JPH024101B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to compact fluorescent lights.

Recently, new products such as wristwatch-type televisions and pocket televisions have been developed, but the screens of these televisions are made of liquid crystal elements. In the case of pocket televisions, electroluminescence is used as a backlight to illuminate the liquid crystal element. This electroluminescence
It has the advantage of being thin and low power consumption, but on the other hand,
There is a problem that the brightness is not sufficient and the screen is therefore dark.

For this reason, it has been proposed to use a compact fluorescent light as the backlight. In the current state of development of LCD color TVs, 2- to 3-inch models are the mainstream, and because they use batteries, small models with a total lamp length of 120 mm or less and power consumption of 1.5 W or less are required. . However, if a fluorescent lamp is made small like this, the luminous efficiency will be low and it will not be possible to obtain sufficient brightness.On the other hand, if you try to obtain a sufficiently bright light by increasing the luminous efficiency, the power consumption will be large. It has the disadvantage of getting used to it. In particular, if the electrode is a cold cathode type, the life of the electrode will be longer, but the luminous efficiency will be significantly lowered, and such a compact fluorescent lamp has not hitherto been able to provide a high luminous efficiency.

The present invention was made based on the above-mentioned circumstances, and an object of the present invention is to provide a fluorescent light that is small in size, has low power consumption, and can provide sufficient brightness. This is a fluorescent lamp with a total lamp length of 120 mm or less, power consumption of 1.5 W or less, and the electrodes are of the thermionic emission type. Furthermore, if the gas selected from argon, krypton, or neon is filled at a pressure of 6 to 50 Torr, and the amount of mercury sealed is 1 to 2 mg, a life of more than 2000 hours can be expected. Furthermore, in the case of a color display liquid crystal, light can be efficiently utilized by applying a three-wavelength phosphor to the inner surface of the glass enclosure in accordance with the transmittance ratio of each color filter.

The present invention will be specifically described below based on embodiments shown in the drawings.

The drawing is an explanatory cross-sectional view showing an example of the fluorescent light according to the present invention, and the glass enclosure 1 has a total length L of 120 mm.
Hereinafter, a small type with an inner diameter D of 8 mm or less,
A phosphor 4 is coated on the inner wall surface. If this phosphor 4 is a three-wavelength type phosphor with a large output of three primary colors with center wavelengths of approximately 440 nm, 550 nm, and 610 nm, the light utilization efficiency can be improved when used as a backlight for a color liquid crystal element. Can be done.

The filament 2 constituting the electrode is made of a high melting point metal such as tungsten or molybdenum, and functions as a hot cathode that emits thermoelectrons. They are fixed near both ends. The filament 2 may be in the form of a single or double coil or in a straight line, but in any case it is lightweight, for example, the weight of the portion to which the electron emitter is fixed is about 0.3 to 3.0 mg. This is because even if the power consumption is reduced by reducing the weight, the heat capacity becomes smaller, which makes it easier to raise the temperature and improves lighting performance. As the material for the electron emitter, oxides or carbonates of alkali metals or alkaline earth metals, and various other materials are used.

A trace amount of mercury, for example, about 1 to 2 mg, is sealed in the glass enclosure 1, and a gas selected from argon, krypton, or neon, or a mixture thereof, with a concentration of 6 to 50 Torr, preferably 9 to 30 Torr, is sealed. is included. By the way, power consumption
In conventional fluorescent lights of 4W to 40W, the pressure of the rare gas sealed is about several torr, but this value can be reduced by the power consumption.
If applied to a small fluorescent lamp with a power of 1.5 W or less and an inner diameter D of 8 mm or less, the luminous efficiency would drop significantly, but by setting it within the above range, the luminous efficiency can be improved. and power consumption
Operates at less than 1.5W.

Next, an example of an actually produced fluorescent light will be shown.

Total length L 80mm Inner diameter D 6.45mm Arc length 59mm Filled gas Argon filled gas pressure 15 torr Mercury amount 1mg Filament Tungsten (MG=2.67) Electronic emitter Triple carbonate and zircon mixture Voltage, current 45V, 15mA Power consumption 0.67W This small fluorescent light When the light was turned on and the brightness was measured, the brightness was as high as approximately 7000 nt at an ambient temperature of 20°C, and the brightness was sufficient for practical use even after 2000 hours of continuous lighting.

In short, because the electrode is of the thermionic emission type, the luminous efficiency does not decrease much even though it is a small fluorescent lamp, and together with the appropriate amount of mercury and the pressure of the filled gas, it is possible to obtain sufficient brightness. This makes it possible to ensure safety. Therefore, when used as a backlight for a liquid crystal element, the screen can be made sufficiently bright, which is a great practical advantage.

As explained above, the compact fluorescent light of the present invention is
The lamp is a fluorescent lamp with a total length of 120 mm or less and a power consumption of 1.5 W, and the electrode is of the thermionic emission type. It is possible to provide a compact fluorescent light that can provide a high level of brightness.

[Brief explanation of drawings]

The drawing is an explanatory sectional view showing an example of a compact fluorescent light according to the present invention. 1...Glass enclosure, 2...Filament, 3...
...Lead wire, 4...fluorescent material.

[Claims]

1. A connecting conductor 2 and a wound electrode plate group 1 are prepared, the connecting conductor 2 is disk-shaped, and a plurality of protrusions 4 are formed radially from the center to the outer periphery, and the protrusions 4 has a protrusion tip angle of 90° or less, the wound electrode plate group 1 is formed by exposing the wound end surface of the core material 5, and then the tip of the protrusion 4 is attached to the exposed core material 5.
A method for manufacturing a storage battery, characterized in that the two parts 5 and 4 are connected by contacting the protrusion part 4 at a plurality of points and irradiating the inner tip end part of the protrusion part 4 with a laser beam or an electron beam.