JPH06290757A - Rapidly starting fluorescent lamp - Google Patents

Abstract

PURPOSE:To lessen reduction of luminous flux with good appearance by providing a non-forming part in the peripheral direction in a bulb center part, in a transparent conductive film formed in a tubular bulb internal surface, so as to reduce the generation of yellow brown spotting and blackening after lighting for a long time. CONSTITUTION:A transparent conductive film 2, consisting of tin oxide with 1KOMEGA+ or -0.5KOMEGA resistance in each part, is applied to the internal surface of a straight tubular glass bulb 1. This film 2 has a non-forming part 3 in the peripheral direction for sectionally cutting the bulb in the intermediate part of the bulb 1. A protecting film 4, formed of high melting point metal oxide film of alumina, silica, titania, etc., is formed on the film 2 and the non-forming part 3, to further provide a phosphor film 5 overlapped in an upper surface. An electrode is sealed to both ends, and the inside is sealed with mercury and rare gas of about 330 pascal argon or the like, to obtain a fluorescent lamp. By lighting this lamp by an ordinary lighting device, the generation of blackening can be reduced with good startability.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rapid start type fluorescent lamp in which the resistance distribution of a transparent conductive coating formed on the inner surface of a tubular bulb is changed.

[0002]

2. Description of the Related Art Rapid-start fluorescent lamps are widely used in offices, department stores, etc. because they have good starting performance for lighting immediately after switching and do not require a lighting tube.

This rapid start type fluorescent lamp has a starting assisting function by forming a transparent conductive film such as tin oxide on the inner surface of a tubular glass bulb, and the lower the resistance value of the transparent conductive film, the more the starting. It is known that performance improves.

The formation of the transparent conductive film of tin oxide is
For example, spraying a tin chloride solution inward from the open end of the valve and thermally decomposing it to obtain a transparent conductive coating containing tin oxide as the main component and having an arbitrary resistance value, dimethyltin dichloride, etc. There is a CVD method in which the organic tin compound is heated to evaporate, and the vapor is sprayed on the inner surface of the valve to be thermally decomposed to obtain a transparent conductive film containing tin oxide as a main component.

Since the transparent conductive film is colored by the destruction due to the discharge and the formation of amalgam by the reaction between tin oxide and the mercury enclosed in the bulb, alumina is formed between the transparent conductive film and the phosphor film. A protective coating made of a refractory metal oxide coating such as silica or titania is provided.

[0006]

However, a rapid start type fluorescent lamp having such a structure is used for a long time (1
When it lights up for more than 000 hours, it is often 10 to 10 from the tube end.
Dark brown band-shaped spots (hereinafter referred to as E
It is called C blackening. ) Are generated, the appearance of the fluorescent lamp is significantly impaired and the luminous flux is also lowered.

The present invention has been made in view of these problems, and significantly reduces the occurrence of yellowish brown spots and blackening on the inner surface of the bulb after long-time lighting, and has a good appearance and reduced luminous flux even after long-time lighting. The object is to provide a rapid start type fluorescent lamp which has a small amount.

[0008]

In the rapid start type fluorescent lamp according to claim 1 of the present invention, a transparent conductive film is formed on the inner surface of the tubular bulb, and a fine melting point metal oxide such as alumina is finely formed on the transparent conductive film. A lamp comprising a protective coating made of powder and a phosphor coating, and a rare gas sealed inside.
The transparent conductive coating is characterized in that it has a non-formed portion in the circumferential direction in the central portion of the bulb.

In the rapid start type fluorescent lamp according to claim 2 of the present invention, a transparent conductive coating is formed on the inner surface of the tubular bulb, and a protective coating made of fine powder of refractory metal oxide such as alumina is formed on the transparent conductive coating. A fluorescent film is formed and a rare gas is sealed inside, and the transparent conductive film has a W-shaped distribution in which the resistance value is high at both ends and the center of the bulb. .

[0010]

The EC blackening can be reduced without impairing the startability.

[0011]

EXAMPLES Examples of the present invention will be described with reference to the fluorescent lamps shown in FIGS. In the figure, 1 is a straight tube type glass bulb, and 2 is a transparent conductive coating made of tin oxide having a resistance of 1 KΩ ± 0.5 KΩ applied to the inner surface of the bulb 1. The conductive coating 2 has a non-formation portion 3 where the coating 2 is not formed in the middle portion of the valve 1 in the circumferential direction of the valve 1.

A protective coating 4 made of a refractory metal oxide such as alumina, silica, or titania is formed on the transparent conductive coating 2 and the non-formed portion 3, and the protective coating 4 is further formed. Phosphor coating 5 on top
Are provided in layers. Further, electrodes 6 are sealed at both ends of the bulb 1, and mercury and a rare gas such as argon of about 330 Pascal are sealed inside.

The lamp L having such a structure was lit by using a normal lighting device, and the starting property and the occurrence state of EC blackening were investigated, but the starting property was good and no blackening occurred.

Usually, it is difficult to start when the resistance value is infinite on the whole surface, but there is no problem in starting when a part of the resistance value is high.

Further, according to the present invention, the resistance value of the transparent conductive coating is high at the end portion of the bulb, is lowered toward the center, and is increased again at the center portion. It was possible to prevent blackening.

[0016]

EFFECTS OF THE INVENTION Rapid start type fluorescent light that has good startability, reduces the occurrence of yellowish brown spots and blackening on the inner surface of the bulb after long-time lighting, has a good appearance even after long-time lighting, and has a small decrease in luminous flux. It is possible to provide a lamp.

[Brief description of drawings]

FIG. 1 is a sectional front view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional front view showing an enlarged main part of FIG.

[Explanation of symbols]

 L: Lamp 1: Bulb 2: Transparent conductive coating 3: Non-coating part 4: Protective coating 5: Phosphor coating

Claims (2)

[Claims] 1. A transparent conductive coating is formed on the inner surface of a tubular bulb, a protective coating made of fine powder of a refractory metal oxide such as alumina and a fluorescent coating are formed on the transparent conductive coating, and a rare gas is sealed inside. A rapid-start type fluorescent lamp, wherein the transparent conductive film has a non-forming portion in the circumferential direction in the central portion of the bulb. 2. A transparent conductive coating is formed on the inner surface of the tubular bulb, a protective coating made of fine powder of a refractory metal oxide such as alumina and a fluorescent coating are formed on the transparent conductive coating, and a rare gas is sealed inside. A rapid-start type fluorescent lamp, wherein the transparent conductive film has a W-shaped distribution in which the resistance value is high at both ends and in the center of the bulb.