JPH0448629Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fluorescent lamp, and more particularly to a compact fluorescent lamp with a total lamp length of 300 mm or less and a power consumption of 10 W or less.

[Prior art and its problems]

Recently, new products such as wall-mounted televisions and pocket televisions have been developed, but the screens of these televisions are formed of liquid crystal elements. It has been proposed to use a small fluorescent lamp as this backlight. In the current state of development of LCD color TVs, 2- to 3-inch models are the mainstream, and recently 12
It has been developed to about an inch. These televisions have a particular need for power savings. Furthermore, there is a demand for improvement in the temperature dependence of luminous efficiency and miniaturization of light sources. However, in conventional lamps, the tube diameter is 7 mm.
Therefore, the above request cannot be answered.
This is because the tube diameter is relatively large, so unless the lamp current is increased, the luminous efficiency at low temperatures will be drastically reduced. Therefore, it is not possible to save power.

Incidentally, in fluorescent lamps, a material called a getter to which mercury is attached is often placed behind the electrode in order to seal mercury inside the tube or to absorb generated impurity gas. Therefore, a space is required for this purpose, and as the electrode position approaches the center, the arc length becomes shorter. For fluorescent lamps with a lamp length of 400 mm or more, this degree of shortening of the arc length is not a problem, but for small fluorescent lamps with a total length of 300 mm or less, the ratio of the arc length to the lamp length becomes small, resulting in a shortened emission length.

In addition, the length of the filament electrode is approximately 3 mm at the shortest, and a mounting part of approximately 1 mm is required at each end. It becomes impossible to install perpendicular to the axis.

[Purpose of invention]

Therefore, the object of the present invention is to provide a compact fluorescent lamp that can ensure a long arc length, has good luminous efficiency, and can be used in thin tubes with an inner diameter of 4 mm or less.

[Structure of the idea]

The configuration of this invention is such that the total length of the lamp is 300 mm or less.
A fluorescent lamp with a power consumption of 10W or less, in which a getter with plate-shaped mercury attached is attached to the internal lead wire of at least one end of a glass arc tube, and the getter with mercury attached and the filament electrode each serve as the arc tube. It is characterized in that it is arranged parallel to the axis of the and so that the two face each other.

〔Example〕

In Fig. 1, the glass arc tube 1 has a total length L.
It is a small device with an inner diameter D of 4 mm or less, less than 300 mm, and the inner wall surface is coated with phosphor. Both ends of this arc tube 1 have the same structure, each having two lead wires 2 made of nickel wire, Kovar wire, etc.
is connected to the diamond wire or Kovar wire used for the sealing part and planted, but one lead wire 2 is bent and the filament electrode 3 is connected to the tube axis and the other lead wire 2. held parallel.

The filament electrode 3 is made of a high-melting point metal such as tungsten or molybdenum, and may be in the form of a single or double coil, or a straight line. The weight is approximately 1.0 to 10.0 mg.

This is because the heat capacity decreases due to weight reduction, and even if power consumption is reduced, the temperature rises easily and the lighting performance improves. As the material for the electron emitter, alkali metal or alkaline earth metal oxides or carbonates, and various other materials are used.

The lead wire 2 below the filament electrode 3 has
A getter 4 to which mercury is attached is attached parallel to the filament electrode 3. The getter 4 is plate-shaped, for example, a nickel-plated iron plate to which mercury or a zircon compound is attached, and functions to supply mercury and absorb impure gases.

Inside the glass arc tube 1, a trace amount of mercury, for example, about 1 to 5 mg, is sealed, and a gas selected from argon, krypton, or neon, or a mixture thereof, with a content of about 6 to 50 Torr is sealed. , the power consumption is less than 10W.

Next, an example of an actually manufactured fluorescent lamp will be shown.

Total length L 84mm Inner diameter D 3.4mm Arc length 65mm Filled gas Argon Filled gas pressure 40 torr Mercury content 2mg Filament Tungsten Electronic emitter Triple carbonate and zirconia mixture Getters containing mercury Zr-Al, Ti-Hg Lamp voltage 60V Lamp current 20mA Lamp power 1.2 W The temperature of the filament electrode 3 that energizes this small fluorescent lamp rises, and the lamp changes from glow discharge to arc discharge to turn on, but the filament electrode 3
Since the getter 4 and the getter 4 are attached parallel to the tube axis facing each other, the arc length can be made longer despite the presence of the getter 4. Therefore, an increase in the arc length corresponds to an increase in the number of positive column parts that emit light effectively, and the light emission efficiency is improved. When the brightness was actually measured, it was as large as approximately 20,000 nt at an ambient temperature of 20°C, and was sufficiently bright for practical use even after 2,000 hours of continuous lighting. From this, when used as a backlight for a liquid crystal element, the screen can be made sufficiently bright, and since it is small and consumes little power,
It has great practical merits.

[Effect of idea]

In the fluorescent lamp of the present invention, a getter in which plate-shaped mercury is attached is attached to the internal lead wire of at least one end of the glass arc tube, and the getter and the filament electrode are each substantially parallel to the axis of the arc tube. Since the two are arranged so as to face each other, the arc length can be increased even though the getter is attached, and the luminous efficiency is improved. Further, even if the inner diameter of the arc tube is as small as 4 mm or less, the electrodes can be attached. Therefore,. According to the present invention, it is possible to provide a fluorescent lamp that is small in size, consumes little power, has a simple structure, has high luminous efficiency, and is also compatible with arc tubes with small inner diameters.

[Brief explanation of the drawing]

FIG. 1 is an explanatory sectional view showing an example of a compact fluorescent lamp according to the present invention, and FIG. 2 is a sectional view taken along the - line in FIG. 1. 1...Glass luminous tube, 2...Lead wire, 3...
Filament electrode, 4...Getter with mercury attached.

Claims (1)

[Scope of utility model registration request] A fluorescent lamp with a total length of 300 mm or less and a power consumption of 10 W or less, in which a getter with plate-shaped mercury attached is attached to the internal lead wire of at least one end of the glass luminous tube. A compact fluorescent lamp characterized in that a filament electrode and a filament electrode are arranged substantially parallel to the axis of an arc tube and facing each other.