JPH04114192A - Lamp cooling device - Google Patents

Abstract

PURPOSE:To improve the effect of cooling a high-brightness light source by preventing air heated in a heat sink from flowing into the side of the high- brightness light source by the convectional phenomenon by use of a partition board. CONSTITUTION:The inside part of a house 1 is partitioned into the rooms on the front and back sides of a cold mirror 3 by use of the cold mirror 3 and the partition board 10 so that the sir heated in the heat sink 13 may not flow into the room 11a on the side of a xenon lamp 2 by the convectional phenomenon. Then, the effect of cooling the xenon lamp 2 can be enhanced and the temperature rising in the lamp house 1 can be reduced to a prescribed value, and the performance of the xenon lamp 2 can be stably achieved. Thus, the effect of cooling the high-brightness light source can be improved, the performance of the high-brightness light source can be stabilized and the life of the high-brightness light source can be prolonged.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a lamp cooling device, and particularly to a lamp cooling device, and particularly to a film, a photographic film, an oil film light valve, a liquid crystal light valve, etc. (hereinafter collectively referred to as carrier). The present invention relates to a lamp cooling device that is suitable for application to a high-intensity light source used in a display device that forms information such as an image, and enlarges and projects this information, as well as an over-the-top projector device.

[Prior Art] A display array device and an overhead glodictor device illuminate a carrier on which information such as an image is formed with a high-intensity light source, and project the transmitted light or reflected light onto a screen in an enlarged manner. It has excellent features such as high brightness and high resolution, can be projected in a bright room, and can be displayed in real time. A xenon lamp is usually used as a high-intensity light source for this type of device. A xenon lamp is filled with xenon gas, has a continuous spectrum similar to daytime sunlight from ultraviolet rays to infrared rays, and has excellent color rendering properties. However, its performance cannot be fully demonstrated unless various conditions are met, and one of those conditions is temperature. That is,
When using a xenon lamp, if the temperature of the caps installed at both ends of the glass tube is not lower than 2°C, there is a risk of gas leakage at the glass and metal sealing parts, and if the gas temperature at the arc part is too high. If the temperature rises, gas convection will occur, causing the arc to float and touch the glass tube, potentially causing an explosion.

Therefore, cooling the xenon lamp is an important issue in this type of device, and various cooling devices have been proposed in the past. Fig. 2 shows a conventional example of such a cooling device. To briefly explain this, 1 is a lamp house of a display device, and inside this lamp house 1, a xenon lamp 2 and a cold mirror 3 are arranged along the optical axis. An axial flow fan 4 for discharging hot air located behind the xenon lamp 2, a reflector 5 surrounding the xenon lamp 2, and a cold mirror 3 located below the A blower 6 is provided to supply the inside of the house 1. The inner surface of the reflector 5 forms an elliptical reflective surface, and its first focal point P1
The xenon lamps 2 are arranged with their centers coincident with each other.

The reflected light emitted from the xenon lamp 2 and reflected by the reflector 5 hits the cold mirror 3 and is reflected.
A carrier (not shown) is irradiated and the image is enlarged and projected onto a screen. In this case, the cold mirror 3 is the xenon lamp 3
It reflects only the visible light 7a of the light source light from the
b is transmitted through the carrier, and the light from which infrared rays have been removed is projected onto the carrier.

The xenon lamp 2 is cooled by a cold air flow from the outside sent in by a blower 6, and the heat of the xenon lamp 2 passes through a hole 8 formed at the rear top of the reflector 5 and is discharged into the lamp house 1 by a hot air exhaust fan 4. is discharged to the outside.

[Problems to be Solved by the Invention] However, in such a conventional lamp cooling device, the infrared rays 7b transmitted through the cold mirror 3 hit the inner wall surface IA of the lamp house behind the cold mirror 3, increasing the temperature of this portion. There is a problem in that heat flows around to the front side of the cold mirror 3 by convection and warms the cooling air supplied from the outside by the blower 6, thereby reducing the cooling effect of the blower 6 on the xenon lamp 2.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and its purpose is to prevent the heat of the portion irradiated by the infrared rays transmitted through the cold mirror from convecting in front of the cold mirror. An object of the present invention is to provide a lamp cooling device that improves the cooling effect for a high-intensity light source.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a lamp cooling device for a display device that irradiates information formed on a carrier with a high-intensity light source and projects the information in an enlarged manner. A hot air exhaust fan is installed behind a reflector that surrounds the high-intensity light source, a heat sink is placed behind a cold mirror placed in front of the high-intensity light source, and a ducted blower that guides external air to the high-intensity light source is connected to the cold mirror. A cooling fan is provided adjacent to the mirror, and a cooling fan is provided corresponding to the heat sink, and a partition plate is provided to block air convection between the heat sink and the high-intensity light source.

[Function] In the present invention, the partition plate blocks air convection between the heat sink and the high-intensity light source. The high intensity light source is cooled by a cool air stream from a ducted blower. The hot air exhaust fan exhausts the heat from the high-intensity light source to the outside of the device. A cooling fan cools the heat sink.

[Example] Hereinafter, the present invention will be described in detail based on an example shown in the drawings.

FIG. 1 is a sectional view showing an embodiment of a lamp cooling device according to the present invention. In the figure, parts that are the same as those of the conventional device shown in FIG. 2 are designated by the same reference numerals, and their explanations will be omitted. In the figure, the inside of the lamp house 1 is divided into a cold mirror 3 and a partition plate 10.
It is partitioned into chambers 11a and llb on the front side and the rear side. A xenon lamp 2, a hot air exhaust fan 4, and a reflector 5 are disposed in the front chamber 11a, and the chamber 11b is further divided into the front and rear by the reflector 5 and a holding member 12 that holds the front opening thereof. Although divided into two chambers, these chambers communicate with each other through a hole 8 formed at the rear top of the flutter 5.

The rear chamber 11b is provided with a heat sink 13 located behind the cold mirror 3, a fan 14 for cooling the heat sink 13, an exhaust port 15 for discharging heat from the heat sink 13 to the outside, and a duct 16 for the blower 6. ing.

The blower 6 is located close to the cold mirror 3 in the front side chamber 1.
The xenon lamp 2 is disposed inside the lamp 1a so as to face the xenon lamp 2.

One end opening of the duct 16 is connected to an air intake port 17 provided on the wall of the rear chamber 11b.

In such a configuration, the fan 4.14 and the blower 6 are turned on and rotated at the same time as the xenon lamp 2 starts emitting light. Due to the rotation of blower 6, duct 1
The cool air flow taken in from the outside through 6 directly cools the xenon lamp 2 and is exhausted to the outside of the lamp house I through the hole 8 of the reflector 5 by the exhaust fan 4.

The cold air flow from the outside sent into the rear side chamber 11b by the cooling fan 14 cools the heat sink 13 heated by the infrared rays of the xenon lamp 2, and is then discharged to the outside of the house through the exhaust port 15.

Here, in the present invention, the inside of the house is partitioned by the cold mirror 3 and the partition plate 10 into chambers on the front side and the rear side of the cold mirror 3, and the air warmed by the heat sink 13 is transferred to the chamber on the xenon lamp 2 side by convection.
Since it is prevented from flowing into the inside of the lamp house 1a, the cooling effect of the xenon lamp 2 is high, and the temperature rise inside the lamp house 1 can be lowered to a specified value, and the performance of the xenon lamp 2 can be stably demonstrated. .

Incidentally, when the cathode base temperature of the xenon lamp 2 was measured, it was 260 degrees C or more in the conventional device, but it was 160 degrees C or less in the present device.

[Effects of the Invention] As explained above, the lamp cooling device according to the present invention is configured such that the partition plate prevents the air warmed by the heat sink from flowing into the high-intensity light source side due to convection. The cooling effect of the light source can be improved, the performance of the high-intensity light source can be stably exhibited, and the life of the high-intensity light source can be extended.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of a lamp cooling device according to the present invention, and FIG. 2 is a sectional view showing a conventional example of a lamp cooling device. 1...Lamp house, 2...Xenon lamp, 3.
...Cold mirror, 4...Hot air exhaust fan, 5.
... Reflector, 6... Blower, 8... Hole, 10.
... Partition plate, 12 ... Holding member, 13 ... Heat sink, 14 ... Cooling fan, 15 ... Exhaust port, 16
...Duct, 17...Air intake. District 1, Figure 2

Claims (1)

[Claims] In a lamp cooling device for a display device that irradiates and magnifies information formed on a carrier using a high-intensity light source, a fan for discharging hot air is provided behind a reflector that surrounds the high-intensity light source; a heat sink is disposed behind a cold mirror disposed in the cold mirror, a blower with a duct for guiding external air to the high-intensity light source is disposed adjacent to the cold mirror, a cooling fan is disposed corresponding to the heat sink, and the A lamp cooling device comprising a heat sink and a partition plate that blocks air convection caused by the high-intensity light source.