JPH0528966A - Incandescent lamp light color fluorscent lamp - Google Patents

Abstract

PURPOSE:To improve an average color rendering index Ra and create a more natural visibility in the skin color and the surroundering atmosphere. CONSTITUTION:A mixed phosphor of a blue phosphor made up of strontium activated by bivalent europium, calcium, barium and chloroapatite and a bluish green phosphor made up of strontium aluminate activated by bivalent europium and a green phosphor made up of cerium and lanthanum phosphate activated by terbium and a red phosphor made up of yttrium activated by trivalent europium is applied to the internal face of a glass tube. The relations between the ratio (a) of the blue phosphor and the ratio (b) of the bluish green phosphor to both the blue phosphor and the bluish green phosphor in the mixed phosphor are set to 0.7>=a>0.1 and 0.3<=b<=0.9, and the correlated color temperature is set within the range of 2950-3150K.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric bulb color fluorescent lamp having improved color rendering properties.

[0002]

2. Description of the Related Art Conventionally, fluorescent lamps of this type are straight tube type,
In addition to general lighting such as round tube type, it is rapidly adopted for compact fluorescent lamps such as bulb-type fluorescent lamps and U-shaped fluorescent lamps, and its applications are expanding. The correlative color temperature of these fluorescent light bulb color lamps is 2700K to 31
The one of 50K is adopted.

This incandescent fluorescent lamp generally has a terbium or cerium or terbium activated green phosphor having an emission peak wavelength of 530 to 560 nm and a trivalent europium activated yttrium oxide red fluorescence having an emission peak wavelength of 600 to 630 nm. Of the two-component system mixed phosphor with the body, and the two-component system mixed phosphor having an emission peak wavelength of 440 to 460 nm and a full width at half maximum of 30 to 70.
3 added with a divalent europium-activated blue phosphor of nm
Those using a component-based mixed phosphor are known.

[0004]

However, the above-mentioned conventional light bulb color fluorescent lamp has an average color rendering index (hereinafter referred to as Ra) of 82 to 84. In addition, when observing the skin color and the surrounding atmosphere while the lamp is lit, the overall yellowish tint gives a psychologically unpleasant impression, and there is a problem in using it as a fluorescent lamp for general lighting.

Further, a divalent europium-activated strontium aluminate phosphor having an emission peak at 470 to 500 nm and a half width of 65 nm, and an emission peak wavelength of 530 to 5
Terbium or cerium at 60 nm and a terbium-activated green phosphor with an emission peak wavelength of 600 to 630
A fluorescent lamp using a ternary mixed phosphor with a red phosphor of trivalent europium-activated yttrium oxide at nm has been proposed (Japanese Patent Laid-Open No. 64-12455). The spectral distribution is shown in FIG. In this lamp, Ra is improved to 85, but there is a problem that it cannot be further improved.

The present invention has been made to solve the above problems, and provides a light bulb color fluorescent lamp which improves Ra and makes the skin color and the surrounding atmosphere look more natural.

[0007]

The incandescent fluorescent lamp of the present invention has a peak emission wavelength of 440 to 460 nm and a bivalent europium-activated blue phosphor having a half width of 30 to 70 nm and a peak emission wavelength of A divalent europium activated blue-green phosphor having a half width of 50 to 70 nm, a terbium or cerium terbium activated green phosphor having an emission peak wavelength of 530 to 560 nm, and an emission peak wavelength of 600. A mixed phosphor with a trivalent europium-activated red phosphor having a wavelength of up to 630 nm is applied to the inner surface of the glass tube, and the blue phosphor occupies the blue phosphor and the blue-green phosphor of the mixed phosphor. Where a is the ratio and b is the ratio of the blue-green phosphor to the blue-green phosphor and the blue-green phosphor, 0.7 ≧ a ≧ 0.1 0.3 ≦ b ≦ 0.9 That has a relationship, and the correlated color temperature is 2950 to 3150
It has a configuration in the range of K.

[0008]

In the fluorescent lamp having the above structure, a four-component system mixed fluorescence obtained by adding a blue-green phosphor having an emission peak wavelength of 470 to 500 nm to a divalent europium activated blue phosphor having an emission peak wavelength of 440 to 460 nm. R by using the body
a can be improved.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

The phosphor used is at least one of a divalent europium-activated strontium-calcium-barium-chloroapatite phosphor and a divalent europium-activated barium-aluminate-magnesium phosphor as a blue phosphor, and a divalent blue-green phosphor. Europium activated strontium aluminate phosphor, cerium as green phosphor
A terbium activated lanthanum phosphate phosphor and a trivalent europium activated yttrium oxide phosphor as a red phosphor. As the light bulb color fluorescent lamp, a straight tube type 40 watt fluorescent lamp was manufactured by a usual method using a four-component phosphor mixture in which the ratio of the blue phosphor and the blue-green phosphor was variously changed.

In FIG. 3, the ratio of the blue phosphor in the blue phosphor (divalent europium-activated barium magnesium aluminate phosphor) and the blue-green phosphor (divalent europium-activated strontium aluminate phosphor) is a. , Where b is the ratio of blue-green phosphors to blue phosphors and blue-green phosphors, and a / b is the horizontal axis, and Ra is the vertical axis with correlated color temperature as a parameter. ..
In FIG. 3, a curve 1 is an Ra characteristic when the correlated color temperature is 2800K, a curve 2 is an Ra characteristic when the correlated color temperature is 2950K, and a curve 3 is an R characteristic when the correlated color temperature is 3150K.
a characteristic is shown.

Further, in FIG. 4, the ratio between the divalent europium-activated strontium-calcium-barium-chloroapatite phosphor and the divalent europium-activated strontium aluminate phosphor is plotted on the abscissa, and Ra is used as a parameter with the correlated color temperature as a parameter. A relational diagram when taken on the vertical axis is shown. In FIG. 4, the curve 4 is Ra when the correlated color temperature is 2800K.
The characteristic, curve 5 shows the Ra characteristic when the correlated color temperature is 2950K, and curve 6 shows the Ra characteristic when the correlated color temperature is 3150K.

Ra increases as the mixing ratio of the blue-green phosphor to the blue phosphor in the curves 1 to 6 shown in FIGS. 3 and 4 increases, and reaches a peak at 87 to 88. However, in the case of only the blue-green phosphor, Ra decreased to 85. The blue phosphor A among the mixed phosphors
When the ratio of the blue phosphor A to the blue-green phosphor B is a and the ratio of the blue-green phosphor B to the blue phosphor A and the blue-green phosphor B is b,
By selecting 0.7 ≧ a ≧ 0.1 and 0.3 ≦ b ≦ 0.9, it was found that Ra is improved as compared with the conventional compact fluorescent lamp.

Next, the fluorescent lamps were turned on for each of the correlated color temperature and the deviation from the black body locus (deviation amount: duv), and the visual evaluation was performed by dividing the degree of yellowness, whiteness and brightness into three levels. The results are shown in Table 1.

[0015]

[Table 1]

As is clear from Table 1, the yellow tint is not felt when it is on the negative side of the black body locus. Also,
The whiteness and the brightness were stronger as the color temperature was higher, and were more noticeable when the correlated color temperature was 2950K or higher. Here, in the JIS chromaticity classification, the color temperature range of the bulb color is 2600 to 3150K. When the above results are summed up, the preferable range of the light color of the fluorescent lamp of the electric bulb color that eliminates the yellowish color and has a feeling of white and brightness is 2950 to
It was found to be 3150K. In this range, it was confirmed that the skin color and the surrounding atmosphere feel more natural.

Next, specific examples of the present invention will be described. Divalent europium-activated barium aluminate / magnesium phosphor 4.0% by weight Divalent europium-activated strontium aluminate phosphor 4.0% by weight Cerium / terbium-activated lanthanum phosphate phosphor 28.0% by weight Trivalent europium Activated yttrium oxide phosphor 64.0% by weight A light bulb color fluorescent lamp having this phosphor composition has a correlated color temperature of 3050K, a deviation amount of -1 duv, and an Ra of 88,
The spectral distribution at this time is shown in FIG.

In the above embodiment, the case where the cerium / terbium-activated lanthanum phosphate phosphor is used as the green phosphor has been described. However, cerium / terbium-activated gadolinium borate phosphor, terbium-activated cerium aluminate / phosphor. The same effect can be obtained even when the magnesium phosphor is used.

[0019]

As described above, the present invention can provide a light bulb color fluorescent lamp which can improve Ra and can make the skin color and the surrounding atmosphere look more natural. Is.

[Brief description of drawings]

FIG. 1 is a spectral distribution diagram of an incandescent fluorescent lamp according to an embodiment of the present invention.

FIG. 2 is a spectral distribution diagram of a compact fluorescent lamp of Japanese Patent Laid-Open No. 64-12455.

FIG. 3 is a relational diagram of Ra with respect to the ratio between the divalent europium-activated barium-magnesium aluminate phosphor and the divalent europium-activated strontium aluminate phosphor.

FIG. 4 is a relational diagram of Ra with respect to the ratio of the divalent europium-activated strontium-calcium-vaarium-chloroapatite phosphor and the divalent europium-activated strontium aluminate phosphor.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toyoichi Amano 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd.

Claims (1)

Claims: 1. A divalent europium-activated blue phosphor having an emission peak wavelength of 440 to 460 nm and a half width of 30 to 70 nm; and an emission peak wavelength of 470 to 500 nm. Bivalent europium-activated blue-green phosphor having a value width of 50 to 70 nm, terbium or cerium-terbium activated green phosphor having an emission peak wavelength of 530 to 560 nm, and trivalent europium having an emission peak wavelength of 600 to 630 nm A mixed phosphor with an activated red phosphor is coated on the inner surface of the glass tube, and the ratio of the blue phosphor to the blue phosphor and the blue-green phosphor among the mixed phosphor is set to a, Assuming that the ratio of the blue-green phosphor and the blue-green phosphor in the blue-green phosphor is b, there is a relationship of 0.7 ≧ a ≧ 0.1 0.3 ≦ b ≦ 0.9, and a correlation The temperature is 2950 to 3150
Light bulb color fluorescent lamp characterized by being in the range of K.