JP2005235721A - Apparatus and method for cooling metal halide lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem of the need for cooling this kind of metal halide lamp up to a fixed temperature, when it is once turned off and turned on again, for example, a metal halide lamp of 30 mm ϕ, which is placed inside a general outer glass tube of 55 mm ϕ, and nitrogen gas is sealed in between the outer tube and the metal halide lamp, where waiting period of almost six and a half minutes is required, before it can be turned on again. <P>SOLUTION: An apparatus comprises an outer glass tube 2, in which a straight-tube long arc type metal halide lamp 1 with an air duct 2a on its outside is mounted to, and a cooling blower fan 3 installed inside one of openings of the outer glass tube. The cooling blower fan is driven, regardless of whether the lamp is in turned-on or turned-off, or driven state during the lamp off period, and stopped during the lamp on period. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a cooling device for a metal halide lamp and a cooling method thereof, and more particularly, to a cooling device for a metal halide lamp and a cooling method thereof for shortening the time for re-lighting the metal halide lamp after turning it off. .

  Conventionally, when this type of metal halide lamp is turned off, it must be cooled to a certain temperature to be turned on again. For example, a metal halide lamp is attached to an outer glass tube having a general outer diameter of 55 mmφ and an inner diameter of 50 mmφ. In the case of a 30 mmφ metal halide lamp which was internally furnished and nitrogen gas was sealed between the outer glass tube and the metal halide lamp, it had to wait for about 6 minutes and 30 seconds until relighting.

  However, there are limited fields where it is necessary to repeatedly turn on and off the metal halide lamp and turn it on again in a short time, and this type of development is delayed.

For this reason, for example, a lamp house has a rod-shaped lamp and a bowl-shaped mirror with an elliptical section in the lamp house, and sends air for cooling the lamp to the mirror. Air holes are provided, and air sent from the fan is sent from the air holes through the duct wind tunnel, and an opening for sending cooling air is also provided above the tube end of the lamp. An air volume adjusting mechanism for adjusting the air blown to the tube end is provided between the tube ends, and the control means is configured to control the air volume sent from the fan according to the electric input (lamp illuminance) to the lamp, Adjusting the position of the wind shielding plate of the air volume adjusting mechanism, adjusting the cooling air volume sent to the entire lamp and the air volume sent to the tube end (see Patent Document 1), and the change in electric field Change the rotation of the cooling fan By keeping the temperature that greatly affects the determination of the vapor pressure constant, there is no change over time in the lamp voltage and color temperature, and by locally cooling the heat retaining film part, the accumulation of the metal halide liquid phase part is reduced. Also disclosed are those that are fixed to the heat insulating film part and can improve the light emission efficiency (see Patent Document 2).
JP-A-9-147805 JP-A-10-125287

  However, a rod-shaped lamp and a bowl-shaped mirror having an elliptical cross section are housed in the lamp house disclosed above, and the mirror is provided with an air hole for sending air for cooling the lamp, The air sent out from the fan is sent out from the air hole through the duct and the wind tunnel, and an opening for sending cooling air is also provided at the upper part of the tube end of the lamp, and the opening and the tube end of the lamp An air volume adjusting mechanism for adjusting the air blown to the tube end portion is provided between them, and the control means controls the air volume sent from the fan and the air volume adjusting mechanism according to the electric input (lamp illuminance) to the lamp. Adjusting the position of the wind shield and adjusting the amount of cooling air sent to the entire lamp and the amount of air sent to the tube end cools rod-shaped lamps such as metal halide lamps and mercury lamps. But, Not to cool for purposes of lighting, temperature of the lamp each portion obtained by to be held is cooled to optimum temperature, and has a what structures complicated.

  In addition, by changing the rotation of the cooling fan according to the change in the electric field and keeping the temperature that greatly affects the determination of the vapor pressure constant, the lamp voltage and the color temperature do not change over time, and the heat insulation film By locally cooling the part, the pool of the metal halide liquid phase part is fixed to the heat insulating film part, and the light emission efficiency can be improved.There is no change over time in the lamp voltage and color temperature of the metal halide lamp, The purpose is to increase the light collection efficiency, and the purpose is not to relight.

  In view of the above-mentioned problems, the present invention is a result of intensive studies. The cooling device for a metal halide lamp according to claim 1 is a straight-tube long arc metal halide lamp, in which the metal halide lamp is provided with an air flow passage provided outside. The outer glass tube and a cooling fan provided inside one of the open ends of the outer glass tube are provided.

  Furthermore, the cooling method for the metal halide lamp according to claim 2 is such that the cooling fan for the metal halide lamp according to claim 1 is operated continuously when the metal halide lamp is turned on and off. is there.

  Furthermore, the cooling method for the metal halide lamp according to claim 3 uses the cooling device for the metal halide lamp according to claim 1, and the cooling fan is operated when the metal halide lamp is turned off and stopped when the metal halide lamp is turned on. .

  The metal halide lamp cooling device and the cooling method thereof according to the present invention are such that an air flow passage is provided outside the metal halide lamp and is installed in the outer glass tube, and a cooling blower fan is provided at one open end of the outer glass tube. Therefore, the cooling fan of the cooling method can be operated continuously when the metal halide lamp is turned on or off, or the cooling fan is a metal halide. The lamp is operated when the lamp is extinguished and stopped when the lamp is lit, and it is a revolutionary and extremely practical invention that reliably shortens the relighting time with a simple device.

  The present invention relates to a metal halide lamp cooling device and a cooling method therefor, and more particularly, to a metal halide lamp cooling device and a cooling method therefor that reduce the time required to re-light a metal halide lamp after it is turned off. The cooling device for a metal halide lamp according to claim 1 is a straight tube type long arc metal halide lamp 1, wherein the metal halide lamp 1 is internally provided with an air flow passage 2a provided outside, A cooling blower fan 3 provided inside one open end of the glass tube 2 is provided.

  Furthermore, the cooling method of the metal halide lamp of Claim 2 uses the cooling device of the metal halide lamp of Claim 1, and the said air blower fan is made to operate | move continuously, when the metal halide lamp 1 is lighted and extinguished. is there.

  Furthermore, the cooling method of the metal halide lamp of Claim 3 uses the cooling device of the metal halide lamp of Claim 1, and the said ventilation fan is operate | moved when the metal halide lamp 1 is light-extinguished, and is stopped at the time of lighting.

  The metal halide lamp cooling device and cooling method according to an embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a schematic side view for explaining an overview of the embodiment of the metal halide lamp cooling device according to the present invention. FIG. 2 is a schematic side view for explaining an outline of a general metal halide lamp, and FIG. 3 is a relighting comparing the data of the embodiment of the metal halide lamp cooling device and the cooling method of the present invention. It is a graph showing time, temperature, and a brightness | luminance.

  In other words, the straight tube type long arc metal halide lamp 1 of the cooling device for a metal halide lamp according to the present invention is a well-known one, and as shown in FIG. 1, a transparent quartz arc tube 1a contains a plurality of metals such as mercury gas. Gas is sealed and electrodes 1b are provided at both ends, and external lead wires 1c are extended from the respective electrodes 1b. The external lead wires 1c are connected to a power source (not shown) and are turned on and off. The metal halide lamp 1 used in the example has a quartz arc tube 1a with a diameter of 30 mm, a total length of 360 mm, and a size of 280 mm between each electrode 1b, a lamp current of 14 A, and a lamp voltage of 300 V ± 5. %, With a lamp output of 4 KW.

  The transparent outer glass tube 2 has an outer diameter of 55 mm, an inner diameter of 50 mm, and a length of 600 mm with open ends at both ends. An air flow passage 2 a is provided outside the quartz arc tube 1 a of the metal halide lamp 1. In the embodiment, a 10 mm air flow passage 2a is provided on the entire circumference between the outside of the quartz arc tube 1a and the inside of the outer glass tube 2.

  Next, the cooling blower fan 3 is driven by a motor (not shown) as a driving source, and is provided at one open end of the outer glass tube 2 to drive the cooling blower fan 3. As a result, air passes through the air flow passage 2a and the metal halide lamp 1 is cooled.

  Furthermore, in the embodiment of the metal halide lamp cooling method of the present invention, the cooling device for the metal halide lamp 1 is used, and the cooling blower fan 3 is continuously operated when the metal halide lamp 1 is turned on and off to perform cooling. Is.

  Further, in the following embodiment, the cooling device for the metal halide lamp is used, and the cooling fan 3 is operated when the metal halide lamp 1 is turned off and stopped when the metal halide lamp 1 is turned on.

  Next, the metal halide lamp cooling device and cooling method of the present invention were tested under the same conditions at room temperature of 23 ° C., and the relationship between the relighting time, temperature, and brightness compared with the data of the experimental example was measured at the point of arrow A. The results are shown in FIG.

  As a result, the a line uses the conventional metal halide lamp 1 shown in FIG. 2 which is conventionally used. The metal halide lamp 1 is built in the outer glass tube 2 and the outer glass tube 2 is sealed to form nitrogen. Gas is sealed at 150 Torr, the brightness is about 100% in 2 minutes after lighting, and the measured temperature at measuring point A reaches about 500 ° C. It takes about 6 minutes 30 seconds to reach 140 ° C.

  Furthermore, line b is an experiment conducted in the atmosphere by mounting a metal halide lamp 1 in an outer glass tube 2 having open ends at both ends, and although the brightness drops by about 1% to 2%, air naturally It takes about 4 minutes and 30 seconds to reach the relighting temperature of about 140 ° C. after being circulated and cooled.

  The c-line is an experiment in which the cooling device for the metal halide lamp according to the present invention is used and the cooling fan 3 is always in a movable state and the condition of the blowing amount is changed, that is, a motor for driving the cooling fan 3. However, the luminance is almost unchanged until the light is turned on and becomes stable lighting, and the luminance is reduced by about 3%, but there is no practical problem.

  The c-1 line has a driving motor voltage of 12 V, a current of 0.1 A, and an output of 1.2 W. In this case, the relighting temperature of 140 ° C. is 2 minutes and 40 seconds. It takes time, and the c-2 wire has a motor voltage of 12V, a current of 0.2A, and an output of 2.4W. In this case, it takes 1 minute 50 seconds to reach a relighting temperature of 140 ° C. It takes time, and the c-3 wire has a motor voltage of 12V, a current of 0.3A, and an output of 3.6W. In this case, the re-lighting temperature of 140 ° C is 1 minute 30 seconds. It took time.

  In the above experiment, the cooling fan 3 was operated continuously when the metal halide lamp 1 was turned on and off. However, when the lighting fan was turned on, the cooling fan 3 was stopped. As a result, it turned out that there is no big difference.

  The metal halide lamp cooling apparatus and cooling method of the present invention improve work efficiency by greatly reducing the time of relighting in the field where the metal halide lamp is repeatedly turned on and off in a short time.

  FIG. 1 is a schematic side view for explaining an outline of an embodiment of a cooling device for a metal halide lamp according to the present invention.   FIG. 2 is a schematic side view for explaining an outline of a conventional metal halide lamp,   FIG. 3 is a graph showing the relighting time and temperature comparing the data of the metal halide lamp cooling device and the cooling method according to the embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Metal halide lamp 1a Quartz arc tube 1b Electrode 1c External lead wire 2 Outer glass tube 2a Air flow path 3 Cooling fan

Claims (3)

  In the straight tube type long arc metal halide lamp, the metal halide lamp is provided with an outer glass tube in which an air flow passage is provided on the outside, and a cooling blower fan installed at one open end of the outer glass tube. A cooling device for a metal halide lamp.   The method of cooling a metal halide lamp according to claim 1, wherein the cooling fan is continuously operated when the metal halide lamp is turned on and off.   The cooling method for a metal halide lamp according to claim 1, wherein the cooling fan is operated when the metal halide lamp is turned off and stopped when the metal halide lamp is turned on.

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