JPS60151948A - Small-size fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a small-size and low power consumption lamp with a sufficient brightness by using a thermionic emission type electrode for a filament electrode in a fluorescent lamp which has a total length of less than 120mm. and has a power consumption of less than 1.5W. CONSTITUTION:A glass enclosure 1, which contains a very small amount of mercury and a gas such as argon, etc. with 6 to 50Torr pressure, is made less than 120mm. in its total length L and less than 8mm. in its inner diameter D, and a 3 wave length (approximately 440nm, 550nm, and 610nm) fluorescent substance 4 with a large output of light is applied on the surface of its inner wall, and a filament 2, whih is made of tungsten and others and functions as a hot cathode to emit thermions, is provided; thus a small-size fluorescent lamp with a power consumption of less than 1.5W is formed which is used as the back light of a liquid crystal element, etc. Therefore, although it is of small size, a sufficient brightness is obtained by using a thermionic emission type electrode for the electrode 2 without reducing the luminous efficacy.

Description

[Detailed description of the invention] TECHNICAL FIELD This invention relates to compact fluorescent lights.

Recently, new products such as wristwatch-type televisions and pocket televisions have been developed, and the screens of these televisions are formed of liquid crystal elements. In the case of pocket televisions, electroluminescence is used as a bank light to illuminate the liquid crystal element. This electroluminescence has the advantage of being thin and having low power consumption.
On the other hand, the brightness is not sufficient, so the screen is rated at 11E.
It has the problem of being small.

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 6 inch models seem to be the mainstream.
On the 6th, which is the first month of battery usage, a small lamp with a total length of 120 mm or less and a power consumption of 1.5 W or less is required. However, if the 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, it will consume 1b , the disadvantage is that the force becomes large.

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 conventionally it has not been possible to obtain a high luminous efficiency with such a small fluorescent lamp. Not yet.

This was done based on the circumstances described above, with the aim of providing a fluorescent lamp that was small in size, had low power consumption, and had sufficient brightness to provide sufficient brightness. Where there should be 0 sentences, ugh :/).

The fluorescent lamp has a total length of 120 mm or less, a power consumption of 1.5 W or less, and the electrodes are of thermionic emission type. Furthermore, if a gas selected from argon, krypton, or neon is filled at a pressure of 6 to 50 Torr, and the amount of mercury is 1 to 2 wrg, 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 five-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. is phosphor 4
is coated. The center wave technique of this fluorescent body 4 is about 440.
If a 6-wavelength type phosphor has a large output of the six primary colors of light of nrn, 550 nm, and 610 nm, the light utilization efficiency can be improved when used in a backlight of a color liquid crystal element.

The filament 2 constituting the electrode is made of a cylindrical melting point metal such as tungsten or molybdenum, and functions as a hot cathode that emits thermoelectrons. Each is fixed nearby. The filament 2 may be in the form of a single or double coil, or in a straight line, or in any case, the weight of the part to which the deuteron emitter is fixed is about 0.5 to 6.0η. There is. This means that even if consumption is reduced slightly due to the shift to lighter weights, Kumagaya still has 1.
This is because the temperature rises easily because the light becomes pregnant, and the lighting performance improves. As the material for the TtL child emitter, oxides or carbonates of alkali metals and alkaline earth metals, and other materials are used6. The mercury of the de is inserted, and the 6
~50 Torr, preferably 9-50 Torr of argon,
A gas selected from Crypto-7 or Neon, or a mixture thereof, is inserted. By the way, in conventional firefly lamps with power consumption of several watts to 200 W, the sealing pressure of the gas is about 1 liter; If a light lamp (kc)@ is used, the luminous efficiency will be significantly reduced, but the luminous efficiency can be improved by setting it within the range described in 1) IJ.

And it is operated at less than 1I3J cost 7++ power or 1,5W.

Next, we will show an example of a fluorescent light that was actually produced.

Total length, L 80 mm Inner diameter D 6.45 m Arc length 70 m Enclosed gas Argon filled gas pressure 15 torr Mercury amount, filament Tungsten (MG = 2.67) frost, child emitter Triple carbide and zircon mixture 9
Load pressure, current: 45 V, 15 mA, power consumption: 0.67 W When I turned on this small fluorescent lamp and added d111 to the square footage, I found that the ambient temperature was 20°C, and was as large as approximately 700υnt, and it lasted for 2000 hours continuously. Even after the lights were turned on, there was sufficient brightness for practical use.

In short, because the electrode is a heat/acid emission type, the luminous efficiency is 1, which does not decrease even though it is a small fluorescent lamp, and the mercury side and the gas pressure are set to appropriate values. Love 1
This makes it possible to ensure sufficient brightness. From this, 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 lamp of the present invention has a fluorescent lamp Jσ with a lamp total length of 100 mr+ or less, a power consumption of 1b1 of 1.5W, and a heat 1h electron emitting type at the poles. Therefore, according to the present invention, it is possible to provide a small-sized electric light that is small in size, consumes little power, and can provide sufficient brightness.

[Brief explanation of drawings]

Figure a'ii is an explanatory sectional view showing an example of a compact fluorescent light according to the present invention. 1... Glass enclosure 2... Filament 6... Lead wire 4... Fluorescent material procedural amendment (voluntary) (February 24, 1980 Commissioner of the Japan Patent Office 1) Wakasugi: +-1 Daidono 1. Indication of the case (1981!1.1-Application No. 6315 2. Name of the invention: Small firefly) Shitou (3. Relationship with the person making the amendment 41 cases 1 representative from Bureau t'1) Yumoto Taizo 4, Agent 6, Number of inventions increased by amendment Tsusif Ill'18 Detailed explanation of the invention of the four rules subject to amendment 11) Contents of amendment 1) Opening page 1 Hakama, page 5, line 13 ``To the number V~200~・
ν” is r4W ~ 40νV J iC supplementary IE. 2) +T+'4 sy<t sriI--
−−1,'5νV J c> (g is 1− or less,
Inside? 7% D is 8 degrees or less” added 1-. 31 1ri1 6th white 4 I-chome 170 ma” is corrected to “59 questions”. that's all

Claims (1)

[Claims] 1. The total length of the lamp is 120n or less, and the power consumption is 1.5
A compact fluorescent lamp with a fluorescent light of W or less and a patented structure in which the electrode is of the thermionic emission type. 2. It is filled with a gas selected from argon, krypton, or neon at a pressure of 6 to 50 torr! 1)
A compact fluorescent light according to claim 1. B. A compact fluorescent light according to claim 1, wherein a three-wavelength type fluorescent material having high optical output at wavelengths of approximately 140 nm, 550 nm, and 610 nm is coated on the inner surface of a glass enclosure.