JPH01115050A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To extend the usable voltage range of a power source to about half of the rated voltage in battery use and to meet the requirement of 2000hr or more for lighting life by charging gas into a lamp at the pressure of 5-15Torr, in a fluorescent lamp which lights at 100mA or less for lamp current or at 4W or less for lamp power by an electronic lighting circuit which preheats a filament at all times during lighting. CONSTITUTION:This is a fluorescent lamp which lights at 100mA or less for lamp current or 4W or less for lamp power, and is charged in the lamp at the pressure of 5Torr to 15Torr and it is combined with an electronic lighting circuit which preheats a filament at all times. Hereby, life of 200hr or more can be realized at about half the rated voltage of a battery, so the lamp can be used within the wide input voltage. For example, pure argon is used as lamp charging gas, and within the range of 5-15Torr, the requirements of 2000hr or more for life and 4V or less for light starting voltage are met.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluorescent lamp used in a wide voltage range,
In particular, the present invention relates to a structure of a fluorescent lamp suitable for lighting using a battery as a power source.

C. Conventional technology] Conventionally, regarding the pressure of gas filled in a lamp, for example, 1.
In the case of an instant lighting system, such as No. 4-138477, the lifetime was ensured by setting the filled gas pressure in the range of 5 to 15 Torr.

[Problem that the invention seeks to solve]

The above conventional technology does not take into consideration the case where the power supply voltage range is large, such as when a battery is used as the power source.In particular, at a voltage half the rated voltage, the lamp current decreases, so heat from the electrodes during lighting is generated. Not enough electrons can be emitted and the lamp will not light up. However, when lighting a lamp with dry batteries, the lamp current is limited to less than 100 mA or the lamp power is less than 4 W. If the lamp is used under such conditions, it must be preheated at all times during lighting to raise the temperature of the filament and keep the electrodes warm. It is known that unless the thermionic emission from the lamp is improved, continuous lighting will be difficult and the lamp life will be disadvantageous.

The object of the present invention is that the voltage range of the power supply can be used up to about half of the rated voltage when using batteries, and the lighting life is 2000.
The goal is to satisfy more than hr.

[Means for solving problems]

The above purpose is to increase the gas pressure inside the lamp from 5 Torr to 1 Torr.
This is achieved in combination with an electronic lighting circuit that encapsulates the filament in the range of 5 Torr and constantly preheats the filament.

[Effect]

By increasing the lamp filling gas pressure, the lamp life becomes longer, but the lighting start voltage also becomes higher, making it difficult to light the lamp at a low voltage.

When using argon gas (Ar) as the filler gas, if the filler Ar pressure is 15 Torr or less, the lamp can be lit without increasing the starting voltage that much, and in terms of lamp efficiency, the Ar filler pressure cannot be increased that much. cannot,
The limit is 15 Torr. In addition, the enclosed Ar pressure was 5 T.
If it is at least orr, the lighting life can be increased to an average of 2000 hours or more.

〔Example〕

An embodiment of the present invention will be described below.

FIG. 1 shows the appearance of a lamp applied to the present invention.

A bead mount consisting of two lead wires 1 and 2, beads 3, and filament 4 is sealed at both ends of a U-shaped glass tube 5 with a tube diameter of 12 nm, and pure argon gas 6 of 6 to 10 Torr is injected into the lamp. Enclose mercury 7.

FIG. 2 shows a lighting circuit for the lamp shown in FIG. 1, which is a two-stone push-pull system, and an output voltage of 250 V (Ac) is generated at an input voltage of 7.5 V. Also, the filament is constantly preheated during lighting. The lamp current at rated voltage lighting is 50 mA.

Figure 3 shows the relationship between sealed Ar pressure and discharge starting voltage.The sealed Ar pressure that can satisfy the discharge starting voltage of 4V or less is 15To.
rr or less.

Figure 4 shows the relationship between sealed Ar and lamp life when lit at 4V.
The voltage is Torr or more.

Therefore, in this example, pure argon was used as the lamp filling gas, and the lifespan was 2000 hours in the range of 5 to 15 Torr.
satisfies r or more and lighting start voltage 4v or less.

Furthermore, the setting of the inverter is not particularly limited as it is within the scope of the lamp manufacturer's design to variously change the relationship between the battery input voltage and output voltage.

〔Effect of the invention〕

According to the present invention, a life of 2000 hr or more can be achieved with a voltage that is approximately half the rated voltage of the battery, so there is an effect that the lamp can be used in a wide input voltage range.

[Brief explanation of the drawing]

Fig. 1 is an external view of a lamp according to an embodiment of the present invention, Fig. 2 is a lamp lighting circuit diagram, Fig. 3 is a diagram showing the relationship between the lamp filled gas pressure and the discharge starting voltage, and Fig. 4 is the filled gas pressure and lamp life. It is a relationship diagram. 1.2... Lead wire, 3... Bead, 4... Filament, 5... U-shaped glass tube, 6... Ar gas,
7...Mercury.绾－≦Wat or garden

Claims (1)

[Claims] 1. A fluorescent lamp that is lit at a lamp current of 100 mA or less or a lamp power of 4 W or less by means of an electronic lighting circuit that constantly preheats the filament during lighting, characterized by filling the lamp with a gas pressure within the range of 5 to 15 Torr. Fluorescent lamp.