JP2011022431A - Projection display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection display device including a cooling means capable of reducing heat load of a reflection mirror, constituted of as a small number of fans as possible in a multi-light type light source device and operable without always operating the fans. <P>SOLUTION: The projection display device includes: a light intensity-uniformizing means 6 uniformizing intensity distribution of incident luminous flux and emitting the luminous flux; a first light source 1 installed out of an incident axis of the light intensity-uniformizing means 6 and emitting first luminous flux; a second light source 2 installed on the incident axis of the light intensity-uniformizing means 6 and emitting second luminous flux; bending means 3 and 7 bending the first luminous flux in a direction where they make it incident on the light intensity-uniformizing means 6; and the cooling means cooling the bending means 3 and 7. The cooling means includes heat radiation means 11 and 12 performing heat radiation of the bending means 3 and 7, a blower means 16 sending cooling air to the heat radiation means 11 and 12, and an air-sending control means 41 controlling the blower means 16. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projection display device using a plurality of light source lamps.

  In order to realize a large screen and high brightness of an image, a multi-lamp type light source device that includes a plurality of light source lamps and combines the light beams emitted from the plurality of light source lamps to increase the brightness is provided. A projection display device has been proposed (see Patent Document 1).

  In a projection display device equipped with such a multi-lamp type light source device, a reflection mirror is used in an optical system for combining light beams emitted from a plurality of light source lamps, but in order to reduce the thermal load received by the reflection mirror. As a heat dissipating means, a configuration in which a streak-like rib is formed on the back surface has been proposed (see Patent Document 2).

  In addition, a means for cooling the reflection mirror with cooling air from the fan has been proposed (see Patent Document 3).

JP 2001-359025 A (page 8, FIG. 1) JP 2008-225331 A (page 8, FIG. 4) Japanese Patent Laying-Open No. 2006-337940 (page 8, FIG. 1)

  As the brightness of the light source lamp is increased, the thermal load of the reflecting mirror tends to increase more and more. In order to ensure the reliability of the reflective coat of the reflective mirror and the glass substrate, it is necessary to improve the heat resistance of the reflective coat or to select a glass substrate with high heat resistance, which increases the cost. It was.

  Moreover, if the reflection efficiency of the reflection coat decreases due to some reason, the amount of heat received by the reflection mirror increases and the heat load increases, which causes a vicious cycle in which the decrease in reflection efficiency accelerates, causing the reflection mirror to reach an unexpectedly high temperature. As a result, there is a problem that the reflecting mirror and surrounding components are damaged.

  For this reason, it is necessary to provide a cooling means for cooling the reflecting mirror. However, when a fan for cooling the reflecting mirror is added, there is a problem in that the noise of the entire apparatus increases if the fan is always operated.

  In view of the above-described problems, the present invention reduces the thermal load of the reflection mirror that can be configured with as few fans as possible when a multi-lamp type light source device is provided, and can operate without always operating the fans. An object of the present invention is to provide a projection display device provided with a cooling means.

  The projection display apparatus according to the present invention includes a light intensity uniformizing unit that uniformizes and emits an intensity distribution of an incident light beam, and a first light source that is disposed outside the incident axis of the light intensity uniformizing unit and emits a first light beam. A second light source installed on the incident axis of the light intensity uniformizing means and emitting a second light beam, a bending means for folding the first light flux in a direction to enter the light intensity uniformizing means, and a cooling means for cooling the bending means The cooling means includes a heat radiating means for radiating the bending means, a blower means for sending cooling air to the heat radiating means, and a blower control means for controlling the blower means.

  The projection display device of the present invention comprises a folding means for folding the first light flux in the direction of incidence on the light intensity uniformizing means, and a cooling means for cooling the bending means, and the cooling means radiates heat to radiate the bending means. Means, air blowing means for sending cooling air to the heat radiating means, and air blowing control means for controlling the air blowing means. By cooling the bending means with cooling air, it is possible to prevent a decrease in reflectance due to the heat load of the bending means and maintain stable performance over a long period of time. Further, the second light source is installed on the incident axis of the light intensity uniformizing means, so that the cooling means can be configured with as few fans as possible when a multi-light type light source device is provided, and the fans are always connected. The projection display device can operate without being operated.

1 is a plan view showing a configuration of a projection display device according to Embodiment 1. FIG. 1 is a perspective view showing a configuration of a projection display apparatus according to Embodiment 1. FIG. FIG. 3 is a perspective view showing a configuration around a reflecting mirror according to the first embodiment. 1 is a perspective view showing a configuration of a projection display apparatus according to Embodiment 1. FIG. 5 is a perspective view showing a configuration around a reflecting mirror according to Embodiments 2 and 3. FIG. 5 is a perspective view showing a configuration around a reflecting mirror according to Embodiments 2 and 3. FIG. 5 is a perspective view showing a configuration of a projection display device according to Embodiments 2 and 3. FIG.

(Embodiment 1)
<Configuration>
1 to 4 are diagrams for explaining the projection display apparatus according to the first embodiment. FIG. 1 is a plan view showing the arrangement of the optical elements of the projection display apparatus together with the optical axis of the light beam, and FIG. 2 is a perspective view showing the arrangement of the optical elements.

  The projection display device includes a first light source 1, a second light source 2, and a plurality of light sources, and further includes a first reflection mirror 3, a second reflection mirror 7, a relay optical system 101, a glass rod 6, an image display element 8, A projection lens 9 is provided. The first reflecting mirror 3 is a bending unit that bends the first light beam emitted from the first light source 1 in the direction of the second light source 2. The relay optical system 101 includes a first relay lens 4 and a second relay lens 5, and guides the first light beam reflected by the first reflecting mirror 3 to the second reflecting mirror 7. The second reflecting mirror 7 is a bending unit that bends the first light beam guided by the relay optical system 101 to the incident end 61 of the glass rod 6. The glass rod 6 is a means for equalizing the intensity of the light incident from the incident end 61 and equalizing the light intensity emitted from the output end 62. The image display element 8 modulates the light beam emitted from the emission end 62 of the glass rod 6 and converts it into image light. The projection lens 9 enlarges and displays the image light from the image display element 8 on the screen 10.

  FIG. 3 is a perspective view showing a configuration around the reflecting mirrors 3 and 7. The projection display device includes a first heat radiating means 11, a second heat radiating means 12, an air path forming body 13, and a blower fan 16 as cooling means for cooling the reflection mirrors 3 and 7. The first heat dissipating means 11 holds the first reflecting mirror 3 to dissipate the heat, and the second heat dissipating means holds the second reflecting mirror 7 to dissipate the heat. Further, the blower fan 16 cools the first reflection mirror 3 from the first blower opening 14 and the second reflection mirror 7 from the second blower opening 15 by sending cooling air to the air passage forming body 13 connected thereto. To do.

  FIG. 4 is a perspective view showing the overall configuration of the projection display apparatus. The projection display device further includes first lighting driving means 31, second lighting driving means 32, lighting control means 50, and air blowing control means 41. The first lighting driving means 31 is means for supplying and driving power to the first light source 1, and the second lighting driving means 32 is means for supplying and driving power to the second light source 2. The lighting control unit 50 controls the lighting driving units 31 and 32 to control lighting / extinguishing of the first light source 1 and the second light source 2. The air blowing control means 41 supplies electric power to the air blowing fan 16 and controls its operation. The lighting control means 50 is electrically connected by the first lighting driving means 31 and the wiring 51, by the second lighting driving means 32 and the wiring 52, and by the air blowing control means 41 and the wiring 53. The first lighting driving means 31 is electrically connected to the first light source by the wiring 33, and the second lighting driving means 32 is electrically connected to the second light source by the wiring 34. The air blowing control means 41 is electrically connected to the air blowing fan 16 by the wiring 42.

<Operation>
Next, the operation of the projection display apparatus according to the present embodiment will be described. When the projection display device is operated to display an image on the screen 10, the blower control unit 41 first drives the blower fan 16 in response to an operation of an operation button (not shown). By the operation of the blower fan 16, the cooling air is blown from the first blower port 14 of the air passage forming body 13 to the first heat radiating unit 11 and from the second blower port 15 to the second heat radiating unit 12. Cooling of the second reflecting mirror 7 is started.

  After a predetermined time has elapsed since the air blowing control means 41 drives the air blowing fan 16, the lighting control means 50 instructs the first lighting driving means 31 to turn on. Then, the 1st lighting drive means 31 is transmitted to the 1st light source 1 through the electric wire 33 for 1st light sources, and makes it light. The first light flux from the first light source 1 is bent at a substantially right angle in the optical axis direction of the second light source 2 by the first reflection mirror 6 and guided to the second reflection mirror 7 via the relay lens optical system 101. Further, the first light beam is bent at a substantially right angle by the second reflecting mirror and enters the incident end 61 of the glass rod 6.

  After a predetermined time has elapsed since the first light source 1 is driven to turn on, the lighting control unit 50 instructs the second lighting driving unit 32 to turn on. Then, the second lighting drive means 32 transmits power to the second light source 2 through the second light source electric wire 34 and lights it. The second light beam from the second light source 2 is directly incident on the incident end 61 of the glass rod 6 without passing through the reflection mirror. The first light flux and the second light flux are combined in the glass rod 6 and emitted from the emission end 62 toward the image display element 8. The image display element 8 bends the light beam by a predetermined angle and guides it to the projection lens 9. The guided light beam is emitted from the projection lens unit 9 toward the screen 10 and is enlarged and displayed on the screen 10. Since the brightness of the image on the screen 10 is a combination of the brightness of the first light source 1 and the second light source 2, it is possible to display a high-luminance image.

  When the operation of the projection display device is stopped, the lighting control unit 50 instructs the first lighting driving unit 31 and the second lighting driving unit 32 to turn off in response to an operation button (not shown). Then, the 1st lighting drive means 31 and the 2nd lighting drive means 32 respectively stop the power supply to the 1st light source 1 and the 2nd light source 2, and make it light-extinguish.

  The blower control unit 41 stops the blower fan 16 when a predetermined time has elapsed after the first light source 1 is turned off.

  In the above description, the projection display apparatus operates with the first light source 1 and the second light source 2 turned on. However, only one of the first light source 1 and the second light source 2 is turned on. Also good. When only the first light source 1 is turned on, the same operation as described above is performed. That is, the air blowing control means 41 drives the air blowing fan 16 and starts cooling the first reflecting mirror 3 and the second reflecting mirror 7. Thereafter, when a predetermined time has elapsed, the lighting control means 50 turns on the first light source 1. When the first light source 1 is turned off, the blowing control means 41 stops the blowing fan 16 after a predetermined time has elapsed.

  When only the second light source 2 is turned on, the reflection mirrors 3 and 7 do not receive a heat load from the first light source 1 and therefore do not reach a high temperature. Therefore, the blower control unit 41 does not drive the blower fan 16, and the lighting control unit 50 turns on the second light source 2. As described above, since the blower fan 16 does not operate in the operation mode in which the first light source 1 is not turned on, the noise of the projection display device can be reduced and the power consumption can be suppressed.

<Effect>
The projection display apparatus according to Embodiment 1 has the following effects. In other words, the projection display device has a light intensity uniformizing means (glass rod 6) for uniforming the intensity distribution of the incident light beam and emitting it, and a first light beam that is installed outside the incident axis of the glass rod 6 and emits the first light beam. A light source, a second light source that is disposed on an incident axis of the light intensity uniformizing unit and emits a second light beam, a bending unit that bends the first light beam in a direction to enter the light intensity uniformizing unit, and a bending unit; A cooling means for cooling, the cooling means comprising: a heat radiating means for radiating the bending means; a blower means for sending cooling air to the heat radiating means (blower fan 16); and a blower control means 41 for controlling the blower means. Prepare. By cooling the bending means with cooling air, it is possible to prevent a decrease in reflectance due to the heat load of the bending means and maintain stable performance over a long period of time.

  The first light source 1 is installed substantially parallel to the second light source 2, and the bending means includes a first reflecting mirror 3 for reflecting the first light beam emitted from the first light source in the direction of the second light beam, And a second reflecting mirror that reflects the first light flux reflected by the first reflecting mirror 3 in the direction of incidence on the light intensity uniformizing means (glass rod 6), and the heat radiating means radiates heat from the first reflecting mirror 3. A first heat radiating means 11 and a second heat radiating means 12 for radiating heat from the second reflecting mirror 7, and a wind that guides cooling air from the air blowing means (air blowing fan 16) to the first heat radiating means 11 and the second heat radiating means 12. A path former 13 is further provided. The cooling air is blown to the first heat radiating means 11 and the second heat radiating means 12 through the air path forming body 13, whereby the reflecting mirrors 3 and 7 are cooled, respectively, and stable performance can be maintained over a long period of time.

  Further, the air blowing control means 41 starts the air blowing in response to the user's operation, the first light source 1 is turned on after the elapse of a predetermined time of the air blowing start, and the air blowing control means 41 is turned off after the first light source 1 is turned off. The air blowing is stopped after a predetermined period of time has elapsed. As described above, the reflecting mirrors 3 and 7 are cooled before the first light source 1 is turned on to prepare for a heat load caused by turning on the first light source 1, and are continuously predetermined even after the first light source 1 is turned off. Since it is cooled for a long time, even if there is a high-temperature member in the vicinity, the temperature is not excessively high, and high reliability that can maintain stable performance over a long period of time can be obtained.

(Embodiment 2)
<Configuration>
In the projection display device according to the first embodiment, the blower fan 16 sends a certain amount of cooling air. However, in the projection display device according to the second embodiment, depending on the temperature near the reflection mirrors 3 and 7. Control the air volume of the cooling air.

  The projection display apparatus according to the second embodiment includes means for detecting the temperature in the vicinity of the reflection mirrors 3 and 7 in addition to the configuration of the projection display apparatus according to the first embodiment shown in FIGS. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.

  5 to 7 are diagrams for explaining the projection display apparatus according to the second embodiment. FIG. 5 is a perspective view showing the configuration in the vicinity of the first reflection mirror 3, and FIG. 6 is a perspective view showing the configuration in the vicinity of the second reflection mirror 7. FIG. 7 is a perspective view showing the overall configuration of the projection display apparatus. In these drawings, the same components as those in the first embodiment are denoted by the same reference numerals.

  As shown in FIG. 5, the projection display apparatus includes first temperature detection means 21 that detects the temperature in the vicinity of the first reflection mirror 3, and the first temperature detection means 21 detects to the temperature control means 41 via the electric wire 22. Transmit the signal. Further, as shown in FIG. 6, the projection display device includes second temperature detection means 23 for detecting the temperature in the vicinity of the second reflection mirror 7, and the second temperature detection means 23 is temperature controlled via an electric wire 24. A detection signal is transmitted to the means 41. Since the other configuration is the same as that of the first embodiment, the description thereof is omitted.

<Operation>
Next, the operation of the projection display apparatus according to the second embodiment will be described. First, after the operation of an operation button (not shown) is received as in the first embodiment, the air blowing control unit 41 drives the air blowing fan 16 and cools the reflecting mirrors 3 and 7 for a predetermined time, and then the first light source 1 and The second light source 2 is turned on in order. The air blowing control means 41 detects the temperature in the vicinity of the reflecting mirrors 3 and 7 by the first temperature detecting means 21 and the second temperature detecting means 23, and if any temperature becomes higher than a predetermined value, the air blowing fan 16 Increase the number of rotations to increase the air flow and increase the cooling capacity. On the other hand, when the temperature is maintained at a temperature lower than the predetermined value, control is performed so as to reduce the rotation rate of the blower fan 16 to suppress the blown amount.

  Next, when stopping the operation of the projection display device, the lighting control means 50 instructs the first lighting driving means 31 and the second lighting driving means 32 to turn off in response to the operation of an operation button (not shown). Then, the power supply to the light sources 1 and 2 is stopped and the light sources 1 and 2 are turned off. The air blowing control means 41 detects the temperature in the vicinity of the first reflection mirror 3 by the first temperature detection means 21 and the temperature in the vicinity of the second reflection mirror by the second temperature detection means 23, and these temperatures are below a predetermined value. If it falls, it will control so that the ventilation fan 16 will be stopped.

  In addition, although the case where the projection display apparatus operates by turning on the first light source 1 and the second light source 2 respectively, only one of the first light source 1 and the second light source 2 may be turned on.

  In addition, although the air path forming body 13 is configured so that the cooling air generated by one air blowing fan 16 branches to the first air blowing port 14 and the second air blowing port 15, the first heat radiating means 11 and the second heat radiating means. If a dedicated blower fan corresponding to each of 12 and an air passage forming body connected thereto are provided, the air volume is individually controlled corresponding to the detected values of the first temperature detecting means 21 and the second temperature detecting means 23. It is also possible to do.

<Effect>
The projection display device according to Embodiment 2 has the following effects. That is, the projection display device further includes first temperature detection means 21 that detects the temperature near the first reflection mirror 3 and second temperature detection means 23 that detects the temperature near the second reflection mirror 7. The air blowing control means 53 controls the air volume of the air blowing means (the air blowing fan 12) according to the temperature detection values of the first temperature detecting means 21 and the second temperature detecting means 23. When the temperature in the vicinity of the reflection mirrors 3 and 7 is lower than a predetermined value, the air blowing control means 41 can control to reduce the rotational speed of the air blowing fan 16, thereby contributing to reducing the noise of the projection display device, In addition, power consumption can be suppressed.

  The air blowing control unit 53 stops the air blowing when the temperature detection values of the first temperature detecting unit 21 and the second temperature detecting unit 23 are equal to or lower than a predetermined value after the first light source 1 is turned off. Thereby, the operation of the projection display apparatus can be completed in a shorter time without causing damage to the reflection mirrors 3 and 7 due to heat.

(Embodiment 3)
<Configuration>
In the projection display device of the second embodiment, the air volume of the blower fan 16 is adjusted according to the detected temperature in the vicinity of the reflection mirrors 3 and 7 and controlled so that the reflection mirrors 3 and 7 do not reach a high temperature. In Embodiment 3, it is assumed that the reflecting mirrors 3 and 7 are heated to a temperature exceeding the adjustment amount of the blower fan 16, and the reflection mirror is obtained by lowering the light emission amount of the first light source 1 in addition to adjusting the air amount of the blower fan 16. Control to reduce the heat load of 3 and 7 is performed.

  The configuration of the projection display apparatus according to the third embodiment is the same as that of the projection display apparatus according to the second embodiment shown in FIGS.

<Operation>
As in the second embodiment, the air blowing control means 41 controls the air volume of the air blowing fan 16 by the temperature detection value near the reflecting mirrors 3 and 7. However, when the temperature in the vicinity of the reflecting mirrors 3 and 7 becomes unexpectedly high and exceeds the adjustment amount of the blower fan 16, the lighting control means 50 controls the first light source 1 to diminish the predetermined light amount. The amount of heat received by the reflecting mirrors 3 and 7 is reduced.

  In addition, when the temperature detected by the temperature detection units 21 and 23 does not fall below a predetermined value only by dimming the first light source 1, the lighting control unit 50 may perform control so that the first light source 1 is turned off. When the projection display device is operating with only the first light source 1 turned on, the second light source 2 is turned on before the first light source 1 is turned off, and the light source is switched in this way to project the projection display device. The heat load on the reflecting mirrors 3 and 7 is eliminated while continuing the operation.

<Effect>
The projection display apparatus according to Embodiment 3 has the following effects. That is, the projection display device dims or turns off the first light source 1 and turns off the first light source 1 when the temperature detection value of the first temperature detection means 21 or the second temperature detection means 23 exceeds a predetermined value. In order to make it light, the lighting control means 50 which makes the 2nd light source 2 light is provided. By controlling the amount of light emitted from the first light source 1 in addition to controlling the air volume of the blower fan 16, it is possible to cool the reflecting mirror while continuing to satisfy the projection function corresponding to a wider range of temperature conditions. .

  1 first light source, 2 second light source, 3 first reflection mirror, 6 glass rod, 7 second reflection mirror, 8 image display element, 9 projection lens, 10 screen, 11 first heat radiation means, 12 second heat radiation means, DESCRIPTION OF SYMBOLS 13 Air path formation body, 16 ventilation fan, 21 1st temperature detection means, 23 2nd temperature detection means, 31 1st lighting drive means, 32 2nd lighting drive means, 41 ventilation control means, 101 relay optical system.

Claims (6)

Light intensity uniformizing means for uniforming the intensity distribution of the incident light beam and emitting it;
A first light source installed outside the incident axis of the light intensity uniformizing means and emitting a first light flux;
A second light source installed on the incident axis of the light intensity uniformizing means and emitting a second light flux;
Bending means for bending the first light flux in a direction of incidence on the light intensity uniformizing means;
Cooling means for cooling the bending means,
The cooling means includes a heat radiating means for radiating heat from the bending means;
Air blowing means for sending cooling air to the heat radiating means;
A projection display device comprising: a blowing control unit that controls the blowing unit. The first light source is installed substantially parallel to the second light source,
The bending means includes a first reflecting mirror that reflects the first light beam emitted from the first light source in the direction of the second light beam;
A second reflecting mirror that reflects the first light flux reflected by the first reflecting mirror in a direction incident on the light intensity uniformizing means;
The heat radiating means includes a first heat radiating means for radiating heat from the first reflecting mirror, and a second heat radiating means for radiating heat from the second reflecting mirror,
The projection display device according to claim 1, further comprising an air path forming body that guides cooling air from the air blowing means to the first heat radiating means and the second heat radiating means. The air blowing control means starts air blowing in response to a user operation,
The first light source is turned on after a predetermined time has elapsed since the start of blowing.
The projection display device according to claim 1, wherein the air blowing control unit stops air blowing after a predetermined period has elapsed since the first light source is turned off. First temperature detecting means for detecting a temperature in the vicinity of the first reflecting mirror;
A second temperature detecting means for detecting a temperature in the vicinity of the second reflecting mirror;
4. The projection according to claim 2, wherein the air blowing control unit controls the air volume of the air blowing unit based on temperature detection values of the first temperature detecting unit and the second temperature detecting unit. 5. Type display device.   The air blowing control means stops air blowing when the temperature detection values of the first temperature detecting means and the second temperature detecting means become a predetermined value or less after the first light source is turned off. The projection display device according to claim 4.   When the temperature detection value of the first temperature detection means or the second temperature detection means exceeds a predetermined value, the first light source is dimmed or turned off, and when the first light source is turned off, the second light source is turned on. The projection display device according to claim 4, further comprising a lighting control unit that causes the lighting control unit to operate.

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