JPS60133697A - Method of firing discharge lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lighting a discharge lamp using low-pressure mercury vapor as a light source. More specifically, the present invention relates to a method of stabilizing the intensity of light emitted from a discharge lamp by providing a portion of the surface of the discharge lamp with a portion having a temperature lower than the surrounding temperature.

Examples of discharge lamps that utilize low-pressure mercury vapor include low-pressure mercury lamps and so-called fluorescent discharge lamps (fluorescent lamps) in which a phosphor is attached to the tube wall of the low-pressure mercury lamp. The former is widely used for chemical reactions and sterilization as a light source that emits high-energy ultraviolet rays of 2537A0. on the other hand,
The latter is widely used for household lighting. However, both have the disadvantage that the intensity of light emitted from the discharge lamp is highly susceptible to the influence of ambient temperature. [Lighting Data 17] by Ohmsha (published in 1950)
According to page 21124, the light intensity of discharge lamps that use low-pressure mercury vapor is easily affected by seasonal changes, differences in temperature and temperature, wind, etc., and that these effects should be taken into consideration when using them. The relationship between ambient temperature and its strength is shown in the range of 0 to 60°C.

The inventor uses a low-pressure mercury lamp, which is a useful light source for photochemical reactions, as a light source for reactions at high temperatures, so in order to investigate whether or not it can be used, the inventor placed the low-pressure mercury lamp in a heater to determine the temperature and intensity of ultraviolet rays. When we measured the relationship between The discharge lamp has started blinking or has stopped discharging. As a result, it was found that low-pressure mercury lamps have very poor luminous efficiency at high temperatures, and even do not emit light at all. On the other hand, it was found that fluorescent lamps, which are widely used for lighting in daily life, exhibit temperature dependence similar to low-pressure mercury lamps, and do not discharge stably at temperatures above 100-100 degrees Celsius. Therefore, although both low-pressure mercury lamps and fluorescent lamps are very useful light sources, especially when used at high temperatures, discharge lamps should be installed away from high-temperature areas, and transparent lamps should be placed between them. Due to the need for measures such as interposing a shield, use in high-temperature areas was restricted. In view of the above, the present inventors have devised a method for easily using a discharge lamp that uses low-pressure mercury vapor at high temperatures. After considering various methods, I was able to achieve my goal in a very simple way.
The present invention has now been completed. That is, according to the present invention,
A method for lighting a discharge lamp is provided, which uses low-pressure mercury vapor and makes the temperature of a part of the surface of the discharge lamp lower than the temperature of the surrounding area with which the discharge lamp comes in contact. The present invention will be explained in detail below.

The discharge lamp referred to in the present invention is made of translucent glass or quartz as a main component, and is coated with a silicon tip that emits light using mercury vapor or ultraviolet rays if necessary.
It is a device that is filled with mercury vapor or several Q of mercury droplets and a trace amount of gas such as argon to facilitate discharge, and is equipped with two electrodes for discharge. To give a specific example, low-pressure mercury lamps are AH-15, 30, 60 (Toshiba Electric
), etc., or fluorescent lamps are usually commercially available for home lighting.

Discharge lamps are generally connected to a circuit consisting of a glow starter and a ballast to supply current for discharge. However, as mentioned above, such discharge lamps have 7
At high temperatures of 0 to 80'C or higher, the intensity of the light emitted is greatly reduced, and in some cases, the discharge stops, making it impossible for the discharge lamp to fully demonstrate its original capabilities. Therefore, under such temperatures, a method according to the present invention in which a portion of the discharge lamp is provided with a portion whose temperature is lower than the temperature with which the discharge lamp contacts is preferably used.

As a specific method of the present invention, for example, (1) a flexible tube through which a refrigerant for cooling is passed is attached to a part of the surface of the discharge lamp.

(2) Take one end of the discharge lamp out of the heating section and cool it with room temperature air or air forced by a fan or the like. The following methods are preferably used.

Other cooling means such as electronic cooling elements can also be used in other parts of the discharge lamp without any limitation in the present invention.

The area that the cooling part occupies on the surface of the discharge lamp is generally not strictly determined depending on the discharge etc., but it is usually 1 to 10G of the wall that the light emitting part or mercury vapor comes into contact with! A certain degree is sufficient, and depending on the situation, cooling portions may be provided in several locations.

The method of the present invention is suitably used when a discharge lamp is used under heating. For example, particularly suitable usage examples include illuminating the inside of a heater at a temperature of about 100 to 200° C., or performing a photochemical reaction using a discharge lamp at high temperatures.

EXAMPLES In order to specifically explain the present invention, Examples will be described below, but the present invention is not limited to these examples.

Below is a blank Example-1 Low-pressure mercury lamp GI, -15 (manufactured by Toshiba Electric) of about 40 yen
was connected to a circuit consisting of a ballast FB0 15136B (manufactured by Toshiba Electric) and a glow starter FG-'1P using a Teflon-coated cord. On the other hand, in order to provide a low-temperature area on the lamp surface, a coiled cooling tube was attached, which was a copper pipe with an outer diameter of 8 mm and an inner diameter of 6 mm, wrapped once around the circumference of the lamp. A Teflon tube was connected to the flexible pipe, and a temperature-controlled refrigerant (DyFloil #1, manufactured by Daikin Industries, Ltd.) was circulated using a pump.

Next, a low-pressure mercury lamp was heated using a heater (Yamato Scientific Co., Ltd. D).
The intensity of the ultraviolet rays emitted from the low-pressure mercury lamp was measured by changing the temperature of the heater and the temperature of the refrigerant in the coil tube.
United States Ultra-Violetpproducts
(manufactured by). As a result, the temperature of the refrigerant was increased to 40
It was found that even if the temperature of the heater was increased from 40°C to 190°C, the intensity of the ultraviolet rays decreased by only a few percent, indicating that stable lighting could be achieved even at such temperatures.

On the other hand, for comparison purposes, the same measurement was performed except that the flexible tube was removed, and as the temperature was increased, the intensity of the ultraviolet rays rapidly decreased, and the discharge finally stopped when the temperature reached 160°C.

Example-2 A low-pressure mercury lamp was replaced with a fluorescent lamp (FL2Q se manufactured by Toshiba Electric).
w/18) A lighting test was conducted using the same device as in Example 1, except that K was changed. Set the temperature of the heater to 170
℃ and circulated a 50℃ refrigerant through the coiled pipe, the fluorescent lamp lit up stably, but when I stopped the circulation, removed the coiled tube and performed the same test, the fluorescent lamp blinked and the lamp turned on steadily. could not emit light.

Example-3 A hole with a diameter of 3 cwi was made in the side wall of the heater of Example-1,
5α from one end of the low pressure mercury rung used in Example-1
I left it in the heater.

The gap between the hole and the lamp was filled with asbestos to secure the lamp. Furthermore, a Teflon-coated cord was connected to allow discharge current to flow, and a lighting test was performed. Set the temperature of the heater to 180
℃, when I turned on the lamp while blowing air with a fan to keep the part of the lamp outside the heater at 40℃,
I was able to turn on the light stably.

patent applicant Tokuyama Sotatsu Co., Ltd.

Claims (1)

[Scope of Claims] 1. A method for lighting a discharge lamp, characterized in that when the discharge lamp is used at a high temperature, a portion of the surface of the discharge lamp is brought to a temperature lower than the surrounding temperature. 2. The method according to claim 1, wherein the discharge lamp is used at a temperature of 80° C. or higher. F. The method according to claim 1 or 2, wherein a part of the surface of the discharge lamp is cooled to a temperature of 80° C. or lower. 4. The method according to claim 1, wherein the part of the surface of the discharge lamp is one end of the discharge lamp.