JP2008123817A - Fluorescent lamp, and manufacturing method of fluorescent lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluorescent lamp equipped with a protective film capable of preventing contact of mercury with glass materials of a glass bulb and aiming at improvement of light extraction efficiency, other than a purpose of preventing exfoliation of a phosphor film. <P>SOLUTION: A protective film 20 having a rugged face 21 on its inner face is formed by applying dispersion liquid containing fine particles having two kinds of size distributions on an inner face of a glass tube body, and a phosphor film 30 is formed on the inner face of the protective film 20. Since a contact face of the phosphor film 30 with the protective film 20 is also to be of a rugged shape, a light emission direction is widened, and light beams transmitting the phosphor film 30 is dispersed at the rugged face 21 of the protective film 20 to be equally projected outside from the glass tube body 10 through the protective film. Ruggedness of the surface of the protective film 20 enables to effectively take in emission light from the phosphor film 30 on the inner face of the protective film 20, leading to improvement of luminance (brightness). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluorescent lamp and a method for manufacturing the fluorescent lamp, and more particularly to a fluorescent lamp having a protective film composed of powder having two types of particle size distribution on the inner surface of a glass tube and a method for manufacturing the fluorescent lamp.

  Conventionally, the structure of a filament type fluorescent lamp and a cold cathode fluorescent lamp is provided with a pair of electrodes each provided with a phosphor layer on the inner wall surface of a glass tube and sealed at both ends.

  In the present invention, a fluorescent lamp including a fluorescent lamp in which an electrode is a filament and discharge is performed between the filaments and a fluorescent lamp in which an electrode is a cold cathode electrode and a discharge is performed between cold cathode electrodes are simply referred to as a fluorescent lamp.

  When it is necessary to distinguish between the two, a fluorescent lamp in which the electrodes are filaments and discharge is performed between the filaments is referred to as a filament type fluorescent lamp, and a fluorescent lamp in which the electrodes are cold cathode electrodes is referred to as a cold cathode fluorescent lamp.

  The inside of the glass tube is sealed with a rare gas composed of, for example, a mixed gas of neon and argon and mercury as a discharge medium, and both ends of the glass tube are sealed, so that the inside of the glass tube is hermetically sealed. Has been.

  Although a phosphor film may be provided directly on the inner surface of the glass tube, it prevents the glass tube from being blackened or deteriorated due to the chemical reaction between the discharge medium such as mercury and the glass, or mercury deposition. Therefore, a protective film is also provided on the inner surface of the glass tube body.

  In this case, a protective film made of a metal oxide is usually formed on the inner surface of the glass tube by coating, and a phosphor film is further formed on the protective film.

  Along with recent demands for smaller and higher performance devices, there is a growing demand for smaller, higher performance, especially for cold-cathode fluorescent lamps, and improvements in light output characteristics from phosphor films, including improvements in phosphor materials. Is required. On the other hand, peeling of the phosphor film from the glass tube is also a problem.

  Japanese Patent Application Laid-Open No. 9-283082 discloses a cold cathode fluorescent bulb in which a concavo-convex surface is etched on the inner surface of a glass bulb and a phosphor film is formed on the concavo-convex surface. As a result, the visible light transmitted through the phosphor film is diffused on the uneven surface and is uniformly emitted as scattered light, and the brightness of the lamp surface becomes uniform, the luminous flux is improved, and peeling of the phosphor layer is prevented. ing.

  In Patent Document 2 (Japanese Patent Application Laid-Open No. 2005-340066), a frosted layer is formed on the inner wall of a glass tube by hydrofluoric acid treatment to reduce peeling failure, and a protective film or phosphor layer is formed on the frosted layer. A cold cathode fluorescent lamp is disclosed in which the phosphor layer is prevented from being peeled by forming.

Patent Document 3 (Japanese Patent Application Laid-Open No. 2003-272559) discloses a fluorescent lamp in which a protective film includes small phosphor particles and fine metal oxide particles. This protective film can suppress the permeation of mercury and can add a function of emitting fluorescence with high luminous efficiency to the protective film.
Japanese Patent Laid-Open No. 9-283082 JP 2005-340066 A JP 2003-272559 A

  In the cold cathode fluorescent bulb disclosed in Patent Document 1, although the brightness of the lamp surface is uniform, the luminous flux distribution is improved, and the phosphor film is prevented from being peeled off, the protective film is provided. Since there is no such thing, the problem remains that the mercury encapsulated in the glass bulb and the glass material constituting the glass bulb chemically react to color the transparent glass bulb and the luminous flux decreases over time. .

  The cold cathode fluorescent lamp disclosed in Patent Document 2 has an effect of reducing defects due to peeling of the phosphor layer. In addition, when the phosphor film is directly formed on the glass tube without providing a protective film, visible light transmitted through the phosphor film becomes scattered light and the brightness of the lamp surface becomes uniform by the frost treatment layer. There is an effect. However, there remains a problem that the mercury encapsulated in the glass bulb and the glass material constituting the glass bulb undergo a chemical reaction, whereby the transparent glass bulb is colored and the luminous flux decreases with time.

  When a protective film is provided, the chemical reaction between mercury and the glass material can be prevented, but since the joint surface of the protective film with the phosphor film is smooth, the visible light transmitted through the phosphor film becomes scattered light and becomes the lamp surface. The effect of making the brightness uniform is not obtained.

  In the fluorescent lamp disclosed in Patent Document 3, the protective film itself has a function of emitting fluorescence, but since the surface is not provided with an uneven structure, the visible light transmitted through the phosphor film becomes scattered light and the brightness of the lamp surface is increased. The effect of being uniform cannot be obtained.

  Conventionally, the purpose of the protective film has been to prevent blackening or deterioration of the glass tube, and there is a problem in not providing the protective film. Thus, although there is an example that the protective film itself has a fluorescence emission function, improvement of optical characteristics by the protective film itself has hardly been pursued.

  The object of the present invention is to prevent fluorescent lamps and fluorescent lamps having a protective film capable of improving the light intake efficiency, in addition to preventing contact between mercury and the glass material of the glass bulb and preventing peeling of the fluorescent film. It is to provide a manufacturing method.

The fluorescent lamp of the present invention is
A glass tube, a pair of electrodes provided in the glass tube, a protective film formed on the inner surface of the glass tube and composed of powder having two kinds of particle size distributions, and formed on the inner surface of the protective film And a discharge medium sealed inside the glass tube.

  The protective film may be a protective film formed by applying a dispersion containing powder having two types of particle size distributions to the inner surface of the glass tube, and the powder constituting the protective film is a metal oxide. The metal oxide may be a rare earth metal containing Y, Ce, or La, or an oxide of Ti, Si, Al, or Mg.

  The center particle size of the first fine particles of the metal oxide is in the range of 0.001 μm to 0.1 μm, preferably in the range of 0.001 μm to 0.01 μm, and the center particle size of the second fine particles of the metal oxide is It may be in the range of 1 μm to 6 μm, preferably in the range of 2 μm to 5 μm, and the amount of the second fine particles may be 1% or less, preferably 0.1% or less of the first fine particles.

  The discharge medium may be composed of mercury and a rare gas.

  The fluorescent lamp may be a filament type fluorescent lamp, and the discharge may be performed between the filaments, the fluorescent lamp may be a cold cathode fluorescent lamp, and the discharge may be performed between the cold cathode electrodes.

The method for producing the fluorescent lamp of the present invention comprises:
A fluorescent lamp comprising a glass tube, a pair of electrodes provided in the glass tube, a protective film and a phosphor film formed on the inner surface of the glass tube, and a discharge medium sealed in the glass tube In the manufacturing method, the protective film is formed using powder having two kinds of particle size distributions.

  The protective film may be formed by applying a dispersion liquid containing powder having two kinds of particle size distributions to the inner surface of the glass tube body.

  The fluorescent lamp of the present invention has a pair of electrodes therein, and is a discharge medium that has passed through the phosphor film on the inner surface of the glass tube body in which the discharge medium is sealed. The protective film is made of powder having two kinds of particle size configurations. Since the protective film made of powder having two kinds of particle size configurations is formed by coating on the inner surface of the glass tube body, a large diameter powder protrudes and becomes uneven on the inner surface which is the coating side at the time of coating. It has a shape. Since the contact surface of the phosphor film formed inside this surface also has an uneven shape, the light emitted from the uneven phosphor film is diffused and passes through the protective film and the glass tube to pass through the glass tube. The scattered light is radiated outward and the light radiation becomes uniform, so that the total luminous flux of the lamp can be improved. Since the surface of the protective film has irregularities, it is possible to more effectively capture light emitted from the phosphor film on the inner surface of the protective film, and the light becomes uniform, which leads to improvement in luminance (brightness).

  Since the present invention has a protective film on the inner surface of the glass tube, it is possible to prevent the discharge medium that has passed through the phosphor film from being colored by contact with the glass material of the mercury glass tube, and the inner surface of the protective film is The contact surface of the inner phosphor film also has an uneven shape because it has an uneven shape, and the light emitted from the uneven contact surface is diffused and passes through the protective film and the glass tube to the outside of the glass tube The scattered light is emitted in the form of scattered light, and the light emission is uniform, so that the total luminous flux of the lamp can be improved.

  In addition, since the contact surface of the phosphor film has an uneven shape, there is also an effect of preventing the phosphor film from peeling off.

  Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a cross-sectional view of a fluorescent lamp according to a first embodiment of the present invention, FIG. 2 is a partially enlarged view of a portion A in FIG. 1, and (a) is a first embodiment of the present invention. Yes, (b) is a conventional example. In the first embodiment, the fluorescent lamp is described as a filament type fluorescent lamp, but the present invention can be similarly applied to a cold cathode fluorescent lamp.

  As shown in FIG. 1, the fluorescent lamp 1 according to the first embodiment of the present invention includes a glass tube body 10 that is cylindrical and sealed at both ends, a protective film 20 that is applied to the inner surface of the glass tube body 10, The phosphor film 30 formed on the inner surface of the protective film and the electrode portions 40 provided at both ends of the glass tube 10 are filled with a discharge medium composed of mercury vapor 51 and rare gas 52. .

  The electrode unit 40 includes an electrode 41 that is connected to an external power source, a filament 42 that is connected to the electrode 41 and discharges, a base 43 that holds the electrode, and a stem 44 that fixes the electrode unit 40 to the glass tube 10. The

  The glass tube 10 is a base that constitutes the fluorescent lamp 1 and is made of a glass material. The composition of the glass material, the shape and size of the glass tube, etc. are not particularly limited, and the glass material may be translucent and not fragile. The shape of the glass tube body 10 is not limited to the illustrated tubular shape, and may be an annular shape or a globe shape.

  The protective film 20 suppresses the mercury vapor 51 that permeates into the phosphor film 30 from coming into contact with the glass tube body 10 and a chemical reaction between them, and ultraviolet rays that pass through the phosphor film 30 irradiate the glass tube body 10. Thus, acceleration of the above-described chemical reaction is also suppressed. Thereby, blackening and discoloration of the glass tube 10 caused by a chemical reaction are suppressed, and a decrease in luminous flux of the fluorescent lamp 1 is suppressed. The thickness of the protective film is not particularly limited, but if it is thick, the transmittance is lowered, so that it is preferably 3 μm or less.

  The protective film 20 of the present invention is formed by applying a dispersion liquid containing powder having two kinds of particle size distributions to the inner surface of the glass tube body 10. The powder constituting the protective film is fine particles of metal oxide, and the metal oxide is preferably a material having the property of absorbing ultraviolet rays, and is not compatible with mercury (for example, oxidation that tends to become + as surface charge) Or an oxide having a refractive index lower than that of glass.

  Specifically, it is desirable that the metal oxide is an oxide of any of rare earth metals including Y, Ce, and La, Ti, Si, Al, and Mg.

  The central particle diameter of the first fine particles of the metal oxide is in the range of 0.001 μm to 0.1 μm, preferably in the range of 0.001 μm to 0.01 μm, and the central particle diameter of the second fine particles is 1 μm to 6 μm. In the range, preferably in the range of 2 μm to 5 μm, the amount of the second fine particles is 1% or less, preferably 0.1% or less of the first fine particles.

  In the conventional protective film, as shown in FIG. 2B, the surface of the conventional protective film 22 is flat, and the phosphor film 30 is formed thereon, and the light emitting surface of the phosphor film 30 is flat. It was close to the state.

  The surface of the protective film formed by applying the dispersion liquid containing the powder having two kinds of particle size distributions as described above to the inner surface of the glass tube body 10 is a particle having a large diameter as shown in FIG. Are arranged on the surface to form the uneven surface 21. The surface of the phosphor film 30 formed thereon also becomes an uneven surface 21, and light emitted from the particles on the surface is diffused and incident on the protective film 20, passes through the protective film 20 and the glass tube 10, and has a wide angle to the outside. Is projected on.

  In such a fluorescent lamp 1, when a voltage is applied between both electrode portions 40, a discharge occurs between both filaments 42, the fluorescent lamp 1 emits light, and the emitted light is emitted from the phosphor film 30, the protective film 20 and the glass tube. 10 is transmitted to the outside. In the conventional fluorescent lamp 2 shown in FIG. 2B, the light beam that has passed through the phosphor film 30 is projected outside from the glass tube body 10 in that direction.

  In the fluorescent lamp 2 of the present invention shown in FIG. 2 (a), the light beam that has passed through the phosphor film 30 is diffused by the uneven surface 21 of the protective film 20 and passes through the protective film 20 to the outside of the glass tube body 10 at a wide angle. Is projected evenly.

  As described above, the protective film 20 of the present invention prevents mercury vapor 51 that permeates into the phosphor film 30 from contacting the glass tube body 10 to cause a chemical reaction, and ultraviolet rays that pass through the phosphor film 30 are glass. Along with the effect of preventing the chemical reaction from coming into contact with the tubular body 10, the light transmitted through the phosphor film 30 is diffused by the uneven surface 21 of the protective film 20, and passes through the protective film 20 to form a glass tube body. 10 Has the role of projecting equally to the outside.

  Further, the contact surface between the phosphor film 30 and the protective film 20 is an uneven surface 21, and the contact area is large, so that the phosphor film 30 is prevented from being peeled off.

  FIG. 3 is a sectional view of the fluorescent lamp according to the second embodiment of the present invention. The fluorescent lamp 2 of the second embodiment is a cold cathode fluorescent lamp in which discharge is performed between the cold cathode electrodes 47. The electrode part 45 of the second embodiment is different from the first embodiment in that the electrode part 45 is composed of an incoming line 46 and a cold cathode electrode 47. Since the configuration other than the electrode unit 45 is the same as that of the first embodiment and has the same function, the description of the configuration and operation is omitted using the same reference numerals. The configuration of the present embodiment can be applied not only to a cold cathode fluorescent lamp but also to all discharge lamps using a phosphor.

It is sectional drawing of the fluorescent lamp of the 1st Embodiment of this invention. It is the elements on larger scale of the A section of FIG. 1, (a) is the 1st Embodiment of this invention, (b) is a prior art example. It is sectional drawing of the fluorescent lamp of the 2nd Embodiment of this invention.

Explanation of symbols

1, 2, 3 Fluorescent lamp 10 Glass tube 20 Protective film 20a Large particle 20b Small particle 21 Uneven surface 22 Conventional protective film 30 Phosphor film 40, 45 Electrode part 41 Electrode 42 Filament 43 Base 44 Stem 46 Inlet 47 Cold cathode electrode

Claims (10)

A glass tube,
A pair of electrodes provided in the glass tube;
A protective film formed on the inner surface of the glass tube body and composed of powder having two kinds of particle size distributions;
A phosphor film formed on the inner surface of the protective film;
A fluorescent lamp comprising: a discharge medium enclosed in the glass tube body. The fluorescent lamp according to claim 1, wherein
The fluorescent lamp, wherein the protective film is a protective film formed by applying a dispersion liquid containing powder having two kinds of particle size distributions to the inner surface of the glass tube body. The fluorescent lamp according to claim 1 or 2,
A fluorescent lamp in which the powder constituting the protective film is metal oxide fine particles. The fluorescent lamp according to claim 3, wherein
The fluorescent lamp in which the metal oxide is an oxide of any of rare earth metals including Y, Ce, and La, Ti, Si, Al, and Mg. The fluorescent lamp according to claim 3, wherein
The central particle diameter of the first fine particles of the metal oxide is in the range of 0.001 μm to 0.1 μm, preferably in the range of 0.001 μm to 0.01 μm. A fluorescent lamp having a diameter in the range of 1 μm to 6 μm, preferably in the range of 2 μm to 5 μm, and the amount of the second fine particles is 1% or less, preferably 0.1% or less of the first fine particles. The fluorescent lamp according to claim 1, wherein
A fluorescent lamp in which the discharge medium is composed of mercury and a rare gas. The fluorescent lamp according to any one of claims 1 to 6,
The fluorescent lamp is a filament type fluorescent lamp, and discharge is performed between the filaments. The fluorescent lamp according to any one of claims 1 to 6,
The fluorescent lamp is a cold cathode fluorescent lamp, and the discharge is performed between cold cathode electrodes. A glass tube, a pair of electrodes provided in the glass tube, a protective film and a phosphor film formed on the inner surface of the glass tube, and a discharge medium sealed in the glass tube. A fluorescent lamp manufacturing method comprising:
A method of manufacturing a fluorescent lamp, wherein the protective film is constituted by using powders having two kinds of particle size distributions. In the manufacturing method of the fluorescent lamp of Claim 9,
A method for producing a fluorescent lamp, wherein the protective film is formed by applying a dispersion liquid containing powder having two types of particle size distributions to the inner surface of the glass tube.

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