JP2008305568A - High-pressure discharge lamp lighting device, light source device, and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To avoid a situation that a temperature protection function is operated due to a problem of usage condition even if there is no abnormality in a projector and a component including a high pressure discharge lamp lighting device mounted in the projector. <P>SOLUTION: The high pressure discharge lamp lighting device having a high pressure discharge lamp as a load is provided with a detection part to detect a temperature of a component constituting the high pressure discharge lamp lighting device, a shutdown circuit to stop output of the high pressure discharge lamp lighting device when the detected temperature by the detection part exceeds a first threshold, and an alarm signal circuit which outputs an alarm signal for starting an alarm when the detection temperature exceeds a second threshold lower than the first threshold. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a light source device such as a projector using a high-pressure discharge lamp as a light source, and particularly to an operation of a temperature protection device due to deterioration of an air cooling state of a light source device, a malfunction of a lighting device, or a malfunction of a lamp.

A light source device such as a projector using a high-pressure discharge lamp as a light source (hereinafter generally referred to as a light source device) has a large lamp temperature rise when the lamp is turned on, and the optical system device inside the light source device, the control board, and the like become hot. Usually, the lamp is used while being air-cooled by a DC fan or the like.
In addition, a high pressure discharge lamp lighting device (hereinafter generally referred to as a lighting device) provided inside a light source device for lighting a high pressure discharge lamp serving as a light source also raises the component temperature due to heat generated during the lighting operation. In need of.

Usually, such a light source device has means for detecting the temperature of a power supply unit including a high-pressure discharge lamp and a lighting device. When the detected temperature exceeds a certain threshold value for some reason, the lamp is turned off. And a function of stopping the output of the light source device (for example, Patent Document 1).
In Patent Document 1, in a light source device having a blower fan, a temperature sensor is provided at each point on the blower path, and the rotational speed of the blower fan is controlled according to each detected temperature. When the temperature reaches the emergency stop temperature, the main power supply is turned off or the lamp is turned off.

In addition, the lighting device provided in the light source device has a component temperature detection means in the lighting device itself, and stops the lamp lighting output when the detected temperature of the component exceeds a certain threshold value. Some have the function to do.
This function is a so-called temperature protection function that works in the event of an abnormality such as a lamp failure, lighting device failure, or air cooling fan stop, resulting in the prevention or use of other components due to an abnormal rise in the internal temperature of the light source device. Prevents people from becoming in danger.

However, this function works when there is no abnormality in the components inside the light source device, and the user may feel inconvenience.
The following is an explanation of the unique situation that causes inconvenience.

  Generally, inside the light source device, a high-pressure discharge lamp serving as the light source and a heat generating component called a power supply unit including a lighting device for lighting the high-pressure discharge lamp are arranged, and each is cooled by an air cooling fan. Yes.

This air-cooling fan of the light source device has specifications of the light source device, such as when both the lamp and power supply unit are air-cooled, or when the lamp and power supply unit are individually air-cooled by multiple fans. However, air intake holes for uniformly taking in air for air cooling and ventilation holes for exhaust holes for discharging air from the light source device are opened in the side surface and bottom surface of the light source device.
In normal use, the temperature of the lamp and the power supply unit is stabilized by sucking and exhausting air from the ventilation hole and appropriately cooling the lamp and the power supply unit inside the light source device.

  However, if a user accidentally puts an object near the ventilation hole and the air flow deteriorates, or if the light source device is installed near the wall or the like, the ventilation hole is placed on the wall. It is thought that it will be blocked. In this case, the air flow for air cooling deteriorates, and the heat generating components such as the lamp and the power supply unit are not properly air cooled, and the temperature of the heat generating components rises, and eventually the temperature exceeds a certain threshold as described above. The light source device and the lighting device stop the output.

  In other words, even though there are no abnormalities in the lamps and power supply components that are components of the light source device, not only does the light source device fail to perform its function, but the normal lamps and power supply units are exposed to high temperatures. This adversely affects the life of the parts. In general, when such a temperature protection function is activated, the power supply must be completely shut off once by unplugging the outlet plug of the light source device, and the temperature of the temperature detection unit is also present. If it does not drop below the threshold value, it cannot operate again.

For this reason, once the lighting device or light source device has stopped its output due to the temperature protection function, it is possible to remove objects that have been accidentally placed near the ventilation holes by the user or change the installation status of the light source device. Even if the air cooling condition is improved, the light source device cannot be operated again until the temperature of the temperature detection unit falls below a certain threshold value, which causes inconvenience.
JP 2006-301368 A

  Generally, a projector or a high-pressure discharge lamp lighting device mounted inside the projector has a function of detecting an abnormal temperature rise of components during normal use and stopping the operation, that is, a temperature protection function. However, this function distinguishes between temperature rises caused by actual component failures and parts abnormalities and temperature rises caused by deterioration of air-cooling conditions such as blocking air-cooling ventilation holes or placing objects near the ventilation holes. It is impossible to do.

  An object of the present invention is to avoid a situation in which a temperature protection function is activated due to a problem in its use conditions even though there is no abnormality in a projector or a component including a high-pressure discharge lamp lighting device mounted inside the projector. It is in.

According to a first aspect of the present invention, in a high pressure discharge lamp lighting device having a high pressure discharge lamp as a load, a detection unit for detecting a temperature of a component constituting the high pressure discharge lamp lighting device, and a temperature detected by the detection unit is a first threshold value A stop circuit that stops the output of the high-pressure discharge lamp lighting device when exceeding the threshold value, and an alarm signal that outputs an alarm signal for starting an alarm when the detected temperature exceeds a second threshold value that is lower than the first threshold value A high-pressure discharge lamp lighting device provided with a circuit.
Further, the alarm signal circuit is configured to stop the alarm signal when the detected temperature exceeds the second threshold and then falls below the third threshold.
Furthermore, a dimming circuit to which an alarm signal is input may be provided, and dimming lighting may be performed by the dimming circuit during a period in which the alarm signal is output.

  A second aspect of the present invention is a light source device using a high-pressure discharge lamp as a light source, and the high-pressure discharge lamp lighting device according to the first aspect and the high-pressure discharge lamp is turned off while an alarm signal is generated. It is a light source device provided with alarm means for outputting an alarm informing the possibility.

According to a third aspect of the present invention, in a light source device using a high-pressure discharge lamp as a light source, a detection means for detecting the temperature inside the light source device, and the high-pressure discharge lamp is turned off when the temperature detected by the detection means exceeds a first threshold value. And a warning signal means for outputting a warning signal indicating that there is a possibility of turning off when the detected temperature exceeds a second threshold value lower than the first threshold value.
Further, the alarm signal means is configured to stop outputting the alarm when the detected temperature falls below the third threshold value after exceeding the second threshold value.
Here, the temperature detecting means may be arranged around the high pressure discharge lamp or the high pressure discharge lamp.
Furthermore, a dimming unit connected to the alarm signal unit may be provided, and the high pressure discharge lamp may be dimmed and lit by the dimming unit during a period in which the alarm is output.

  A fourth aspect of the present invention is a method for controlling a light source device using a high-pressure discharge lamp as a light source, and the light source device includes a detection means for outputting a detection temperature, an alarm means for inputting the detection temperature, and a light-off means. (A) a step in which the detecting means detects the temperature inside the light source device; (B) when the detected temperature exceeds the alarm start temperature (T2), the alarm means may inform the high pressure discharge lamp to be extinguished. The control method includes a step of outputting an alarm, and (C) a step of turning off the high-pressure discharge lamp by the extinguishing means when the detected temperature exceeds a protection temperature (T1) higher than the alarm start temperature (T2).

According to a fifth aspect of the present invention, there is provided a method for controlling a light source device using a high-pressure discharge lamp as a light source, the light source device including a detection unit that outputs a detection temperature and an alarm unit that receives the detection temperature. ) A step in which the detecting means detects the temperature inside the light source device; (B1) when the detected temperature exceeds the alarm start temperature (T2), an alarm is output informing that the alarm means may turn off the high-pressure discharge lamp. And (B2) a control method comprising a step in which the alarm means stops the alarm when the detected temperature falls below the alarm end temperature (T3).
Further, in the fourth and fifth aspects, the light source device may be provided with a dimming unit, and the dimming lighting may be performed by the dimming unit while an alarm is output.

  According to the present invention, the light source device is used under a condition where the air cooling condition is bad, and the output stops suddenly even if the temperature inside the light source device or the temperature of the mounted high pressure discharge lamp lighting device rises abnormally. Without warning. Therefore, the user can improve the air cooling conditions of the light source device before the output of the light source device stops. As a result, the temperature inside the light source device and the temperature of the high pressure discharge lamp lighting device are improved to the normal temperature, and the light source device can be used continuously.

<Outline of the present invention>
In the present invention, an alarm signal is output when the temperature of the temperature detection unit of the high pressure discharge lamp lighting device mounted on the light source device exceeds the first threshold, and the light source device outputs an alarm in response to the alarm signal. There are two configurations: a configuration and a configuration that outputs an alarm when the temperature of the temperature detection unit of the light source device exceeds the first threshold, both of which detect the temperature rise of the temperature detection unit due to deterioration of air cooling conditions The concept is the same in that the light source device finally outputs an alarm. Accordingly, a description will be given below of a configuration in which an abnormal rise in temperature of the temperature detection unit of the lighting device is detected and an alarm signal is output, and the light source device outputs an alarm in response to the alarm signal.

  FIG. 1 is a diagram showing the relationship between the temperature detection unit temperature of a high pressure discharge lamp lighting device (hereinafter referred to as “lighting device”) and the output of the light source device during normal lighting. The temperature detection unit temperature of the lighting device rises immediately after the start of the operation and becomes stable at the steady temperature T0.

  In the conventional lighting device, as shown in FIG. 7, when the temperature detection unit temperature of the lighting device rises for some reason during normal operation and reaches the first threshold value T1, the output is stopped. As a result, the light source device also Output was stopped.

  In the present invention, a second threshold value T2 lower than the first threshold value T1 is set, and when the temperature detection unit temperature of the light source device exceeds T2, the light source device outputs an alarm signal. When the temperature detection unit temperature falls below the third threshold value T3, the output of the alarm signal is stopped.

  Therefore, if the lighting device outputs an alarm signal and the light source device outputs an alarm, the user can improve the air cooling condition of the light source device and the temperature detection unit temperature can be lowered. The relationship between the head temperature, the alarm signal output of the lighting device, and the output of the light source device is expressed as shown in FIG. 2, the temperature detection unit temperature is again stabilized at the steady temperature T0, and the light source device continues to output. Become.

  In consideration of the output of the alarm signal and the stable operation of stopping the output, it is desirable that the third threshold T3 is set in the range of T0 <T3 <T2.

  Here, it is about the alarm which a light source device outputs, but this should just be what a user notices that the air cooling conditions and installation conditions of a light source device are getting worse. Something that can be recognized. For example, an alarm sound or voice notification may be used, or a message prompting the user to confirm the air cooling condition may be displayed in the output screen.

  In addition, even if the lighting device outputs a warning signal as described above, if the air cooling condition is not improved, or if the temperature detection unit temperature continues to rise because the lighting device is actually abnormal, As shown in FIG. 3, the temperature detection unit temperature eventually reaches the first threshold value T1, and as a result, the lighting device stops outputting, and the light source device alarm and output are also stopped.

<Example 1>
In consideration of the above, the inventors designed the following high-pressure discharge lamp lighting device as a preferred embodiment of the present invention.
The temperature detection unit is a heat sink part to which a semiconductor as a heat generating component is fixed, and the first threshold value of the heat sink part temperature is 110 ° C. The second threshold is 105 ° C., and the third threshold is 100 ° C. Note that the temperature T0 of the heat sink during normal operation of the lighting device is about 90 ° C.
At this time, the light source device that has received the warning signal output by the lighting device outputs a warning, but the warning is displayed on the screen, and a message is displayed in the corner of the screen that it is necessary to check whether there is a problem with air cooling. Is configured to flash.

<Example 2>
The first embodiment is configured to receive a warning signal output from the lighting device, and the light source device outputs a warning. As the second embodiment, a light source device that outputs a warning due to a rise in temperature of the temperature detection unit inside the light source device. Designed.
The temperature detector is a heat shield plate inside the light source device close to the lamp housing. The first threshold value T1 of the heat shield plate temperature is set to 130 ° C., the second threshold value T2 is set to 120 ° C., and the third threshold value is set. T3 is set to 110 ° C. The temperature T0 of the heat shield plate during normal operation of the light source device is about 100 ° C.
The alarm output from the light source device is configured such that an alarm sound is emitted from the light source device in addition to the method of notifying the alarm described in the first embodiment on the screen.

<Outline configuration>
4 and 5 are representative block diagrams of the present invention.
FIG. 4 shows a configuration in which an alarm signal is output when the temperature of the temperature detection unit of the lighting device mounted on the light source device exceeds a first threshold value. In the figure, 10 is a power source, 20 is a high-pressure discharge lamp, and the lighting device 30 converts the power from the power source 10 into an appropriate lighting current waveform (for example, an AC rectangular wave current of several hundreds of Hz, etc.) for high-pressure discharge. Supply to the lamp 20. When the temperature detected by the temperature detector 31 (for example, a circuit including a thermistor) exceeds the threshold value T2, the output of the alarm signal circuit 32 is started and the alarm signal is input to the alarm means 40. When the alarm signal is output, the threshold value switching means 33 in the alarm signal circuit 32 switches the threshold value from T2 to T3.

  Thereafter, when the detected temperature decreases and the detected temperature falls below the threshold value T3, the alarm signal is stopped. On the other hand, when the detected temperature exceeds the threshold value T2 and further rises and exceeds the threshold value T1, the stop circuit 34 turns off the high-pressure discharge lamp 20 by, for example, stopping the driver circuit 35 of the lighting device 30.

  FIG. 5 shows a configuration for outputting an alarm when the temperature of the temperature detection unit of the light source device exceeds the first threshold. In the figure, 10 is a power source, 20 is a high-pressure discharge lamp, and the lighting device 51 converts the power from the power source 10 into an appropriate lighting current waveform (for example, an AC rectangular wave current of several hundreds of Hz, etc.) for high-pressure discharge. Supply to the lamp 20. When the temperature detected by the temperature detection means 52 (for example, a circuit including a thermistor) disposed near the high-pressure discharge lamp 20 exceeds a threshold T2, an alarm signal is output in the alarm signal means 53 and input to the alarm means 54. The alarm means 54 receives a warning signal and starts a predetermined warning. After the alarm is generated, the threshold value switching means 55 in the alarm signal means 53 switches the threshold value from T2 to T3.

  Thereafter, when the detected temperature decreases and the detected temperature falls below the threshold value T3, the alarm is stopped. On the other hand, when the detected temperature exceeds the threshold T2 and further rises and exceeds the threshold T1, the extinguishing means 56 extinguishes the high-pressure discharge lamp 20 by stopping the driver circuit 57 of the lighting device 51, for example. . Note that, as the light-off method, instead of stopping the driver circuit 57, for example, the input of the power supply 10 may be cut off.

  Although FIG. 4 and FIG. 5 are block diagrams of the circuit configuration or the light source device, a method for realizing a detailed circuit or the like is not limited thereto. In each figure, a comparator is used for temperature comparison and its input is a temperature for clarification of explanation, but in actuality, these temperatures are converted into voltage values and compared.

In addition, as shown in FIG. 6, the lighting device 30 is provided with a light control circuit 36, and during the alarm, the output of the lighting device is adjusted to a light control output (for example, a light control output of about 80 to 90%) so as not to disturb viewing. It is also possible to reduce heat generation from the high-pressure discharge lamp. As a result, after the alarm is generated, the opportunity for the user to complete the response before the detected temperature reaches T1 can be increased, and the time for the detected temperature to drop to T3 after the user completes the response is shortened. It is also possible to obtain a normal use state quickly.
Naturally, the configuration having the same purpose as in FIG. 6 can be included in FIG. 5 (that is, the dimming means connected to the alarm signal means 53 is provided outside or inside the lighting device 51).

  As a measure of light control%, 50% or more is a level at which the minimum information transmission is possible even though the image is dark, and 65% or more is a permissible level for several minutes although the image is somewhat dark. 80% or more is necessary as a level that hardly affects. Therefore, the lower limit of dimming during the alarm issuance can be selected as appropriate according to the purpose and application of the content to be shown.

  From the above, even if it is used under conditions where the air cooling condition is poor due to usage conditions or installation conditions, a built-in high pressure discharge lamp lighting device that outputs an alarm signal before the output stops due to abnormal temperature rise is stopped. It is possible to obtain a light source device such as a projector that outputs an alarm prompting improvement of the air cooling condition before. Therefore, the user can improve the air cooling condition before stopping the output of the light source device such as the projector, and can continue to use the light source device such as the projector.

  The utilization of the present invention is mainly used for light source devices such as projectors, projection TVs, and projectors.

It is a figure explaining a normal lighting state. It is a figure explaining operation | movement of this invention. It is a figure explaining operation | movement of this invention. It is a block diagram which shows the outline of this invention. It is a block diagram which shows the outline of this invention. It is a block diagram which shows the outline of this invention. It is a figure explaining a prior art.

Explanation of symbols

T0: Temperature detection unit temperature during normal operation T1: Temperature detection unit temperature at which output of the high pressure discharge lamp lighting device stops due to an abnormal temperature rise (first threshold)
T2: Temperature detection unit temperature (second threshold) at which the high pressure discharge lamp lighting device outputs an alarm signal
T3: Temperature detection unit temperature at which the high pressure discharge lamp lighting device stops outputting the alarm signal (third threshold)
10: Power supply 20: High pressure discharge lamp 30: Lighting device 31: Temperature detector 32: Alarm signal circuit 33: Threshold signal switching circuit 34: Stop circuit 35: Driver circuit 36: Dimming circuit 40: Alarm means 50: Light source device 51: Lighting device 52: temperature detection means 53: alarm signal means 54: alarm means 55: threshold value switching means 56: extinguishing means 57: driver circuit

Claims (11)

In a high pressure discharge lamp lighting device having a high pressure discharge lamp as a load,
A detection unit for detecting the temperature of the parts constituting the high-pressure discharge lamp lighting device;
A stop circuit that stops the output of the high-pressure discharge lamp lighting device when the detection temperature by the detection unit exceeds a first threshold, and when the detection temperature exceeds a second threshold lower than the first threshold, A high pressure discharge lamp lighting device comprising an alarm signal circuit for outputting an alarm signal for starting an alarm.   2. The high pressure discharge lamp lighting device according to claim 1, wherein the alarm signal circuit is configured to stop the alarm signal when the detected temperature exceeds the second threshold and then falls below a third threshold. Discharge lamp lighting device. The high pressure discharge lamp lighting device according to claim 1 or 2, further comprising a dimming circuit to which the alarm signal is input,
A high pressure discharge lamp lighting device configured to perform dimming lighting by the dimming circuit during a period in which the alarm signal is output. A light source device using a high-pressure discharge lamp as a light source,
The high pressure discharge lamp lighting device according to any one of claims 1 to 3, and an alarm means for outputting an alarm notifying that the high pressure discharge lamp is extinguished while the alarm signal is generated. Light source device. In a light source device using a high-pressure discharge lamp as a light source,
Detecting means for detecting the temperature inside the light source device;
Extinguishing means for extinguishing the high-pressure discharge lamp when the temperature detected by the detecting means exceeds a first threshold, and possibility of extinguishing when the detected temperature exceeds a second threshold lower than the first threshold A light source device comprising an alarm signal means for outputting an alarm informing that there is an alarm.   6. The light source device according to claim 5, wherein the alarm signal means is configured to stop the output of the alarm when the detected temperature falls below a third threshold value after exceeding the second threshold value.   7. The light source device according to claim 5, wherein the temperature detecting means is arranged around a high pressure discharge lamp or a high pressure discharge lamp. The light source device according to any one of claims 5 to 7, further comprising a light control unit connected to the alarm signal unit,
A light source device configured so that the high-pressure discharge lamp is dimmed and lit by the dimming means during a period in which the alarm is output. A method for controlling a light source device using a high-pressure discharge lamp as a light source, the light source device comprising: a detection means for outputting a detection temperature; an alarm means for inputting the detection temperature;
(A) the detection means detecting the temperature inside the light source device;
(B) outputting an alarm notifying that the alarm means may turn off the high-pressure discharge lamp when the detected temperature exceeds an alarm start temperature (T2); and (C) the detected temperature is A control method comprising the step of turning off the high-pressure discharge lamp by the turn-off means when a protection temperature (T1) higher than the alarm start temperature (T2) is exceeded. A method of controlling a light source device using a high-pressure discharge lamp as a light source, the light source device comprising a detection means for outputting a detected temperature and an alarm means for inputting the detected temperature,
(A) the detection means detecting the temperature inside the light source device;
(B1) outputting an alarm notifying that the alarm means may turn off the high-pressure discharge lamp when the detected temperature exceeds an alarm start temperature (T2); and (B2) the detected temperature is A control method comprising the step of the alarm means stopping the alarm when the alarm end temperature (T3) falls below. The control method according to claim 9 or 10, wherein the light source device further includes dimming means,
A control method in which dimming lighting is performed by the dimming means while the alarm is output.

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