JPH0634139B2 - Lamp cooling system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lamp cooling device, and more particularly to a film, a photographic film, an oil film light valve, a liquid crystal light valve, etc. (hereinafter collectively referred to as a carrier). The present invention relates to a lamp cooling device suitable for application to a high-intensity light source used in a display device and an overhead projector device that form information such as an image and magnify and project this information.

[Prior Art] A display device and an overhead projector device irradiate a carrier on which information such as an image is formed with a high-intensity light source and project its transmitted light or reflected light on a screen in an enlarged manner. It has excellent features such as high resolution, projection in a bright room, and real-time display. A xenon lamp is usually used as a high-intensity light source used in this type of device. The xenon lamp is filled with xenon gas, has a continuous spectrum from ultraviolet rays to infrared rays similar to daytime sunlight, and is very excellent in color rendering. However, the performance cannot be sufficiently exhibited unless various conditions are satisfied. One of the conditions is temperature. That is,
The xenon lamp may cause a gas leak at the sealed portion of the glass and the metal unless the temperature of the bases provided at both ends of the glass tube is 200 ° C. or less, and the gas temperature becomes too high at the arc portion. , Gas convection may occur, causing the arc to float and the arc to touch the glass tube and explode.

Therefore, in this type of device, cooling of the xenon lamp has been an important issue, and various cooling devices have been conventionally proposed. FIG. 2 shows a conventional example of such a cooling device. A brief description thereof will be given. 1 is a lamp house of a display device, and inside the lamp house 1, a xenon lamp 2 and a cold mirror 3 are optical axes. Alongside the xenon lamp 2, a hot-air exhaust axial fan 4 located behind the xenon lamp 2, a reflector 5 surrounding the xenon lamp 2 and a cold mirror 3 are located below the xenon lamp 2 to cool external cold air. A blower 6 is arranged to be supplied into the house 1. The inner surface of the reflector 5 forms an elliptical reflector, and its first focus position P ₁
The xenon lamp 2 is arranged so that the centers thereof coincide with each other. The reflector 5 is emitted from the xenon lamp 2.
The reflected light reflected by the light strikes the cold mirror 3, is reflected, illuminates a carrier (not shown), and is projected on a screen in an enlarged manner. In this case, the cold mirror 3 reflects only the visible light 7a of the light source light from the xenon lamp 3,
The infrared rays 7b are transmitted, and the infrared rays-removed light is projected on the carrier.

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

[Problems to be Solved by the Invention] However, in such a conventional lamp cooling device, the infrared ray 7b that has passed through the cold mirror 3 hits the lamp house inner wall surface 1A behind it and raises the temperature of this portion, The heat circulates to the front surface side of the cold mirror 3 by convection and heats the cooling air supplied from the outside by the blower 6, so that there is a problem that the cooling effect of the xenon lamp 2 by the blower 6 is reduced.

Therefore, the present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to prevent heat of a portion irradiated by infrared rays transmitted through a cold mirror from convection in front of the cold mirror. Another object of the present invention is to provide a lamp cooling device capable of improving the cooling effect for a high-brightness light source.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the present invention provides a cooling device for a lamp of a display device, which irradiates and magnifies and projects information formed on a carrier with a high-intensity light source. A fan for discharging hot air is provided behind a reflector that surrounds the surroundings, a heat sink is arranged behind a cold mirror arranged in front of the high-intensity light source, and external air is thinly added to the high-intensity light source and a blower with a duct is cold. A cooling fan is provided adjacent to the mirror, a cooling fan is provided corresponding to the heat sink, and a partition plate is provided to block convection of air by the heat sink and the high-intensity light source.

[Operation] In the present invention, the partition plate blocks the convection of air by 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 of the high brightness light source to the outside of the device. The cooling fan cools the heat sink.

[Examples] Hereinafter, the present invention will be described in detail based on Examples 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, the same parts as those of the conventional device shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted. In the figure, the inside of the lamp house 1 is made up of a cold mirror 3 and a partition plate 10.
Is partitioned into the front side and the rear side chambers 11a and 11b. A xenon lamp 2, a hot-air discharging fan 4 and a reflector 5 are arranged in the front chamber 11a, and the chamber 11b further includes the reflector 5 and a holding member 12 that holds the front opening thereof. Although divided into two chambers, these chambers are communicated with each other by a hole 8 formed in the rear top portion of the reflector 5.

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 the heat of the heat sink 13 to the outside, and a duct 16 for the blower 6 are provided in the rear chamber 11b. ing.
The blower 6 is close to the cold mirror 3 and the front side chamber 1
It is arranged in the la 1 so as to face the xenon lamp 2. The opening at one end of the duct 16 is the rear side chamber 1
It is connected to an air intake 17 provided on the wall surface of 1b.

In such a configuration, the fans 4, 14 and the blower 6 are turned on at the same time when the xenon lamp 2 starts to emit light, and these are rotated. The cold air flow introduced from the outside through the duct 16 by the rotation of the blower 6 is
The xenon lamp 2 is directly cooled and discharged through the hole 8 of the reflector 5 to the outside of the lamp house 1 by the exhaust fan 4. The cool 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 discharge 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 convected to the chamber 1 on the xenon lamp 2 side.
Since it does not flow into 1a, the cooling effect of the xenon lamp 2 is high, the temperature rise in the lamp house 1 can be reduced to a specified value, and the performance of the xenon lamp 2 can be stably exhibited. .

Incidentally, when the temperature of the cathode base of the xenon lamp 2 was measured, it was 260 ° C. or higher in the conventional device, but 160 ° C. or lower in this device.

As described above, the lamp cooling device according to the present invention is configured so that the partition plate prevents the air heated by the heat sink from flowing into the high-intensity light source side by convection. The cooling effect can be improved, the performance of the high-brightness light source can be stably exhibited, and the life can be extended.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the lamp cooling device according to the present invention, and FIG. 2 is a sectional view showing a conventional example of the 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.

Claims (1)

[Claims] 1. A lamp cooling device for a display device, wherein information formed on a carrier is irradiated by a high-intensity light source and enlarged and projected, wherein a hot-air discharging fan is provided behind a reflector surrounding the high-intensity light source, A heat sink is arranged behind a cold mirror arranged in front of the high-intensity light source, and a blower with a duct for guiding external air to the high-intensity light source is provided adjacent to the cold mirror, and a cooling fan corresponding to the heat sink. And a partition plate for blocking convection of air by the heat sink and the high-intensity light source.