JP2010212116A - Lighting device, lamp unit, and projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting device capable of reducing the number of lamp exchanges and restraining fluctuations of brightness, to provide a lamp unit used for the lighting device, and to provide a projector using the lighting device. <P>SOLUTION: In the lighting device 1 having a plurality of lamp units 100-1, 100-2 respectively including lamps, a voltage detection unit for detecting drive voltage of respective lamps, and a control unit 200 for selecting at least one of lamps 90-1, 90-2, respective lamp units 100-1, 100-2 include memories 92-1, 92-2 for memorizing drive voltage of the lamp detected by the voltage detection unit when lighting-up, and the control unit 200 selects a lamp for lighting up on the basis of the drive voltage of the lamp memorized in the memories 92-1, 92-2. Preferably, the control unit 200 may preferentially select the lamp wherein the drive voltage of the lamp memorized in the memories 92-1, 92-2 is smaller. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting device, a lamp unit, and a projector.

  A projection type display device (projector) having a plurality of light sources (lamps) and capable of selectively lighting them is known.

JP-A-8-36180

  Since each lamp has a lifetime, it is necessary to replace the lamp in order to continue using the apparatus using the lamp. In order to reduce the number of lamp replacements, it is desirable to preferentially light a lamp having a long remaining life. Further, it is not preferable that the brightness is significantly different from the previous lighting every time the lamp is selectively lit.

  However, the lifespan of the lamps varies depending on the individual differences of the lamps themselves and the usage status of each lamp. Therefore, even if the accumulated lighting time is short, the remaining life is not always long.

  Similarly, the brightness of the lamp varies depending on the individual difference of the lamp itself and the use situation of each lamp. Therefore, a shorter integrated lighting time is not always brighter.

  The present invention has been made in view of the above problems, and provides an illumination device, a lamp unit, and a projector that can reduce the number of lamp replacements and can suppress fluctuations in brightness. For the purpose.

  An illumination device according to the present invention includes a plurality of lamp units each including a lamp, a voltage detection unit that detects a driving voltage of each of the lamps, and a control unit that selects at least one of the lamps. Each of the lamp units includes a storage unit that stores the drive voltage of the lamp detected by the voltage detection unit at the time of previous lighting, and the control unit stores the drive voltage of the lamp stored in each of the storage units. Based on the above, the lamp to be lit is selected.

  According to the present invention, it is possible to select a lamp to be lit according to the driving voltage of the lamp. As a result, a lamp having a long remaining life can be preferentially lit, so that an illumination device that can reduce the number of lamp replacements can be realized. In addition, since a lamp having a brightness similar to that at the time of previous lighting is selected, fluctuations in brightness due to a difference in lamps to be used can be suppressed.

  In the illumination device, the control unit may preferentially select the lamp having a smaller driving voltage of the lamp stored in the storage unit.

  In this lighting device, the control unit may update the driving voltage of the lamp stored in the storage unit for each predetermined period during lighting of the lamp.

  In this illumination device, the control unit may update the lamp driving voltage stored in the storage unit with the driving voltage of the lamp immediately before turning off.

  In this lighting device, the lamp unit may be configured to be detachable from the lighting device.

  The lamp unit according to the present invention is any one of these lamp units.

  The projector according to the present invention includes any one of these illumination devices.

The circuit block diagram of the illuminating device which concerns on this embodiment. The disassembled perspective view which shows an example of a structure of a lamp unit. The circuit diagram which shows an example of a structure of a lighting drive device. The flowchart from lighting operation in this embodiment to a lamp lighting start. 6 is a flowchart from a turn-off operation to lamp turn-off in the present embodiment. FIG. 3 is a diagram illustrating an example of a configuration of a projector according to the present embodiment.

  DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. The embodiments described below do not unduly limit the contents of the present invention described in the claims. Also, not all of the configurations described below are essential constituent requirements of the present invention.

1. Illumination Device FIG. 1 is a circuit block diagram of the illumination device according to the present embodiment.

  Lighting device 1 according to the present embodiment includes a plurality of lamp units. Each lamp unit includes a lamp and a storage unit.

  In the present embodiment, the lighting device 1 includes a lamp unit 100-1 including a lamp 90-1 and a storage unit 92-1, and a lamp unit 100-1 including a lamp 90-2 and a storage unit 92-2. The two lamp units are included. For the lamps 90-1 and 90-2, for example, a discharge lamp such as a high-pressure mercury lamp or a metal halide lamp may be used.

  In the description of the present embodiment, a case where the lighting device 1 includes two lamp units will be described. However, the lighting device 1 may include three or more lamp units. The lamp units 100-1 and 100-2 may be configured to be detachable from the lighting device 1.

  FIG. 2 is an exploded perspective view showing an example of the configuration of the lamp unit 100-1. In FIG. 2, the emission direction of the light beam emitted from the lamp unit 100-1 is defined as the + Z direction. The configuration of the lamp unit 100-2 is the same.

  A lamp unit 100-1 illustrated in FIG. 2 includes a lamp 90-1, a storage unit 92-1, an elliptical reflector 102, and a lamp housing 106.

  The elliptical reflector 102 includes a cylindrical neck portion 118 into which one sealing portion on the base end side of the lamp 90-1 is inserted, and an elliptical curved reflection portion 120 extending from the neck portion 118. . For example, the elliptical reflector 102 may be manufactured by being integrally formed of translucent glass. Moreover, the reflection part 120 of the elliptical reflector 120 may have a reflective surface which becomes a cold mirror that reflects visible light and transmits infrared rays and ultraviolet rays. The reflective surface may be manufactured, for example, by depositing a metal thin film on an elliptically curved glass surface.

  An opening 116 is formed in the lamp housing 106, and the collimating concave lens 104 is provided in the opening 116. The light beam emitted from the lamp 90-1 is emitted from the planar concave lens 104 directly or after being reflected by the reflection surface of the reflection unit 120.

  The elliptical reflector 120 and the lamp housing 106 are in contact with each other with the elastic member 114 interposed therebetween, and the pair of shafts 108 are inserted into the shaft insertion holes 110 and 112 so that the elliptical reflector 120 and the lamp housing 106 are connected. .

  The storage unit 92-1 is provided in a part of the lamp housing 106, and is configured to be readable and writable from the control unit 200 described later via a wiring (not shown). The storage unit 92-1 and the control unit 200 may communicate by serial communication using, for example, a UART (Universal Asynchronous Receiver Transmitter). The storage unit 92-1 drives the driving voltage Vla1 of the lamp 90-1 detected by the voltage detecting unit 61 described later when the lamp 90-1 was previously turned on (during stable driving when the lamp is stably lit). Store as information. The storage unit 92-1 may store the drive voltage Vla1 of the lamp 90-1 detected in the inspection process of the lighting device 1 as an initial value of the drive voltage information.

  The storage unit 92-1 may be configured with a nonvolatile memory. By configuring with a nonvolatile memory, drive voltage information can be retained even when power is not supplied to the storage unit 92-1.

  Lighting device 1 according to the present embodiment may include lighting drive devices 10-1 and 10-2 corresponding to lamps 90-1 and 90-2, respectively. The lighting driving device 10-1 generates a driving current for driving the lamp 90-1, and supplies the driving current to the lamp 90-1, thereby driving the lamp 90-1. The lighting driving device 10-2 generates a driving current for driving the lamp 90-2 and supplies the driving current to the lamp 90-2 to drive the lamp 90-2.

  Further, the lighting drive devices 10-1 and 10-2 communicate with a control unit 200, which will be described later, and receive a lighting command and a lighting command for the lamps 90-1 and 90-2, respectively. The lighting drive devices 10-1 and 10-2 turn on the lamps 90-1 and 90-2, respectively, based on the lighting command (start lighting driving), and each of the lamps 90-1, 90-2 based on the light-off command. Is turned off (lighting drive ends).

  The lighting driving devices 10-1 and 10-2 and the control unit 200 may communicate with each other by, for example, serial communication using a UART (Universal Asynchronous Receiver Transmitter).

  FIG. 3 is a circuit diagram showing an example of the configuration of the lighting drive device 10-1. The configuration of the lighting drive device 10-2 is the same.

  The lighting drive device 10-1 includes a power control circuit 20. The power control circuit 20 generates driving power to be supplied to the lamp 90-1. In the present embodiment, the power control circuit 20 includes a down chopper circuit that receives the DC power supply 80 and steps down the input voltage to output a DC current Id.

  The power control circuit 20 can be configured to include a switch element 21, a diode 22, a coil 23, and a capacitor 24. The switch element 21 can be composed of, for example, a transistor. In the present embodiment, one end of the switch element 21 is connected to the positive voltage side of the DC power supply 80, and the other end is connected to the cathode terminal of the diode 22 and one end of the coil 23. One end of a capacitor 24 is connected to the other end of the coil 23, and the other end of the capacitor 24 is connected to the anode terminal of the diode 22 and the negative voltage side of the DC power supply 80. A current control signal is input from the lighting drive control unit 40 to the control terminal of the switch element 21 to control ON / OFF of the switch element 21. For example, a PWM (Pulse Width Modulation) control signal may be used as the current control signal.

  Here, when the switch element 21 is turned ON, a current flows through the coil 23 and energy is stored in the coil 23. Thereafter, when the switch element 21 is turned OFF, the energy stored in the coil 23 is released through a path passing through the capacitor 24 and the diode 22. As a result, a direct current Id corresponding to the proportion of time during which the switch element 21 is turned on is generated.

  The lighting drive device 10-1 includes an AC conversion circuit 30. The AC conversion circuit 30 receives the DC current Id output from the power control circuit 20, and generates a driving current I for driving a discharge lamp having an arbitrary duty ratio and frequency by inverting the polarity at a given timing. Output. In the present embodiment, the AC conversion circuit 30 is configured by an inverter bridge circuit (full bridge circuit).

  The AC conversion circuit 30 includes, for example, first to fourth switch elements 31 to 34 such as transistors, and the first and second switch elements 31 and 32 connected in series and the first switch elements 31 and 32 connected in series. The third and fourth switch elements 33 and 34 are connected in parallel to each other. An AC conversion control signal is input from the lighting drive control unit 40 to the control terminals of the first to fourth switch elements 31 to 34, and ON / OFF of the first to fourth switch elements 31 to 34 is controlled. The

  The AC conversion circuit 30 repeats ON / OFF of the first and fourth switch elements 31 and 34 and the second and third switch elements 32 and 33 alternately, thereby outputting the direct current output from the power control circuit 20. The polarity of the current Id is alternately inverted, and the frequency is controlled from the common connection point of the first and second switch elements 31 and 32 and the common connection point of the third and fourth switch elements 33 and 34. A drive current I is generated and output.

  That is, when the first and fourth switch elements 31 and 34 are ON, the second and third switch elements 32 and 33 are turned OFF, and when the first and fourth switch elements 31 and 34 are OFF, the second and third switch elements 31 and 34 are OFF. The third switch elements 32 and 33 are controlled to be turned on. Therefore, when the first and fourth switch elements 31 and 34 are ON, a drive current I that flows from one end of the capacitor 24 in the order of the first switch element 31, the lamp 90-1, and the fourth switch element 34 is generated. . In addition, when the second and third switch elements 32 and 33 are turned on, a drive current I that flows from one end of the capacitor 24 in the order of the third switch element 33, the lamp 90-1, and the second switch element 32 is generated. .

  The lighting drive device 10-1 includes a lighting drive control unit 40. The lighting drive control unit 40 controls the current value, the duty ratio, the frequency, and the like of the drive current I by controlling the power control circuit 20 and the AC conversion circuit 30. The lighting drive control unit 40 performs AC conversion control for controlling the duty ratio, frequency, and the like with respect to the AC conversion circuit 30 at the polarity inversion timing of the drive current I. Further, the lighting drive control unit 40 performs current control for controlling the current value of the output direct current Id to the power control circuit 20.

  In addition, the lighting drive control unit 40 communicates with the control unit 200 by exchanging the communication signal S. The communication signal S may include a turn-on command and a turn-off command for the lamp 90-1, and drive voltage information corresponding to the drive voltage Vla1 of the lamp 90-1 detected by the voltage detection unit 65 described later.

  The configuration of the lighting drive control unit 40 is not particularly limited, but in the present embodiment, the lighting drive control unit 40 includes a system controller 41, a power control circuit controller 42, and an AC conversion circuit controller 43. ing. Note that a part or all of the lighting drive control unit 40 may be configured by a semiconductor integrated circuit.

  The system controller 41 controls the power control circuit 20 and the AC conversion circuit 30 by controlling the power control circuit controller 42 and the AC conversion circuit controller 43. The system controller 41 controls the power control circuit controller 42 and the AC conversion circuit controller 43 based on the drive voltage Vla and the drive current I detected by the operation detection unit 60 provided in the lighting drive device 10-1 described later. Good.

  In the present embodiment, the system controller 41 includes a built-in storage unit 44. The storage unit 44 may be provided independently of the system controller 41.

  The system controller 41 may control the power control circuit 20 and the AC conversion circuit 30 based on information stored in the built-in storage unit 44. The built-in storage unit 44 may store, for example, information related to driving parameters such as a holding time during which the driving current I continues with the same polarity, a current value of the driving current I, a duty ratio, a frequency, and a waveform.

  The power control circuit controller 42 controls the power control circuit 20 by outputting a current control signal to the power control circuit 20 based on the control signal from the system controller 41.

  The AC conversion circuit controller 43 controls the AC conversion circuit 30 by outputting an AC conversion control signal to the AC conversion circuit 30 based on the control signal from the system controller 41.

  The lighting drive control unit 40 can be realized by a dedicated circuit to perform the above-described various controls. For example, a CPU (Central Processing Unit) executes a control program stored in the internal storage unit 44 or the like. By doing so, it can function as a computer and perform these various controls.

  The lighting drive device 10-1 includes an operation detection unit 60. The operation detection unit 60 includes a voltage detection unit 65 that detects the drive voltage Vla of the lamp 90-1 and outputs drive voltage information, and a current detection unit that detects the drive current I and outputs drive current information. . In the present embodiment, the operation detection unit 60 includes first to third resistors 61 to 63.

  In the present embodiment, the voltage detection unit 65 detects the drive voltage Vla based on the voltage divided by the first and second resistors 61 and 62 connected in series with each other in parallel with the lamp 90-1. In the present embodiment, the current detection unit detects the drive current I based on the voltage generated in the third resistor 63 connected in series with the lamp 90-1.

  The lighting drive device 10-1 may include an igniter circuit 70. The igniter circuit 70 operates only at the start of lighting of the lamp 90-1, and at the start of lighting of the lamp 90-1, a high voltage (usually required for dielectric breakdown between the electrodes of the lamp 90-1 to form a discharge path. A voltage higher than that during the control operation) is supplied between the electrodes of the lamp 90-1. In the present embodiment, the igniter circuit 70 is connected in parallel with the lamp 90-1.

  The lighting device 1 according to the present embodiment selects at least one of a plurality of lamps (in the present embodiment, the lamps 90-1 and 90-2), and turns on the lamp in the lighting driving device corresponding to the selected lamp. The control part 200 which instruct | indicates is included. The control unit 200 instructs the lighting of the lamp 90-1 by outputting a lighting command to the lighting driving device 10-1 when the lamp 90-1 is selected, and lights up when the lamp 90-2 is selected. By instructing the lighting of the lamp 90-2 by outputting a lighting command to the driving device 10-2.

  Further, the control unit 200 may accept operation information such as a lighting operation and a light-off operation based on a user operation.

  The control unit 200 can be realized by a dedicated circuit to perform the above-described control and various types of control described later. For example, a CPU (Central Processing Unit) executes a control program stored in a storage device (not shown). By doing so, it is possible to function as a computer and perform various controls of these processes.

  The control unit 200 writes or updates the drive voltage Vla1 of the lamp 90-1 received from the lighting drive device 10-1 in the storage unit 92-1 as drive voltage information. Further, the control unit 200 writes or updates the drive voltage Vla2 of the lamp 90-2 received from the lighting drive device 10-2 in the storage unit 92-2 as drive voltage information. Moreover, the control part 200 can read the drive voltage information memorize | stored in the memory | storage parts 92-1 and 92-2.

  The control unit 200 selects a lamp to be lit based on drive voltage information corresponding to the drive voltage of each lamp. For example, the control unit 200 may preferentially select a lamp having a smaller driving voltage.

  The lamp driving voltage has a high correlation with the deterioration state of the lamp electrode. For example, in a discharge lamp, the lamp driving voltage tends to increase as the lamp electrode deteriorates. Therefore, it is possible to preferentially select a lamp having a long remaining life by preferentially selecting a lamp having a smaller driving voltage.

  When the lamp is driven with the same power, the lamp driving current decreases as the lamp driving voltage increases, and the brightness of the lamp also decreases. However, the driving voltage of the lamp does not always increase monotonously with time because of individual differences among the lamps.

  By preferentially selecting a lamp having a smaller lamp driving voltage, a lamp having a driving voltage close to the driving voltage of the lamp used at the time of previous lighting is selected. Therefore, it is possible to realize an illumination device that has a small change in brightness even when the selected lamp is changed.

  The storage units 92-1 and 92-2 are provided in the lamp units 100-1 and 100-2, respectively. Therefore, particularly when the lamp units 100-1 and 100-2 are configured to be detachable from the lighting device 1, even when the user replaces the lamp unit 100-1 or 100-2, the correct driving voltage information is used. The lamp that lights up can be selected.

  FIG. 4 is a flowchart from the lighting operation to the start of lamp lighting in the present embodiment.

  First, the control unit 200 receives a lighting operation from the user (step S100). Next, the control unit 200 reads drive voltage information from the storage units 92-1 and 92-2 (step S102).

  Next, the control unit 200 determines whether the drive voltage Vla1 and the drive voltage Vla2 correspond to the drive voltage information read in step S102 (step S104). If it is determined in step S104 that the drive voltage Vla1 is less than the drive voltage Vla2, a lighting command is transmitted to the lighting drive device 10-1 (step S108). The lighting drive device 10-1 that has received the lighting command starts lighting the lamp 90-1 (step S110).

  If it is determined in step S104 that the drive voltage Vla1 is equal to or higher than the drive voltage Vla2, a lighting command is transmitted to the lighting drive device 10-2 (step S112). The lighting drive device 10-2 that has received the lighting command starts lighting the lamp 90-2 (step S114).

  FIG. 5 is a flowchart from the turn-off operation to the lamp turn-off in the present embodiment.

  First, the control unit 200 receives a turn-off operation from the user (step S200). Next, the control part 200 reads drive voltage information from the lighting drive device corresponding to the lamp | ramp which is lighting (step S202). For example, when the lamp 90-1 is lit, drive voltage information is read from the lighting drive device 10-1.

  Next, the control unit 200 writes the drive voltage information read in step S202 in the storage unit (step S204).

  For example, when the lamp 90-1 is selected and turned on, the control unit 200 stores the drive voltage information corresponding to the drive voltage Vla1 of the lamp 90-1 immediately before turning off in the storage unit 92-1. The updated driving voltage information may be updated.

  Similarly, when the lamp 90-2 is selected and turned on, the control unit 200 stores the drive voltage information corresponding to the drive voltage Vla2 of the lamp 90-2 immediately before turning off in the storage unit 92-2. The stored drive voltage information may be updated.

  By storing the drive voltage information immediately before the lamp is turned off in the storage units 92-1 and 92-2, more appropriate lamp selection can be performed at the next lighting.

  Next, the control unit 200 transmits a turn-off command to the lighting drive device corresponding to the lamp that is turned on (step S206). For example, when the lamp 90-1 is lit, a turn-off command is transmitted to the lighting drive device 10-1. Note that step S206 may be performed between step S200 and step S202.

  Next, the lighting drive device that has received the turn-off command turns off the lamp (step S208).

  In the above-described example, the example in which the drive voltage information is written in the storage unit after receiving the turn-off operation has been described. However, it is also possible to update the drive voltage information stored in the storage unit for each predetermined period during lighting of the lamp. is there.

  For example, when the lamp 90-1 is selected and turned on, the control unit 200 drives the lamp 90-1 stored in the storage unit 92-1 every predetermined period while the lamp 90-1 is turned on. The drive voltage information corresponding to the voltage Vla1 may be updated.

  Similarly, when the lamp 90-2 is selected and turned on, the control unit 200 sets the lamp 90-2 stored in the storage unit 92-2 for each predetermined period while the lamp 90-2 is turned on. The drive voltage information corresponding to the drive voltage Vla2 may be updated.

  By updating the drive voltage information every predetermined period, relatively new drive voltage information can be secured even when drive voltage information corresponding to the drive voltage of the lamp immediately before turning off cannot be written.

2. Projector FIG. 6 is a diagram illustrating an example of a configuration of a projector according to the present embodiment. The projector 500 is an example of a projector including the lighting device 1 according to the above-described embodiment. In addition, the same code | symbol is attached | subjected to the structure same as the illuminating device 1 shown in FIG. 1, and detailed description is abbreviate | omitted.

  The projector 500 includes an image signal conversion unit 510, a DC power supply device 520, lighting driving devices 10-1 and 10-2, lamp units 100-1 and 100-2, a control unit 200, a mirror group 550, liquid crystal panels 560R and 560G, 560B and an image processing device 570. The lamp unit 100-1 includes a lamp 90-1 and a storage unit 92-1. The lamp unit 100-2 includes a lamp 90-2 and a storage unit 92-2. In the present embodiment, discharge lamps are used for the lamps 90-1 and 90-2.

  The image signal converter 510 converts an externally input image signal 502 (such as a luminance-color difference signal or an analog RGB signal) into a digital RGB signal having a predetermined word length to generate image signals 512R, 512G, and 512B. This is supplied to the image processing apparatus 570.

  The image processing device 570 performs image processing on the three image signals 512R, 512G, and 512B, and outputs drive signals 572R, 572G, and 572B for driving the liquid crystal panels 560R, 560G, and 560B, respectively.

  The DC power supply device 520 converts an AC voltage supplied from an external AC power supply 600 into a constant DC voltage, and an image signal conversion unit on the secondary side of a transformer (not shown, but included in the DC power supply device 520). 510, a DC voltage is supplied to the image processing device 570 and the lighting drive devices 10-1 and 10-2 on the primary side of the transformer.

  The lighting driving devices 10-1 and 10-2 generate a high voltage between the electrodes of the lamps 90-1 and 90-2 at the time of startup to cause a dielectric breakdown to form a discharge path, and thereafter the lamps 90-1 and 90- 2 supplies a driving current for maintaining the discharge. In the present embodiment, a lighting driving device having the same configuration as that of the lighting driving device 10-1 described with reference to FIG. 2 is used.

  The light beams emitted from the lamps 90-1 and 90-2 are separated into R, G, and B color lights through two dichroic mirrors included in the mirror group 550, respectively, and reflected by the other mirrors, respectively, and the liquid crystal panels 560R and 560G, respectively. 560B.

  The liquid crystal panels 560R, 560G, and 560B are light modulation units that form images based on the drive signals 572R, 572G, and 572B, respectively, and modulate the amount of color light transmitted through each liquid crystal panel by the images. Each color light modulated by the light modulation means is again synthesized by the dichroic prism and projected onto the screen 700.

  The control unit 200 controls the operation from the start of lighting of the projector to the turning off of the projector. When the projector 500 receives a lighting operation from the user, the driving voltage information stored in the storage units 92-1 and 92-2 is read via the communication signals 591 and 592 and turned on based on the read driving voltage information. The lamp is selected, and a lighting command is transmitted to the lighting driving device 10-1 or 10-2 via the communication signal 581 or 582. In addition, when the projector 500 receives a turn-off operation from the user, a turn-off command is transmitted via the communication signal 581 or 582 to the lighting drive device 10-1 or 10-2 corresponding to the lit lamp. In addition, the control unit 200 reads the driving voltage information of the lamps 90-1 and 90-2 from the lighting driving devices 10-1 and 10-2 via the communication signals 581 and 582, and stores the information via the communication signals 591 and 592. The drive voltage information is written in the units 92-1 and 92-2.

  The projector 500 configured as described above can select a lamp to be lit according to the driving voltage of the lamp. As a result, it is possible to preferentially turn on a lamp having a long remaining life, and thus a projector capable of reducing the number of lamp replacements can be realized. In addition, since a lamp having a brightness similar to that at the time of previous lighting is selected, fluctuations in brightness due to a difference in lamps to be used can be suppressed.

  The storage units 92-1 and 92-2 are provided in the lamp units 100-1 and 100-2, respectively. Therefore, in particular, when the lamp units 100-1 and 100-2 are configured to be detachable from the projector 500, even when the user replaces the lamp unit 100-1 or 100-2, based on the correct drive voltage information. A lamp to be lit can be selected.

  In each of the above embodiments, a projector using three liquid crystal panels has been described as an example. However, the present invention is not limited to this, and one, two, four or more liquid crystal panels are used. It can also be applied to projectors.

  In each of the above embodiments, the projector including the transmission type light modulation unit has been described as an example. However, the present invention is not limited to this, and the present invention is also applicable to a projector including the reflection type light modulation unit. Is possible. Here, the “transmission type” means that the electro-optic modulation device as the light modulation means, such as a transmission type liquid crystal panel, transmits light, and the “reflection type” This means that an electro-optic modulator as a light modulator such as a reflective liquid crystal panel or a micro mirror type light modulator is a type that reflects light. As the micromirror light modulator, for example, DMD (digital micromirror device; trademark of Texas Instruments) can be used. Even when the present invention is applied to a projector including a reflection type light modulation unit, the same effect as that of a projector including a transmission type light modulation unit can be obtained.

  In addition, this invention is not limited to this embodiment, A various deformation | transformation implementation is possible within the range of the summary of this invention.

  The present invention includes configurations that are substantially the same as the configurations described in the embodiments (for example, configurations that have the same functions, methods, and results, or configurations that have the same objects and effects). In addition, the invention includes a configuration in which a non-essential part of the configuration described in the embodiment is replaced. In addition, the present invention includes a configuration that exhibits the same operational effects as the configuration described in the embodiment or a configuration that can achieve the same object. Further, the invention includes a configuration in which a known technique is added to the configuration described in the embodiment.

  For example, in the above description, an example of a lighting device and a projector including two lamps has been described. However, a lighting device and a projector including three or more lamps may be used. Moreover, the illumination apparatus and projector which select and light two or more lamps out of three or more lamps may be used.

DESCRIPTION OF SYMBOLS 1 Illuminating device, 10-1, 10-2 lighting drive device, 20 electric power control circuit, 21 switch element, 22 diode, 23 coil, 24 capacitor, 30 AC converter circuit, 31-34 switch element, 40 lighting drive control part, 40-1 Current control unit, 40-2 AC conversion control unit, 41 System controller, 42 Power control circuit controller, 43 AC conversion circuit controller, 44 Built-in storage unit, 60 Operation detection unit, 61-63 Resistance, 65 Voltage detection unit , 70 igniter circuit, 80 DC power supply, 90-1, 90-2 lamp, 92-1, 92-2 storage unit, 100-1, 100-2 lamp unit, 102 elliptical reflector, 104 collimating concave lens, 106 lamp housing , 108 shafts, 110, 112 shaft insertion holes, 114 Elastic member, 116 aperture, 118 neck, 120 reflector, 200 controller, 500 projector, 502 image signal, 510 image signal converter, 512R image signal (R), 512G image signal (G), 512B image signal ( B), 520 DC power supply device, 550 mirror group, 560R liquid crystal panel (R), 560G liquid crystal panel (G), 560B liquid crystal panel (B), 570 image processing device, 572R liquid crystal panel (R) drive signal, 572G liquid crystal panel (G) Drive signal, 572B Liquid crystal panel (B) drive signal, 581,582,591,592 Communication signal, 600 AC power supply, 700 screen

Claims (7)

In an illuminating device having a plurality of lamp units each including a lamp, a voltage detection unit that detects a driving voltage of each of the lamps, and a control unit that selects at least one of the lamps,
Each of the lamp units includes a storage unit that stores a driving voltage of the lamp detected by the voltage detection unit at the time of previous lighting,
The said control part selects the said lamp to light based on the drive voltage of the said lamp | ramp memorize | stored in each said memory | storage part, The illuminating device characterized by the above-mentioned. The lighting device according to claim 1.
The control unit preferentially selects the lamp having a smaller driving voltage of the lamp stored in the storage unit. In the illuminating device in any one of Claim 1 and 2,
The said control part updates the drive voltage of the said lamp | ramp memorize | stored in the said memory | storage part for every predetermined period during the lighting of the said lamp | ramp. In the illuminating device in any one of Claims 1 thru | or 3,
The said control part updates the drive voltage of the said lamp | ramp memorize | stored in the said memory | storage part with the drive voltage of the said lamp immediately before light extinction. In the illuminating device in any one of Claims 1 thru | or 4,
The lamp unit is configured to be detachable from the lighting device.   The lamp unit according to any one of claims 1 to 5.   A projector comprising the illumination device according to claim 1.

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