JP2009204646A - Projector - Google Patents

Abstract

Disclosed is a projector having good color reproducibility by reducing light emission characteristics according to a substance sealed in a light emitting part of a discharge type light emitting tube.
A light source device, a light modulation device that modulates a light beam emitted from the light source device according to input image information to form an optical image, and the light modulation device. The light source device 2 includes a plurality of types of discharge-type arc tubes 211 and 221 having different emission characteristics.
[Selection] Figure 1

Description

  The present invention relates to a light source device, a light modulation device that modulates a light beam emitted from the light source device in accordance with input image information to form an optical image, and an optical image formed by the light modulation device. The present invention relates to a projector including a projection optical device for projecting.

Conventionally, a light source device, a light modulation device that modulates a light beam emitted from the light source device according to input image information to form an optical image, and an optical image formed by the light modulation device are projected. A projector having a projection optical device is used.
A discharge type arc tube is used for a light source device used in the projector. As the discharge type arc tube, a halogen lamp, a xenon lamp, an ultrahigh pressure mercury lamp, and the like are known.
This discharge-type arc tube has different emission characteristics depending on the substance enclosed in the light emitting part. For example, in the case of a metal halide lamp, it exhibits an emission characteristic with a small peak value of light in the wavelength of the blue region. If so, the light emission characteristic is small in the peak value of the light having the wavelength in the green region.
By the way, in order to increase the brightness of a projected image, a multi-lamp type projector in which a plurality of discharge-type arc tubes are incorporated in a light source device is known. An arc tube is used (see, for example, Patent Document 1).

JP 2001-2222064 A

However, since the multi-lamp projector described in Patent Document 1 forms a projected image with twice the normal light quantity, it is possible to achieve high brightness, but the same type discharge arc tube Therefore, there is a problem in that the influence of the light emission characteristics depending on the type of the discharge arc tube is increased.
That is, in the case of a multi-lamp projector using two metal halide lamps, the peak value of light with a wavelength in the blue region is small because the metal halide lamp has a small peak value with respect to light in other wavelength regions. It will be recognized by the observer as a projection image with little taste.

  It is an object of the present invention to provide a projector having good color reproducibility by reducing the light emission characteristics according to the substance enclosed in the light emitting part of the discharge arc tube.

The projector according to the present invention is
A light source device, a light modulation device that modulates a light beam emitted from the light source device according to input image information to form an optical image, and projection optics that projects an optical image formed by the light modulation device A projector comprising a device,
The light source device includes a plurality of types of discharge arc tubes having different emission characteristics.

Here, as the discharge-type arc tube, a halogen lamp, a metal halide lamp, a xenon lamp, an ultrahigh pressure mercury lamp, a high pressure mercury lamp, or the like can be adopted, and the light source device can be obtained by combining any two or more of these. Can be configured.
In addition, as the light modulation device, for example, a device using a micromirror can be employed in addition to a transmissive liquid crystal display device and a reflective liquid crystal display device.
According to the present invention, by using a plurality of types of discharge arc tubes having different emission characteristics in the light source device, a wavelength region having a small peak value of the emitted light from one type of discharge arc tube can be reduced to another type of discharge. Since it is possible to interpolate with the peak value of the radiated light of the type arc tube, a projector with good color reproducibility can be obtained.
In addition, since the light source device includes a plurality of types of discharge-type arc tubes, the light display range of the light source device itself is expanded. Therefore, the color of an area that cannot be expressed by color correction by image processing such as LUT (Look Up Table). Can be displayed.

In the present invention,
A plurality of light source driving devices for driving each discharge arc tube;
Control means for performing drive control of each light source driving device,
The control means includes
A light emission characteristic information storage unit for storing characteristic information on the light emission characteristic of each discharge arc tube;
A lighting state determination unit that determines whether or not the lighting state of each discharge arc tube is stable based on the characteristic information stored in the light emission characteristic information storage unit,
When the light source device is driven, the discharge type light emitting tube having the shortest time during which the lighting state is stabilized is given the maximum driving power, and the lighting state determination unit determines that the lighting state of the other discharge type light emitting tubes is stable. Then, it is preferable to include a drive power control unit that reduces the power applied to the discharge arc tube to which the maximum drive power is applied.

Here, as the information stored in the light emission characteristic information storage unit, the time until the lighting state is stabilized and the temperature of the discharge arc tube when the lighting state is stabilized can be considered.
In addition, the lighting state determination unit determines whether or not the lighting state of the discharge arc tube has been stabilized by measuring time from the start of driving by the time measuring means, and the lighting state stored in the light emission characteristic information storage unit is stabilized. The temperature of the discharge arc tube may be measured by a temperature sensor or the like, and the temperature of the stable discharge arc tube stored in the emission characteristic information storage unit may be determined. It may be measured depending on whether or not.
According to the present invention, at the initial stage of driving the light source device, by giving the maximum driving power to the discharge arc tube that has the shortest time for the lighting state to be stabilized, the discharge arc tube can emit light with the maximum light amount. Therefore, a bright projection image can be displayed at an early stage. And when the lighting state of the other discharge arc tube is stable, the power given to the discharge arc tube with the maximum driving power is reduced, and the light quantity of multiple types of discharge arc tubes is adjusted to optimize Color reproducibility can be realized.

In the present invention, it is preferable that one of the plurality of types of discharge arc tubes is a metal halide lamp and the other is an ultrahigh pressure mercury lamp.
According to the present invention, since the metal halide lamp and the ultra-high pressure mercury lamp are often used as the light source of the projector, a light source device including a plurality of types of discharge arc tubes can be easily configured.
In addition, the metal halide lamp has a small peak value of light in the blue wavelength region, the peak value of light in the green wavelength region is large, and the ultrahigh pressure mercury lamp has a large peak value of light in the blue wavelength region, and the peak of light in the green wavelength region. Since the value is small, it is possible to obtain a projector with good color reproducibility by an optimal combination.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[First Embodiment]
● １. Structure of Optical System FIG. 1 shows a projector 1 according to this embodiment. The projector 1 includes a light source device 2, a uniform illumination optical device 3, a color separation optical device 4, and a relay optical device 5. A light modulation device 6, a color synthesis optical device 7, and a projection optical device 8. The projector 1 modulates the light beam emitted from the light source device 2 according to image information input to the light modulation device 6 to form an optical image, and the projection optical device 8 forms a projection image on the screen SC. Form.
The light source device 2 includes a first light source lamp 21, a second light source lamp 22, a reflection mirror 23, and a collimating lens 24.

The first light source lamp 21 includes a discharge arc tube 211 and a reflector 212.
The discharge-type arc tube 211 is an ultra-high pressure mercury lamp, and has a pair of electrodes disposed therein, and a light emitting part in which a discharge space in which mercury is enclosed is formed, and extends in a direction away from each other across the light emitting part. And a pair of sealing portions each provided with an electrode lead wire connected to each electrode.
As shown in FIG. 2, the discharge arc tube 211 in which mercury is sealed has a large relative intensity of emitted light in a blue region of about 400 nm to 440 nm, and a relative intensity of a emitted light beam in a green region of about 475 nm to 530 nm. It has small light emission characteristics.
The reflector 212 is an optical element that reflects and converges the radiated light beam emitted from the discharge arc tube 211 to a predetermined position. In the present embodiment, an ellipsoidal reflector having a spheroid is adopted.

Similarly, the second light source lamp 22 includes a discharge arc tube 221 and a reflector 222.
However, a metal halide lamp is employed for the discharge arc tube 221 of the second light source lamp 22. The metal halide lamp employed as the discharge arc tube 221 has a light emitting part in which a discharge space in which a pair of electrodes are arranged is formed, as in the ultrahigh pressure mercury lamp, but is a substance enclosed in the light emitting part. However, in addition to mercury, metal halide is enclosed. Examples of the metal halide to be encapsulated include sodium iodide and scandium iodide.
As shown in FIG. 3, the discharge arc tube 221 has a light emission characteristic in which the relative intensity of the radiant light beam in the green region of about 490 nm to 590 nm is large and the relative intensity of the radiant light beam of the blue region of about 400 nm to 430 nm is small. is doing.

The luminous fluxes emitted from the discharge arc tubes 211 and 221 of the first light source lamp 21 and the second light source lamp 22 are directed to the reflection mirror 23 by the respective reflectors 212 and 222 as convergent luminous fluxes toward the focal point of the ellipsoid. And injected.
The reflection mirror 23 functions as a light guide device that bends the emitted light beams emitted from the first light source lamp 21 and the second light source lamp 22 and guides them to the parallelizing lens 24. The reflection angle of light by the reflection mirror 23 is guided to the collimating lens 24 so that the light beam emitted from the first light source lamp 21 and the light beam emitted from the second light source lamp are superimposed. Yes.
The collimating lens 24 collimates the convergent light beams emitted from the first light source lamp 21 and the second light source lamp 22 and emits them to the uniform illumination optical device 3.

The uniform illumination optical device 3 includes a first lens array 31, a second lens array 32, a polarization conversion element 33, and a superimposing lens 34.
The first lens array 31 and the second lens array 32 have a configuration in which corresponding small lenses are arranged in a matrix, and the first lens array 31 converts the light beam incident from the light source device 2 into a plurality of partial light beams. The image is divided and imaged in the vicinity of the second lens array 32.
The second lens array 32 has a plurality of lenses divided by the first lens array 31 on the image forming regions of the liquid crystal panels 61R, 61G, and 61B of the light modulation device 6 (to be described later) together with the superimposing lens 34 located at the latter stage of the optical path. A partial light beam is superimposed.

The polarization conversion element 33 is an optical element that converts the light beam emitted from the second lens array 32 into substantially one type of linearly polarized light beam.
This polarization conversion element 33 is a plate-like body formed by joining a plurality of prisms having a parallelogram cross section with one diagonal being 45 deg and the other diagonal being approximately 135 deg. Polarization separation films and total reflection mirrors are alternately deposited on the interface.
In addition, a plurality of half-wave retardation plates are provided at a predetermined pitch on the light exit surface of the polarization conversion element 33.

In such a polarization conversion element 33, when a light beam is incident on the surface on which the polarization separation film is formed, one of the two types of linearly polarized light beams is transmitted as it is and emitted, and the other polarized light beam is emitted. Is bent at a substantially right angle by the polarization separation film, and is bent again at a right angle by the total reflection mirror and emitted.
The polarization direction of either of the two types of linearly polarized light beams is converted by 90 deg by a half-wave retardation plate provided at the subsequent stage, so that the incident light beam can be converted into one type of linearly polarized light beam. Become.
By such a uniform illumination optical device 3, the light beam that is divided into a plurality of partial light beams and whose polarization direction is aligned is emitted to the color separation optical device 4.

The color separation optical device 4 has a function of separating a light beam emitted from the uniform illumination optical device 3 into three color lights of red light (R), green light (G), and blue light (B), and a dichroic mirror 41. , 42 and reflecting mirrors 43, 44, 45.
The dichroic mirrors 41 and 42 are optical elements that are disposed with an inclination of approximately 45 degrees with respect to the optical path center axis of the light beam, and in which a dielectric multilayer film is formed on a transparent substrate such as BK7 or quartz glass. The dielectric multilayer films of the dichroic mirrors 41 and 42 have a function of reflecting a light beam in a specific wavelength region, transmitting other light beams, and separating the light beam into a plurality of color lights. The dichroic mirror 41 arranged in the front stage of the optical path reflects red light (R) and transmits the other green light (G) and blue light (B), while the dichroic mirror 42 arranged in the rear stage of the optical path is , Green light (G) is reflected and blue light (B) is transmitted.

The reflection mirrors 43, 44, and 45 are optical elements that guide the red light (R) and the blue light (B) separated by the dichroic mirrors 41 and 42 to the liquid crystal panels 61R and 61B that constitute the light modulation device 6, Consists of a total reflection mirror.
A relay optical device 5 is provided in the optical path of the blue light (B) separated by the color separation optical device 4, and the relay optical device 5 is provided by two condensing lenses 51 and 52 arranged in the optical path. It has a function of guiding the blue light (B) to the liquid crystal panel 61B on the blue light side.

The light modulation device 6 includes three liquid crystal panels 61R, 61G, and 61B, three incident-side polarizing plates 62R, 62G, and 62B arranged in front of the optical paths of the liquid crystal panels 61R, 61G, and 61B, and the liquid crystal panels 61R, Three exit-side polarizing plates 63R, 63G, and 63B are provided in the latter stages of the optical paths 61G and 61B.
The liquid crystal panels 61R, 61G, and 61B have a configuration in which a liquid crystal that is an electro-optical material is hermetically sealed between a pair of transparent glass substrates, and the alignment state of the liquid crystal is controlled according to input image information. The polarization direction of the linearly polarized light beam transmitted through the incident side polarizing plates 62R, 62G, and 62B is modulated. Among the light beams modulated by the liquid crystal panels 61R, 61G, 61B, a predetermined linearly polarized light beam is transmitted through the exit side polarizing plates 63R, 63G, 63B, and the other polarized light beams are transmitted by the exit side polarizing plates 63R, 63G, 63B. Absorbed. The light beam modulated by the light modulation device 6 is emitted to the color synthesis optical device 7.

The color synthesizing optical device 7 has a function of synthesizing the modulated light beams emitted from the exit-side polarizing plates 63R, 63G, and 63B to form a color image, and has a substantially square shape in plan view in which four right-angle prisms are bonded. And a cross dichroic prism in which two dielectric multilayer films are formed at the interface where the right-angle prisms are bonded together. One of the two dielectric multilayer films reflects red light (R) and transmits green light (G), and the other reflects blue light (B) and transmits green light (G). These dielectric multilayer films combine red light (R), green light (G), and blue light (B) to form a color image.
Although not shown in FIG. 1, the projection optical device 8 is composed of a combined lens in which a plurality of lenses are arranged in the lens barrel with the optical axis aligned, and an optical image synthesized by the color synthesis optical device 7 is screened. Project onto the SC.

● 2. Structure of Light Source Drive Device 9 and Controller 10 Next, the light source drive device 9 that performs the lighting drive of the light source device 2 and the controller 10 that serves as a control means for controlling the light source drive device 9 will be described with reference to FIG. .
The light source driving device 9 is provided in the middle of wiring for supplying power from the power source 11 to the discharge arc tubes 211 and 221, and includes a down converter 91 and an inverter bridge 92.
The down converter 91 is a circuit that drops a DC voltage input at about 300 V to 400 V to about 50 V to 150 V suitable for lighting the discharge arc tubes 211 and 221. Although not shown, the down converter 91 includes a switching element and a coil connected in series, and a diode and a capacitor branched and connected from these elements.
The switching element drops the DC voltage input from the power supply 11 to a desired voltage. In addition, the coil, the diode, and the capacitor function as elements that remove high-frequency components of the input DC current, rectify, and make the input DC voltage constant power.

The inverter bridge 92 is a part that converts a direct current into an alternating current rectangular wave current. Although not shown, the inverter bridge 92 is configured as a bridge circuit in which four transistors are connected, and the discharge arc tube 211, A voltage application wiring to the electrode 221 is connected.
The bridge circuit receives a DC current rectified through the down converter 91 and is connected between the pair of transistors facing each other and the other pair of transistors alternately by switching control. The discharge type arc tubes 211 and 221 are supplied with an AC rectangular wave current, and the discharge type arc tubes 211 and 221 are driven to light by the AC rectangular wave current.

The igniter 12 is configured as a circuit that promotes activation of the discharge arc tubes 211 and 221 by performing dielectric breakdown between the electrodes of the discharge arc tubes 211 and 221.
Although not shown, the igniter 12 includes a high voltage pulse generation circuit and a pulse transformer to which the high voltage pulse generation circuit is connected to the primary side. The high voltage pulse generated by the high voltage pulse generation circuit is converted into a secondary voltage of the pulse transformer. By boosting the voltage on the side and applying the boosted voltage to the electrodes of the discharge arc tube 211 and 221, the insulation between the electrodes is broken, electrical conduction is ensured, and the discharge arc tube starts to light. .
The configuration of the down converter 91, the inverter bridge 92, and the igniter 12 described above is basically the same regardless of the type of the discharge arc tubes 211 and 221. The driving voltage is different.

The controller 10 includes a converter control unit 14, an inverter control unit 15, an igniter control unit 16, a lighting state determination unit 17, a light emission characteristic information storage unit 18, and a drive power control unit 19.
The converter control unit 14 is a part that performs switching control of the down converter 91, the inverter control unit 15 is a part that performs switching control of a pair of transistors of the inverter bridge 92, and the igniter control unit 16 controls driving of the igniter 12. It is a part to do.

The lighting state determination unit 17 is a part for determining whether or not the lighting state of the discharge arc tubes 211 and 221 is stable, and a detection signal from the temperature sensor 13 provided in the vicinity of each discharge arc tube 211 and 221. Based on the above, the lighting state of each discharge arc tube 211, 221 is determined in comparison with the information stored in the light emission characteristic information storage unit 18.
The light emission characteristic information storage unit 18 is a part that stores light emission characteristic information corresponding to the type of the discharge type light emitting tubes 211 and 221. Specifically, as shown in FIG. 5, a halogen lamp, a xenon lamp, a metal halide, and the like. Color temperature, luminous efficiency, lamp power, total luminous flux, wavelength region with high intensity when emitting light, wavelength region with low intensity when emitting light, stable lighting, depending on the type of discharge arc tube such as a lamp or ultra-high pressure mercury lamp Information such as time is stored.
The drive power control unit 19 is a part that controls the drive power supplied to each of the discharge arc tubes 211 and 221 by controlling the power supply 11. The drive power control unit 19 controls the drive power based on the determination result of the lighting state determination unit 17. Control.

● 3. Next, the operation of the present embodiment will be described based on the flowchart shown in FIG.
First, when the light source device 2 is activated with the activation of the projector 1 (procedure S1), the lighting state determination unit 17 of the controller 10 acquires the emission characteristic information stored in the emission characteristic information storage unit 18 (procedure S2). . In this embodiment, since the discharge arc tube 211 is an ultra high pressure mercury lamp and the discharge arc tube 221 is a metal halide lamp, the color temperature information of the ultra high pressure mercury lamp and the metal halide lamp in the emission characteristic information storage unit 18 is acquired. .
Next, the lighting state determination unit 17 notifies that the drive is ready, and the drive power control unit 19 starts driving control of the discharge arc tubes 211 and 221 (step S3), and further uses a metal halide lamp. The maximum driving power is given to a certain discharge type arc tube 221 (step S4).

When the lighting of the discharge arc tubes 211 and 221 is started, the lighting state determination unit 17 starts measuring the temperature of the discharge arc tubes 211 and 221 at a predetermined interval based on the detection signal from the temperature sensor 13 ( Procedure S5).
In this embodiment, since the discharge arc tube 221 that is a metal halide lamp has a shorter lighting stabilization time, the lighting state determination unit 17 determines that the temperature of the discharge arc tube 221 that is an ultrahigh pressure mercury lamp is the emission characteristic information. It is determined whether the color temperature stored in the storage unit 18 has been reached (step S6).
When it is determined that the color temperature of the discharge arc tube 221 has reached the color temperature stored in the emission characteristic information storage unit 18, the lighting state determination unit 17 determines that the lighting state of the discharge arc tube 211, which is an ultrahigh pressure mercury lamp. Based on this, the drive power control unit 19 decreases and adjusts the power applied to the discharge arc tube 221 that is a metal halide lamp (step S7).

When controlling the driving power applied to the discharge arc tubes 211 and 221 in the above procedure, as shown in FIG. 7, after the metal halide lamp is driven at the maximum driving power, the lighting state of the ultrahigh pressure mercury lamp is The metal halide lamp is driven with the maximum driving power until it stabilizes, and after the lighting state of the ultra high pressure mercury lamp is stabilized, the brightness of the metal halide lamp and the ultra high pressure mercury lamp when the metal halide lamp is driven with the maximum driving power is 50. It is preferable to drive-control so that it may become about%.
In this way, the brightness of the projected image immediately after driving the light source device 2 and the brightness of the projected image after the lighting of all the discharge arc tubes 211 and 221 are stabilized do not change, and the observer can There is no sense of incongruity.

Then, by using a super high pressure mercury lamp and a metal halide lamp in combination to form a projection image, as shown in FIGS. 2 and 3, the wavelength region having a weak relative intensity in the light emission characteristics of one lamp is changed to the other. Since it can be supplemented with a lamp, the color reproducibility of the projected image can be improved.
In addition, the projector 1 employs two discharge type light emitting tubes 211 and 221 having different light emission characteristics, and the driving power control unit 19 controls the driving power applied thereto, thereby preventing color unevenness using the LUT in the image processing circuit. Since not only the correction but also the correction of the color of the light beam emitted from the light source device 2 itself can be used together, the color reproducibility of the projected image can be further improved.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In the following description, the same parts as those already described are denoted by the same reference numerals and the description thereof is omitted.
In the first embodiment, as shown in FIG. 1, different types of discharge arc tubes 211 and 221 are applied to the three-plate projector 1 in which the liquid crystal panels 61R, 61G, and 61B are provided.
On the other hand, the projector 1A according to the second embodiment is provided with two optical systems 70 and 80 as shown in FIG. 8, and is emitted from the discharge arc tubes 211 and 221 of the light source device 2, respectively. The difference is that the projector is a six-plate projector that supplies light beams to separate optical systems 70, 80, modulates them with the light modulation device 6 of the optical systems 70, 80, forms an optical image, and projects the optical image.

In the first embodiment, the lighting state determination unit 17 of the controller 10 determines the stability of the lighting state of the discharge arc tubes 211 and 221 based on the detection signal from the temperature sensor 13.
On the other hand, in the controller 10A of the projector 1A according to the second embodiment, as shown in FIG. 9, the lighting state determination unit 17A determines whether or not the lighting state is stabilized by the time measurement of the time measuring unit 13A such as a timer. It is different in that it is determined.
Hereinafter, this embodiment will be described in detail.

The first optical system 70 and the second optical system 80 of the projector 1A have the same basic configuration, and the optical systems 70 and 80 are the same as the optical system of the projector 1 according to the first embodiment of the three-plate type. It is.
In the subsequent stage of the color synthesizing optical device 7 of each optical system 70, a synthesizing optical system 90 is arranged, and optical images emitted from the optical systems 70 and 80 are synthesized by the synthesizing optical system 90 and synthesized. The image is projected from the projection optical device 8 onto the screen SC.

The synthesizing optical system 90 is configured as a prism on which a polarization separation film is disposed that is inclined by approximately 45 degrees with respect to the optical path centers of the optical systems 70 and 80.
Since the polarization separation film has a property of transmitting a P-polarized light beam and reflecting an S-polarized light beam among linearly polarized light beams, the polarization conversion of the uniform illumination optical device 3 of the optical system 70 converts all incident light beams into P-polarized light beams. Polarization conversion of the uniform illumination optical device 3 of the optical system 80 is performed by the polarization conversion element 33S that converts all incident light beams into S-polarized light beams.
In accordance with this, the optical systems 70 and 80 of the polarizing plates disposed on the incident side and the emission side of the light modulation device 6 are also changed.

As shown in FIG. 9, the controller 10 </ b> A includes a converter control unit 14, an inverter control unit 15, an igniter control unit 16, a light emission characteristic information storage unit 18, and a drive power control unit 19, as in the first embodiment. In addition, a timer unit 13A such as a timer circuit and a lighting state determination unit 17A that determines the lighting stable state of the discharge arc tube 211 from the timing result of the timer unit 13A are provided.
The lighting state determination unit 17A acquires the lighting stabilization time of the discharge arc tubes 211 and 221 stored in the light emission characteristic information storage unit 18 having the same structure as that of the first embodiment as the driving of the light source device 2 starts. The time information of the part 13A is acquired.
Then, when it is determined that the timing information has reached the lighting stabilization time of the discharge arc tube 211, the lighting state determination unit 17A notifies the drive power control unit 19 to that effect, and the drive power control unit 19 The drive power of the discharge arc tube 221 is adjusted to decrease by the same method as in the embodiment.
Even in this embodiment, the same effects as in the first embodiment can be obtained.

[Modification of Embodiment]
Note that the present invention is not limited to the above-described embodiment, and includes the following modifications.
In each of the embodiments described above, a plurality of liquid crystal panels 61R, 61G, and 61B are used as the light modulation device 6, but the present invention is not limited to this. For example, the present invention may be applied to a single-plate projector, and further, the present invention may be applied to a device using a micromirror.
In each of the above embodiments, an ultra-high pressure mercury lamp and a metal halide lamp are employed as the discharge arc tube. However, the present invention is not limited to this, and other types of discharge arc tubes such as a halogen lamp and a xenon lamp are employed. May be.
Furthermore, in the embodiment, the light source device 2 uses two different discharge arc tubes 211 and 221. However, the present invention is not limited to this, and the light source device 2 may be a light source device using three or more types of discharge arc tubes. .
In addition, the specific structure, shape, and the like when implementing the present invention may be other structures as long as the object of the present invention can be achieved.

1 is a schematic diagram of an optical system of a projector according to a first embodiment of the invention. The graph showing the light emission characteristic of the ultrahigh pressure mercury lamp in the said embodiment. The graph showing the light emission characteristic of the metal halide lamp in the said embodiment. The block diagram showing the structure of the light source drive device and control means in the said embodiment. The schematic diagram showing the structure of the light emission characteristic information storage part in the said embodiment. The flowchart for demonstrating the effect | action of the said embodiment. The graph for demonstrating the effect | action of the said embodiment. The schematic diagram of the optical system of the projector which concerns on 2nd Embodiment of this invention. The block diagram showing the structure of the light source drive device and control means in the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 1A ... Projector, 2 ... Light source device, 3 ... Uniform illumination optical device, 4 ... Color separation optical device, 5 ... Relay optical device, 6 ... Light modulation device, 7 ... Color composition optical device, 8 ... Projection optical device, DESCRIPTION OF SYMBOLS 9 ... Light source drive device 10, 10A ... Controller, 11 ... Power supply, 12 ... Igniter, 13 ... Temperature sensor, 13A ... Time measuring part, 14 ... Converter control part, 15 ... Inverter control part, 16 ... Igniter control part, 17, 17A: lighting state determination unit, 18: light emission characteristic information storage unit, 19: driving power control unit, 21, 22 ... light source lamp, 23 ... reflection mirror, 24 ... collimating lens, 31 ... first lens array, 32 ... first 2 lens array, 33, 33P, 33S ... polarization conversion element, 34 ... superimposing lens, 41, 42 ... dichroic mirror, 43, 44, 45 ... reflection mirror, 51, 52 ... condensing lens, 1R, 61G, 61B ... Liquid crystal panel, 62R, 62G, 62B ... Incident side polarizing plate, 63R, 63G, 63B ... Emission side polarizing plate, 70 ... First optical system, 80 ... Second optical system, 90 ... Synthetic optical system , 91 ... Down converter, 92 ... Inverter bridge, 211 ... Discharge arc tube (super high pressure mercury lamp), 212 ... Reflector, 221 ... Discharge arc tube (metal halide lamp), 222 ... Reflector, SC ... Screen

Claims (3)

A light source device, a light modulation device that modulates a light beam emitted from the light source device according to input image information to form an optical image, and projection optics that projects an optical image formed by the light modulation device A projector comprising a device,
The light source device includes a plurality of types of discharge arc tubes having different emission characteristics. The projector according to claim 1, wherein
A plurality of light source driving devices for driving each discharge arc tube;
Control means for performing drive control of each light source driving device,
The control means includes
A light emission characteristic information storage unit for storing characteristic information on the light emission characteristic of each discharge arc tube;
A lighting state determination unit that determines whether or not the lighting state of each discharge arc tube is stable based on the characteristic information stored in the light emission characteristic information storage unit,
When the light source device is driven, the discharge type light emitting tube having the shortest time during which the lighting state is stabilized is given the maximum driving power, and the lighting state determination unit determines that the lighting state of the other discharge type light emitting tubes is stable. And a drive power control unit for reducing the power applied to the discharge arc tube to which the maximum drive power is applied. In the projector according to claim 1 or 2,
One of the plurality of types of discharge arc tubes is a metal halide lamp, and the other is an ultrahigh pressure mercury lamp.

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