JPH0644477B2 - Fluorescent tube for light source - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fluorescent tube for a light emitting type light source, and more particularly to an electrode structure of an anode electrode.

[Prior Art] FIG. 2 is a cross-sectional view of an essential part showing the structure of a conventional fluorescent tube for a light emitting type light source. In the figure, 1 is a glass bulb, 2 is a stem glass, 3 is an exhaust pipe, 4 is a lead pin, 5 is a stem, 6 is a cathode, 7 is an anode ring, 8 is a fluorescent screen,
9 is A1 metal back layer, 10 is anode ring 7 and A
1 is a carbon film that makes electrical contact with the metal back layer 9.

[Problems to be Solved by the Invention] However, the conventional fluorescent tube for the light emitting type light source has the following problems because the carbon film 10 coated with carbon is used as the anode electrode.

(1) Since the carbon film 10 is extremely porous, it easily absorbs water, gas, etc. Therefore, after tube formation, the amount of gas released into the tube increases due to the effects of temperature, applied voltage, etc. Deterioration in brightness due to gas adsorption on the cathode, phosphor alteration, and damage to the cathode due to abnormal discharge increase. These lead to a decrease in display quality and an increase in defective products.

(2) In order to make sufficient electrical contact between the carbon film 10 and the A1 metal back layer 9, it is necessary to securely bond them, but in the case of the carbon film 10, the unevenness of the film surface is severe. The A1 metal back layer 9 formed of the A1 vapor deposition film may be cut in the middle. Since the carbon film 10 is opaque, it cannot be formed down to the lower side of the phosphor screen (in short, the carbon film 1 is not formed on the side from which light is emitted).
0 must not exist). Therefore, the contact portion with the A1 metal back layer 9 is limited to only the end portion of the carbon film 10.

(3) The carbon liquid used to form the carbon film 10 is a mixture of powdered carbon, water and a small amount of a binder, and if excessive mechanical vibration or rubbing is applied after the carbon film is formed. The carbon film 10 is easily peeled off and dropped, and when the dropped carbon pieces enter between the electrodes, abnormal discharge is caused, and when the carbon pieces are attached to the fluorescent surface, light emission is hindered and defective products increase.

(4) Since the carbon film 10 is black and opaque, the internal structure of the tube cannot be completely seen from the outside, and therefore the getter film scattering condition, the A1 metal back layer 9 condition, and the phosphor screen 8 It is completely impossible to inspect the condition of the unevenness of the, and there was a great obstacle to the inspection after the sealing and exhausting process and the analysis of defective products.

(5) When the carbon film 10 is formed by using the carbon liquid, unless the coating amount of the carbon liquid is properly controlled, “dripping” occurs, and the carbon adheres to the portion where the fluorescent surface 8 should be formed. It becomes defective. Further, when the carbon liquid in use is left to stand, it settles on the bottom of the container, so it is necessary to constantly stir the liquid, which requires man-hours for managing the liquid.

[Means for Solving the Problems] In order to solve such problems, a fluorescent tube for a light-emitting type light source according to the present invention is a transparent electrode made of a transparent conductive film in which a part of an anode electrode is in close contact with a glass substrate. A phosphor screen, which is formed and is metal backed, is formed on a part of the transparent electrode, the metal back is connected to a part of the transparent electrode, and an anode ring is connected to an end of the transparent electrode.

[Operation] In the present invention, since the transparent electrode made of the transparent conductive film is used as a part of the anode electrode, the transparent electrode is firmly adhered to the inside of the glass bulb, and sufficient electrical contact with the metal back layer is achieved. In addition, the peeling and dropping of the transparent electrode and the generation of released gas are eliminated.

Embodiments Embodiments of the present invention will be described in detail below with reference to the drawings.

FIG. 1 is a sectional view of an essential part showing the structure of an embodiment of a fluorescent tube for a light emitting type light source according to the present invention. In the figure, a predetermined glass bulb 1 is washed and dried, and a transparent electrode 11 made of a transparent conductive film is attached to a predetermined position in the glass bulb 1 by a thermal decomposition method of an organometallic compound. This transparent electrode 1
As a method of forming No. 1, for example, an organometallic compound solution containing at least one of 1n, Sn or Zn is injected into a predetermined glass bulb 1, and after a certain period of time, suction removal is performed. In this state, the organic metal compound is applied to the inside of the glass bulb 1, so that the transparent electrode 11 is formed in the glass bulb 1 by heating in the atmosphere at 500 ° C. for 10 minutes to decompose. As another method, a predetermined glass bulb 1 is set in a vacuum container (a mask is attached if necessary), and an oxide containing at least one of 1n, Sn or Zn is used as a target. Sputtering is performed on the inner surface of the glass bulb 1. The Ar pressure during this sputtering was 2 × 10 ⁻³ Torr, the RF output was 300 W, and the transparent electrode 1 had a film thickness of about 1000 Å in 10 minutes.
1 may be formed. Further, other methods for forming the transparent electrode 11 include a vacuum vapor deposition method, an electron beam vapor deposition method,
There are high frequency heating method, CVD method, electroless plating method,
Of course, they can be used. Next, the phosphor is injected into the glass bulb 1 having the transparent electrode 11 formed on the inner surface thereof, and is deposited on the head of the glass bulb 1 by the precipitation method to form the phosphor screen 8. After drying, the phosphor screen 8 is wetted, a filming film is formed on the surface of the phosphor screen 8, and then a metal back of A1 is performed, and an A1 vapor deposition film of about 800 to 2000 Å is formed on the filming film. Become A1
The metal back layer 9 is formed. Then about 460 ℃,
Firing is performed for about 10 minutes, the filming film is burned and decomposed, and the A1 metal back layer 9 is attached on the fluorescent screen 8 to complete the fluorescent screen for the light source tube. Next, the stem 5 in which the cathode 6 and the anode ring 7 are assembled is inserted into the glass bulb 1, and the stem glass 2 is heated by a gas burner to melt the glass to melt the glass bulb 1 and the stem glass 2.
And are melted to form a tube. Next, air is exhausted from the exhaust tube 3 of the bulb to make the inside of the tube vacuum, and then sealing is performed to complete the light source tube.

The fluorescent tube for a light-emitting type light source configured as described above causes a current to flow through the cathode 6 to generate electrons e, and the electrons e are generated by the grid.
Are extracted and accelerated by the anode ring 7 to which a few KV is applied, and electrons e are made to strike the phosphor screen 8. Here, since the anode ring 7, the transparent electrode 11 and the A1 metal back layer 9 are electrically coupled to each other, the voltage applied to the anode ring 7 is directly applied to the A1 metal back layer 9, The electron e accelerated by the voltage of several KV is A1
It passes through the metal back layer 9 and enters the phosphor screen 8 to cause the phosphor to emit light. The emitted light is emitted from the head of the glass bulb 1 to the outside through the phosphor layer, and the light heading for the A1 metal back layer 9 is reflected here and is also emitted from the head of the glass bulb 1 to the outside. It will be.

According to this structure, unlike the carbon film, the transparent electrode 11 has a very smooth and dense non-granular film structure. Since the amount is small, the deterioration of the brightness of the phosphor screen 8 and the deterioration of the cathode due to the abnormal discharge due to the released gas can be significantly reduced. In addition, this transparent electrode 11
Is extremely smooth and dense, so A1 is placed on this transparent electrode 11.
Even if the metal back layer 9 is formed, sufficient electrical contact can be established. Furthermore, since the transparent electrode 11 made of a transparent conductive film is substantially transparent in the visible light to infrared region, there is no problem even if the fluorescent surface 8 is formed on the transparent electrode 11 to cause it to emit light, and the light is emitted to the outside. Can be taken out. Therefore, since the transparent electrode 11 can be formed on the lower side of the fluorescent screen 8 (in short, between the glass bulb 1 and the fluorescent screen 8), when the A1 metal back layer 9 is formed on the fluorescent screen 8, the end of the fluorescent screen 8 can be formed. Transparent electrode 11 through a portion (here, since the phosphors are sparsely attached, there is a pinhole)
And the A1 metal back layer 9 can be contacted with each other, so that there is no contact failure. Further, since the transparent electrode 11 is firmly attached to the inner surface of the glass bulb 1, it is not peeled off or dropped at all due to some vibration or friction, which causes foreign matter in the tube to cause abnormal discharge,
It does not interfere with the light emission of the phosphor screen 8. Further, since the transparent electrode 11 is substantially transparent, the structure inside the glass bulb 1, the state of the film, etc. can be discriminated at a glance, and for example, the color tone of the A1 metal back layer 9, the degree of reflection on the surface, the coating area, the fluorescent surface. The concavo-convex state of 8, the getter film covering area, the color tone, and the degree of gas adsorption can be easily discriminated. There are various methods for producing the transparent electrode 11, but since a coating method in a vacuum or reduced pressure or a thermal decomposition method is used,
No defects due to "dripping" such as when using a carbon liquid are eliminated, and it is not necessary to constantly stir the coating liquid.

[Effects of the Invention] As described above, according to the present invention, by using a transparent electrode as an anode electrode, moisture, occluded gas and the like are extremely reduced as compared with a conventional carbon film, and the amount of released gas is small. Luminance deterioration of the phosphor screen and cathode deterioration due to abnormal discharge due to released gas can be significantly reduced. Further, since the contact between the transparent electrode and the A1 metal back layer and the contact between the transparent electrode and the anode ring are extremely good, there is no contact failure and the reliability can be remarkably improved. Further, since the transparent electrode is firmly adhered to the inner surface of the glass bulb, it is prevented from peeling off or falling off due to some vibration or friction, which may prevent abnormal discharge in the glass bulb and light emission from the fluorescent surface. There is nothing, and it has an extremely excellent effect that a fluorescent tube for a light emitting type light source with high quality and high reliability can be obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of an essential part showing the structure of an embodiment of a fluorescent tube for a light-emitting light source according to the present invention, and FIG. 2 is a cross-sectional view of an essential part showing the structure of a conventional fluorescent tube for a light-emitting light source. 1 ... Glass bulb, 2 ... Stem glass, 3 ... Exhaust pipe, 4 ... Lead pin, 5 ... Stem, 6 ... Cathode, 7 ... Anode ring, 8 ... Fluorescent screen, 9 ... A1
Metal back layer, 11 ... Transparent electrode.

Front page continuation (72) Inventor Yuuyuki Nakanishi 700 Wada, Ueno Town, Ise City, Mie Prefecture, Ise Electronics Industry Co., Ltd. (56) (JP, B2)

Claims (1)

[Claims] 1. A fluorescent tube for a light-emitting light source, wherein an anode electrode is formed inside a glass tube, wherein a part of the anode electrode is formed of a transparent electrode made of a transparent conductive film adhered onto a glass substrate and the transparent A metal-backed phosphor screen is formed on a part of the electrode, the metal back is connected to a part of the transparent electrode, and an anode ring is connected to an end of the transparent electrode. Fluorescent tube for light emitting type light source.