CN101567294A - Ultraviolet electric discharge lamp - Google Patents

Abstract

The invention provides an ultraviolet discharge lamp, wherein 100% of the parent material contains a transparent glass luminescent tube (11) made of soda lime glass containing more than 10% of sodium oxide, which can obtain the 320-340nm wavelength required by the ultraviolet discharge lamp and transmit more than 80%. Overrate. The tube diameter D of luminous tube (11) is for example 38mm, and tube length L is 2650mm, and rare gas such as argon gas and a certain amount of mercury are sealed in luminous tube (11). The inner surface of the luminous tube (11) is coated with an ultraviolet luminescent phosphor having a changing efficiency peak between 300nm and 340nm. In this way, the illuminance at 320 to 340 nm can be increased.

Description

UV discharge lamp

technical field

The present invention relates to a kind of ultraviolet discharge lamp that is used in the manufacturing process of liquid crystal panel for example to carry out ultraviolet radiation to polymerize or harden polymer material, more specifically, relates to a kind of phosphor that is coated or film thickness is selected to improve luminescence efficient UV discharge lamps.

Background technique

The ultraviolet discharge lamp of Japanese Patent Application Laid-Open 2002-358926 (Prior Art 1) is formed with an airtight container, and the airtight container is a luminous tube made of soda lime glass that can transmit ultraviolet rays with a wavelength of 253.7nm. The discharge medium of mercury and rare gas, a pair of electrodes are arranged inside the luminous tube to generate low-pressure mercury vapor discharge. On the inner surface of the luminous tube, it is coated with BaSi2O5:Eu, Ce(MeBa)Al11O19, YPO4 with a wavelength of 320-400nm, which is excited by a mercury bright line with a wavelength of 253.7nm emitted by the low-pressure mercury vapor discharge of the discharge medium. :Ce, LaPO4:Ce or at least one of phosphors such as Ce, or a combination thereof, can simultaneously obtain light in the UV-A region with high penetrability inside the ultraviolet curable resin and have a relatively low force to harden the surface of the ultraviolet curable resin. Light in the strong UV-C region.

Contents of the invention

In the above-mentioned prior art 1, although a single lamp tube can simultaneously obtain light in the UV-A region and UV-C region, the illuminance of light with a wavelength of 320-340 nm cannot be increased. In order to increase the illuminance in this wavelength range, it is necessary to increase the number of lamps accordingly, which has a problem of increasing the manufacturing cost.

The first object of the present invention is to provide an ultraviolet discharge lamp capable of increasing illuminance by coating a specific phosphor for ultraviolet light emitting in a short-wavelength region in a hot-cathode low-pressure mercury lamp formed of a soda-lime glass light-emitting tube. .

A second object of the present invention is to provide an ultraviolet discharge lamp capable of improving ultraviolet irradiation efficiency by combining an appropriate film thickness of LaPo ₄ :Ce used as a phosphor for ultraviolet irradiation and an arc tube that transmits a specific wavelength.

Description of drawings

Fig. 1 is a configuration diagram showing a part of an embodiment of an ultraviolet discharge lamp of the present invention.

Fig. 2 is a cross-sectional view of line I-I' of Fig. 1 .

Fig. 3 is a schematic diagram illustrating the ultraviolet transmittance of general soda glass.

Fig. 4 is a schematic diagram illustrating the emission distribution of the phosphor used in the present invention.

Fig. 5 is a schematic diagram illustrating the effect of the present invention.

Fig. 6 is a schematic diagram illustrating the comparison of illuminance at different positions of the present invention and the conventional lamp.

Fig. 7 is a schematic diagram illustrating a comparison between the present invention and the conventional illuminance.

Fig. 8 is a schematic diagram illustrating another embodiment of the ultraviolet discharge lamp of the present invention.

Detailed ways

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 and Fig. 2 are for explaining an embodiment of the ultraviolet discharge lamp of the present invention, Fig. 1 is a structural diagram, Fig. 2 is a cross-sectional view of line I-I' of Fig. 1. In addition, FIG. 1 shows a partial configuration of a hot-cathode low-pressure mercury lamp as an example of an ultraviolet discharge lamp in a partially cutaway state.

In FIGS. 1 and 2 , 11 is an inexpensive transparent glass luminous tube made of soda lime glass that can obtain a transmittance of 80% or more at a wavelength of 320 to 340 nm and contains 10% or more of Na ₂ O. The transmittance of an arc tube using soda lime glass is shown in Fig. 3, and a transmittance of 80% or more is obtained for wavelengths above 340 nm.

The tube diameter D of the luminescent tube 11 is 38 mm, the tube length L is 2367 mm, and electrodes 121 and 122 are provided at both ends. These electrodes 121 , 122 support the coiled tungsten wire 14 via conductive wires 131 , 132 . The wires 131 and 132 penetrate the glass press package 15 . The wires 131, 132 are connected to the needle contacts 171, 172 on the lamp caps 161, 162, which are respectively fixed on opposite ends of the lamp.

Furthermore, a rare gas such as argon (Ar) and a certain amount of mercury are sealed in the arc tube 11 at a low pressure of about 1 to 10 Torr. Further, the inner surface of the arc tube 11 is coated with an ultraviolet light-emitting phosphor 18 having a conversion efficiency peak as shown in FIG. 4 , that is, a peak appears between 300 and 340 nm.

As such phosphor 18 , for example, NP-806 manufactured by Nichia Chemical Industry Co., Ltd. can be considered. The phosphor has LaPO ₄ (lanthanum phosphate):Ce (cerium) as its constituents. By supplying electric power from the electrodes 121 and 122 to the hot-cathode low-pressure mercury lamp configured as described above, the spectral distribution characteristic shown in FIG. 5 can be ensured. In this spectral distribution, it can be seen that the illuminance at 320 to 340 nm is further increased based on the emission characteristics of the ultraviolet light emitting phosphor 18 .

What Fig. 6 illustrates is the case of using the phosphor of the present invention and the case of using different existing phosphors A and B, in the central part (a) and the package side (c) of the ultraviolet discharge lamp and (a) and The middle part (b) of (c) compares the result when measuring the illuminance of wavelength 320-340nm.

In addition, FIG. 7 illustrates the comparison results of illuminance between the case of using the phosphor of the present invention and the case of using different phosphors A and B in the prior art.

The phosphor of the present invention is as described above, with LaPO ₄ : Ce as its component, the phosphor A in the prior art is made of YPO ₄ : Ce as its component, and the existing phosphor B is composed of Ce(BaMgSr)Al ₁₁ O ₁₉ as its component.

When the composition is LaPO ₄ :Ce, the average illuminance of lamp positions (a) to (c) is 0.457 (mW/cm ² ), and if the average illuminance is taken as 100%, then the average illuminance of phosphor A It was 72.70%, and the average illuminance of phosphor B was 44.67%.

Therefore, when a hot-cathode low-pressure mercury lamp composed of an inexpensive transparent glass luminous tube made of soda lime glass containing 10% or more of Na ₂ O is coated with a phosphor composed of LaPO ₄ :Ce, the In the case of applying the phosphor B, the illuminance can be increased by 55%, which is nearly 30% higher than that in the case of applying the phosphor A.

In this example, by coating the inner wall of a light-emitting tube made of cheap soda lime glass containing more than 10% _Na2O with a fluorescent substance for ultraviolet light, the illuminance at 320-340 nm can be increased by at least 30% compared with the previous one. degree. Since the illuminance at 320 to 340 nm is increased, ultraviolet rays can be irradiated to a liquid crystal panel in which a liquid crystal material and an ultraviolet reactive material that polymerizes by reacting with ultraviolet rays are mixed and sealed, and the ultraviolet reactive material can be efficiently polymerized.

In addition, since the number of lamps is reduced to achieve the same illuminance due to the improvement of illuminance, it can contribute to power saving.

In this embodiment, a general ultraviolet-emitting hot cathode lamp can be used to realize an ultraviolet lamp capable of emitting light at a wavelength of 320-340 nm with high efficiency. Also, there is no extremely short-wavelength irradiation, so that for a liquid crystal panel that is mixed or sealed with a liquid crystal material and an ultraviolet reactive material, its liquid crystal material will not be destroyed by the ultraviolet light irradiated by the ultraviolet discharge lamp of the present invention, and can be efficiently polymerized UV reactive material.

Fig. 8 is a schematic diagram illustrating another embodiment of the ultraviolet discharge lamp of the present invention. In this embodiment, the film thickness of the phosphor is changed. FIG. 8 illustrates the relationship of relative illuminance when the film thickness of the phosphor 18 is changed.

Here, the relative illuminance (%) when the film thickness of the phosphor 18 is changed between 1 and 49 μm is measured by using a hot cathode low-pressure mercury lamp whose luminous length is 2382.8 ± 2.4 mm and the inner diameter of the arc tube 11 is 38 ± 1.5 mm ( around 320nm).

As shown in FIG. 8 , when the film thickness of the phosphor 18 is in the range of 5 to 40 μm, approximately 90% or more of the current contrast illuminance can be obtained. Therefore, when the composition of the phosphor 18 used is LaPO ₄ :Ce, and the film thickness is 5-40 μm, a hot-cathode low-pressure mercury lamp capable of obtaining high-efficiency illuminance can be realized.

In this embodiment, by using the phosphor 18 whose composition is LaPO ₄ :Ce, and making the film thickness of the phosphor 18 in the range of 5-40 μm, the illuminance at a wavelength of 320-340 nm can be increased.

Therefore, the illuminance at a wavelength of 320 to 340 nm can be increased. This effect is achieved: without increasing the number of lamps used to achieve the increased illuminance, lamps with a wavelength of 320-340 nm can be obtained, which helps to reduce production costs.

The particle size of the phosphor 18 is preferably 1 to 5 μm. This is because when the particle size is less than 1 μm, the light transmittance decreases, and if the particle size is larger than 5 μm, there will be mercury attached between the particle sizes inside the luminous tube and it will be easily blackened, resulting in a reduction in the life of the lamp.

In addition, this invention is not limited to the above-mentioned Example. Since it can be manufactured using general ultraviolet-emitting hot cathode lamps, the same lamp can also be applied to the 2500mm required for irradiation of large-sized panels such as next-generation liquid crystal substrates.

Claims (3)

1. a ultraviolet discharge lamp is characterized in that, comprising:

The clear glass luminous tube;

The startup of enclosing in the described luminous tube uses inert gas and mercury as enclosing thing;

Be oppositely arranged on the pair of discharge electrodes in the described luminous tube;

Fluorophor, it is coated in described luminous tube inwall, conversion mercury frequency spectrum 253.7nm, the peak value that has conversion efficiency at 300～340nm wavelength,

Described luminous tube is made by the soda lime glass that contains the sodium oxide molybdena more than 10% in the 100% mother metal matter.

2. a ultra-violet lamp is characterized in that, comprising:

The luminous tube of making by the soda lime glass of ultraviolet infiltration type;

The startup of enclosing in the described luminous tube uses inert gas and mercury as enclosing thing;

Be oppositely arranged on the pair of electrodes in the described luminous tube;

With LaPO ₄: Ce is the fluorophor that fertile material is formed on described luminous tube inner surface,

The thickness of described fluorophor is 5～40 μ m.

3. ultraviolet discharge lamp as claimed in claim 1 is characterized in that, the particle diameter of described fluorophor is 1～5 μ m.

Images