JPH0636746A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To show exhibited objects more beautifully by adding a bluish green region and a deep red region, and mixing phosphors having emission spectrum. CONSTITUTION:A light emitting layer 3 mixed with multiple phosphors is formed on the inner face of a glass bulb 2 to constitute a fluorescent lamp 1. Phosphors having emission spectrum are mixed with a blue region, a green region, and a red region, a bluish green region and a deep red region are added, and phosphors having emission spectrum are mixed with them to form the layer 3 so that the chromaticity point exists in the range of -0.005 through -0.015DUV from a black body locus. The phosphors having the emission spectrum in the added bluish green region are made of europium inactive boron strontium phosphate phosphors, and the phosphors having the emission spectrum in the deep red region are made of manganese inactive germanium acid magnesium fluoride phosphors respectively. The chromaticity point is set within the preset range from the black body locus, and exhibited commodities can be shown more beautifully.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly to a fluorescent lamp in which a light emitting layer formed on the inner surface of a glass bulb is composed of a plurality of phosphors.

[0002]

2. Description of the Related Art A conventional fluorescent lamp of this type is constructed, for example, by forming a light emitting layer on the inner surface of a glass bulb and providing a pair of electrodes on both ends of the glass bulb.

Specifically, the light-emitting layer is a europium-activated barium-magnesium aluminate phosphor as a phosphor having an emission spectrum in the blue region and a cerium-terbium-activated phosphor as a phosphor having an emission spectrum in the green region. A lanthanum phosphate phosphor and a europium-activated yttrium oxide phosphor as a phosphor having an emission spectrum in the red region are mixed at 17%, 40%, and 43%, respectively.

This fluorescent lamp has a high average color rendering index and is used as a light source for displaying products such as vegetables and meat in cases, and it can be expected that the color of the displayed product will be clear.

[0005]

However, when an exhibit is illuminated with this fluorescent lamp, it may not be possible to show the exhibit neatly even though the average color rendering index is high.

This is because, as disclosed in "Color Science Handbook", page 494, edited by the Japan Color Society, the color of an actual exhibit is different from the color memorized by humans. It seems to be.

[0007] Therefore, even if the same vegetables are bluish,
Or, if it is reddish, it may not look beautiful depending on the image of the viewer,
There is a problem that the sales of products are not completed because the purchase will not be motivated.

Therefore, it is an object of the present invention to provide a blue-green region,
Another object of the present invention is to provide a fluorescent lamp that can make an exhibit look even more beautiful by adding a phosphor having an emission spectrum in the deep red region.

[0009]

Therefore, in order to achieve the above-mentioned object, the present invention provides a fluorescent lamp having a light emitting layer formed by mixing a plurality of phosphors on the inner surface of a glass bulb. The chromaticity point is -0.00 from the black body locus.
The present invention is formed by mixing phosphors having an emission spectrum in a blue region, a green region, and a red region so as to exist in a range of 5 to -0.015 DUV. , Blue-green area, green area, red area,
The third invention is formed by mixing phosphors having an emission spectrum in the deep red region. Further, in the third invention, the phosphor having an emission spectrum in the blue region is a europium-activated barium aluminate. -Magnesium phosphor, a phosphor having an emission spectrum in the blue-green region is europium-activated strontium borate phosphor, and a phosphor having an emission spectrum in the green region is cerium-terbium-activated lanthanum phosphate phosphor, a red region The phosphor having an emission spectrum in (1) is a europium-activated yttrium oxide phosphor, and the phosphor having an emission spectrum in the deep red region is a manganese-activated magnesium germanium fluoride phosphor.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of the present invention will be described with reference to FIG.

In the figure, 1 is a fluorescent lamp,
A glass bulb 2 and a light emitting layer 3 formed on the inner surface thereof;
It is composed of a pair of electrodes provided at both ends of the glass bulb 2. In particular, in the light-emitting layer 3, a phosphor having an emission spectrum in the blue region is a europium-activated barium-magnesium aluminate phosphor (Ba.Mg ₂ Al ₁₆ O ₂₇₎ :
Eu), a phosphor having an emission spectrum in the blue-green region is a europium-activated strontium borate phosphor (Sr
O · P ₂ O ₅ · B ₂ O ₃ : Eu), a phosphor having an emission spectrum in the green region is a cerium / terbium-activated lanthanum phosphate phosphor (LaPO ₄ : Ce, Tb), and an emission spectrum in the red region. The phosphor has a europium-activated yttrium oxide phosphor (Y ₂ O ₃ : Eu), and the phosphor having an emission spectrum in the deep red region is a manganese-activated magnesium germanium fluoride phosphor (3.5Mg0.03).
5MgF ₂ · GeO ₂ : Mn), respectively.

In the fluorescent lamp having the above structure, a fluorescent lamp in which the mixing ratio of various phosphors was changed as shown in Table 1 was used as a light source, and the appearance of an object was visually evaluated to obtain the results shown in Table 2. .

[0013]

[Table 1]

[0014]

[Table 2]

The visual evaluation of the appearance of the exhibit was conducted by using the fluorescent lamps NO1 to NO5 shown in Table 1 as a light source.
The fluorescent lamp of No. 5 looked nice, but the fluorescent lamp of NO5 was not so good. The evaluation is "○"
..Beautiful looking and excellent, "△" ・ ・ Normal, "×"
..It was divided into three stages, that it does not look beautiful.

As is clear from the above table, when the chromaticity point is within the range of -0.005 to 0.015 DUV from the black body locus, excellent visual recognition effect is obtained.

[0017]

As described above, according to the present invention, phosphors in the blue-green region and deep red region are further added to the phosphors in the three wavelength regions, and the chromaticity point is within a predetermined range from the blackbody locus. By setting to, it is possible to make the displayed product look more beautiful and to effectively stimulate the purchase will of the product.

[Brief description of drawings]

FIG. 1 is a partially cutaway side view showing an embodiment of the present invention.

Claims (3)

[Claims] 1. In a fluorescent lamp having a light emitting layer formed by mixing a plurality of phosphors on the inner surface of a glass bulb, the light emitting layer has a chromaticity point of −0.005 to −0.
A fluorescent lamp characterized by being formed by mixing phosphors having an emission spectrum in a blue region, a green region and a red region so as to exist in a range of 015DUV. 2. The light emitting layer comprises a blue region, a blue green region,
The fluorescent lamp according to claim 1, wherein the fluorescent lamp is formed by mixing phosphors having an emission spectrum in a green region, a red region and a deep red region. 3. In the light emitting layer, the phosphor having an emission spectrum in the blue region is a europium-activated barium-magnesium aluminate phosphor, and the phosphor having an emission spectrum in the blue-green region is a europium-activated boron. Strontium phosphate phosphor, phosphor having an emission spectrum in the green region is a cerium / terbium-activated lanthanum phosphate phosphor, phosphor having an emission spectrum in the red region is a europium-activated yttrium oxide phosphor, in the deep red region 2. The fluorescent lamp according to claim 1, wherein each of the phosphors having an emission spectrum is composed of a manganese-activated magnesium germanate fluoride phosphor.