JP4877379B2 - Light source device and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light source device capable of restraining a characteristic or the like from being deteriorated, by regulating properly switching between an initial operation before electric power reaches a rated value and an ordinary operation after the electric power reaches the rated value, and to provide a projector built in with the same. <P>SOLUTION: A controller 70b carries out an operating condition selected from the plurality of operating conditions, in response to a determination result of state classification of an arc tube 1, in concretely saying, sets a value of a current supplied to the arc tube 1 to a value suitable for a state of the arc tube 1, to carry out the initial operation for starting-up and leading-up (steps S14, S15), and then sets a chopping wave rise-up rate of a waveform superposed with a chopping wave on a rectangular wave supplied to the arc tube 1, to a value suitable for the state of the arc tube 1, to carry out the ordinary operation (step S16), and the proper operation is thereby secured in response to the state classification of the arc tube 1. A light-emitting state of the arc tube 1 is maintained in a satisfactory state of reduced flickering or the like for a long period, and a service life of the arc tube 1 is prolonged, by this manner. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a light source device including a discharge lamp having a pair of electrodes, and a projector incorporating such a light source device.

  The state of the discharge lamp incorporated in the discharge light-emitting type light source device changes with time of use. In particular, the electrode is consumed during lighting, and its shape changes with time. Similarly, the crystalline state of tungsten, which is a constituent material of the electrode, and the content of impurities also change with time. A driving method for detecting a change in the state as described above by a lamp voltage or the like and adjusting a driving waveform in a steady state, or a driving method for monitoring a usage integration time and adjusting the driving waveform according to the usage integration time is disclosed. (See Patent Documents 1 to 6).

International Publication No. 2004/066687 Pamphlet JP 2005-276623 A JP 2004-39563 A JP 2003-264094 A JP 2005-310484 A JP 2005-209572 A

  However, all of the above driving methods are targeted after the power reaches the rated value, the management of the state of the electrode before reaching the rated value is insufficient, and the occurrence of flicker is accelerated or the life of the electrode is shortened. There was a case. In other words, it has been found that the progress of electrode deterioration changes greatly depending on the setting of the drive waveform in the initial operation until the power reaches the rated value. After reaching the rated value and the initial operation before the rated value is reached. It is thought that it is necessary to comprehensively adjust the steady state operation.

  Accordingly, the present invention provides a light source device capable of appropriately suppressing the initial operation before the power reaches the rated value and the steady operation after the power reaches the rated value to suppress deterioration of characteristics, and a projector incorporating the same. The purpose is to do.

  In order to solve the above problems, a light source device according to the present invention includes: (a) an arc tube having a first electrode and a second electrode that emit light by discharge between each other; and (b) a first electrode and a second electrode. A driving unit that performs a steady operation for supplying steady energy to the first electrode and an initial operation for supplying energy to the first electrode and the second electrode in an operation different from the steady operation before performing the steady operation; and (c) the arc tube A determination unit for determining a state; (d) a plurality of initial power supply conditions provided corresponding to the state of the arc tube as an aspect of the initial operation; and a state corresponding to the state of the arc tube as an aspect of the steady operation. A data storage unit that stores a plurality of steady power supply conditions, and (b1) the drive unit performs an initial operation under any of the conditions selected from the plurality of initial power supply conditions according to a determination result by the determination unit. Depending on the judgment result by the judgment unit Perform steady operation in any of the conditions selected from the conventional power supply condition.

  In the light source device, the drive unit performs an initial operation under any condition selected from a plurality of initial power supply conditions according to a determination result by the determination unit, and a plurality of steady power supply conditions according to the determination result by the determination unit. Since the steady operation is performed under any of the conditions selected from the above, an appropriate initial operation and steady operation according to the state of the arc tube are executed. Therefore, the luminous state of the arc tube can be maintained in a good state with little flicker for a long period of time, and the lifetime of the arc tube can be extended.

  Further, according to a specific aspect or viewpoint of the present invention, in the light source device, the driving unit individually switches between the initial operation and the steady operation according to the determination result by the determination unit. In this case, the initial operation and the steady operation can be made appropriate, and each stage of the operation of the light source device can be adjusted in accordance with the state of the arc tube.

  In another aspect of the present invention, the plurality of initial power supply conditions include a plurality of stages corresponding to the determination result by the determination unit, and the first electrode is switched when the initial operation is switched according to the determination result by the determination unit. The supply energy supplied to the second electrode and the second electrode are changed. In this case, the content of the initial operation can be reliably adjusted by a plurality of stages of supplied energy.

  In yet another aspect of the present invention, a plurality of initial power supply conditions correspond to a plurality of stages of deterioration of the arc tube, and an initial operation start of the initial power supply conditions corresponding to a low stage of arc tube deterioration. The current value in the initial power supply condition corresponding to the stage where the deterioration of the arc tube is high is smaller than the current value during the start operation period provided in FIG. In this case, in the starting operation, it is possible to suppress the tendency for arc discharge to be easily formed in the sealed portion from the needle-like crystal formed on the base side of the electrode, and to prevent the deterioration of the arc tube.

  In yet another aspect of the present invention, the initial operation includes a start-up operation performed after the start-up operation, and the plurality of initial power supply conditions correspond to a plurality of stages of deterioration of the arc tube. The current of the initial power supply condition corresponding to the stage where the deterioration of the arc tube is higher than the amount of increase in the current value at the end of the initial power supply condition corresponding to the low stage of the deterioration of the tube during the start-up operation period of the initial operation The increase in value is greater. In this case, even when the unevenness formed around the protrusion on the tip end side of the electrode becomes difficult to be melted with the aging in the start-up operation, the unevenness can be surely melted. In addition, it is possible to suppress the tendency of the protrusion-like tip portion to hardly grow with time during steady operation, and it is possible to prevent the deterioration of the arc tube from being accelerated.

  In still another aspect of the present invention, a plurality of steady power supply conditions correspond to a plurality of stages of deterioration of the arc tube, and the first electrode of the steady power supply condition corresponding to a low stage of arc tube deterioration and Of the AC power supplied to each of the second electrodes, the power in the steady power supply condition corresponding to the stage where the arc tube is highly deteriorated is larger than the power supplied in the latter half of the half cycle. In this case, the tip portion can be grown or maintained while the irregularities formed at the tip portions of the first electrode and the second electrode are melted at the initial stage. At this time, even when the unevenness formed at the tip portion of the electrode becomes difficult to be melted along with deterioration with time, the unevenness can be surely melted. In addition, it is possible to suppress a tendency that the protruding tip portion hardly grows with time during steady operation.

  The projector according to the present invention includes (a) the above-described light source device, (b) a light modulation device that is illuminated by illumination light from the light source device, and (c) projection optics that projects an image formed by the light modulation device. System.

  Since the projector uses the above-described light source device, the light source device can be replaced over a long period of time by keeping the light emitting state of the arc tube in a good state with little flicker over a long period of time and a long-life arc tube. The projector can project an unnecessary and good image.

It is sectional drawing explaining the light source device of 1st Embodiment. It is a block diagram which shows the structure of the current drive device integrated in the light source device. It is an enlarged view explaining the front-end | tip peripheral part of a pair of electrode. (A)-(C) are the enlarged views explaining repair of the electrode by a light source drive device. (A)-(C) are the enlarged views explaining repair of the electrode by a light source drive device. It is a graph which illustrates notionally an example of the energization state of a luminous tube. (A)-(C) is a graph explaining the example of a drive at the time of start-up operation. (A)-(C) is a graph explaining the example of a drive at the time of start-up operation. (A)-(C) is a graph explaining the example of a drive at the time of steady operation. It is a flowchart explaining operation | movement of the light source device shown in FIG. It is a figure explaining the projector incorporating a light source device.

[First Embodiment]
The structure, operation, etc. of the light source device according to the first embodiment of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view conceptually illustrating the structure of the light source device 100. In the light source device 100, a light source unit 10 that is a discharge lamp includes a discharge light emitting type arc tube 1, a reflector 2 that is an elliptical main reflecting mirror, and a sub mirror 3 that is a spherical sub reflecting mirror. The light source driving device 70 is an electric circuit for supplying an alternating current to the light source unit 10 to emit light in a desired state, details of which will be described later.

  In the light source unit 10, the arc tube 1 is composed of a translucent quartz glass tube having a central portion swelled in a spherical shape, and a main body portion 11 that is a sealing body that emits illumination light, and the main body portion 11. First and second sealing portions 13 and 14 extending along an axis passing through both ends are provided.

  In the discharge space 12 formed in the main body portion 11, the tip portion of the first electrode 15 made of tungsten and the tip portion of the second electrode 16 made of tungsten are similarly spaced apart by a predetermined distance. Gas, which is a discharge medium containing gas, metal halide, and the like, is enclosed. Inside each sealing portion 13, 14 extending at both ends of the main body portion 11, a metal made of molybdenum that is electrically connected to the root portions of the first and second electrodes 15, 16 provided on the main body portion 11. The foils 17a and 17b are inserted, and both the sealing portions 13 and 14 are hermetically sealed to the outside by themselves or a glass material or the like. When an AC voltage is applied to the lead wires 18a and 18b connected to the metal foils 17a and 17b by the light source driving device 70, arc discharge occurs between the pair of electrodes 15 and 16, and the main body portion 11 emits light with high luminance. . Here, as is clear from FIG. 1, the reflector 2 is disposed on the first electrode 15 side, and the secondary mirror 3 is disposed on the second electrode 16 side so as to face the reflector 2.

  Nearly half of the main body portion 11 of the arc tube 1 on the front side of the light emission is covered by the sub mirror 3. The secondary mirror 3 is an integrally molded product made of quartz glass. The secondary mirror 3a returns the light beam radiated forward from the main body portion 11 of the arc tube 1 to the main body portion 11, and the base portion of the secondary reflecting portion 3a. The support part 3b fixed to the circumference | surroundings of the 2nd sealing part 14 is supported. The support portion 3 b allows the second sealing portion 14 to pass therethrough and holds the sub-reflecting portion 3 a in an aligned state with respect to the main body portion 11.

  The reflector 2 is an integrally molded product made of crystallized glass or quartz glass, and has a neck-shaped portion 2a through which the first sealing portion 13 of the arc tube 1 is inserted, and an elliptically curved main body extending from the neck-shaped portion 2a. The reflection part 2b is provided. The neck portion 2 a is inserted through the first sealing portion 13 and holds the main reflection portion 2 b in an aligned state with respect to the main body portion 11.

  The arc tube 1 is disposed along the system optical axis OA corresponding to the optical axis of the main reflection portion 2b, and the emission center O between the first and second electrodes 15 and 16 in the main body portion 11 is the main reflection portion. It is arranged so as to coincide with the first focal point F1 position of the elliptical curved surface of 2b. When the arc tube 1 is turned on, the light beam radiated from the main body portion 11 is reflected by the main reflecting portion 2b, or reflected by the sub-reflecting portion 3a and further reflected by the main reflecting portion 2b, and the second focal point of the elliptical curved surface. The light beam converges to the F2 position. In other words, the reflector 2 and the secondary mirror 3 have reflection curved surfaces that are substantially axisymmetric with respect to the system optical axis OA, and the pair of electrodes 15 and 16 have their axial axes that are substantially coincident with the system optical axis OA. It is arranged to let you.

  The arc tube 1 supports, for example, the first and second electrodes 15 and 16 fixed to the tips of the metal foils 17a and 17b in a quartz glass tube, and a quartz glass tube at a portion corresponding to both the sealing portions 13 and 14. It is made by a syring seal that softens and shrinks by heating with a burner from the surroundings. The arc tube 1 is fixed by injecting, filling, and solidifying the inorganic adhesive C in a state where the first sealing portion 13 is inserted into the neck 2a of the reflector 2, and the secondary mirror 3 is fixed to the arc tube 1 In the state where the support portion 3b is inserted through the second sealing portion 14, the inorganic adhesive C is injected, filled, and solidified.

  FIG. 2 is a block diagram schematically showing a configuration of a light source driving device 70 for lighting the light source unit 10 shown in FIG. 1 in a desired state.

  The light source driving device 70 generates an alternating current for discharging between the pair of electrodes 15 and 16 shown in FIG. 1 and the like, and controls the supply state of the alternating current to both the electrodes 15 and 16. The light source driving device 70 includes a lighting device 70a, a control device 70b, and a DC / DC converter 70c. Here, as an example, a case where the light source driving device 70 uses an external power source will be described. That is, the light source driving device 70 is connected to the AC / DC converter 81, and the AC / DC converter 81 is connected to the commercial power source 90. The AC / DC converter 81 converts an alternating current supplied from the commercial power supply 90 into a direct current.

  The lighting device 70a is a circuit portion that drives the light source unit 10 of FIG. The lighting device 70a adjusts the frequency, amplitude, duty ratio, positive / negative voltage or current ratio, output waveform, and the like of the output of the light source driving device 70, and outputs an arbitrary waveform such as a rectangle, a triangular wave, a superimposed wave thereof, and the like. .

  The control device 70b is, for example, a circuit unit including a microcomputer, a memory, a sensor, an interface, and the like, and is driven by an appropriate drive voltage generated by a DC / DC converter 70c that is a power source. The control device 70b includes a drive control unit 74 that controls the operation state of the lighting device 70a, a determination unit 75 that determines the state of the arc tube 1, and data that stores various information such as the operation mode of the lighting device 70a, that is, power supply conditions. And a storage unit 76. In addition, the control device 70 b includes a timer 77 for measuring the cumulative lighting time of the arc tube 1 and a voltage sensor 78 that detects a voltage to the arc tube 1.

  The drive control unit 74 is a part that operates according to a program stored in the data storage unit 76 and the like, and selects a light source that matches the current state of the arc tube 1 from a number of power supply conditions stored in the data storage unit 76, and lights up An initial operation and a steady operation corresponding to the device 70a are performed. The drive control unit 74 functions as a drive unit for supplying power to the arc tube 1 to perform a necessary lighting operation in cooperation with the lighting device 70a.

  The determination unit 75 is a part that determines which level the accumulated lighting time of the arc tube 1 is and what level the voltage to the arc tube 1 is. Specifically, it corresponds to which time range (state category) in which the cumulative lighting time of the arc tube 1 is divided, and to which voltage range (state category) in which the voltage to the arc tube 1 is divided. (Which stage is the deterioration of the arc tube 1) is determined.

  The data storage unit 76 stores a plurality of initial power supply conditions as modes of the initial operation of the arc tube 1 and stores a plurality of steady power supply conditions as modes of the steady operation of the arc tube 1. Specifically, the data storage unit 76 stores a current setting value at the time of a start operation and a start-up operation included in the initial operation, and stores a frequency in a steady operation and a triangular wave jumping rate of a superimposed wave. Here, the triangular wave jumping rate means a relative increase rate of the power supplied in the second half of the half cycle of the AC power supplied to the first and second electrodes 15 and 16, respectively.

  The timer 77 checks the lighting time of the arc tube 1, and holds the cumulative lighting time obtained by accumulating the lighting time of each time. The voltage sensor 78 detects and holds a voltage applied between the first and second electrodes 15 and 16 of the arc tube 1 via the lighting device 70a.

  FIG. 3 is an enlarged view of the tip portions of the first and second electrodes 15 and 16 sealed in the arc tube 1. The first and second electrodes 15 and 16 include tip portions 15a and 16a, main body portions 15b and 16b, coil portions 15c and 16c, and core rods 15d and 16d. The heat capacity can be increased by providing the bulky main body portions 15b and 16b on the distal ends of the first and second electrodes 15 and 16. Note that the tip portions of the first and second electrodes 15 and 16 are formed by winding tungsten around the core rods 15d and 16d and heating and melting them before the encapsulation. At this time, the remaining portions of the wound tungsten that have not been melted become the coil portions 15c and 16c.

  As the cumulative lighting time of the arc tube 1 increases, needle crystals 65 are formed on the coil portions 15c and the core rod 16d of the first and second electrodes 15 and 16, as shown in the figure. The acicular crystal 65 is formed with the passage of the lighting time of the arc tube 1 and tends to extend gradually. Once such a needle crystal 65 is formed, a discharge tends to occur from the needle crystal 65 toward the inner wall of the main body portion 11, and when such a discharge becomes stronger, the inner wall of the main body portion 11 is deteriorated, This is considered to be a cause of shortening the life of the arc tube 1. Therefore, in the present embodiment, the current setting value at the start operation of the initial operation of the arc tube 1 is gradually reduced, for example, as the cumulative lighting time increases, by the operation of the light source driving device 70. Thereby, the discharge from the acicular crystal 65 to the inner wall of the main body portion 11 is suppressed, and the life of the arc tube 1 is prevented from being shortened.

  FIG. 4 is an enlarged view for explaining the repair of the first and second electrodes 15 and 16 by the light source driving device 70. As the cumulative lighting time of the arc tube 1 increases, as shown in FIG. 4A, in the first and second electrodes 15 and 16, a plurality of tip end regions 15g and 16g around the tip portions 15a and 16a are plural. The irregularities 61 are irregularly generated. In this case, a phenomenon in which the discharge starting point moves between the tip 15a and the unevenness 61, that is, flicker or arc jump occurs. Here, flicker means that the movement of the discharge starting point occurs continuously, and arc jump means that the discharge starting point moves completely from the initial discharge starting point position. Flicker causes flicker, and arc jump causes decrease in illuminance. Such irregularities 61 are melted and smoothed by increasing the final current value during the start-up operation in the initial operation of the arc tube 1 as shown in FIG. That is, the temperature rises to some extent by the end of the start-up operation, but further increases due to the increase in current at the end, and the unevenness 61 is smoothed while leaving the tip portions 15a and 16a. Thereafter, as shown in FIG. 4C, the tip portions 15a and 16a can be grown larger by the steady operation of the arc tube 1. However, when the deterioration of the first and second electrodes 15 and 16 progresses and the cumulative lighting time becomes longer, both the electrodes 15 and 16 are consumed and the unevenness 61 needs to be smoothed. , 16a gradually becomes difficult to melt. Therefore, in the present embodiment, the current setting value at the end of the start-up operation in the initial operation of the arc tube 1 is gradually increased, for example, as the cumulative lighting time increases by the operation of the light source driving device 70. Thereby, even if the unevenness | corrugation 61 becomes difficult to melt | dissolve with progress of the lighting time of the arc_tube | light_emitting_tube 1, these can be melt | dissolved reliably. Moreover, it can prevent that the growth of the front-end | tip parts 15a and 16a is prevented.

  FIG. 5 is an enlarged view for explaining the growth of the first and second electrodes 15 and 16 by the light source driving device 70. FIG. 5A shows the tip portions 15a and 16a that are partially melted and deformed and shortened during the startup operation of the initial operation described above. When the cumulative lighting time of the first and second electrodes 15 and 16 becomes longer, the tip portions 15a and 16a become difficult to grow gradually. Therefore, in the present embodiment, the light source driving device 70 is supplied in the latter half of a half cycle of the AC power supplied to the first electrode and the second electrodes 15 and 16 in the steady operation of the arc tube 1 by the operation of the light source. The triangular wave jumping rate corresponding to the relative increase in power is increased. Thereby, it is possible to promote the growth of the tip portions 15a and 16a during the steady operation and maintain the desired shape of the tip portions 15a and 16a as shown in FIG.

  Hereinafter, a specific operation of the light source driving device 70 will be described. FIG. 6 is a graph conceptually illustrating an example of an energized state from the initial operation to the steady operation of the arc tube 1. In the graph, the horizontal axis indicates the elapsed time from the start of lighting, and the vertical axis indicates the voltage (dashed line), power (dashed line), and current (solid line) supplied to the arc tube 1. In this example, an initial operation period of about 60 seconds is provided, and then a steady operation period corresponding to the rated operation is provided. The initial operation period is a period for supplying transient energy (specifically, transient power) to the arc tube 1, and the steady operation period is steady energy (specifically, steady power) to the arc tube 1. ). In this case, the initial operation period is provided with a start-up operation of about several seconds and a subsequent start-up operation of about 60 seconds. The voltage gradually increases during the initial operation period and saturates to a constant value during the steady operation period. Further, the power gradually increases at the start-up during the initial operation period, and saturates to a constant value during the steady operation period. Further, the current is controlled so as to maintain a predetermined value during the initial operation period after the dielectric breakdown, and is temporarily increased at the end of the start-up operation, and the power becomes a predetermined value during the subsequent steady operation period. And is maintained at a substantially constant value.

  FIGS. 7A to 7C are graphs conceptually illustrating an example of driving in the start operation of FIG. 6, that is, the region A <b> 1. In each graph, the horizontal axis indicates time, and the vertical axis indicates current. FIG. 7A is a diagram for explaining the supply of an alternating current with a short cumulative lighting time, that is, during a starting operation for a new arc tube 1. In this case, the arc tube 1 is supplied with a rectangular alternating current having a current value A1. FIG. 7B is a diagram for explaining the supply of an alternating current during the starting operation to the arc tube 1 having a medium cumulative lighting time, that is, used to some extent. In this case, a rectangular wave alternating current having a current value A2 smaller than the current value A1 is supplied to the arc tube 1. FIG. 7C is a diagram for explaining the supply of an alternating current during a starting operation for the old arc tube 1 having a long cumulative lighting time. In this case, a rectangular wave alternating current having a current value A3 smaller than the current value A2 is supplied to the arc tube 1. That is, the current value of the arc tube 1 is decreased as the cumulative lighting time of the arc tube 1 increases. This prevents a strong discharge from occurring from the acicular crystals 65 growing on the first and second electrodes 15 and 16 and suppresses the phenomenon that the life of the arc tube 1 is shortened.

  The driving waveform during the start-up operation of lighting causes a normal discharge from the first and second electrodes 15 and 16, and the arc discharge to the main body portion 11 is caused by the discharge continuing for a long time at a certain point. Try to prevent it. At the beginning of discharge immediately after dielectric breakdown, discharge is also generated from the coil portions 15c and 16c, and the entire electrodes 15 and 16 are heated during that time. When the protruding tip portions 15a and 16a reach a sufficiently high temperature, the discharge position moves from the coil portions 15c and 16c to the tip portions 15a and 16a. An abnormal phenomenon such as discharge to the main body portion 11 is likely to occur during discharge from the coil portions 15c and 16c and the needle-like crystal 65. Therefore, during the starting operation, the discharge position is changed to the tip portion by heating the electrodes 15 and 16. It is desirable to move quickly to 15a, 16a. For this reason, the polarity is reversed before the discharge position is heated excessively, and arc discharge to the main body portion 11 is avoided. As described above, the acicular crystal 65 tends to grow as the cumulative lighting time increases. In order to prevent premature deterioration of the arc tube 1 due to this, the current value during the starting operation of the arc tube 1 is decreased. I am going to do that.

  FIGS. 8A to 8C are graphs conceptually illustrating an example of driving in the final period, that is, the region A2 during the start-up operation of FIG. In each graph, the horizontal axis indicates time, and the vertical axis indicates current. FIG. 8A is a diagram for explaining the supply of alternating current at the end of the start-up operation for the new arc tube 1 with a short cumulative lighting time. In this case, a rectangular wave alternating current is supplied to the arc tube 1, and the current value increases to B1. FIG. 8B is a diagram for explaining the supply of an alternating current at the end of the start-up operation to the arc tube 1 having a medium cumulative lighting time, that is, used to some extent. In this case, a rectangular wave alternating current is supplied to the arc tube 1, and the current value increases to B2 larger than B1. FIG. 8C is a diagram for explaining the supply of alternating current at the end of the start-up operation for the old arc tube 1, that is, the cumulative lighting time is long. In this case, a rectangular wave alternating current is supplied to the arc tube 1, and the current value increases to B3 which is larger than B2. That is, as the cumulative lighting time of the arc tube 1 increases, the amount of increase in AC current at the end of the startup operation is increased. Thereby, even if the cumulative lighting time of the arc tube 1 increases and the deterioration of the first electrode and the second electrodes 15 and 16 progresses, it is possible to ensure the melting amount of the unevenness 61 in the tip side regions 15g and 16g. It is possible to prevent the growth of the tip portions 15a and 16a from being hindered.

  Note that the driving waveform at the initial startup is such that the arc tube 1 can reach a steady state in a short time without excessively damaging the first and second electrodes 15 and 16. Here, the electrode damage means that the electrodes 15 and 16 are overheated by an excessive current, and the tip portions 15a and 16a are melted and flattened. This is a problem in that the arc length becomes long, causing a decrease in illuminance in an illumination target such as a projector. However, if this melting phenomenon is appropriately used, the unevenness 61 around the worn tip portions 15a and 16a can be melted once, and the tip portions 15a and 16a can be melted appropriately. The portions 15a and 16a can be gradually grown. Since the light emission brightness increases by increasing the amount of current supplied to the arc tube 1, if the illumination target is a projector, the illuminance of the image may change temporarily and adversely affect the quality if this repair is performed in a steady state. There is. However, in the start-up stage before reaching the rating as in the present embodiment, the illuminance continuously increases, so there is no need to consider a temporary change in illuminance. That is, by enlarging the current-carrying amount of the arc tube 1 and melting the irregularities 61 around the tip portions 15a and 16a, even if illuminance changes occur due to changes in the current amount or shape changes of the tip portions 15a and 16a, There is no detrimental adverse effect.

  Regarding such repairs, it has been experimentally confirmed that when the first electrode 15 and the second electrode 15 and 16 are consumed, the tip portions 15a and 16a are hardly dissolved. The causes are as follows: (1) Since the distance between the tip portions 15a, 16a and the main body portion 11 is shortened, heat radiation from the tip portions 15a, 16a to the main body portion 11 is promoted, and the temperature is hardly increased. (2) During lighting, the crystal of tungsten, which is an electrode constituent material, is coarsened, and the melting point is increased compared to the case where the crystal grains are small, and it is difficult to dissolve. (3) During lighting, the first electrode and The impurities in the second electrodes 15 and 16 are evaporated and desorbed, the purity of tungsten is increased, and the melting point is increased accordingly. For this reason, even when the first electrode and the second electrodes 15 and 16 are consumed, the arc tube 1 generates a larger current than the time when the cumulative lighting time is short in order to achieve the protrusion re-formation by melting as described above. It is necessary to cause the dissolution phenomenon. Based on this idea, as described above, as the cumulative lighting time of the arc tube 1 increases, the amount of increase in the alternating current at the end of the startup operation is increased.

  FIGS. 9A to 9C are diagrams for explaining the operation after reaching the rating, and are graphs for conceptually explaining an example of driving in the steady operation period of FIG. 6, that is, the region A3. In each graph, the horizontal axis indicates time, and the vertical axis indicates current. FIG. 9A is a diagram for explaining the supply of alternating current with a short cumulative lighting time, that is, during a steady operation period for the new arc tube 1. In this case, a rectangular wave alternating current is supplied to the arc tube 1, and its current value is C0. FIG. 9B is a diagram for explaining the supply of alternating current to the arc tube 1 having a medium cumulative lighting time, that is, used to some extent during a steady operation period. In this case, a superposed wave in which a triangular wave is superimposed on a rectangular wave is supplied to the arc tube 1, and the average current value is maintained at C0, but the peak value of the superposed wave is C2. Yes. Here, assuming that the ratio of the peak value C2 to the average current value C0 is the triangular wave jumping rate of the superimposed wave, the triangular wave jumping rate C2 / C0 is higher than the triangular wave jumping rate 1 in FIG. . Thus, when the triangular wave jumping rate C2 / C0 is larger than 1, of the AC power supplied to the first electrode and the second electrode 15 and 16 of the arc tube 1 when the cumulative lighting time is medium, The power supplied in the second half of the half cycle corresponding to the anode is the second half of the half cycle of the AC power supplied to the first and second electrodes 15 and 16 of the arc tube 1 when the cumulative lighting time is short. That is, it is relatively increased with respect to the power supplied to. Such a relative increase amount can be evaluated as a triangular wave jumping rate C2 / C0. FIG. 9C is a diagram illustrating the supply of alternating current to the arc tube 1 having a long cumulative lighting time, that is, used to some extent during a steady operation period. In this case, a superimposed wave is supplied to the arc tube 1, and the average current value is maintained at C0, but the peak value of the superimposed wave is C3. Here, the triangular wave jumping rate C3 / C0 of the superimposed wave is higher than the jumping rate C2 / C0 of FIG. 9B. Thereby, even if the cumulative lighting time of the arc tube 1 is increased and the first electrode and the second electrodes 15 and 16 are further deteriorated, the sizes of the tips 15a and 16a can be maintained.

  The driving waveform at the time of steady operation is obtained by superimposing a triangular wave on a rectangular wave to achieve a desired triangular wave jumping rate. This is to promote the growth and maintenance of the tip portions 15a and 16a by increasing the power value in the second half region in the half cycle of AC driving. The effect of increasing the power value in the latter half of the half cycle of AC driving was confirmed experimentally. Further, it has been experimentally confirmed that when the lighting time becomes long and the first electrode 15 and the second electrode 15 and 16 are consumed, the protrusions are difficult to grow. For this reason, as the cumulative lighting time of the arc tube 1 increases, that is, as the exhaustion state progresses, the growth of the tips 15a and 16a can be maintained by increasing the power in the second half region in the half cycle of AC driving. I am doing so.

  FIG. 10 is a flowchart for explaining the operation of the light source driving device 70. Before starting lighting after the power is turned on, the control device 70b reads the setting information of the data storage unit 76 and checks whether or not the normal operation mode is set (step S11). When the normal operation mode is set, the control device 70b determines the state of the arc tube 1 (the stage of deterioration of the arc tube 1) by checking the cumulative lighting time measured by the timer 77 ( Step S12). Specifically, the degradation state of the arc tube 1 is divided into five stages based on the cumulative lighting time. The first stage ranges from 0 to 100 hours, the second stage ranges from 101 to 300 hours, the third stage ranges from 301 to 1000 hours, and the fourth stage ranges from 100 to 3000. It is a range of time, and the fifth stage is a range of 3001 hours or more. In addition, said state division is an example, and it cannot be overemphasized that a setting can be suitably changed according to the kind and application of the arc_tube | light_emitting_tube 1. FIG. Such a determination result of the state classification is stored in a specific area of the data storage unit 76 as state classification information.

  Next, the control device 70b reads out the operation condition corresponding to the state classification information determined in step S12, that is, the data corresponding to the deterioration stage of the arc tube 1 from the drive control table stored in the data storage unit 76 (step S13). ). A plurality of sets of correspondence data corresponding to each state classification includes a plurality of initial power supply conditions and a plurality of steady power supply conditions. The former initial power supply conditions further include power supply conditions at start-up and power supply at start-up. Including the conditions. Table 1 below shows an example of the drive control table.

  In the case of this drive control table, the current value supplied to the arc tube 1 is matched with the progress of deterioration of the arc tube 1 in the first to fifth stages as the start-time power supply condition among the initial power supply conditions during the start operation. It is gradually reduced to 2.5A to 2.0A. In addition, at the end of the start-up operation, as a start-up power supply condition among the initial power supply conditions, a current value supplied to the arc tube 1 is set to 3 in accordance with the progress of deterioration of the arc tube 1 in the first to fifth stages. It is gradually increased from 6A to 3.8A. Further, during the steady operation period, as a steady power supply condition, the jump rate of the triangular wave supplied to the arc tube 1 is gradually increased from 0% to 30% in accordance with the progress of deterioration of the arc tube 1 in the first to fifth stages. Has increased. For example, when it is determined that the arc tube 1 is in the first state, the current value at the start operation is set to 2.5 A, the current value at the end of the start-up operation is set to 3.6 A, and during the steady operation period The operating condition, that is, the corresponding data, for setting the triangular wave jump rate of the supplied current to 0% is read out.

  Next, the control device 70b controls the operation state of the lighting device 70a, that is, the driving of the arc tube 1 based on the correspondence data regarding the start operation read out in step S13 (step S14). Specifically, for example, when the state classification is the first stage where the stage of deterioration of the arc tube 1 is the lowest, as the operation at the start operation, an alternating current of 2.5 A is supplied to the arc tube 1 to A normal discharge is generated between the two electrodes 15 and 16. At this time, the frequency of the alternating current is set to several tens to several hundreds Hz, and the start-up operation is continued for 2 to 3 seconds. The frequency and duration of the alternating current during the starting operation can be fixed, but by including them in the operating conditions shown in Table 1, the settings can be changed as the state classification changes.

  Next, the control device 70b controls the operation state of the lighting device 70a, that is, the driving of the arc tube 1 based on the correspondence data regarding the start-up operation read out in step S13 (step S15). Specifically, for example, in the case where the state classification is the first stage where the stage of deterioration of the arc tube 1 is the lowest, as an initial operation of startup, an alternating current of about 3.0 A is supplied to the arc tube 1 to Light emission between the second electrodes 15 and 16 is allowed to reach a steady state in a short time. At this time, the frequency of the alternating current is set to 50 to 300 Hz, and the startup operation is continued until the rated power is reached. The frequency of the alternating current during the start-up operation can be fixed, but by including it in the operation conditions shown in Table 1, the setting can be changed in accordance with the change in the state category. Further, as an operation at the end of the start-up operation, an alternating current of about 3.6 A is supplied to the arc tube 1 to melt the irregularities 61 formed on the first and second electrodes 15 and 16, thereby leading the end portions 15a and 16a. Promote growth. The current value increase / decrease pattern at the end of the start-up operation can be, for example, to increase the current value for about 1 second with a constant slope and gradually decrease the current value after reaching the maximum value. Such an increase / decrease pattern of the current value can be fixed, but by including it in the operating conditions of Table 1, the setting can be changed in accordance with the change of the state classification.

  Next, the control device 70b controls the operation state of the lighting device 70a, that is, the driving of the arc tube 1 based on the correspondence data relating to the steady operation period read out in step S13 (step S16). Specifically, for example, in the case where the state classification is the first stage where the stage of deterioration of the arc tube 1 is the lowest, an alternating current of a rectangular wave with a triangular wave jumping rate of 0% is given to the arc tube 1 as an operation during the steady operation period. This is supplied to cause normal discharge between the first and second electrodes 15 and 16. At this time, power of, for example, about 170 W is supplied between the first and second electrodes 15 and 16. For example, when the state division is in the second stage, an alternating current of a superimposed wave with a triangular wave jumping rate of 10% is supplied to the arc tube 1 so that the growth of the tip portions 15a and 16a is slightly promoted. In addition, the triangular wave jumping rate of the alternating current is not limited to that fixed at each stage, but can be periodic. Specifically, it is possible to alternately supply a plurality of types of waveforms having different angular wave jumping rates between the first and second electrodes 15 and 16, and in this case, the average triangular wave jumping rate is deteriorated. It only needs to increase according to the stage.

  On the other hand, when it is determined in step S11 that the normal operation mode is not set, the control device 70b reads the operation condition, that is, special data from the special mode table stored in the data storage unit 76 (step S23). The special mode table defines, for example, a full repair process of the first and second electrodes 15 and 16. For example, the tip portions 15a and 16a are completely melted and smoothed at the end of the startup operation, and the tip portions 15a and 16a are gradually grown on the flat end surfaces of the main body portions 15b and 16b at the start of the steady operation period. For this reason, the special data in the special mode table stores setting information such as the increment of the current value at the end of the start-up operation, and the increase / decrease amount of the current value during the steady operation period, the triangular wave jumping rate of the superimposed wave Various setting information such as duty ratio and frequency is stored.

  Next, the control device 70b controls the operation state of the lighting device 70a, that is, the lighting start of the arc tube 1 based on the correspondence data regarding the starting operation read out in step S23 (step S24).

  Next, the control device 70b controls the operation state of the lighting device 70a, that is, the lighting state of the arc tube 1 based on the correspondence data regarding the start-up operation read out in step S23 (step S25).

  Next, the control device 70b controls the operation state of the lighting device 70a, that is, the lighting state of the arc tube 1 based on the correspondence data regarding the steady operation period read out in step S23 (step S26).

  As described above, the operation in the special mode is performed, and the repairing process for the first and second electrodes 15 and 16 is executed. The operation in the special mode is periodically performed or temporarily performed at the user's discretion, and is canceled when the repair process is completed, and then returns to the normal operation mode (step S27). When returning to the normal operation mode, a steady operation corresponding to step S16 is performed.

  In the above example, the drive control table stored in the data storage unit 76 has five stages of deterioration stages of the arc tube 1 based on the accumulated lighting time as a criterion (see Table 1). The deterioration stage of the arc tube 1 can be classified into five stages based on the voltage values during the steady operation of the first and second electrodes 15 and 16. Specifically, the detection output of the voltage sensor 78 is stored in the data storage unit 76 before the light is turned off during the previous operation, and the arc tube is referred to the voltage data stored in the data storage unit 76 before the start of the current operation. 1 is determined (step S12). Table 2 below shows an example of a drive control table based on voltage data.

  In the case of this drive control table, the first stage with the lowest deterioration stage of the arc tube 1 is in the range of 0 to 65V, the second stage is in the range of 66 to 75V, and the third stage is in the range of 76 to The range is 90V, the fourth stage is a range of 91 to 100V, and the fifth stage is a range of 101V or more. Also in this drive control table, the value of the current supplied to the arc tube 1 during the starting operation is gradually decreased in accordance with the progress of the first to fifth stages, and is supplied to the arc tube 1 at the end of the start-up operation. The value of the current is gradually increased as the first to fifth stages progress. Further, during the steady operation period, the triangular wave jumping rate of the superimposed wave supplied to the arc tube 1 is gradually increased as the first to fifth stages progress.

  As is clear from the above description, in the light source device 100 of the present embodiment, the control device 70b selects any one of the operation conditions selected from the plurality of operation conditions according to the determination result of the state classification of the arc tube 1, specifically, The initial operation of starting and starting is performed by adjusting the value of the current supplied to the arc tube 1 (steps S14 and S15), and the steady operation is performed by adjusting the triangular wave jumping rate of the superimposed wave supplied to the arc tube 1. Therefore (step S16), an appropriate operation according to the variation of the state classification of the arc tube 1 is ensured. Therefore, the luminous state of the arc tube 1 can be maintained in a good state with little flicker for a long period of time, and the life of the arc tube 1 can be extended. In the case of this embodiment, in Tables 1 and 2, the power supply conditions at the start of the initial operation, at the start-up operation of the initial operation, and at the steady operation in the switching of the first to fifth stages Are not necessarily changed at the same time, but this is suitable for the respective power supply conditions at the start-up operation of the initial operation, the startup operation of the initial operation, and the steady operation with respect to the deterioration state of each arc tube 1 It is because it is set to.

  FIG. 11 is a conceptual diagram for explaining the structure of a projector incorporating the light source device 100 of FIG. The projector 200 includes a light source device 100, an illumination optical system 20, a color separation optical system 30, liquid crystal light valves 40a, 40b, and 40c, a cross dichroic prism 50, and a projection lens 60. The three liquid crystal light valves 40a, 40b, and 40c as a whole constitute a light modulation unit.

  In the projector 200, the light source device 100 includes the light source unit 10 shown in FIG. 1 and the light source driving device 70, and illumination for illuminating the liquid crystal light valves 40a, 40b, and 40c via the illumination optical system 20 and the like. Generate light.

  The illumination optical system 20 includes a collimating lens 22 that collimates the light beam direction of the light source light, first and second fly-eye lenses 23a and 23b that constitute an integrator optical system for dividing and superimposing light, A polarization conversion element 24 that aligns the polarization direction of the light, a superimposing lens 25 that superimposes the light that has passed through both fly-eye lenses 23a and 23b, and a mirror 26 that bends the optical path of the light, and makes the substantially white illumination uniform. Form light. In the illumination optical system 20, the collimating lens 22 converts the luminous flux direction of the illumination light emitted from the light source unit 10 to be substantially parallel. The first and second fly-eye lenses 23a and 23b are each composed of a plurality of element lenses arranged in a matrix, and the light that has passed through the collimating lens 22 is divided by the element lenses that constitute the first fly-eye lens 23a. The light beams are individually condensed, and the divided light beams from the first fly-eye lens 23a are emitted with an appropriate divergence angle by the element lenses constituting the second fly-eye lens 23b. The polarization conversion element 24 is formed of an array having a PBS, a mirror, a retardation plate, etc. as a set of elements, and the polarization direction of each partial light beam divided by the first fly-eye lens 23a is linearly polarized in one direction. It has a role to align. The superimposing lens 25 appropriately converges the illumination light that has passed through the polarization conversion element 24 as a whole, and enables superimposing illumination on the illuminated areas of the liquid crystal light valves 40a, 40b, and 40c, which are the light modulators for the subsequent stages.

  The color separation optical system 30 includes first and second dichroic mirrors 31a and 31b, reflection mirrors 32a, 32b, and 32c, and three field lenses 33a, 33b, and 33c, and is made uniform by the illumination optical system 20. The illumination light is separated into three colors of red (R), green (G), and blue (B), and each color light is guided to the liquid crystal light valves 40a, 40b, and 40c at the subsequent stage. More specifically, first, the first dichroic mirror 31a transmits R light and reflects G light and B light among the three colors of RGB. The second dichroic mirror 31b reflects G light and transmits B light out of the two colors of GB. Next, in the color separation optical system 30, the R light transmitted through the first dichroic mirror 31a enters the field lens 33a for adjusting the incident angle through the reflection mirror 32a. Further, the G light reflected by the first dichroic mirror 31a and further reflected by the second dichroic mirror 31b is incident on the field lens 33b for adjusting the incident angle. Further, the B light that has passed through the second dichroic mirror 31b enters the field lens 33c for adjusting the incident angle via the relay lenses LL1 and LL2 and the reflection mirrors 32b and 32c.

  The liquid crystal light valves 40 a, 40 b, and 40 c are non-light-emitting light modulation devices that modulate the spatial intensity distribution of incident illumination light, and are illuminated corresponding to each color light emitted from the color separation optical system 30. Three liquid crystal panels 41a, 41b, 41c, three first polarizing filters 42a, 42b, 42c arranged on the incident side of each liquid crystal panel 41a, 41b, 41c, and each liquid crystal panel 41a, 41b, 41c. Three second polarizing filters 43a, 43b, and 43c are provided on the exit side. The R light transmitted through the first dichroic mirror 31a enters the liquid crystal light valve 40a via the field lens 33a and the like, and illuminates the liquid crystal panel 41a of the liquid crystal light valve 40a. The G light reflected by both the first and second dichroic mirrors 31a and 31b enters the liquid crystal light valve 40b via the field lens 33b and the like, and illuminates the liquid crystal panel 41b of the liquid crystal light valve 40b. The B light reflected by the first dichroic mirror 31a and transmitted through the second dichroic mirror 31b enters the liquid crystal light valve 40c via the field lens 33c and the like, and illuminates the liquid crystal panel 41c of the liquid crystal light valve 40c. Each of the liquid crystal panels 41a to 41c modulates the spatial intensity distribution in the polarization direction of the incident illumination light, and the three colors of light incident on the liquid crystal panels 41a to 41c are electrically transmitted to the liquid crystal panels 41a to 41c. The polarization state is adjusted in units of pixels in accordance with the drive signal or image signal input as. At this time, the polarization direction of the illumination light incident on the liquid crystal panels 41a to 41c is adjusted by the first polarizing filters 42a to 42c, and the light is emitted from the liquid crystal panels 41a to 41c by the second polarizing filters 43a to 43c. Modulated light having a predetermined polarization direction is extracted from the modulated light. As described above, each liquid crystal light valve 40a, 40b, 40c forms image light of each color corresponding to each.

  The cross dichroic prism 50 combines the image light of each color from the liquid crystal light valves 40a, 40b, and 40c. More specifically, the cross dichroic prism 50 has a substantially square shape in plan view in which four right angle prisms are bonded together, and a pair of dielectric multilayer films intersecting in an X shape at the interface where the right angle prisms are bonded to each other. 51a and 51b are formed. One first dielectric multilayer film 51a reflects R light, and the other second dielectric multilayer film 51b reflects B light. The cross dichroic prism 50 reflects the R light from the liquid crystal light valve 40a by the dielectric multilayer film 51a and emits the G light from the liquid crystal light valve 40b through the dielectric multilayer films 51a and 51b. The B light from the liquid crystal light valve 40c is reflected by the dielectric multilayer film 51b and emitted to the left in the traveling direction. In this way, the R light, the G light, and the B light are combined by the cross dichroic prism 50 to form combined light that is image light based on a color image.

  The projection lens 60 is a projection optical system, and projects the color image on a screen (not shown) by enlarging the image light by the combined light formed through the cross dichroic prism 50 with a desired magnification.

  In addition, this invention is not restricted to said embodiment, In the range which does not deviate from the summary, it can implement in a various aspect, For example, the following deformation | transformation is also possible.

  For example, in the above-described embodiment, only the switching of the operation conditions related to the initial operation and the steady operation has been described. However, even when the arc tube 1 is turned off, the arc tube 1 is based on the accumulated lighting time or the voltage data during lighting. The operating conditions such as the current value to be supplied to and the triangular wave jumping rate can be switched.

  Moreover, in the said embodiment, although switching of operating conditions, such as a current value supplied to the arc_tube | light_emitting_tube 1, and a triangular wave jumping rate, is performed based on accumulation lighting time or the voltage data at the time of lighting, the illumination intensity of the arc_tube | light_emitting tube 1 is changed. It is also possible to monitor with a photosensor such as a PD, and to switch operation conditions such as a current value and a triangular wave jumping rate based on such a monitoring result.

  In the above embodiment, the current value supplied to the arc tube 1, the triangular wave jumping rate, and the like are used as the operating conditions, and switching to another operating condition according to the state classification is performed. It is also possible to switch to other operating conditions including the above. For example, when the frequency is lowered, the power supplied in the second half of the half cycle of the AC power relatively increases. Further, when the duty ratio on the anode side is increased, the power supplied in the second half of the half cycle of the AC power is relatively increased.

  In the light source device described above, various lamps such as a high-pressure mercury lamp and a metal halide lamp can be considered as lamps used in the light source unit 10.

  Further, in the projector 200 of the above embodiment, a pair of fly-eye lenses 23a and 23b is used to divide the light from the light source device 100 into a plurality of partial light beams. That is, the present invention can be applied to a projector that does not use a lens array. Furthermore, the fly-eye lenses 23a and 23b can be replaced with rod integrators.

  Further, in the projector 200, the polarization conversion element 24 that converts the light from the light source device 100 into a specific direction of polarization is used. However, the present invention is also applicable to a projector that does not use such a polarization conversion element 24. is there.

  In the above embodiment, an example in which the present invention is applied to a transmissive projector has been described. However, the present invention can also be applied to a reflective projector. Here, “transmission type” means that a liquid crystal light valve including a liquid crystal panel transmits light, and “reflection type” means that the liquid crystal light valve reflects light. It means that there is. The light modulation device is not limited to a liquid crystal panel or the like, and may be a light modulation device using a micromirror, for example.

  Further, as the projector, there are a front projector that projects an image from the direction of observing the projection surface and a rear projector that projects an image from the side opposite to the direction of observing the projection surface. The projector configuration shown in FIG. Is applicable to both.

  In the above-described embodiment, only the example of the projector 200 using the three liquid crystal panels 41a to 41c has been described. However, the present invention is a projector using only one liquid crystal panel, a projector using two liquid crystal panels, Or it is applicable also to the projector using four or more liquid crystal panels.

  In the above-described embodiment, light modulation of each color is performed using the color separation optical system 30 and the liquid crystal light valves 40a, 40b, 40c, etc., but instead, for example, by the light source device 100 and the illumination optical system 20 By using a combination of an illuminated color wheel and a device that is configured by pixels of a micromirror and irradiated with light transmitted through the color wheel, color light modulation and synthesis can be performed.

  DESCRIPTION OF SYMBOLS 1 ... Arc tube, 2 ... Reflector, 3 ... Secondary mirror, 10 ... Light source unit, 11 ... Main part, 12 ... Discharge space, 13 ... 1st sealing part, 14 ... 2nd sealing part, 15, 16 ... Electrode 15a, 16a ... tip part, 15b, 16b ... main body part, 15c, 16c ... coil part, 15d, 16d ... core rod, 15g, 16g ... tip side region, 17a, 17b ... metal foil, 18a, 18b ... lead wire 20 ... illumination optical system, 22 ... collimating lens, 23a, 23b ... fly-eye lens, 24 ... polarization conversion element, 25 ... superimposing lens, 26 ... mirror, 30 ... color separation optical system, 31a, 31b ... dichroic mirror, 40a, 40b, 40c ... liquid crystal light valve, 41a, 41b, 41c ... liquid crystal panel, 50 ... cross dichroic prism, 60 ... projection lens 61: Concavity and convexity, 63: Concavity and convexity, 65: Needle-like crystal, 70: Light source driving device, 70a: Lighting device, 70b: Control device, 74: Drive control unit, 75 ... Determination unit, 76 ... Data storage unit, 77 ... Timer 78 ... Voltage sensor, 100 ... Light source device, 200 ... Projector, OA ... System optical axis.

Claims (4)

An arc tube having a first electrode and a second electrode that emit light by discharge between each other;
The initial operation of supplying energy to the first electrode and the second electrode in a steady operation for supplying steady energy to the first electrode and the second electrode, and an operation different from the steady operation before performing the steady operation. A drive unit that performs the operation;
A determination unit for determining a state of the arc tube;
A plurality of initial power supply conditions provided corresponding to the state of the arc tube as the mode of the initial operation, and a plurality of steady power supply conditions provided corresponding to the state of the arc tube as the mode of the steady operation And a data storage unit for storing
The drive unit performs the initial operation under any condition selected from the plurality of initial power supply conditions according to the determination result by the determination unit, and the plurality of steady power supply according to the determination result by the determination unit There line the steady operation in any of the conditions selected from conditions,
The plurality of initial power supply conditions include a plurality of stages corresponding to the determination result by the determination unit,
When switching the initial operation according to the determination result by the determination unit, the supply energy supplied to each of the first electrode and the second electrode is changed,
The initial operation includes a startup operation performed after the start operation,
The plurality of initial power supply conditions correspond to a plurality of stages of deterioration of the arc tube,
The initial use corresponding to the stage where the deterioration of the arc tube is higher than the amount of increase in the current value at the end of the initial operation during the start-up operation period of the initial operation corresponding to the low stage of the arc tube A light source device in which the increase amount of the current value in the power supply condition is larger .   The light source device according to claim 1, wherein the drive unit individually switches the initial operation and the steady operation according to a determination result by the determination unit. The plurality of initial power supply conditions correspond to a plurality of stages of deterioration of the arc tube,
The initial power supply condition corresponding to the stage where the deterioration of the arc tube is higher than the current value during the start operation period provided at the beginning of the initial operation of the initial power supply condition corresponding to the stage where the deterioration of the arc tube is low The light source device according to claim 1 , wherein the current value is smaller. The light source device according to any one of claims 1 to 3 ,
A light modulation device illuminated by illumination light from the light source device;
A projector comprising: a projection optical system that projects an image formed by the light modulation device.

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