonics of the resonance frequency fr0 also appear at frequencies higher than the frequency of the resonance point fr0.
- the resonance frequency f0 can be selected by roughly predicting the resonance point and sweeping the upper and lower frequencies in the range of f1 to f2.
- FIG. 9 is a graph for explaining the principle of operation for selecting the resonance frequency, and shows changes in the drive voltage detection signal VDs and the drive current detection signal IDs relative to the sweep of the drive signal frequency F on the horizontal axis in relative values. Yes.
- the drive current detection signal IDs tends to increase, but a region where current loss decreases at a certain frequency appears. Further, although the drive voltage detection signal VDs tends to decrease as the frequency F increases, a region where the drive voltage detection signal VDs increases at a certain frequency appears.
- the drive signal frequency F when the drive signal frequency F is increased from the bottom, a voltage change and a current change occur according to the frequency characteristics determined from the inductance component of the step-up transformer 20, the interelectrode capacitance of the light source device, the stray capacitance, and the like.
- the current tends to increase, but there is a frequency at which the current loss decreases.
- the amplitude voltage tends to decrease at a high frequency, but has a characteristic having a peak increasing at a specific frequency.
- the drive circuit sequence selection control unit 25 (FIG. 7) includes a predicted resonance frequency predicted from a rough load capacity of the light source device 4 and a leakage inductance of the secondary winding L2 of the step-up transformer 20, and a predicted resonance of, for example, 25 kHz.
- a sweep condition such as a frequency sweep width in the range of about 10 kHz above and below the frequency is set as an initial condition in advance (step 1).
- the DC power of the voltage V1 (for example, 12V) is first turned on (step 2), and the operation preset in the sequence selection control unit 25 in FIG.
- the basic clock signal F0 whose frequency is variable from the VCO included in the frequency control signal generator 24 (FIG. 7) is preset from a frequency below the resonance point, for example, a predetermined sweep width shown in FIG. Is transmitted so as to sweep the range SB (step 3).
- the change in the period T0 accompanying the frequency sweep of the basic clock signal F0 is not shown.
- the sequence selection control unit 25 (FIG. 7) similarly generates a burst signal B0 having a duty ratio of 3: 2 and a frequency of about 100 to 1000 Hz as shown in FIG. 11, and the basic clock signal F0 is a clock that is temporarily interrupted in a burst cycle. Converted to signal F1.
- the frequency control signals S1 and S2 having different phases of the pulse width TSa are generated at the rising and falling timings of the clock signal F1. Both frequency control signals S1 and S2 are applied to the gate electrodes of the transistors Tr1 and Tr2 via the switch control circuit 23 (FIG. 6), and the on / off states of both elements are alternately switched.
- the burst frequency of the drive voltage Vout for the light source device 4 is 100 Hz, the time of one cycle is 10 ms, and if the duty is 3: 2, the application time of the drive voltage in one burst cycle is 6 ms. Therefore, for example, during the drive voltage application period (burst length) in the first burst cycle, a sweep signal for sweeping the transmission frequency is supplied from the sequence control circuit 25 to the VCO included in the frequency control signal generator 24 (FIG. 7). .
- the period T0 of the frequency variable basic clock signal F0 changes, and the frequency of the drive voltage Vout is also swept accordingly.
- the sweep operation for this resonance point search is not limited to the first cycle of the burst signal B0, but may be performed over a plurality of cycles.
- step 4 a detection operation of a change in voltage and current due to the discharge operation of the light source device 4 is started (step 4).
- step 5 the peak value of the change in the detection signals VDs and IDs and the corresponding drive frequency are determined (step 5).
- the determination signal of the determination circuit is fed back to the sequence selection control unit 25 (FIG. 7), and the VCO of the frequency control signal generation unit 24 is controlled so that the frequency determined by the determination circuit is fixed as the selection frequency (step 6). ).
- the power source input switching signal DS is sent from the sequence selection control unit 25 (FIG. 7) of the automatic frequency adjustment control circuit 22 to the power source input switching circuit 21 (FIG. 6). Is output.
- the power source is switched from a DC power source (battery) having a voltage V1 (for example, 12V) to a DC power source (battery) having a lower voltage V2 (for example, 6V) by the switching signal DS.
- V1 for example, 12V
- V2 for example, 6V
- the drive voltage Vout appearing on the output side of the step-up transformer 20 is also lowered from the voltage Vout1 at the start of lighting to Vout2, and a steady lighting state is set (steps 7 and 8).
- the light emitting tube 1 serving as the light emitting unit of the light source device 4 has the external electrode type configuration as described above, after the discharge is once started at a voltage exceeding the discharge start voltage Vf, the inner wall surface of the tube Due to the action of wall charges accumulated in the discharge, the discharge can be maintained at a voltage Vs lower than the discharge start voltage.
- reliable lighting driving is performed at a high voltage at the start of lighting, but driving is performed by reducing the peak value of the driving voltage to about half during subsequent steady lighting.
- an output voltage V1 with a drive voltage Vout boosted by the step-up transformer 20 sufficient to start the discharge of the light source device 4, for example, a peak value of about 2000V is used.
- the DC power supply is switched to that of the output voltage V2 so that the peak value of the boosted output voltage is about 1000V.
- This voltage switching is more advantageous than adjusting the voltage on the output side of the step-up transformer 20.
- the voltage during steady driving is driven to a voltage level that can maintain discharge, so that stable driving is possible. Further, since the wall charges accumulated in the tube wall are sufficiently retained for several hours even when the drive voltage is cut off, the discharge can be restarted instantaneously by reapplying the sustain voltage.
- the driving voltage Vs during the steady lighting operation is a voltage that can maintain the discharge by using the wall charges, but the length of the electrode is used to extend the discharge to both sides of the electrodes 14X and 14Y in the tube axis direction. It is decided according to. Therefore, when the electrode length is long, the peak value of the sustain voltage Vs is not necessarily set to be equal to or lower than the discharge start voltage Vf between the adjacent end portions (discharge gap portion G) of the electrode pair.
- the length of the effective light emitting region that can be covered by one electrode pair is determined from the relationship between the breakdown voltage of the discharge gap and the peak value of the driving voltage. In order to lengthen the effective light emitting region while suppressing the driving voltage, it is possible to adopt a configuration in which a plurality of pairs of electrodes are arranged in the longitudinal direction of the arc tube.
- FIG. 12 is a view corresponding to FIG. 6 showing a drive circuit of the light source device 4 or the surface light source device 40 according to the second embodiment of the present invention.
- the feature of this embodiment is that the drive voltage reduction after the initial lighting operation is performed by controlling the primary current amount for the step-up transformer 20 instead of the DC power source switching method of the first embodiment. .
- the amplitude switching control unit 29 After the end of the initial lighting operation period preset in the sequence selection control unit 25 (FIG. 7), the amplitude switching control unit 29 sends the duty ratio control signals of the frequency control signals S1 and S2 to the frequency control signal generation unit 24. put out.
- the pulse widths of the frequency control signals S1 and S2 are narrowed from TSa to TSb as shown in the waveform time chart of each part of the second embodiment shown in FIG. It is changed from / T0 to TSb / T0.
- the conduction time in the ON state of the switching transistors TR1 and TR2 that are ON / OFF controlled by the frequency control signals S1 and S2 is shortened, and the current flowing through the primary winding L1 of the step-up transformer 20 decreases according to the pulse width.
- the amplitude value of the sine wave voltage obtained on the output side of the step-up transformer 20 is reduced from Vout1 to Vout2.
- FIG. 14 (a) is an envelope waveform diagram showing an initial drive sequence for avoiding the problem at the time of the initial lighting start operation as described above and stably starting.
- the initial lighting start period IDP has a three-stage sequence of a buffer period DP, a writing period FP, and a stabilization period SP.
- the buffer period DP the voltage of the sine wave applied from the output transformer of the power supply gradually increases and is raised to Vo exceeding the discharge start voltage Vf between the discharge gaps G.
- the write period FP of several cycles at the voltage level Vo is executed, and the initial discharge is started between the electrode pairs 14X and 14Y.
- a change pattern of the sine wave voltage waveform during this period is shown in FIG.
- a stabilization period SP in which a sine wave having a stabilization voltage Vso lower than the discharge start voltage Vf is applied is provided to stabilize the initial discharge accompanied by the generation of wall charges. Then, after the initial lighting drive sequence is executed in these three stages, the operation in the steady discharge mode NDM is performed.
- a sustain discharge operation using wall charges is performed by intermittently applying a sine wave of a sustain voltage VS lower than the voltage Vo at the time of initial lighting in a predetermined burst cycle.
- the emission intensity can be adjusted by adjusting the burst period of the drive voltage applied intermittently or the duty ratio of the application time.
- FIG. 15 is a configuration example of a light source device driving circuit for driving the third embodiment including the initial lighting sequence as described above.
- FIG. 16 shows a time chart of operation waveforms of each part for explaining the operation of the drive circuit.
- the circuit is roughly divided into an alternating drive voltage generator 200 and an alternating drive voltage controller 300 surrounded by a broken line.
- the configuration of the alternating drive voltage generator 200 has a so-called inverter power supply configuration, which is not substantially different from the circuit configuration shown in FIG.
- the alternating drive voltage control unit 300 includes a frequency / amplitude control circuit 310 and a light emission intensity control circuit 320.
- the frequency / amplitude control circuit 310 counts the number of clocks corresponding to the initial burst period Tbc-1 from the main clock signal in a preset sequence in addition to the circuit for generating the main clock signal FO shown in FIG.
- the frequency adjustment trimmer 311 that includes a control circuit that generates switch controls S1 and S2 having a predetermined duty ratio and that can adjust the drive frequency from the outside is provided.
- the duty ratio that is, the pulse of the switch control signals S1 and S2 generated at the rising and falling timings of the main clock signal F0.
- the width is changed as shown in FIG. 16 by the control of the sequencer.
- the sine wave amplitude value of the output drive voltage from the step-up transformer 20 is shown as Vout in FIG. 16 on the same operating principle as the switching from the drive voltage Vout1 to Vout2 described above with reference to FIGS.
- it can be changed in three stages: a buffer period DP, a write period FP, and a stabilization period SP.
- the initial burst period Tbc-1 is set to a length equivalent to about 5 times the burst period during steady driving of 100 to 1000 Hz, and the burst length Tb-1 for executing the three-stage initial driving sequence has a duty ratio of 50% to More than that. That is, the initial burst period Tbc-1 is about 50 ms, and the burst length Tb-1 is 25 ms or more.
- the light emission intensity control circuit 320 has a configuration as shown in FIG. 17, for example, and adjusts the light emission intensity by controlling the burst control signal B0 that determines the application period or application time of the drive voltage during steady lighting. Function.
- the number of times of discharge light emission per unit time can be increased or decreased by changing the burst time length Tb and the immediate duty ratio while keeping the drive voltage application period, that is, the burst period Tbc constant, and as a result, the light emission intensity changes.
- the burst cycle Tbc with a constant duty ratio, the number of times of discharge light emission per unit time changes, and the light emission intensity can be adjusted.
- FIG. 18 is a time chart for explaining the operation when the light emission intensity is adjusted by changing the duty ratio while keeping the burst period Tbc constant.
- FIG. 19 is a time chart for explaining the operation when the burst cycle Tbc is changed while the duty ratio is constant.
- the analog intensity signal from the emission intensity adjusting means 321 is converted into a digital intensity signal by the A / D conversion circuit 322, and the 1 burst period count numerical value recording table 323 is obtained. And 1 burst length count numerical value recording table 324.
- a count value corresponding to a predetermined burst cycle and a burst length count value corresponding to the intensity signal are read and set in the burst cycle count circuit 325 and the burst length count circuit 326, respectively.
- a burst control signal B0 is generated from the burst period signal Tbc and the burst length signal Tb, and is supplied to the switch control circuit 23 of the drive voltage generator as a light emission intensity control signal.
- the 1 burst cycle count numerical value recording table 323 and the 1 burst length count numerical value record table 324 include the initial burst cycle time for executing the initial discharge start operation sequence and the three stages of drive voltage change times.
- the count value to be set is also stored.
- the initial burst period Tbc-1 and the initial burst length Tb-1 described in FIG. 16 are determined by a control signal from a sequencer (not shown) included in the frequency / amplitude control circuit 310.
- FIG. 20 shows the relationship between the drive voltage waveform (a) and the light emission waveform (b) when the present invention performs burst drive as described above.
- a sine wave having a period of 25 ⁇ s (driving frequency 40 KHz) optimized by the method as in the second embodiment is shown in FIG. 20 with a duty ratio corresponding to a predetermined light emission intensity.
- pulse light emission as shown in FIG. 20B corresponding to the period of the applied sine wave is performed, and light emission intensity corresponding to the integrated value is obtained.
- the ratio (Tb / Tbc) of the burst length Tb to the burst period Tbc of the drive voltage application that is, the duty ratio corresponds to the light emission intensity in a substantially linear relationship.
- Driving with a duty ratio of 100% means that a driving voltage is continuously applied, and the maximum emission intensity can be obtained.
- the burst length Tb is preferably set so that the period of the driving sine wave is at least 5 cycles or more in one burst period Tbc.
- the burst frequency can be arbitrarily set within the range of 100 to 1000 Hz, and the duty ratio can be set within the range of 10 to 90%, and the light emission intensity is adjusted by adjusting the burst period or duty ratio within the range. If the frequency of the driving sine wave is 40 KHz and the burst frequency is 1000 Hz, the number of sine waves in one burst length is 20 cycles with a duty ratio of 50%, and 40 discharges and accompanying light emission occur.
- the optimum condition for the drive voltage is not necessarily at the resonance point of the drive circuit. That is, although driving at the resonance frequency is a guideline for the optimum condition, the resonance frequency is determined by a comprehensive circuit constant including the output inductance of the step-up transformer 20 of the inverter power supply in addition to the capacitance of the light source device 4.
- the resonance frequency is determined by a comprehensive circuit constant including the output inductance of the step-up transformer 20 of the inverter power supply in addition to the capacitance of the light source device 4.
- the essence of the present invention is that in order to drive a light source device composed of a gas discharge device having an external electrode configuration over a long period of time reliably and stably, an initial drive period with a high voltage is provided at the start of initial discharge, and then a low sustain voltage is provided. The point is that steady discharge driving is performed.
- the wall charge self-erasing phenomenon occurs every time the burst driving is turned off and the re-discharge becomes unstable. Duty adjustment can be stably performed by performing steady discharge driving at the sustain voltage level.
- a reliable lighting operation is performed by optimizing the operation sequence in the initial discharge start period.
- stable discharge can be maintained intermittently using wall charges, so the light emission brightness and intensity can be adjusted by adjusting the burst period or duty ratio in the burst drive method, It is possible to compensate for a decrease in light emission intensity due to deterioration of the device over time. Even if the driving is stopped once after a predetermined period of burst driving for a predetermined time, if the stop time is within several tens of hours, the steady lighting operation can be instantaneously restarted without performing the initial driving sequence.
- the duty ratio is set to about 75% in the initial setting, the drive is started at the light emission intensity of 75% of the maximum light emission intensity, and the initial luminance is set to 80 after driving for a long time. After the emission intensity drops to about%, the duty ratio is set to 100% by using the emission intensity adjusting means, and the luminance is improved to about 25%, so that the initial luminance can be restored.
- the adjustment for recovering the light emission intensity is performed by changing the duty ratio once. However, it can be performed several times in small increments. Thus, by adjusting the duty ratio, the practical use time can be lengthened, that is, the product life can be lengthened.
- a method of changing the duty ratio there are a method in which a signal is input from the outside to the control unit of the circuit, a method in which physical means such as a dip switch is built in the circuit in advance, and a switch is switched during maintenance.
- the detection signal is digitized, and the recording tables 323 and 324 of the light emission intensity control circuit 320 are counted. It may be added to a feedback control element that changes the number.
- the voltage detection signal value and the current detection signal value when driving at a predetermined driving frequency from the light emission luminance level at the time of shipment are set as reference levels in each determination circuit, and the change in the detection signal from the set level is set.
- the drive frequency selection search may be performed by feedback control that restores the original value.
- a light source device using gas discharge in particular, a large area mercury-free ultraviolet light source device can be driven stably over a long period of time. It is extremely useful for.
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Abstract
Description
図1は、本発明の第1実施形態として、チューブ形態を持つ紫外発光用ガス放電デバイスの基本構成と、該紫外発光用ガス放電チューブを複数本配列して構成した面発光型光源デバイスの基本構成を説明するための説明図である。
図1(a)は紫外発光ガス放電チューブの断面図である。
図1(a)に示すように、紫外発光用ガス放電チューブ(以下、発光チューブという)1は、外囲器となる扁平楕円形状の横断面を有する細長いガラス管2を主体とし、その内部底面に紫外蛍光体層3を備えると共に、内部にネオンとキセノンを混合した放電ガスを封入して両端を封止している。
図1(b)はこの実施形態の面発光型の光源デバイス4の斜視図である。
図1(a)に示すガラス管2を主体とした発光チューブ1は、図1(b)に示すように発光チューブ1の長手方向と交差する方向に複数本平行に並べられてアレイ構成の光源デバイス4が作られる。
本発明の駆動対象とする面光源デバイスは、上記のような発光チューブ1を複数本配列したチューブアレイ構成を有するものの他、パネル構成としたものでも良い。図3(a)はそのようなパネル構成の面光源デバイス40を説明するための平面図、図(b)および(c)は図3(a)のA-AおよびB-B矢視断面図である。
図4(a)は発光チューブアレイ構成を有する光源デバイス4の概略平面図である。
上記発光チューブアレイ構成の光源デバイス4或いはパネル構成の面光源デバイス40は、何れも外部電極型であり、基本的に正弦波電圧で駆動する。即ちチューブアレイ構成の光源デバイス4を代表例として図4(a)に示すように複数の発光チューブ1に対して共通のX電極14Xを接地した状態で、他方のY電極14Yに正弦波の電圧を印加するよう駆動電源17を接続する。
図5は本発明の対象とする発光チューブ1の放電モデルを時系列的に示す模式図である。図5(a)に示す正弦波電圧が、長電極14Xと14Yに印加される。図5(a)に示した正弦波電圧の上昇過程における電圧v1が、タイミングt1において長電極14Xと14Yの間の電極スリットGに対応した放電空間CSの放電開始電圧Vfを超えると、その対応部でトリガ放電TDが発生する。
この実施形態における駆動回路を図6に示す。この駆動回路は、代表的に示した複数本の発光チューブ1の配列からなる光源デバイス4に接続されたインバータ電源の構成を持つ。即ち、光源デバイス4には、昇圧トランス20の2次巻き線L2が接続され、その1次巻き線L1には電源入力切換え回路21からのDC電圧をAC電圧に変換するスイッチングトランジスタTr1とTr2が接続されている。また、通常のインバータ電源回路と同様、コンデンサC、C1、C2、及び抵抗R1が適宜図示のように接続されている。
〔駆動回路〕
図12は本発明の第2実施形態による光源デバイス4又は面光源デバイス40の駆動回路を示す図6対応図である。この実施形態の特徴は、初期点灯動作後の駆動電圧の引き下げを、第1実施形態のDC電源の切替え方式に代えて、昇圧トランス20に対する1次電流量の制御で行うようにした点にある。
[初期点灯開始シーケンス]
以上の実施形態においては初期点灯開始時と定常点灯時とで駆動電圧を切り換える動作を説明した。しかしながら、初期点灯開始動作に際してスイッチ投入直後に放電開始電圧Vfを超える電圧Voを印加すると、過大なオーバーシュート電圧が発生して駆動回路が破損する危険がある。即ち、駆動すべきガス放電デバイスは容量性の負荷であり、駆動開始前の大きな容量に比べて放電開始後の負荷容量は大幅に小さくなる。従ってインダクタンス成分である昇圧トランスから小容量の負荷にいきなり大きな交番電圧を印加した場合、駆動周波数に応じた二次応答波形の過大なオーバーシュートが発生しやすい傾向があり、部品の耐圧を超える危険がある。
以上、本発明を第1、第2及び第3実施形態によって詳細に説明したが、駆動電圧の最適条件が必ずしも駆動回路の共振点にあるとは限らない。即ち、共振周波数での駆動が最適条件の目安ではあるが、共振周波数は光源デバイス4の容量のほかにインバータ電源の昇圧トランス20の出力インダクタンスを含めた総合的な回路定数で決まるものであり、2次コイルの出力インダクタンスが小さく共振周波数が低くなる場合にそのまま低い周波数で駆動するのがよいわけではない。また光源デバイス4の発光面積を大きくした場合、それに応じて負荷となる容量が変化し、共振周波数も変わるけれども、追従して駆動周波数を変えるのがよいとも限らない。また駆動電圧も必ずしも厳密な正弦波形を有するとは限らず、負荷容量やインダクタンスによる歪を伴った交番波形を含むのは当然である。
2:ガラス管
3:紫外蛍光体層
4:光源デバイス
10:発光チューブアレイ構造体
11:絶縁フィルム
12:粘着材
13:絶縁基板
14:電極対
14X:X電極
14Y:Y電極
15:電極構造体
16C:放熱基板
17:駆動電源
20:昇圧トランス
21:電源入力切換え回路
22:周波数自動調整制御回路
23:スイッチ制御回路
24:周波数制御信号発生部
25:シーケンス選択制御部
26:電圧判定回路
27:電流判定回路
28:電力判定回路
29:振幅切換え制御部
G:電極スリット
L1:1次巻き線
L2:2次巻き線
Claims (15)
- 内部に放電ガスを封入した前面側と背面側を有するガラス外囲器の背面側の外面に対向して放電間隙を構成する隙間を挟んで両側に延びる電極対を配置した構成のガス放電を利用した光源デバイスを駆動する方法であって、
初期放電開始時に前記電極対間に前記放電間隙の放電開始電圧を超える第1の交番駆動電圧を印加して初期放電を発生させた後、前記第1の交番駆動電圧よりも低い第2の交番駆動電圧を印加して定常放電動作を行うことを特徴とするガス放電を利用した光源デバイスの駆動方法。 - 前記光源デバイスの駆動源として、DC電圧を変換した交番駆動電圧を昇圧トランスの2次巻き線から前記電極対間に印加する、駆動電圧切り換え機能を備えたインバータ電源を使用し、前記光源デバイスの初期放電開始後、前記駆動電圧を初期放電開始時に印加した第1の駆動電圧より低い第2の駆動電圧に切り換えて定常放電動作を行うことを特徴とする請求項1記載の光源デバイスの駆動方法
- 前記駆動電圧の切り替えを、前記昇圧トランスの1次巻き線に印加されるDC電源の電圧の切り替えによって行うことを特徴とする請求項2に記載の光源デバイスの駆動方法。
- 前記昇圧トランスの1次巻線に前記DC電圧をAC電圧に変換するスイッチングトランジスタが接続され、前記駆動電圧の切り替えを、前記スイッチトランジスタを駆動する制御信号のデューティ比を変えることによって行うことを特徴とする請求項2に記載の光源デバイスの駆動方法。
- 前記インバータ電源に周波数自動調整制御回路を設け、光源デバイスの初期放電開始期間に駆動周波数を掃引すると共に、その間の駆動電圧と駆動電流を検出して前記自動周波数調整制御回路にフィードバックして最適駆動周波数をサーチするようにしたことを特徴とする請求項2又は3の何れか1項に記載の光源デバイスの駆動方法。
- 前記駆動周波数の掃引動作が光源デバイスとそれに接続され前記昇圧トランスの2次巻き線で定まる共振周波数を中心として予め定められた周波数幅において行われることを特徴とする請求項5記載の光源デバイスの駆動方法。
- 前記駆動電圧と駆動電流の検出がそれぞれ予め定めた基準値に対する相対値として検出され、前記駆動周波数の掃引幅内における変化の最大値が得られた点の周波数を最適駆動周波数として選択することを特徴とする請求項5記載の光源デバイスの駆動方法。
- 前記定常放電動作が、前記第2の交番駆動電圧を断続的に印加して行われることを特徴とする請求項1記載の光源デバイスの駆動補法。
- 前記定常放電動作時における交番駆動電圧の印加時間と非印加時間の繰り返し周期とデューティ比率の少なくとも一方を変えて発光強度の調整を行うことを特徴とする請求項4記載の光源デバイスの駆動方法。
- 前記初期放電開始時の駆動が緩衝期間と、書き込み期間と、安定化期間を含む動作シーケンスで行われ、緩衝期間においては電極対間に印加する交番駆動電圧の振幅を次第に増大し、書き込み期間においては電極対間に放電開始電圧を超える振幅の第1の交番駆動電圧を印加し、安定化期間においては書き込み期間の駆動電圧よりも低い交番駆動電圧を印加することを特徴とする請求項1記載の光源デバイスの駆動方法。
- 前記初期放電開始期間の後の定常放電動作時に印加する第2の交番駆動電圧が、当該初期放電開始期間に発生した放電を、当該放電に伴う壁電荷を利用して維持する電圧に設定してあることを特徴とする請求項1、8又は9の何れか1項に記載の光源デバイスの駆動方法。
- 放電ガスを封入したガラス細管と、該ガラス細管の外面に対向して長手方向に放電間隙を隔てて広がる電極対を備えた外部電極型の放電チューブを複数本平行に配列した構成を有するガス放電を利用した光源デバイスを駆動する方法であって、初期放電開始のための電源投入後に高い正弦波駆動電圧を印加することにより前記放電チューブ内部に放電を発生させてチューブ内壁面に壁電荷を形成したのち、この壁電荷を利用してそれより低い電圧の正弦波を印加して放電を持続するとともに、この低い正弦波駆動電圧を間欠的に加えることにより発光強度を調整可能とすることを特徴とするガス放電を利用した光源デバイスの駆動方法。
- 内部に放電ガスを封入した前面側と背面側を有するガラス外囲器の背面側の外面に対向して放電間隙を構成する隙間を挟んで両側に延びる電極対を配置した構成のガス放電を利用した光源デバイスを駆動する駆動回路であって、前記電極対間に印加する交番駆動電圧を発生する電源部と、前記交番駆動電圧の電圧値を初期放電開始時とその後の定常放電時とで変更する電圧制御部と、交番駆動電圧の印加を断続的に制御すると共に、印加時間と非印加時間の繰り返し周期とデューティ比率の少なくとも一方を調整可能な制御部を備えて成ることを特徴とする駆動回路。
- 前記光源デバイスが、放電ガスを封入した複数本のガラス細管と、該ガラス細管の外面に対向して長手方向に放電間隙を隔てて広がる電極対を備えたガス放電チューブアレイ構成を有し、前記電源回路が前記電極対間に正弦波駆動電圧を印加するインバータ電源の構成を有し、かつ前記電圧制御部が前記インバータ電源に含まれる昇圧トランスの一次巻線に供給する電流方向を交互に切り換えるスイッチングトランジスタに対する制御信号のデューティ比を変えて前記昇圧トランスの二次巻線から前記電極対間に印加する交番駆動電圧の電圧値を変更することを特徴とする請求項13記載のガス放電を利用した光源デバイスの駆動回路。
- 内部に紫外線発光蛍光体層を有すると共に放電ガスを封入した複数本の放電チューブを紫外線照射面に沿って平行に配列し、該紫外線照射面の裏側に対向して各放電チューブの長手方向に放電間隙を隔てて広がる共通の電極対を配置した構成を有するガス放電を利用した紫外光源デバイスと、前記共通の電極対間に交番駆動電圧を印加するインバータ電源とを備えてなり、かつ前記インバータ電源に前記交番駆動電圧の電圧値を切り換える電圧制御部と、交番駆動電圧の印加を所定の周期とデューティ比で断続的に行う制御部とを設けたことを特徴とするガス放電を利用した紫外線照射装置。
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109121262A (zh) * | 2017-06-26 | 2019-01-01 | 波音公司 | 用于操作照明系统的系统和方法 |
CN109257853A (zh) * | 2017-07-12 | 2019-01-22 | 美的智慧家居科技有限公司 | 获取光照强度阈值的方法及装置 |
JP2020080297A (ja) * | 2018-11-12 | 2020-05-28 | 株式会社紫光技研 | 発光管アレイ型光源装置及びそれを利用した光源モジュールと流体処理装置 |
US11011367B2 (en) | 2018-11-12 | 2021-05-18 | Shikoh Tech Co., Ltd. | Light-emitting tube array-type light source device |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4011400A1 (en) * | 2020-12-11 | 2022-06-15 | The Boeing Company | Ultraviolet light sanitizing system and method with distributed power |
KR102585540B1 (ko) * | 2021-05-14 | 2023-10-06 | 유니램 주식회사 | 엑시머 램프 및 이를 포함하는 광 조사 장치 |
KR102585541B1 (ko) * | 2021-05-14 | 2023-10-06 | 유니램 주식회사 | 광 조사 장치 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06251754A (ja) * | 1992-12-28 | 1994-09-09 | Mitsubishi Electric Corp | ガス放電表示装置 |
JP2004170074A (ja) * | 2002-11-15 | 2004-06-17 | Nec Lighting Ltd | 紫外面光源及びこれを用いた蛍光トランスイルミネーター |
JP2011040271A (ja) * | 2009-08-11 | 2011-02-24 | Shinoda Plasma Kk | 平面光源 |
Family Cites Families (16)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP3532578B2 (ja) | 1991-05-31 | 2004-05-31 | 三菱電機株式会社 | 放電ランプおよびこれを用いる画像表示装置 |
US6429586B1 (en) * | 1998-02-13 | 2002-08-06 | Hitachi, Ltd. | Gas discharge display panel and gas discharge display device having electrodes formed by laser processing |
JPH11233024A (ja) * | 1998-02-19 | 1999-08-27 | Sony Corp | 表示装置 |
JP4945033B2 (ja) * | 2001-06-27 | 2012-06-06 | 日立プラズマディスプレイ株式会社 | プラズマディスプレイ装置 |
JP4083198B2 (ja) * | 2004-05-25 | 2008-04-30 | 篠田プラズマ株式会社 | 表示装置の駆動方法 |
TWI261286B (en) | 2004-08-31 | 2006-09-01 | Mirae Corp | Flat fluorescent lamp for display devices |
JP5074381B2 (ja) | 2005-04-14 | 2012-11-14 | コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ | Uvc放射線発生素子 |
JP2007035497A (ja) * | 2005-07-28 | 2007-02-08 | Sony Corp | 放電灯点灯装置、放電灯の点灯方法、光源装置、表示装置 |
FR2890232A1 (fr) | 2005-08-23 | 2007-03-02 | Saint Gobain | Lampe plane a decharge coplanaire et utilisations |
DE102009026834A1 (de) * | 2008-06-11 | 2009-12-24 | Samsung Corning Precision Glass Co., Ltd., Gumi | Filter und Anzeigevorrichtung mit demselben |
WO2010143403A1 (ja) * | 2009-06-08 | 2010-12-16 | パナソニック株式会社 | プラズマディスプレイパネルの駆動方法およびプラズマディスプレイ装置 |
JP4885286B2 (ja) * | 2010-03-17 | 2012-02-29 | 篠田プラズマ株式会社 | 紫外光照射装置 |
JP2010219073A (ja) | 2010-07-08 | 2010-09-30 | Gs Yuasa Corp | 誘電体バリア放電ランプ及び誘電体バリア放電装置 |
JP2013118070A (ja) | 2011-12-02 | 2013-06-13 | Shinoda Plasma Kk | 発光管アレイ型表示装置 |
US8836240B2 (en) * | 2012-06-30 | 2014-09-16 | Osram Sylvania Inc. | Dim mode start for electrodeless lamp ballast |
GB2509912B (en) * | 2013-01-16 | 2018-08-15 | Sony Corp | Telecommunications Apparatus and Methods |
-
2016
- 2016-11-14 JP JP2017553745A patent/JP6670508B2/ja active Active
- 2016-11-14 US US15/571,922 patent/US10128100B2/en active Active
- 2016-11-14 CN CN201680027292.5A patent/CN107535040B/zh active Active
- 2016-11-14 WO PCT/JP2016/083695 patent/WO2017094483A1/ja active Application Filing
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06251754A (ja) * | 1992-12-28 | 1994-09-09 | Mitsubishi Electric Corp | ガス放電表示装置 |
JP2004170074A (ja) * | 2002-11-15 | 2004-06-17 | Nec Lighting Ltd | 紫外面光源及びこれを用いた蛍光トランスイルミネーター |
JP2011040271A (ja) * | 2009-08-11 | 2011-02-24 | Shinoda Plasma Kk | 平面光源 |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN109121262A (zh) * | 2017-06-26 | 2019-01-01 | 波音公司 | 用于操作照明系统的系统和方法 |
EP3442313A1 (en) * | 2017-06-26 | 2019-02-13 | The Boeing Company | Systems and methods for operating a light system |
US10624979B2 (en) | 2017-06-26 | 2020-04-21 | The Boeing Company | Systems and methods for operating a light system |
CN109257853A (zh) * | 2017-07-12 | 2019-01-22 | 美的智慧家居科技有限公司 | 获取光照强度阈值的方法及装置 |
CN109257853B (zh) * | 2017-07-12 | 2019-12-27 | 美的智慧家居科技有限公司 | 获取光照强度阈值的方法及装置 |
JP2020080297A (ja) * | 2018-11-12 | 2020-05-28 | 株式会社紫光技研 | 発光管アレイ型光源装置及びそれを利用した光源モジュールと流体処理装置 |
US11011367B2 (en) | 2018-11-12 | 2021-05-18 | Shikoh Tech Co., Ltd. | Light-emitting tube array-type light source device |
JP7284991B2 (ja) | 2018-11-12 | 2023-06-01 | 株式会社紫光技研 | 光源装置及びそれを利用した光源モジュールと流体処理装置 |
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