JPH09320780A - High-pressure discharge lamp-lighting device and image display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the breakage of circuit components or ignition during discharge by arranging a mechanism which always monitors lamp voltage during lighting of a high-pressure discharge lamp and displays power supply stoppage or abnormality when abnormality is detected. SOLUTION: DC current is supplied to a lighting main circuit 2 having a current limiting function and an adjusting function, such as constant power control from a DC power source 1, and a short arc high-pressure discharge lamp 4 is started through a starting circuit 3. A lamp voltage monitoring means 5 always monitors lamp voltage, a detection output is sent to an abnormality judging means 7, a stable lighting recognition means 6 recognizes that the high-pressure discharge lamp 4 has moved to stable lighting, and permits the abnormality judging means 7 to make judging operation to, and when the lamp voltage after lighting is lowered compared to the specified value, the abnormality judging means 7 judges it as being abnormal, and a control means 8 stops power supply from the lighting main circuit 2 to the high-pressure discharge lamp 4 or displays abnormality. Generation of slow leak in the high pressure discharge lamp 4 is surely detected, and damage in circuit components or ignition is prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp lighting device and an image display device which are lit by direct current.

[0002]

2. Description of the Related Art In projection type television receivers and overhead projectors, small high pressure discharge lamps have been used as a light source.

Conventionally, discharge lamps used in such applications have a distance between electrodes of 5 to 10 mm and are AC-lit.

However, although the discharge lamp lighting device is inexpensive for AC lighting, there are problems that the life of the discharge lamp is shorter than an expected value and the light utilization rate is low. Therefore, DC lighting has been recently adopted. It started to come.

The high-pressure discharge lamp used for DC lighting is a so-called short arc, and the distance between the electrodes is 6 mm or less, for example 4 mm or less, so that the light utilization rate can be increased. In addition, the life is almost extended as expected.

Due to such characteristics, the high-pressure discharge lamp of direct current lighting is rapidly becoming popular especially in the above-mentioned applications.

[0007]

However, since a DC-lit high pressure discharge lamp has a long life, there is a relatively high probability that a slow leak will occur during use. When a slow leak occurs or a high pressure discharge lamp in which a slow leak occurs is started, the high pressure discharge lamp is lit by direct current and the distance between the electrodes is short, so that the discharge continues between the electrodes.

However, since the vapor pressure of the luminescent metal in the discharge lamp is lower than the predetermined value, the lamp voltage does not rise. Therefore, an overcurrent of about twice the rated value of the lamp current during stable lighting flows. If this overcurrent continues to flow, there is a risk that circuit parts of the high pressure discharge lamp lighting device may be destroyed or that the discharge lamp may ignite due to air discharge.

It is an object of the present invention to provide a high pressure discharge lamp lighting device capable of detecting the occurrence of a slow leak and performing a predetermined control, and an image display device using this device.

[0010]

According to a first aspect of the present invention, there is provided a high pressure discharge lamp lighting device, including a lighting main circuit for lighting the high pressure discharge lamp with a direct current; a starting circuit for starting the high pressure discharge lamp; Lamp voltage monitoring means for monitoring the lamp voltage of;
Abnormality determination means for determining that the high-pressure discharge lamp is abnormal when the lamp voltage after stable lighting of the high-pressure discharge lamp is lower than a predetermined value; and predetermined control is performed when the abnormality determination means determines abnormality It is characterized in that it is provided with control means.

In the present invention, the high-pressure discharge lamp is not limited to a short-arc high-pressure discharge lamp, as long as the discharge can sustain discharge if a slow leak occurs during its life. The present invention is effective for a high pressure discharge lamp with a short arc because the discharge has a relatively high probability of being sustained when a slow leak occurs.

Further, the main lighting circuit may be one that operates a commercial discharge frequency, a high frequency operation, or a direct current operation as long as the high pressure discharge lamp is operated by direct current. Such a configuration may be adopted. Then, it is preferable to control the high-voltage discharge lamp with constant power by using a lighting main circuit. In such a case, the lighting main circuit includes a switching means, and this switching means is used for both the lamp current and the lamp voltage. By controlling in accordance with the above, it is possible to perform constant power control. As the lighting main circuit including the switching means, this is configured by, for example, a chopper circuit, and by controlling the on-duty of the chopping of the chopper circuit, it becomes easy to perform constant power control.

Further, the starting circuit may have any structure as long as it can start the high pressure discharge lamp, and various known starting circuits can be adopted.

Furthermore, the lamp voltage monitoring means is not limited to a specific circuit configuration as long as it can directly or indirectly detect and monitor the lamp voltage. Then, it is permitted to use the lamp voltage monitoring means for controlling the normal lighting of the lighting main circuit.

Furthermore, the abnormality determining means may determine an abnormality when the lamp voltage after stable lighting of the high pressure discharge lamp is lower than a predetermined value, and its configuration is not limited to a specific circuit. The predetermined value means an arbitrarily set value lower than the normal lamp voltage. With this setting, even if the high-pressure discharge lamp is normal, variations in lamp voltage due to variations in manufacturing of individual lamps, differences in specifications, differences between manufacturers, and differences in lamp voltage due to lighting conditions of the lighting main circuit Further, it can be set to a constant value in advance by appropriately considering the change in the lamp voltage during the life. If necessary, the lamp voltage of the high-pressure discharge lamp in use at the time of previous lighting may be stored, and this may be set as a predetermined value, and the lamp voltage at the next lighting may be compared.

Furthermore, the control means may control the lighting main circuit to stop the supply of electric power to the high pressure discharge lamp,
Further, the abnormality display may be performed, or both may be performed together. If necessary, the power supply may be reduced to the extent that a problem does not occur without stopping the power supply to the high pressure discharge lamp.

In any case, in the present invention, when a slow leak occurs in the high-pressure discharge lamp, the lamp voltage becomes lower than that during stable lighting. Therefore, the abnormality determining means determines that it is abnormal, and the control means determines a predetermined value. The control of, for example, stopping or reducing the supply of electric power to the high-pressure discharge lamp or displaying is performed to cope with the occurrence of an abnormality.

The high pressure discharge lamp lighting device according to the invention of claim 2 is
The high pressure discharge lamp lighting device according to claim 1 is characterized in that the lighting main circuit is configured to supply a predetermined lamp power to the high pressure discharge lamp in accordance with a lamp current and a lamp voltage.

In the present invention, the predetermined lamp power includes constant power and can be set so as to give desired characteristics such as constant current and constant voltage.

A high pressure discharge lamp lighting device according to a third aspect of the present invention comprises:
The high pressure discharge lamp lighting device according to claim 1 or 2,
The lighting main circuit includes a switching means, and is configured to control the switching means according to the lamp current and the lamp voltage to supply a predetermined lamp power to the high-pressure discharge lamp.

The present invention allows the lighting main circuit to be a chopper circuit, and in this case, the switching means in the present invention corresponds to the switching means for chopping. Then, the switching means gives a desired lighting characteristic at the time of lighting to light the high-pressure discharge lamp, so that the on-duty changes according to, for example, the lamp current and / or the lamp voltage.

The high pressure discharge lamp lighting device according to the invention of claim 4 is
In the high pressure discharge lamp lighting device according to any one of claims 1 to 3, the control means stops the power supply to the high pressure discharge lamp when the abnormality is determined.

According to the present invention, when a slow leak occurs, the power supply to the high pressure discharge lamp is stopped to prevent damage to circuit parts and fire.

The high pressure discharge lamp lighting device according to the invention of claim 5 is
In the high pressure discharge lamp lighting device according to any one of claims 1 to 4, the control means displays an abnormality when determining an abnormality.

According to the present invention, when a slow leak occurs, an anomaly is displayed to notify a person concerned of the anomaly, and measures such as replacement of the high-pressure discharge lamp and power shutoff can be taken at an early stage.

A high pressure discharge lamp lighting device according to a sixth aspect of the present invention comprises:
The high pressure discharge lamp lighting device according to any one of claims 1 to 5, further comprising a high pressure discharge lamp.

That is, the present invention also requires a high pressure discharge lamp as a constituent element. The high-pressure discharge lamp and the circuit portion such as the lighting main circuit may be a common assembly or may be separated.

A high pressure discharge lamp lighting device according to a seventh aspect of the present invention comprises:
The high pressure discharge lamp lighting device according to any one of claims 1 to 6, wherein the high pressure discharge lamp is a short arc high pressure discharge lamp.

The present invention is suitable for this discharge lamp of the present invention because the high-pressure discharge lamp that is operated by direct current has a short arc and thus has a long life, and therefore the probability of occurrence of slow leak during the life is relatively high. is there.

The high pressure discharge lamp lighting device according to the invention of claim 8 is
The high pressure discharge lamp lighting device according to any one of claims 1 to 7, wherein the high pressure discharge lamp has a distance between electrodes of 6 mm or less.

The high-pressure discharge lamp of the present invention shows a general range of establishment of the inter-electrode distance in which a high utilization factor of light is obtained in combination with a reflector.

The high pressure discharge lamp lighting device according to the invention of claim 9 is
The high pressure discharge lamp lighting device according to any one of claims 1 to 8, wherein the high pressure discharge lamp has a distance between electrodes of 4 mm or less.

The high pressure discharge lamp according to the present invention shows a preferable range with respect to claim 8.

A high pressure discharge lamp lighting device according to a tenth aspect of the present invention is the high pressure discharge lamp lighting device according to any one of the first to ninth aspects, wherein the high pressure discharge lamp is a metal halide lamp.

The metal halide lamp according to the present invention is
Although the luminescent metal is not limited to a specific one, as a high-pressure discharge lamp for a projection television receiver, the following configuration has the required luminescent characteristics, that is, luminous efficiency, correlated color temperature, chromaticity and A favorable result is obtained in terms of color rendering. That is, dysprosium D
y, cesium Cs and neodymium Nd as main components,
If necessary, thallium Tl and / or tin Sn is added as an auxiliary component, and an appropriate amount of iodine and / or bromine is enclosed with these components together with mercury and a rare gas.

A high pressure discharge lamp lighting device according to an eleventh aspect of the present invention is the high pressure discharge lamp lighting device according to any one of the first to tenth aspects, wherein the high pressure discharge lamp is integrally provided with a reflector. I am trying.

In the present invention, a reflector is integrated with a high-pressure discharge lamp so that optical performance can be easily exhibited, and therefore, the present invention is suitable for a projection type television receiver, an overhead projector and the like.

A high pressure discharge lamp lighting device according to a twelfth aspect of the present invention is the high pressure discharge lamp lighting device according to any one of the first to eleventh aspects, further comprising stable lighting recognition means for recognizing stable lighting of the high pressure discharge lamp. It is characterized by

According to the present invention, the abnormality determination can be performed promptly after the stable lighting by the stable lighting recognition means.

A high pressure discharge lamp lighting device according to a thirteenth aspect of the present invention is the high pressure discharge lamp lighting device according to the twelfth aspect, in which the stable lighting recognition means recognizes stable lighting according to the terminal voltage of the high pressure discharge lamp. It has a feature.

The high-pressure discharge lamp is in a short-circuit state immediately after starting and the lamp voltage is very low. Since the lamp voltage gradually rises as the vapor pressure of the luminescent substance increases, the rate of change is detected, or the lamp voltage value to be reached is set in advance and compared with the actual lamp voltage. It is possible to recognize the stable lighting by performing the above detection.

A high pressure discharge lamp lighting device according to a fourteenth aspect of the present invention is the high pressure discharge lamp lighting device according to the twelfth aspect, wherein the stable lighting recognition means recognizes the stable lighting according to the temperature of the high pressure discharge lamp. I am trying.

When the high-pressure discharge lamp becomes stable lighting, the lamp voltage rises and a predetermined lamp power is consumed, so that it is easy to detect the stable lighting by detecting the temperature rise. .

A high pressure discharge lamp lighting device according to a fifteenth aspect of the present invention is the high pressure discharge lamp lighting device according to the twelfth aspect, wherein the stable lighting recognition means recognizes the stable lighting according to the operating time of the high pressure discharge lamp. It has a feature.

Since the time required from the start of the high-pressure discharge lamp to the stable lighting is generally known, there is no problem in recognizing the stable lighting after a lapse of a predetermined time from the start or power-on. The present invention has a simple structure.

A high pressure discharge lamp lighting device according to a sixteenth aspect of the present invention is the high pressure discharge lamp lighting device according to any one of the first through fifteenth aspects, wherein the predetermined value of the lamp voltage is a lamp after stable lighting of the high pressure discharge lamp. It is characterized by being set lower than the voltage.

By setting a predetermined value of the lamp voltage as in the present invention, the slow leak can be detected with certainty. A favorable result can be obtained by setting the lamp voltage to 95% or less.

A high pressure discharge lamp lighting device according to a seventeenth aspect of the present invention is the high pressure discharge lamp lighting device according to any one of the first to sixteenth aspects, wherein the abnormality determining means stores the lamp voltage of the high pressure discharge lamp. A comparing means for comparing the lamp voltage obtained by the lamp voltage monitoring means with the lamp voltage stored in the storing means; and a judging means for judging an abnormality when the former is lower as a result of comparison by the comparing means. It is characterized by that.

According to the present invention, in the high-pressure discharge lamp, variations in manufacture, differences in specifications, variations in lamp voltage due to differences between manufacturers, differences in lighting conditions of the lighting main circuit, and further changes in lamp voltage during life. Even if there is, it is possible to reliably make an abnormality determination.

An image display device according to the invention of claim 18 is a high pressure discharge lamp having a reflector; a high pressure discharge lamp lighting device according to any one of claims 1 to 5 for lighting the high pressure discharge lamp; Image display means for irradiating the light emitted from the back and condensed by the reflector from the back; image control means for controlling the image display means; optics for condensing the light transmitted through the image display means and projecting it on the screen And a main body case for accommodating each of the above components.

According to the present invention, it is possible to obtain an image display device in which even if a slow leak occurs, it can be detected promptly and appropriate measures can be taken.

[0052]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a block circuit diagram showing the concept of the present invention.

In the figure, 1 is a DC power supply, 2 is a lighting main circuit, 3 is a starting circuit, 4 is a high-pressure discharge lamp, 5 is lamp voltage monitoring means, 6 is stable lighting recognition means, 7 is abnormality determination means, and 8 is
Is control means.

The lighting main circuit 2 has a current limiting function for stably lighting the high pressure discharge lamp 4 and an adjusting function for constant power control.

The starting circuit 3 is for starting the high-pressure discharge lamp 4, and is usually used for generating a high voltage at the time of starting.

The high pressure discharge lamp 4 has a short arc and is often integrated with a reflector (not shown).

The lamp voltage monitoring means 5 constantly monitors the lamp voltage and sends the detection output to the abnormality judging means 7.

The stable lighting recognition means 6 directly or indirectly recognizes that the high pressure discharge lamp 4 has shifted to stable lighting, and permits the abnormality judgment means 7 to make a judgment operation.

When the abnormality judging means 7 judges that the abnormality has occurred, the control means 8 carries out a predetermined control which is set in advance. As the control, either one or both of stopping the power supply from the lighting main circuit 2 to the high-pressure discharge lamp 4 and displaying an abnormality, or any other desired control is permitted.

Further, the control means 8 detects not only the control at the time of abnormality determination but also the lamp current from the lighting main circuit 2 at the time of normal lighting, the lamp voltage from the lamp voltage monitoring means 5, and calculates both of them. Thus, the lighting main circuit 2 can also be subjected to constant power control.

Thus, in the above configuration, if the detection output from the lamp voltage monitoring means 5 is lower than that during normal operation after the stable lighting of the high pressure discharge lamp 4 or until the time when stable lighting is required, the abnormality determining means. 7 is determined to be abnormal. As a result, the control means 8 performs a predetermined control set in advance. As a result, even if a slow leak occurs in the high-pressure discharge lamp 4 and the discharge continues, it can be promptly detected and a predetermined measure is automatically taken. Therefore, problems such as damage to circuit parts and ignition can be prevented.

FIG. 2 shows the first embodiment of the high pressure discharge lamp lighting device of the present invention.
FIG. 3 is a circuit diagram showing the embodiment.

In the figure, the same parts as those in FIG.

A characteristic feature of the present embodiment is that the stable lighting recognition means 6 mainly comprises a timer 6a.
That is, the stable lighting recognition means 6 is composed of a timer circuit 6a, a transistor 6b and a voltage division circuit 6c. In the figure of the voltage dividing circuit 6c, the upper end is a negative potential source V _DC.
Connected to

Next, the circuit operation will be described. Before the predetermined time until stable lighting, the output potential of the timer circuit 6a is high,
Since the transistor 6b is off, the output potential of the voltage division circuit 6c is low. After a lapse of time until stable lighting, the base potential of the transistor 6a rises, so that the transistor 6b is turned on and the output potential of the voltage dividing circuit 6c rises, which means that stable lighting is recognized. In the figure, AG indicates a pseudo earth having a predetermined potential with respect to the earth potential.

The abnormality judging means is composed of an AND circuit 7a, the minus terminal on the input side is the lamp voltage monitoring means 5,
The positive terminals are connected to the output terminals of the voltage dividing circuit 6C, respectively. The negative terminal of the AND circuit 7a is Lo
w, when the plus terminal is Hi, the output terminal becomes Hi.

Then, when the stable lighting recognition means 6 recognizes the stable lighting, the plus terminal of the AND circuit 7a becomes Hi. While the stable lighting recognizing means 6 does not recognize the stable lighting, the potential of the positive terminal of the AND circuit 7a is Low, so that the output terminal does not become Hi even if the negative terminal is Low. Therefore, when the potential of the lamp voltage monitoring means 5 becomes lower than a predetermined value, that is, becomes Low after the stable lighting time, the potential of the output terminal of the AND circuit 7a becomes Hi.
And it is determined to be abnormal. On the contrary, if normal, the potential of the lamp voltage monitoring means 5 is higher than a predetermined value, and therefore the potential of the output terminal of the AND circuit 7a remains Low.

In this way, when the output terminal of the AND circuit 7a becomes Hi, that is, when the abnormality determining means 7 determines that there is an abnormality, the control means 8 performs a predetermined control.

In this embodiment, the control means 8 comprises a lighting main circuit control means 8a for controlling the lighting main circuit 2 and an abnormality display means 8b. The lighting main circuit control means 8a stops the oscillation when the abnormality determination means 7 determines an abnormality. Then, since the chopper is not driven, the power supply to the high pressure discharge lamp 4 is stopped.

On the other hand, the abnormality display means 6b displays the occurrence of abnormality at the time of abnormality determination. The lighting main circuit control means 8a oscillates to drive the chopper during normal lighting of the high pressure discharge lamp 4, and the lighting main circuit is detected by the detection signal from the lamp current detection means 9 and the detection signal from the lamp voltage monitoring means 5. The control means 8a is controlled to control the high pressure discharge lamp 4 at a constant power.

The lighting main circuit 3 is composed of a step-down chopper. That is, the switching means 2a, the diode 2b and the reactor 2c which are inserted in series in the discharge main circuit.
And are the main components. Switching means 2
a performs switching at a high frequency of, for example, about 40 KHz, and the diode 2b and the reactor 2c perform a smoothing action. The switching means 2a is PWM-controlled by the lighting main circuit control means 8a. Normally, PWM control is performed so as to approximate constant power control according to the lamp current and the lamp voltage, but when an abnormality occurs, power supply to the high pressure discharge lamp is stopped by stopping oscillation as described above.

The lamp current detecting means 9 is mainly composed of a resistor inserted in series in the discharge main circuit. Reference numeral 10 is a reflector that is optically opposed to and integrated with the high pressure discharge lamp 4.

FIG. 3 shows a second embodiment of the high pressure discharge lamp lighting device according to the present invention.
FIG. 3 is a circuit diagram showing the embodiment.

The same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

The structural feature of this embodiment is that the stable lighting recognition means 6 and the abnormality determination means 7 are mainly composed of the microcomputer 7b. That is, the stable lighting recognition means 6 is composed of the timer function part of the microcomputer 7a. Further, the abnormality determining means 7 connects the output terminal of the lamp voltage monitoring means 5 to the base of the transistor 7b, and the negative potential source V
The collector of the transistor 7b which is connected via a resistor 7c to _DC 1 through the resistor 7d connected to the light emitting diode 7e. It is connected to the phototransistor 7f for receiving the light emission of the light-emitting diode 7e to the negative potential source V _DC 2 via a predetermined port and the resistor 7g of the microcomputer 7a.

When the stable lighting time of the high pressure discharge lamp 4 is measured by the timer function portion of the microcomputer 7a, the output of the lamp voltage monitoring means 5 is set to a value lower than the normal lamp voltage in advance. When it is lower than the predetermined value, the transistor 7b is turned off, and the light emitting diode 7e emits light. The light enters the phototransistor 7f,
The phototransistor 7f is turned on and the potential of the predetermined port of the microcomputer 7a becomes Low. As a result, the microcomputer 7a determines that there is an abnormality, and an output signal is sent from its output port. On the contrary, in the normal state, the output of the lamp voltage monitoring means 5 is higher than the predetermined value, so that the transistor 7b is turned on,
The light emitting diode 7e does not emit light. Therefore, the phototransistor 7f is turned off, the potential of the predetermined port of the microcomputer 7a becomes Hi, and the microcomputer 7a determines that it is normal. Further, before the stable lighting time, the timer portion of the microcomputer 7a does not output an output signal, so the microcomputer 7a determines that it is normal.

On the other hand, the control means 8 is the lighting main circuit control means 8
Since the lighting main circuit control means 8a is controlled by the output signal of the abnormality determination means 7 via the photocoupler 8a1 to stop the oscillation, the power supply to the high pressure discharge lamp 4 is stopped.

Further, when the abnormality judging means 7 judges normal, the oscillating operation of the control means 8 is carried out, the output signal of the lamp current detecting means 9 is also inputted to the microcomputer 7a, and the photo coupler 8a1 and the lighting main circuit. The step-down chopper is PWM-controlled via the control means 8a. As a result, the high pressure discharge lamp 4 is configured to be controlled at a constant power.

FIG. 4 shows a third embodiment of the high pressure discharge lamp lighting device of the present invention.
FIG. 3 is a circuit diagram showing the embodiment.

The same parts as those in FIG. 2 are designated by the same reference numerals and the description thereof will be omitted.

The structural feature of the present embodiment is that the stable lighting recognition means 6 detects the temperature of the high-pressure discharge lamp 4 to recognize stable lighting. That is, the temperature detecting means 6d is connected in parallel to the voltage dividing circuit 6c. The temperature detecting means 6d has a configuration in which the switch is turned off at a predetermined temperature or higher.

When the high-pressure discharge lamp 4 is lit stably, a predetermined lamp power is consumed and the temperature of the discharge lamp 4 rises. At the temperature at this time, the temperature detecting means 6d is turned off, so that the output potential of the voltage dividing circuit 6c becomes high, so that the positive terminal of the AND circuit 7a becomes Hi. At this time, if the output of the lamp voltage monitoring means 5 is low, the negative terminal of the AND circuit 7a becomes Low, so the output terminal becomes Hi, and it is determined that there is an abnormality. For this reason, the control means 8 stops the oscillation of the chopper, so that the power supply to the high pressure discharge lamp 4 is stopped.

In the normal state, the negative terminal of the AND circuit 7a is Hi, and the output terminal is Low, so that it is determined to be normal. Before the stable lighting, the temperature detecting means 6
Since d is off, the output potential of the voltage division circuit 6c is low, and the positive terminal of the AND circuit 7a is low.
become. Therefore, the output terminal of the AND circuit 7a is Low.
Therefore, it is determined to be normal, the chopper oscillates, and power is supplied to the high pressure discharge lamp.

FIG. 5 shows a fourth embodiment of the high pressure discharge lamp lighting device of the present invention.
FIG. 3 is a circuit diagram showing the embodiment.

In the figure, the same parts as those in FIGS. 3 and 4 are designated by the same reference numerals and the description thereof will be omitted.

The characteristic feature of the present embodiment is that the characteristic portions of FIGS. 3 and 4 are combined, and the stable lighting recognition means 6 controls the stable lighting of the high pressure discharge lamp 4 to the temperature of the high pressure discharge lamp 4. It is configured such that it is recognized by detecting, and the abnormality determining means 7 is mainly configured by the microcomputer 7a '. That is, the temperature detecting means 6d for detecting the temperature of the high pressure discharge lamp 4 is connected to a predetermined port of the microcomputer 7a '.

FIG. 6 is a partially sectional front view showing an embodiment of the high pressure discharge lamp according to the present invention. In the figure, a high-pressure discharge lamp 4 is arranged in an elliptical quartz bulb 4a with the tips of an anode 4b and a cathode 4c closely adjacent to each other, and a pair of sealing portions 4d is provided at both ends of the bulb 4a. And supports the base end of the cathode 4c. Reference numeral 4e denotes a sealing metal buried hermetically in the sealing portion 4d, and reference numeral 4g denotes an outer lead wire connected to the sealing metal on the cathode side. Reference numeral 4f denotes an insulator supported by the sealing portion 4d on the anode side. The reflector 10 integrated with the high pressure discharge lamp 4 has an infrared transmission visible light reflection type optical interference film 10a provided on the inner surface thereof, and the insulator 4f is fixed in the neck portion 10b by the base cement 11. The high pressure discharge lamp 4 is supported, and both are integrated. 10c is a reflector 1
A through hole formed in a part of the reflective surface of 0,
Is led out toward the rear surface of the reflector 10. In addition,
Reference numeral 12 is a discharge lamp lighting device to which the above-described embodiments of the present invention are applicable.

FIG. 7 is a conceptual diagram showing an embodiment of the image display device of the present invention.

In the figure, the high pressure discharge lamp 4 is a reflector 1.
0 to form a light source 13. 14
Is an image display means, which is composed of, for example, a liquid crystal display, and is irradiated with the light emitted from the high-pressure discharge lamp 4 from its rear surface and condensed by the reflector 10. An image control unit 15 drives and controls the image display unit 14, and can have a television image receiving function if necessary. Reference numeral 16 denotes an AC power supply, which supplies required power to the high pressure discharge lamp lighting device 12 and the image control means 15. 17 is an optical system,
The light transmitted through the image display means 14 is collected and the screen 1
8 is projected. Reference numeral 19 denotes a main body case in which the above components are stored.

[0091]

According to the first to seventeenth aspects of the present invention,
Providing a high-pressure discharge lamp lighting device that is capable of coping with the occurrence of abnormalities by detecting slow leaks and performing predetermined control, since direct current lighting extends the life of the high-voltage discharge lamps. can do.

According to the invention of claim 2, it is possible to provide a high pressure discharge lamp lighting device capable of performing desired control such as constant power of the high pressure discharge lamp according to the lamp current and the lamp voltage.

According to the third aspect of the present invention, in addition, since the lighting main circuit includes the switching means, it is possible to provide the high pressure discharge lamp lighting device in which the desired control can be easily performed in the slow leak of the high pressure discharge lamp and in other normal times. it can.

According to the invention of claim 4, in addition, the supply of electric power to the high pressure discharge lamp is stopped when the slow leak is detected, so that a safe high pressure discharge lamp lighting device can be provided.

According to the fifth aspect of the invention, since the abnormality is displayed when the slow leak is detected, it is possible to provide the high pressure discharge lamp lighting device in which the occurrence of the abnormality can be easily recognized.

According to the sixth aspect of the present invention, it is possible to provide a high pressure discharge lamp lighting device including a high pressure discharge lamp.

According to the invention of claim 7, in addition, since the high pressure discharge lamp has a short arc, the discharge is relatively likely to continue when a slow leak occurs, but the slow leak is detected to cope with the occurrence of an abnormality. A high pressure discharge lamp lighting device can be provided.

According to the eighth aspect of the present invention, in addition, it is possible to provide a high pressure discharge lamp lighting device that exhibits a desired effect in a short arc high pressure discharge lamp having a distance between electrodes of 6 mm or less.

According to the invention of claim 9, since a short arc high pressure discharge lamp having an electrode distance of 4 mm or less is used,
It is possible to provide a high pressure discharge lamp lighting device that provides favorable results for slow leak detection and light utilization.

According to the tenth aspect of the present invention, in addition, there is provided a high pressure discharge lamp lighting device capable of selecting desired emission characteristics such as luminous efficiency, correlated color temperature, chromaticity, and color rendering by a metal halide lamp. You can

According to the eleventh aspect of the invention, since the high-pressure discharge lamp additionally includes a reflector, it is possible to provide a high-pressure discharge lamp lighting device that easily exhibits optical performance.

According to the twelfth aspect of the present invention, since the stable lighting recognition means for recognizing the stable lighting of the high pressure discharge lamp is additionally provided, the high pressure discharge lamp lighting device capable of promptly determining the abnormality after the stable lighting. Can be provided.

According to the thirteenth aspect of the present invention, since the stable lighting of the high pressure discharge lamp is recognized according to the lamp voltage, a high pressure discharge lamp lighting device having a simple structure can be provided.

According to the fourteenth aspect of the present invention, since the stable lighting of the high pressure discharge lamp is recognized according to the temperature of the high pressure discharge lamp, a high pressure discharge lamp lighting device capable of reliably recognizing the stable lighting is provided. You can

According to the fifteenth aspect of the present invention, since the stable lighting of the high pressure discharge lamp is recognized according to the operating time, a high pressure discharge lamp lighting device having a simple structure can be provided.

According to the sixteenth aspect of the present invention, in addition, the predetermined value of the lamp voltage is set lower than the lamp voltage after the stable lighting of the high pressure discharge lamp, so that the high pressure discharge lamp lighting device capable of reliably making an abnormality determination. Can be provided.

According to the seventeenth aspect of the invention, in addition, the lamp voltage of the high pressure discharge lamp is stored, and the value is compared with the lamp voltage after stable lighting to determine an abnormality. And manufacturer variations, specification differences, lamp voltage variations due to manufacturer differences, lamp voltage differences due to the lighting conditions of the lighting main circuit, and even changes in the lamp voltage during the life of the product. It is possible to provide a high pressure discharge lamp lighting device capable of operating.

According to the eighteenth invention, it is possible to provide an image display device having the effects of the first to seventeenth inventions.

[Brief description of drawings]

FIG. 1 is a block circuit diagram showing the concept of the present invention.

FIG. 2 is a circuit diagram showing a first embodiment of a high pressure discharge lamp lighting device of the present invention.

FIG. 3 is a circuit diagram showing a second embodiment of a high pressure discharge lamp lighting device of the present invention.

FIG. 4 is a circuit diagram showing a third embodiment of a high pressure discharge lamp lighting device of the present invention.

FIG. 5 is a circuit diagram showing a fourth embodiment of a high pressure discharge lamp lighting device of the present invention.

FIG. 6 is a partial sectional front view showing an embodiment of a high pressure discharge lamp according to the present invention.

FIG. 7 is a conceptual diagram showing an embodiment of an image display device of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... DC power supply 2 ... Lighting main circuit 3 ... Starting circuit 4 ... High-pressure discharge lamp 5 ... Lamp voltage monitoring means 6 ... Stable lighting recognition means 7 ... Abnormality determination means 8 ... Control means

Claims (18)

[Claims] 1. A lighting main circuit for lighting a high pressure discharge lamp with direct current; a starting circuit for starting the high pressure discharge lamp; lamp voltage monitoring means for monitoring the lamp voltage of the high pressure discharge lamp; stability of the high pressure discharge lamp Abnormality determining means for determining that the high-pressure discharge lamp is abnormal when the lamp voltage after lighting is lower than a predetermined value; control means for performing predetermined control when the abnormality determining means determines an abnormality; A high-pressure discharge lamp lighting device characterized by being provided. 2. The high pressure discharge lamp lighting device according to claim 1, wherein the lighting main circuit is configured to supply a predetermined lamp power to the high pressure discharge lamp in accordance with the lamp current and the lamp voltage. . 3. The lighting main circuit includes switching means,
3. The structure according to claim 1, wherein the switching means is controlled according to the lamp current and the lamp voltage to supply a predetermined lamp power to the high pressure discharge lamp.
The high pressure discharge lamp lighting device described. 4. The control means stops the power supply to the high pressure discharge lamp when an abnormality is determined.
The high pressure discharge lamp lighting device according to any one of 1. 5. The high pressure discharge lamp lighting device according to claim 1, wherein the control means displays an abnormality when the abnormality is determined. 6. The high pressure discharge lamp lighting device according to claim 1, further comprising a high pressure discharge lamp. 7. The high pressure discharge lamp lighting device according to claim 1, wherein the high pressure discharge lamp is a short arc high pressure discharge lamp. 8. The high pressure discharge lamp lighting device according to any one of claims 1 to 7, wherein the high pressure discharge lamp has an electrode distance of 6 mm or less. 9. The high pressure discharge lamp lighting device according to claim 1, wherein the high pressure discharge lamp has an electrode distance of 4 mm or less. 10. The high pressure discharge lamp lighting device according to any one of claims 1 to 9, wherein the high pressure discharge lamp is a metal halide lamp. 11. The high pressure discharge lamp lighting device according to claim 1, wherein the high pressure discharge lamp is integrally provided with a reflector. 12. The high pressure discharge lamp lighting device according to claim 1, further comprising stable lighting recognition means for recognizing stable lighting of the high pressure discharge lamp. 13. The high pressure discharge lamp lighting device according to claim 12, wherein the stable lighting recognition means recognizes stable lighting according to a terminal voltage of the high pressure discharge lamp. 14. The stable lighting recognition means recognizes stable lighting according to the temperature of the high pressure discharge lamp.
2. The high pressure discharge lamp lighting device according to 2. 15. The high pressure discharge lamp lighting device according to claim 12, wherein the stable lighting recognition means recognizes stable lighting in accordance with the operating time of the high pressure discharge lamp. 16. The high pressure discharge lamp lighting device according to claim 1, wherein the predetermined value of the lamp voltage is set lower than the lamp voltage after stable lighting of the high pressure discharge lamp. 17. The abnormality determining means is a storage means for storing the lamp voltage of the high pressure discharge lamp, a comparing means for comparing the lamp voltage obtained by the lamp voltage monitoring means with the lamp voltage stored in the storage means, and The high pressure discharge lamp lighting device according to any one of claims 1 to 16, further comprising: a determining unit that determines that the former is abnormal when the result of the comparison by the comparing unit is lower. 18. A high-pressure discharge lamp provided with a reflector; a high-pressure discharge lamp lighting device according to any one of claims 1 to 5 for lighting the high-pressure discharge lamp; Image display means for irradiating light from the back; image control means for controlling the image display means; optical system for condensing light that has passed through the image display means and projecting it on a screen; An image display device comprising: a main body case;