JPS60136149A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To reduce a drop in the photooutput under high peripheral temperature while improving starting under low peripheral temperature by providing amalgam mercury in a crooked inner tube not adjacent to an electrode while sealing a very small amount of mercury vapor into an outer tube. CONSTITUTION:For instance, in addition to setting up amalgam mercury at the base of the columnar part of a central U-shaped inner tube 3, almost vapory mercury is sealed inside the tube. A very small amount of mecury initially sealed in and the mercury vaporized from amalgam mercury do not get back to amalgam so that a very small amount of mercury is successively filled up inside the tube thus removing instability characteristic to the initial stage of lighting. Further, even when a temperature around a lamp is high, a drop in the photooutput at the time of a high surrounding temperature can be checked, if the total amount of mercury grains at the initial sealing-in time together with the mercury vaporizing from the amalgam mercury is made not to exceed 10mTorr.

Description

Detailed Description of the Invention (Technical Field) The present invention provides a compact fluorescent lamp l which houses an inner tube in a discharge space formed by an outer tube and a stem, and uses the inner tube as a discharge path. Open up.

(Background Art) The first case shows an example of a conventional yuzu fluorescent lamp, in which a U
A plurality of bent inner tubes 3 each having a columnar portion and a bent portion are arranged in series with a spacer 4 interposed therebetween, and at least one of the communication portions (not shown) of the bent inner tubes 3 is connected to the above-mentioned one. A pair of electrodes 5.5 are provided at both ends of the inner tubes arranged in series, which are open to the airtight space, and the inner tubes are used as discharge paths. In addition, in the figure, 6 is a lighting device section with a built-in ballast, etc., and 7 is a screw Ij firefly.

In the lamps in this building, the elegance space surrounded by the outer tube and the discharge path are in the same space, so the regulation of water and steam inside the tube is controlled by the outer tube, and the temperature of the coldest part is lowered, making it more compact. This is what makes the world a reality. Figure 2 shows the relationship between the light output and the ambient temperature of the lamp.As is clear from the figure, the maximum light output is achieved when the ambient temperature is around 25°C.
When the ambient temperature rises to around 50° C., the optical output decreases to about 70%.

This Yuzu lance is intended to be a miniaturized fluorescent lamp to replace an incandescent light bulb, and of course, when used, it is attached to each Ume incandescent light fixture. However, if the lamp is used in a nearly hermetically sealed condition, such as a downlight or an enclosed ceiling light, the ambient temperature of the lamp can easily exceed 50"C, resulting in a reduction in light output. It will be used in this condition.

As a conventional technique for regulating the water and silver vapor pressure in the tube at low temperatures, there is a technique using amalgam mercury. For example, this amalgamates mercury with indium, etc., suppresses the amount of evaporation of mercury inside the tube, and makes the evaporation of mercury at high ambient temperatures lower than that of metallic mercury (4J4. i) This prevents a decrease in light output. However, this technology also has drawbacks, such as poor starting performance of the lamp under low ambient conditions of 6"11°C, and poor performance during long periods of lighting, especially during the initial 500 hours of lighting. is either characteristic or unstable.

(Object of the Invention) The present invention has been made in view of the above-mentioned points, and its object is to prevent the optical output from decreasing even at ambient temperature.
Furthermore, starting performance does not deteriorate even under low ambient temperatures.
The object of the present invention is to provide a compact fluorescent lamp with good initial lighting characteristics.

DISCLOSURE OF THE INVENTION As previously mentioned, lamps containing amalgam mercury have improved high ambient temperature characteristics. Here, we will discuss a method to eliminate the drawbacks of lamps filled with amalgam mercury.

The starting performance of amalgam mercury filled lamps is not good.
This is because the intramedullary mercury vapor pressure is low due to amalgam regulations.

In addition, the initial lighting characteristics of amalgam mercury-filled lamps are not good because the mercury evaporated from the amalgam does not return to the amalgam, but adheres to the phosphor, tube wall, etc., and the mercury attitude in the amalgam decreases. It is for this purpose. However, this phenomenon is saturated after about 500 hours of initial lighting, and the characteristics become stable thereafter.

Then, at the base of the columnar part of the U-shaped inner tube 3 shown in FIG. Install ~0.2 indium-mercury amalgam.

When the lamp ambient temperature is at room temperature of 25°C, the inner tube temperature in this area is approximately 100°C. Also, the temperature of the coldest part of the outer tube is 50℃
rank. Therefore, when the lamp is placed in a sealed appliance and the ambient temperature of the lamp reaches approximately 50°C, the temperature of the U-shaped tube column will be approximately 125°C, and the temperature of the coldest part of the outer tube will be 7.
Heat at 5℃. mi of amalgam mercury, that is, the amount of mercury evaporated is 5 m at a temperature of about 125°C at the base of the U-shaped tube column.
The mercury molar fraction was adjusted to 0.1 to 0.
If you set it to 2, even if you turn on the lamp in a dense m-type appliance,
Light output does not decrease.

However, considering low-temperature startup, the ambient temperature of the lamp at the start of startup remains the same as room temperature, even in a closed appliance. Therefore, the temperature of the amalgam mercury is around room temperature, there is almost no mercury vapor inside the tube, and starting is difficult. Therefore, in the present invention, for example, inside the central U-shaped In addition to installing amalgam mercury at the base of the columnar part of the tube 3, mercury at the level of steam rather than mercury particles is sealed inside the tube. By doing so, it is possible to compensate for the lack of mercury vapor at low ambient temperatures and improve startability.

In addition, the finely forged mercury sealed in the initial stage eventually adheres to the tube wall and phosphor and is lost, but the mercury that evaporates from the amalgamated silver does not return to the amalgam, so it is gradually lost within the tube. Umizukai will be replenished. If the lid is set such that the wooden vapor sealed in the "Hatsuru" will be completely consumed in 500 hours, the mercury adhesion to the tube wall and phosphor will be saturated in about 500 hours, so the characteristics at the initial stage of lighting will be The instability can also be eliminated.

Furthermore, even when the ambient temperature of the lamp is high, such as when the lamp is lit in a sealed device, the total amount of mercury that evaporates from the amalgam mercury, in addition to the mercury particles initially filled, is l Qm T If you keep it below 'orr,
It is also possible to prevent a decrease in light output at high ambient temperatures.

(Effects of the Invention) As described above, the present invention provides the following advantages:
A plurality of bent inner tubes each consisting of a columnar portion and a bent portion are configured in series via a spacer, and at least one of the mutual communication portions within the bent portions is open to the airtight space, and the serial configuration is configured as follows. In a fluorescent lamp in which a pair of electrodes are provided at both ends of an inner tube and the inner tube serves as a discharge path, amalgam mercury is placed at the base of the columnar part of the bent inner tube that is not close to the electrodes, and amalgam mercury is placed in the outer tube. By enclosing a small amount of mercury vapor, it is possible to provide a compact fluorescent lamp that has good starting performance at low ambient temperatures, less decrease in light output at high ambient temperatures, and stable initial lighting characteristics.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional example, and FIG. 2 is a characteristic diagram showing the relationship between light output and ambient temperature. Figure 1 3, ° / Figure 2 Procedure Ne City Official Paper (Jimoku City Masaharu) April 6, 1981 1J58 Patent Side No. 250765 2, Title of the Invention (Fluorescent Lamp 3, Amendment) Relationship with the patent applicant's case Patent applicant address 1048 Kadoma, Kadoma City, Osaka Name (5)
83) Matsushita Electric Works Co., Ltd. Representative: Iku Kobayashi 4, Agent Address: 1048-5 Kadoma, Kadoma City, Osaka Prefecture, ? ni
positive object

Claims (1)

[Claims] (1) Inside the outer tube that forms the insufflation space, the columnar part and the bent part ≦
A plurality of bent inner tubes are configured in series via a spacer, and each of the bent inner tubes has a small number of mutually communicating parts (in each case, one place is open to the airtight space, and the inner tubes configured in series are arranged in series). A fluorescent lamp with a pair of electrodes provided at both ends of the tube and the inner tube serving as a discharge path.
A fluorescent lamp as claimed in claim 1 in which the indium mercury amalgam is .about.0.2.