JPS5858780B2 - fluorescent lamp - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a fluorescent lamp, and its objects are to improve the low temperature startability of conventional fluorescent lamps, to provide a starting function inside the fluorescent lamp, and to provide a glow starter type lamp. The purpose of the lighting device is to use a fluorescent lamp that starts instantaneously.

FIG. 1 shows a conventional fluorescent lamp, in which the inner surface of a tube 1 is coated with a thin and even phosphor 2.

A stem 3 is sealed at both ends of the tube body 1, and an electrode is formed by coating a filament 5 supported by a filament support 4 with an electron radioactive substance (oxide mainly composed of Ba, Sr, Ca, etc.). Ru.

Both ends of the tubular body 1 are provided with a cap 7 having two connecting pins 6.

In addition, mercury particles and Ne are placed inside the tube 8 after evacuation and vacuum. Ar, Kr
Single or mixed noble gases such as these are sealed.

Now, when the sealed gas is Ar alone and mercury, the mercury vapor pressure inside the tube body 1 is about 2 to 3 torrorr at room temperature, while the Ar pressure is about 2 to 3.

One reason for sealing in Ar gas is to lower the starting voltage of discharge due to the Penning effect.

However, at low temperatures, the discharge starting voltage of the Ar-mercury filled lamp increases as shown in FIG. 2, and the starting performance deteriorates.

This is because when the temperature decreases, the Ar pressure inside the tube remains almost constant, but the mercury vapor pressure decreases, and the number of mercury atoms inside the tube decreases too much. The probability of ionization is significantly reduced, the Penning effect no longer works, and conventional fluorescent lamps can be used at ambient temperatures of 0°C.
If it is below, the starting performance will be extremely poor.

The present invention has been made in view of such circumstances.

The fluorescent lamp of the present invention will be explained below with reference to FIGS. 3 to 6 shown as examples.

FIG. 3 shows an embodiment of the present invention, in which the inner surface of the tube body 9 is coated with a phosphor 10 thinly and evenly.

A stem 11 is sealed to both ends of the tube body 9, and two stems are attached to the outside of the stem 11.
A cap 13 with a real connecting pin 12 is attached.

The stem 11 has a first filament support 14A and a second filament support 14B that are electrically conductive with one of the connection pins 12.
is erected, a first filament 15A is stretched between them, and the first filament N5A is disposed near the stem 11.

The second filament 15B is stretched between the second filament support 14B and the third filament support 14D.

At this time, the second filament 15B is disposed closer to the other electrode than the first filament 15A.

This filament support 14D is supported by a support 14C that stands upright on the stem 14 via an insulator 16 and is electrically conductive to the connection pin 6.

One end of the third filament support 14D is provided as a bimetal contact 17, and by interposing the bimetal contact 17, the filament support 14c and the third filament support 14D are always electrically connected before lighting.

After vacuum evacuation, mercury particles and Ne are placed inside the tube body 9.

Single or mixed rare gases such as Ar and Kr are sealed.

The first and second filaments 15A and 15B formed by the filament supports 14A, 14B and 14D are arranged in the longitudinal direction of the tube, as shown in FIG.
First and second filaments 15A.

It is also possible to arrange the direction of 15B in the same direction as a conventional fluorescent lamp.

In each of the above embodiments, the electrode structure is the tube body 9.
provided at one or both ends of the

Now, if the atmospheric pressure inside the discharge tube is p (Torr) and the distance between the electrodes is d (m), then the starting voltage Vs (V) is D
and d, and Paschen's law expressed as Vs=f(p, d) is applied.

This is illustrated in FIG. 5, where the starting voltage is low in the portion to the right of point A, as shown by curve a, due to the Penning effect at room temperature.

However, at low temperatures, the mercury vapor pressure inside the tube decreases,
Almost only Ar atoms exist in the tube, the Penning effect disappears, and the starting voltage Vs rises in a curved manner.

Therefore, as shown in the figure, in order to lower the starting voltage of the fluorescent lamp at low temperatures, the discharge distance between both electrodes can be shortened.

When the fluorescent lamp according to the present invention is connected as shown in FIG. 6 and the switch Sw is closed, a current flows through the ballast EC from the first filament support 14A to the first filament 15A to the second filament 15A.
It passes through the filament 15B and further passes through the bimetal contact 1γ from the third filament support 14D to the support 14.
C flows through C and preheats the first and second filaments 15A and 15B, thereby emitting thermoelectrons.

The heat generated by the first and second filaments 15A and 15B operates the bimetal contact 17 in the vicinity of the first and second filaments 15A and 15B.
A kick voltage is generated by the ballast C1C as soon as the electric current is separated from 4C, and since the discharging distance is shortened by providing the second filament 15B, it is easy to start even at low temperatures.

Initially, a discharge starts via the tip of the second filament l-15B, which further increases the temperature of the electrode part, so that the bimetallic contact 17 responds.

The second filament support 14B is contacted with the second filament support 14B.

For this purpose, both ends of the second filament 15B are short-circuited,
The discharge moves to the first filament 15A, and the fluorescent lamp operates in a normal lighting state.

At this time, the discharge distance is about the same as that of a conventional fluorescent lamp, and if the distance from the base 13 to the tip of the second filament 15B is about 100 to 150 degrees, the rated power supply voltage can be maintained even at low temperatures of about 0°C to 30°C. The result is easy startup.

As described above, according to the present invention, there is a tube 9 having a phosphor 10 coated on its inner surface and electrodes at both ends, a stem 11 sealed to the open end of the tube 9, and a stem 11 on the outside of the tube 9. A cap 13 is provided with two connecting pins 12 and 12 that protrude from the top and is attached to the outer end of the slam 11. Elongated second filament support 1 erected on 11
4B, a support 14C that stands on the stem 11 and is electrically conductive to the connecting pin 12; a third filament support 14D supported by inserting a bimetal contact 17 into the support 14C; and the first and second filament supports 14A. , 14B, and the second filament support 14B and third filament support 14D.
By making the fluorescent lamp composed of a third filament that is stretched between the first filament 15A and the other electrode of the tube body 9, the third filament is placed between the other electrodes of the tube body 9. By connecting the installed second filament 15B, the distance between the electrodes is shortened, resulting in a fluorescent lamp with good low-temperature starting characteristics.After startup, the distance between the electrodes is long due to the first filament 15A on the stem 11 side. That is, by restoring the length to the same length as a conventional fluorescent lamp, it provides the same lighting characteristics as a conventional lamp, and by providing a starting function consisting of a bimetal contact 17 inside the tube body 9, the glow starter and its socket are improved. It is advantageous in terms of maintenance because it is unnecessary, the external circuit for it is simple, the required materials are reduced, and the glow starter is not required.

Furthermore, since preheating starts instantly when the power switch is turned on, it has the effect of instantaneous start even when attached to a conventional glow starter lighting device.

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 show a conventional example, in which FIG. 1 is a cutaway front view of a fluorescent lamp, and FIG. 2 is a diagram showing the relationship between discharge starting voltage and temperature. 3 to 6 show embodiments of the fluorescent lamp of the present invention, FIG. 3 is a cutaway front view of the fluorescent lamp of one embodiment, and FIG.
The figure is a cutaway front view of a fluorescent lamp of another embodiment, FIG. 5 is a diagram showing the relationship between the distance between electrodes and the discharge starting voltage, and FIG. 6 is a connection diagram. 9... Tube body, 10... Fluorescent body, 11
...Stem, 12...Connection pin, 13
......cap, 14A...first filament support, 14B...second filament support, 14C...support, 14D...・Third
Filament support, 15A...first filament, 15B...second filament, 16...
...Insulator, 17...Bimetal contact.

Claims (1)

[Claims] 1. A tube body with a phosphor coated on the inner surface and electrodes at both ends, a stem sealed to the open end of the tube body, and two connecting pins protruding outward from the tube body, the outer end of the stem A first short filament support that is installed on the stem and conducts electricity to the connecting pin, and a second long filament support that is also installed on the stem.
a filament support, a support that stands on the stem and is electrically conductive to the connection pin; a third filament support that is supported by inserting a bimetal contact into the support; and a third filament support that is stretched between the first and second filament supports. A fluorescent lamp comprising a first filament and a third filament stretched between the second filament support and the third filament support and disposed closer to the other electrode of the tube than the first filament.