WO2006051979A1 - 蛍光ランプ - Google Patents
蛍光ランプ Download PDFInfo
- Publication number
- WO2006051979A1 WO2006051979A1 PCT/JP2005/020919 JP2005020919W WO2006051979A1 WO 2006051979 A1 WO2006051979 A1 WO 2006051979A1 JP 2005020919 W JP2005020919 W JP 2005020919W WO 2006051979 A1 WO2006051979 A1 WO 2006051979A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- phosphor
- fluorescent lamp
- phosphor layer
- less
- lamp
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/54—Screens on or from which an image or pattern is formed, picked-up, converted, or stored; Luminescent coatings on vessels
- H01J1/62—Luminescent screens; Selection of materials for luminescent coatings on vessels
- H01J1/63—Luminescent screens; Selection of materials for luminescent coatings on vessels characterised by the luminescent material
Definitions
- the present invention relates to a fluorescent lamp, and more particularly to a fluorescent lamp used for a backlight for a liquid crystal display or the like.
- Fluorescent lamps are often used as light sources for indoor lamps, street lamps, and various home appliances.
- a vacuum glass tube is used for these fluorescent lamps.
- a vacuum glass tube is generally coated with a phosphor on the inner wall of the glass tube, and a rare gas such as neon gas or argon gas and a small amount of mercury are enclosed in the glass tube.
- a discharge electrode is also disposed in the glass tube. By applying a voltage to the discharge electrode, a discharge is generated to excite mercury and to emit ultraviolet light with a wavelength of 254 nm. When this ultraviolet light is irradiated to the phosphor, the phosphor is excited and emits visible light to form a lamp.
- Fluorescent lamps include a hot cathode fluorescent lamp that emits thermoelectrons and excites mercury, and a cold cathode fluorescent lamp that emits electrons and excites mercury by applying a voltage to an electrode.
- a hot cathode fluorescent lamp that emits thermoelectrons and excites mercury
- a cold cathode fluorescent lamp that emits electrons and excites mercury by applying a voltage to an electrode.
- 254 nm ultraviolet light emitted by excited mercury excites the phosphor and emits visible light to emit light.
- a glass tube is used as the discharge tube.
- phosphors of long wavelength excitation type red
- medium wavelength excitation type green
- short wavelength excitation type blue
- a white lamp emits white light by blending each of the above red, green, and blue in an arbitrary ratio. Phosphors produce visible light when a dopant such as europium on the surface is excited.
- the particle size of a normal phosphor is 2 ⁇ m or more.
- the phosphor has a thickness of about 10 m. Formed as a layer.
- Japanese Patent Application Laid-Open No. 2003-027051 discloses a technique using a composite phosphor in which a phosphor having a small particle size is attached to an inorganic compound having a large particle size.
- fluorescent lamps known as low power consumption type lamps have been further pursued from the viewpoint of energy consumption, and further lower power consumption has been demanded.
- the power consumption of cold cathode lamps used as backlights for liquid crystal displays used in home appliances, such as personal computers and televisions accounts for about 40% of the power consumption of large LCD televisions of 32 inches or more. . For this reason, cold cathode lamps are required to further reduce power consumption for application to low power consumption home appliances.
- the luminance uniformity in the lamp is a problem. This is a phenomenon that occurs due to unevenness in the phosphor layer and causes a significant loss of display quality.
- the cause of the unevenness of the phosphor layer lies in the fluorescent lamp manufacturing process.
- the fluorescent lamp manufacturing process includes a step of applying a solvent in which a phosphor having a large particle size is dispersed to the inner wall of the lamp and drying it. In this process, a large phosphor settles in the lower portion, that is, in the direction of gravity due to gravity, so that the phosphor layer is uneven. Therefore, the current situation is that the fundamental solution to the need to devise the application method has not yet been reached.
- An object of the present invention is to provide a fluorescent lamp that reduces the power consumption of the fluorescent lamp, improves the luminous efficiency, and eliminates uneven brightness.
- the fluorescent lamp according to the present invention is characterized in that the average particle diameter of the phosphor used in the phosphor layer formed on the inner wall of the lamp tube is 1 ⁇ m or less and 0.01 ⁇ m or more. .
- the layer thickness of the phosphor layer is preferably 5 m or less, and preferably 0.0 or more.
- the phosphor is a long wavelength excitation type (red), medium wavelength It is preferable to mix excitation type (green) and short wavelength excitation type (blue).
- FIG. 1 is a diagram showing measurement results of luminance when the particle diameter and layer thickness of a phosphor are changed.
- FIG. 2 is a diagram showing the correlation between the phosphor layer thickness and the luminance.
- the phosphor in the present invention is, for example, europium-doped barium Z magnesium.
- Ordinary phosphors such as Z aluminum salts can be used.
- the particle diameter of the phosphor is preferably 1 ⁇ m or less, more preferably 0.7 ⁇ m or less, and even more preferably 0.5 m or less.
- the particle diameter of the phosphor is 1 m or more, it is not preferable because the phosphor particles are settled at the time of coating as well as the luminous efficiency is lowered and unevenness occurs in the phosphor layer. Further, it is not preferable that the particle diameter of the phosphor is 0.01 m or less because the phosphor production efficiency is deteriorated.
- the particle diameter here is an average particle diameter, and is simply referred to as a particle diameter hereinafter.
- the method for producing the phosphor is not particularly limited.
- a method of pulverizing a lump of phosphor is generally used, but a method of squeezing a film produced by vapor deposition or sputtering or a method of growing minute crystal nuclei may be used.
- a method of sieving and a method of separating by sedimentation in a liquid are also effective.
- the layer thickness of the phosphor layer using a phosphor having a small particle diameter is preferably 5 ⁇ m or less, more preferably 3 / zm or less, and 1 ⁇ m or less. More preferably.
- a phosphor layer thickness of 5 m or more is not preferable because the phosphor layer becomes dense and the efficiency of emitting visible light to the outside of the lamp decreases.
- a phosphor layer having a thickness of 0.1 ⁇ m or less is not preferable because of difficulty in manufacturing.
- the phosphor coating method is not particularly limited, but there is usually a method in which a polymer such as nitrocellulose is dissolved, the phosphor is dispersed in a solvent whose viscosity is adjusted, and the obtained dispersion is coated.
- a polymer such as nitrocellulose
- the phosphor is dispersed in a solvent whose viscosity is adjusted, and the obtained dispersion is coated.
- one end of a glass tube is placed in a dispersion and the dispersion
- the method of applying by sucking up and discharging is generally used.
- a flat lamp it can be applied by spin coating or by dropping the dispersion liquid and stretching it with a flat stick like a doctor blade!
- a phosphor having a particle diameter of 1 ⁇ m prepared by a pulverization method was dissolved in butyl acetate solvent in which nitrocellulose was dissolved and thickened, dispersed by stirring, and allowed to stand for 10 minutes. It was confirmed that the phosphor did not settle to the bottom. As a comparative example, when a normal phosphor was dispersed in the same solvent, it was confirmed that the phosphor had settled after 1 minute.
- a normal phosphor such as barium Z magnesium Z aluminum salt doped with europium can be used.
- Phosphors are usually of long wavelength excitation type (red), medium wavelength excitation type (green), and short wavelength excitation type (blue).
- a white lamp emits white light by mixing three types in any proportion.
- the phosphor is excited by a dopant such as europium on its surface to produce visible light.
- the phosphor in the present invention does not settle in the solvent, it does not settle in the step of applying to a fluorescent lamp and drying. Therefore, the phosphor is uniformly present throughout the coating process, so that the effective surface area of the coating film is large and the luminous efficiency can be increased. In addition, since the phosphor is uniformly present in the coating film, luminance unevenness can be suppressed as a result of non-uniformity. In addition, since the luminous efficiency can be improved, the power consumption can be reduced.
- Example 1 The dispersion prepared in Example 1 was dip-coated on a borosilicate glass plate having a side of 40 mm and a thickness of 1 mm, with one side masked, and the mask was removed, followed by baking at 400 ° C. As a result, a phosphor layer having a thickness of 2 m was formed (phosphor-coated glass A). The luminance of the side of the plate was measured by applying ultraviolet light of 254 nm to the side on which the phosphor layer was applied.
- a phosphor layer with a layer thickness of 10 m (phosphor-coated glass B) and a phosphor layer with a layer thickness of 10 ⁇ m and a particle diameter of 3 ⁇ m are formed using the same dispersion. (Phosphor coated glass c) and the brightness was measured.
- the phosphor-coated glass A had a brightness 7 times that of the phosphor-coated glass B and 3 times that of the phosphor-coated glass C.
- the phosphor-coated glass C was confirmed to have uneven brightness, but the phosphor-coated glass A was not observed to have uneven brightness.
- the fluorescent lamp according to the embodiment of the present invention it is possible to obtain a fluorescent lamp with lower power consumption and having higher luminance with less luminance unevenness.
- Example 3 In the same manner as in Example 2 as Example 3, phosphors having different particle diameters were dipped in different thicknesses with one side masked on a borosilicate glass plate having a side of 40 mm and a thickness of 1 mm. After coating, removing the mask, and sintering at 400 ° C, various phosphor layers with different particle diameters and different layer thicknesses were formed. 254 nm ultraviolet light was applied to the side coated with these various phosphor layers, and the luminance on the side not coated was measured. These levels and measurement results are shown in Figs.
- the brightness of the phosphor with a particle diameter of 0.5 ⁇ m is indicated by a line (A) in FIG. 2, and the brightness with a particle diameter of 4 ⁇ m is indicated by a line (B) in FIG.
- the brightness of the phosphor at a particle diameter of 0.5 ⁇ m is 4000 (cd Zm 2 ) at a layer thickness of 0.8 ⁇ m and 500 (cdZm 2 ) at a layer thickness of 10 / zm.
- the brightness difference (unevenness) is smaller as the phosphor layer thickness is smaller.
- the phosphor layer cannot be coated with a small thickness, and therefore a uniform layer thickness cannot be obtained when the layer thickness is 4 m.
- the layer thickness is 10 m
- the luminance is low (300 (cdZm 2 )) and the luminance unevenness is as large as 150 or more compared to the phosphor particle size of 0.5 m. The smaller the is, the lower the luminance unevenness with higher luminous efficiency.
- the phosphor particle size is preferably 1 ⁇ m or less, more preferably 0.7 ⁇ m or less, and even more preferably 0.5 m or less. preferable. If the particle diameter of the phosphor is 1 m or more, it is not preferable because the phosphor particles settle out during the coating process and the luminance unevenness is generated. Also, the particle size of the phosphor is 0 If it is less than 01 / zm, the phosphor production efficiency deteriorates, which is not preferable.
- the thickness of the phosphor layer using a phosphor having a small particle diameter is preferably 5 ⁇ m or less, more preferably 3 / zm or less, and 1 ⁇ m or less. More preferably.
- the layer thickness is 5 m or more, the phosphor layer becomes dense, and the efficiency of emitting visible light to the outside of the lamp decreases, which is not preferable.
- a phosphor layer having a layer thickness of 0.1 ⁇ m or less is not preferable because of difficulty in manufacturing.
- the fluorescent lamp according to the present invention can increase the effective surface area of the phosphor and increase the conversion efficiency by using a phosphor having a small particle size.
- a phosphor having a small particle size by making the phosphor layer thin, it becomes possible to efficiently emit visible light converted by the phosphor to the outside of the lamp.
- the Brownian motion region can be dispersed and does not settle, so that unevenness in coating can be eliminated. As a result, it becomes possible to control the luminance unevenness in the fluorescent lamp.
- the fluorescent lamp according to the present invention is particularly suitable for a backlight light source for a liquid crystal display, and is not limited to this, and can be used as another light source.
Landscapes
- Vessels And Coating Films For Discharge Lamps (AREA)
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/918,068 US8294352B2 (en) | 2004-11-15 | 2005-11-15 | Fluorescent lamp |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-330262 | 2004-11-15 | ||
JP2004330262A JP2006140083A (ja) | 2004-11-15 | 2004-11-15 | 蛍光ランプ |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006051979A1 true WO2006051979A1 (ja) | 2006-05-18 |
Family
ID=36336644
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/020919 WO2006051979A1 (ja) | 2004-11-15 | 2005-11-15 | 蛍光ランプ |
Country Status (3)
Country | Link |
---|---|
US (1) | US8294352B2 (ja) |
JP (1) | JP2006140083A (ja) |
WO (1) | WO2006051979A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007311302A (ja) * | 2006-05-22 | 2007-11-29 | Stanley Electric Co Ltd | 放電ランプ |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2012146064A1 (zh) * | 2011-04-27 | 2012-11-01 | Mii Jenn-Wei | 光学薄膜灯可见光涂布区出光结构的改善装置 |
JP5885499B2 (ja) * | 2011-12-27 | 2016-03-15 | 株式会社ディスコ | バイト切削方法 |
DE102014204172A1 (de) * | 2014-03-06 | 2015-09-24 | Osram Gmbh | Niederdruckentladungslampe |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000156202A (ja) * | 1998-11-18 | 2000-06-06 | Matsushita Electric Ind Co Ltd | 蛍光ランプ |
JP2000336353A (ja) * | 1999-05-28 | 2000-12-05 | Kasei Optonix Co Ltd | アルミン酸塩蛍光体の製造方法 |
JP2001303045A (ja) * | 2000-04-19 | 2001-10-31 | Konica Corp | 無機蛍光体 |
JP2003187750A (ja) * | 2001-12-19 | 2003-07-04 | Harison Toshiba Lighting Corp | 蛍光ランプおよび照明装置 |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5644193A (en) * | 1993-12-17 | 1997-07-01 | Kabushiki Kaisha Toshiba | Phosphor, cathode-ray tube, fluorescent lamp and radiation intensifying screen |
US5731659A (en) * | 1996-05-13 | 1998-03-24 | General Electric Company | Fluorescent lamp with phosphor coating of multiple layers |
JPH11312491A (ja) * | 1998-04-28 | 1999-11-09 | Matsushita Electron Corp | 蛍光ランプおよびその製造方法 |
US6528938B1 (en) * | 2000-10-23 | 2003-03-04 | General Electric Company | Fluorescent lamp having a single composite phosphor layer |
JP3695744B2 (ja) | 2001-07-11 | 2005-09-14 | 松下電器産業株式会社 | 複合蛍光体及びそれを用いた蛍光ランプ |
JP2004137480A (ja) * | 2002-09-20 | 2004-05-13 | Tdk Corp | 蛍光体薄膜およびその製造方法ならびにelパネル |
-
2004
- 2004-11-15 JP JP2004330262A patent/JP2006140083A/ja active Pending
-
2005
- 2005-11-15 WO PCT/JP2005/020919 patent/WO2006051979A1/ja active Application Filing
- 2005-11-15 US US11/918,068 patent/US8294352B2/en not_active Expired - Fee Related
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000156202A (ja) * | 1998-11-18 | 2000-06-06 | Matsushita Electric Ind Co Ltd | 蛍光ランプ |
JP2000336353A (ja) * | 1999-05-28 | 2000-12-05 | Kasei Optonix Co Ltd | アルミン酸塩蛍光体の製造方法 |
JP2001303045A (ja) * | 2000-04-19 | 2001-10-31 | Konica Corp | 無機蛍光体 |
JP2003187750A (ja) * | 2001-12-19 | 2003-07-04 | Harison Toshiba Lighting Corp | 蛍光ランプおよび照明装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007311302A (ja) * | 2006-05-22 | 2007-11-29 | Stanley Electric Co Ltd | 放電ランプ |
Also Published As
Publication number | Publication date |
---|---|
JP2006140083A (ja) | 2006-06-01 |
US20080197762A1 (en) | 2008-08-21 |
US8294352B2 (en) | 2012-10-23 |
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