JP2000243352A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp faithfully reproducing the color of an object, improving appearance of the color and having a light color free from glare and does not give a sense of incompatibility when jointly used with an incandescent lamp. SOLUTION: A fluorescent lamp has a phosphor layer composed of a mixed phosphor having a light emitting peak in each of five wavelength areas, and the light color falls within a range of respective ellipses of an ellipse having a light color of CIE 1960 uv in a chromaticity diagram, the major axis of 0.056, the minor axis of 0.024 with a chromaticity point (0.224, 0.330) as the center and an inclination from (u) axis of 20 degrees, an ellipse having the major axis of 0.078, the minor axis of 0.014 with the chromaticity point (0.224, 0.330) as the center and an inclination from the (u) axis of 30 degrees, an ellipses having the major axis of 0.060, the minor axis of 0.030 with a chromaticity point (0.235, 0.335) as the center and an inclination from the (u) axis of 30 degrees and an ellipse having the major axis of 0.060, the minor axis of 0.018 with a chromaticity point (0.225, 0.330) as the center and an inclination from the (u) axis of 20 degrees, and a correlative color temperature is not more than 3500 K.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fluorescent lamp.

[0002]

2. Description of the Related Art At present, a method of quantitatively evaluating the quality of color appearance by various light sources by a color rendering index has been established. This quantitatively evaluates how faithfully the target light reproduces color compared to the reference light. Recently, attention has been paid to the preference of color appearance together with fidelity, and it is desirable to illuminate the colors of human skin and the colors that exist in living spaces such as food, plants, interior decoration, and clothing. Is becoming an important point.

[0003]

At present, in the field of house and store lighting, the correlated color temperature is from about 5000K to about 70K.
General illumination lamps having a relatively high color temperature of up to 00K are often used as main illumination. However, it is said that lighting with a low color temperature lamp of 2800 to 4500K is more suitable than lighting with a high color temperature lamp to make the illuminated space a calm atmosphere. For these reasons, in recent years, the use of low color temperature light sources has been increasing gradually but yearly in the field of house and store lighting.

[0004] In addition, there is a problem that a lamp having a high color temperature feels brighter than a lamp having a low color temperature when the light source is directly viewed. Furthermore, in recent years, there has been an increase in the use of incandescent bulb downlights together with the main lighting lamp as a method of housing and store lighting.However, when a high color temperature lamp is used as the main lighting, the light color with the incandescent bulb is increased. There is also a problem that a sense of incongruity is caused by the difference between the two. Therefore, there are many cases where the use of a lamp with a low color temperature is suitable from the above viewpoint.

As described above, the lamp in the low color temperature region has the features and advantages such as being suitable for producing a calm atmosphere, but the conventional lamp in the low color temperature region having a correlated color temperature of 3700K or less. Is considered to have a problem with the actual appearance of color. There were problems with the favorable appearance of the color, such as the light yellowishness was strong and the Japanese flesh color was poor, and the new tatami mats were yellowish and looked like old tatami mats. There is also a problem that white materials such as newspapers and white shirts do not look white, that is, have a poor white appearance. In addition, conventional lamps in a low color temperature range have poor color appearance, so there is also a problem with color identification,
It is said that it is difficult to distinguish similar colors compared to other light colors.

The present invention has been made to solve the above problems, and a combination of light emission in five wavelength ranges is a light color that faithfully reproduces the color of an illuminated object of main light emission,
Low color that has the characteristic that it is easy to distinguish similar colors or that white objects look white (excellent whiteness), and also has the characteristic that it is hard to feel uncomfortable when used in combination with the glare of the light source and incandescent bulbs It is an object of the present invention to provide a fluorescent lamp in a temperature range.

[0007]

According to a first aspect of the present invention, there is provided a fluorescent lamp having a phosphor having an emission peak at a wavelength of 400 to 470 nm, a phosphor having an emission peak at a wavelength of 470 to 535 nm, and a phosphor having a wavelength of 540. A phosphor layer composed of a mixed phosphor mainly composed of a phosphor having an emission peak at ~ 550 nm, a phosphor having an emission peak at a wavelength of 600-615 nm, and a phosphor having an emission peak at a wavelength of 615-670 nm. A fluorescent lamp formed on an inner surface of a glass tube, wherein a chromaticity point of light color is CIE196.
On the 0uv chromaticity diagram, the chromaticity point (u, v) = (0.224,
0.330), the major axis is in the range of an ellipse of 0.056, the minor axis is 0.024, the inclination from the u axis is 20 degrees, and the chromaticity point (u, v) = (0 .224,0.
330) and the major axis is 0.078 and the minor axis is 0.0
At 14, the chromaticity point (u, v) = (0.235, 0.33) is within the range of the ellipse whose inclination from the u axis is 30 degrees.
5) The major axis is 0.060 and the minor axis is 0.030 centered on 5).
Is within the range of the ellipse whose inclination from the u axis is 30 degrees,
And within a range of an ellipse having a major axis of 0.060, a minor axis of 0.018, and an inclination of 20 degrees from the u axis centering on the chromaticity point (u, v) = (0.225, 0.330). And the correlated color temperature is in a range on a lower color temperature side than the isochromatic temperature line of 3500K.

The fluorescent lamp faithfully reproduces the color of the illuminated object, and is excellent in color discrimination (identification).
It is difficult to feel the glare caused by the illumination, and the wavelength is 400-4.
70 nm, 470-535 nm, 540-550 nm,
A fluorescent lamp in a low color temperature region mainly comprising a combination of light emission of 600 to 615 nm and 615 to 670 nm can be obtained.

A blue region having a wavelength of 400 to 470 nm, a green region having a wavelength of 540 to 550 nm, and a wavelength of 600 to 615 n
m of three types of light emission in the red region, wavelength 470-535n
m in blue-green to green region, wavelength 615 to 670 nm
By combining the light emission in the deep red region, the color of the illuminated object can be faithfully reproduced.

[0010] The fluorescent lamp according to claim 2 of the present invention comprises:
A phosphor having an emission peak at a wavelength of 400 to 470 nm, a phosphor having an emission peak at a wavelength of 470 to 535 nm, a phosphor having an emission peak at a wavelength of 540 to 550 nm, and a phosphor having an emission peak at a wavelength of 600 to 615 nm And a phosphor layer composed of a mixed phosphor containing a phosphor having an emission peak at a wavelength of 615 to 670 nm as a main component, formed on the inner surface of the glass tube, and having a chromaticity of light color. The point is on the CIE 1960uv chromaticity diagram, and the chromaticity point (u, v) is (0.235, 0.34
2), (0.252, 0.345), (0.248,
0.338) and (0.239, 0.334).

A fluorescent lamp which faithfully reproduces the color of an illuminated object, which makes an illuminated white object feel white (excellent whiteness), and which makes it difficult to perceive the glare caused by illumination. 400-470 nm, 470-5
35 nm, 540-550 nm, 600-615 nm,
A fluorescent lamp in a low color temperature region mainly comprising a combination of light emission of 615 to 670 nm can be obtained.

According to a third aspect of the present invention, in the fluorescent lamp according to the first or second aspect, the chromaticity point of the light color has a correlated color temperature of 3400K on the CIE1960uv chromaticity diagram. It has a configuration that is within the range on the lower color temperature side than the color temperature line.

According to the present invention, in addition to the effects obtained in the first and second aspects, there is obtained a good effect that when used together with the incandescent lamp, it is difficult for the user to feel uncomfortable due to the light color difference of the light source.

According to a fourth aspect of the present invention, there is provided a fluorescent lamp according to any one of the first to third aspects,
The chromaticity point of light color is (u,
v) = (0.2457, 0.3403) as a center and within a circle having a radius of 0.003.

This is a fluorescent lamp that faithfully reproduces the color of the illuminated object, and is excellent in color discrimination and whiteness.
And a wavelength of 400 to 470 nm, 47, which can more strongly exhibit an effect of making it difficult to feel unnaturalness due to the light color difference of the light source when used simultaneously with the glare caused by illumination or an incandescent light bulb.
0 to 535 nm, 540 to 550 nm, 600 to 615
Thus, a fluorescent lamp in a low color temperature region mainly comprising a combination of light emission of 615 nm to 670 nm can be obtained.

According to a fifth aspect of the present invention, there is provided a fluorescent lamp according to any one of the first to fourth aspects,
The phosphor having an emission peak at a wavelength of 400 to 470 nm is made of at least one kind of a divalent europium-activated blue phosphor, and the phosphor having an emission peak at a wavelength of 470 to 500 nm is a divalent europium-activated blue-green phosphor. At least one of the wavelengths 500 to 535 n
The phosphor having an emission peak at m comprises at least one of divalent manganese-activated or divalent europium and divalent manganese-activated green phosphor, and the wavelength 540 to 550 n
a phosphor having an emission peak at m is activated by trivalent terbium;
Alternatively, it is composed of at least one of trivalent cerium and trivalent terbium activated green phosphors, and has a wavelength of 600 to 615.
The phosphor having an emission peak at nm comprises at least one of trivalent europium-activated red phosphors,
The phosphor having an emission peak at 15 to 670 nm has at least one of trivalent europium activated, divalent manganese activated and tetravalent manganese activated red phosphors.

By using these phosphor materials,
Wavelengths of 400 to 470 nm, 470 to 535 nm, and 5 wherein the effect according to any one of claims 1 to 4 is obtained.
40-550 nm, 600-615 nm, 615-67
A fluorescent lamp in a low color temperature region mainly comprising a combination of light emission of 0 nm can be obtained.

[0018]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Experiments for investigating the relationship between the light emitted from a light source and the appearance of the color of a color object in a low color temperature range will be sequentially described.

First, an experiment was carried out on color discrimination (identification) of colors frequently used in a house under lamps having different light colors of light sources. In experiments, black and dark blue, red, blue,
The recognizability of green and the like was determined by a method in which the color difference was varied and the color difference of the target color chart was determined by the subject.

FIG. 2 shows the results of an experiment on the easiness of distinguishing black and dark blue, where the light color of the light source is the chromaticity point (u, v) = (0.224, 0.330) on the CIE1960uv chromaticity diagram. If the center is within an ellipse having a major axis of 0.056, a minor axis of 0.024, and an inclination of 20 degrees from the u axis, 75% or more of the subjects have a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space. It became clear that the colors could be distinguished.

FIG. 3 shows the results of an experiment on the recognizability of red. The light color of the light source is centered on the chromaticity point (u, v) = (0.224, 0.330) on the CIE1960uv chromaticity diagram. The major axis is 0.060, the minor axis is 0.018, and u
75 if it is within the range of the ellipse whose inclination from the axis is 20 degrees
% Or more subjects were able to distinguish colors with a color difference of 2 or more in the CIE1976 L ^* a ^* b ^* color space.

FIG. 4 shows the results of an experiment on how easily blue can be recognized. The light color of the light source is represented by the chromaticity point (u, v) = (0.235, 0.335) on the CIE1960uv chromaticity diagram.
With the major axis at 0.060 and the minor axis at 0.030,
If it is within the range of the ellipse whose inclination from the u axis is 30 degrees,
It was found that 75% or more of the subjects could distinguish colors having a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

FIG. 5 shows the results of an experiment on the easiness of distinguishing green, where the light color of the light source is chromaticity point (u, v) = (0.225, 0.330) on the CIE1960uv chromaticity diagram.
If the major axis is within the range of an ellipse whose major axis is 0.060, whose minor axis is 0.018, and whose inclination from the u axis is 20 degrees, 7
It was found that 5% or more of the subjects could distinguish colors having a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

That is, the black and dark blue, red,
It can be concluded that a light source having a light color that is within the range of all four ellipses related to intelligibility such as blue and green is a light source having excellent color discrimination in almost all categories of colors.
The chromaticity ranges within these four ellipses are indicated by oblique lines in FIG.

Next, the correlated color temperature 35 where the light source colors are variously different.
An experiment was conducted on the whiteness perceived when an achromatic visual object was viewed under the conditions illuminated by a lamp in a low color temperature region of 00K or less.

In the experiment, an achromatic color chart with a Munsell value of 9 was shown to the subject under lamps with various light colors of the light source, and the total color and whiteness felt from the color chart was scored as 100 points. And let them answer. The result is C
In the IE1960uv chromaticity diagram, the range of light colors excellent in whiteness is shown by the hatched portions in FIG. FIG. 7 shows a range in which the whiteness answer is 90 points or more, and the chromaticity point (u, u) on the CIE1960uv chromaticity diagram.
v) is (0.235, 0.342), (0.252,
0.345), (0.248, 0.338), (0.2
39, 0.334). Therefore, it was found that a light source having a light source color within this range can recognize a white object as clearly white.

Further, for light colors in a low color temperature region of 3500 K or less, the white feeling at the same correlated color temperature was compared. As a result, the chromaticity point (u, v) on the CIE 1960uv chromaticity diagram with high whiteness is (0.235, 0.342),
(0.252, 0.345), (0.248, 0.33
8) and (0.239, 0.334), the chromaticity deviation from the blackbody locus on the CIE 1960uv chromaticity diagram is −0.007 or more and −0. 0
Those having a value of 03 or less (a minus sign indicates a chromaticity deviation from the blackbody locus to the lower right side in the CIE 1960uv chromaticity diagram) were found to have particularly excellent whiteness.

Another problem is glare of the light source. When the bright light perceives the eyes, not only does it feel unpleasant, but it also makes it impossible to see the surroundings accurately, so we examined the glare of the light source.

As an experiment, an experiment was conducted to clarify how much glare is felt with respect to the light source under the condition that the correlated color temperature of the light color of the light source is variously changed. Experiment 3
The subject was determined to determine the brightness at which the same glare as when looking at a 000K light source was observed.

In this case, the brightness perceived when a light source having a different correlated color temperature was perceived was set to 1, assuming that the luminance at which the glare was perceived when viewing a light source of 3000K was 1. The result is shown in FIG. From this, it became clear that the higher the correlated color temperature (K), the lower the brightness perceived by the glare.

Further, as a result of further analysis, it is found that, when a light source having a correlated color temperature of 3500K or less is observed, the luminance at which a glare is felt and
It became clear that there was no significant difference in the luminance at which the glare was seen when viewing the light source having a correlated color temperature of 3000K at a significance level of 5%. That is, it was found that a light source having a correlated color temperature of 3500 K or less felt almost the same glare as a light source having a correlated color temperature of 3000 K.

Next, when the halogen bulb and the fluorescent lamp having the color temperature of 2800K were simultaneously turned on, the subject was judged to be uncomfortable due to the difference in the light colors of these two light sources.

The subjects "strongly feel the discomfort due to the light color difference", "worry about the discomfort due to the light color difference", "the discomfort due to the light color difference is acceptable", "the discomfort due to the light color difference is acceptable", "light The discomfort due to the light color difference was determined by a method of selecting one category from the five categories of "I do not mind the discomfort due to the color difference at all". FIG. 9 shows the result. From this result, it is clear that the higher the correlated color temperature of the fluorescent lamp, the more the sense of incongruity due to the light color difference is felt. Therefore, if the correlated color temperature of the fluorescent lamp is 3400K or less, it is confirmed that the incongruity due to the light color difference is acceptable. Was.

As a result of comprehensively judging the results of the above visual evaluation tests, it was found that the light source color in the low color temperature region was excellent in color discrimination and whiteness, and when used simultaneously with the glare caused by illumination and incandescent lamps. The most preferable range in which the sense of incongruity due to the light color difference of the light source is hardly felt is that the chromaticity point of the light color is CIE1960.
On the uv chromaticity diagram, (u, v) = (0.2457, 0.3
403) was found to be within the range of a circle having a radius of 0.003 around the center.

The chromaticity ranges having the effects of the present invention are collectively shown in FIG. 1 in the CIE 1960uv chromaticity diagram. In FIG. 1, symbol 1 is a chromaticity range excellent in color discrimination, symbol 2 is a range excellent in whiteness, and symbol 3 is a correlated color temperature 35 which is a boundary at which glare due to illumination is hard to be perceived.
The isochromatic temperature line of 00K, symbol 4 is a correlated color temperature line of 3400K correlated color temperature, which is a boundary where the inconsistency due to the light color difference of the light source is hard to be felt when used simultaneously with the incandescent lamp, and symbol 5 is chromaticity with which a particularly favorable effect is obtained. A point is (u, v) = (0.2457, 0.3403) on the CIE1960uv chromaticity diagram.
A range circle having a radius of 0.003 around the center is shown.

The light source having a low color temperature having a chromaticity point of light color in both the chromaticity range excellent in color discrimination and the range excellent in white sensation described in the present invention is the color discriminating property. Needless to say, it means a low color temperature light source that is excellent in whiteness and excellent in whiteness. Further, since the chromaticity point of the light color of the light source of the present invention is within the range of lower color temperature than the isochromatic temperature line of correlated color temperature of 3500 K, in addition to the effect on color discrimination and whiteness, the glare caused by illumination The effect that it is hard to feel is also obtained. Also,
When the chromaticity point of the light color of the light source is in a range on the lower color temperature side from the isochromatic temperature line of the correlated color temperature of 3400 K, in addition to the effects of color discrimination and whiteness, it is difficult to feel glare caused by illumination. When used simultaneously with the effect and the incandescent light bulb, an effect is obtained in which the sense of incongruity due to the light color difference of the light source is not easily felt.

In FIG. 1, the chromaticity range of the light color of the low color temperature light source having a correlated color temperature of 3500 K or less, in which at least one of the color discrimination property and the white feeling is excellent, is shown by hatching. Within the above range, the correlated color temperature is in the range lower than the 3500K isochromatic temperature line, so that in addition to the effects of color discrimination and whiteness, the effect of making the glare caused by illumination less noticeable is also provided. can get.

Next, the fidelity of color appearance was examined.

In recent years, a three-wavelength band fluorescent lamp has become popular as a fluorescent lamp. This is a fluorescent lamp that emits white light by a combination of blue, green, and red light emission from a high-efficiency phosphor mainly composed of a rare-earth element as the emission center.It is highly efficient because light emission is concentrated in a narrow range. It is widely used in spite of being expensive, because it can reproduce colors faithfully.

As a method for evaluating whether or not colors of various objects can be faithfully reproduced, JISZ 8726-19 is used.
A method using a color rendering index according to 90 are common, in the above general three band fluorescent lamp, an average color rendering index R _a showing the fidelity of the average color reproduction 80
８８88, which is one of the best among light sources.

However, the ability to reproduce the color of the illuminated object more faithfully can be an important point in increasing added value. Therefore, using the color rendering index as an index of the fidelity of color reproduction, a search was made for a light emission spectrum of a lamp capable of further increasing the color rendering index.

As an experiment, a wavelength of 400 to 4 which is a main wavelength of light emission of a conventional general three-band fluorescent lamp is used.
On the basis of three types of light emission: blue light emission of 70 nm, green light emission of 540 to 550 nm wavelength, and red light emission of 600 to 615 nm wavelength, if any other wavelength region is added to the three main light emissions, the average color rendering index Many studies were made to see if _Ra increased, based on computer simulations.

For emission of blue light having a wavelength of 400 to 470 nm, divalent europium-activated barium / calcium / strontium / magnesium chloroapatite phosphor ((BaCaSrMg) ₁₀ (PO ₄ ) ₆ : Eu ²⁺ ); green light having a wavelength of 540 to 550 nm Trivalent cerium
Trivalent terbium-activated lanthanum phosphate phosphor (LaP
O ₄ : Ce ³⁺ , Tb ³⁺ ), a trivalent europium-activated yttrium oxide phosphor (Y ₂ O ₃ : Eu ³⁺ ) for emitting red light with a wavelength of 600 to 615 nm. Temperature 32
00K, CIE1960uv When a straight tube 40W fluorescent lamp having a chromaticity deviation from the locus of black body on the chromaticity diagram of 0 is prepared, if any other wavelength region is added to the above three main light emission regions, the average is obtained. or a computer simulators color rendering index R _a is increased - the results of calculation by Deployment as an example.

[0044] Figure 10 is a graph showing the results of simulation, the peak wavelength of the emission to be added to the horizontal axis, the vertical axis represents the increase in the number [Delta] R _a of the general color rendering index R _a by adding the light emission .

As shown in FIG.
nm blue light emission, wavelength 540-550 nm green light emission,
Three main luminescence of red luminescence of wavelength 600-615nm,
Wavelength 470-535nm or wavelength 615-670n
By adding luminescence with an emission peak at m, it was found to be increased average color rendering index R _a. Moreover, the most effective emission to increase the average color rendering index R _a is 475
It was also found that the light emission had an emission peak near 495 nm.

Subsequently, the special color rendering indexes R ₉ , R ₁₀ ,
R ₁₁ and R ₁₂ are also simulated by the same simulation.
It was calculated whether adding any other wavelength region to the three main emission regions could increase the number of evaluations. The special color rendering evaluation numbers R _{9 to} R ₁₂ are evaluation numbers indicating the fidelity of color reproduction of red, yellow, green, and blue colors having relatively high saturation, and the fidelity of color reproduction together with _Ra . Often used as an indicator of

Blue emission at a wavelength of 400 to 470 nm, green emission at a wavelength of 540 to 550 nm, and a wavelength of 600 to 615 n
FIG. 11 shows changes in the special color rendering indexes R ₉ and R ₁₀ when light emission in other wavelength ranges is added to the three main light emissions of red emission of m, and changes in the special color rendering indexes R ₁₁ and R ₁₂ . As shown in FIG. Similar to the graph of FIG. 10, the horizontal axes of the graphs of FIGS. 11 and 12 indicate the peak wavelength of the light emission to be added, and the vertical axis indicates the number of increase of the special average color rendering index ΔR _i (i = 9 to 12).

From FIGS. 11 and 12, the special color rendering index R₉
~ R₁₂Maximum emission peak wavelength that can increase
The values are 470-535 nm or 615-6.
Within the range of 70 nm, the average color rendering index R_aIncreased
Wavelength 470-535 nm or wavelength
Light emission with an emission peak at 615-670 nm is a special
Color evaluation number R₉~ R₁₂Effective can also increase
It turned out to be light emission. Specifically, the wavelength 470-5
The addition of 35 nm emission is especially useful for special color rendering index R _Ten,
R₁₁, R₁₂Is effective in increasing the wavelength, and the wavelength is 615 to 670.
The addition of luminescence in nm is especially useful for special color rendering index R₉Effective for increasing
It can be read that it is effective.

Therefore, the light emission at wavelengths of 470 to 535 nm and the light emission at wavelengths 615 to 670 nm are combined at an appropriate ratio to obtain blue light emission at wavelengths of 400 to 470 nm and wavelength 540 to 540 nm.
By adding to the three main light emissions of green light emission at 550 nm and red light emission at a wavelength of 600 to 615 nm, it is possible to faithfully reproduce all the main colors red, yellow, green and blue.

That is, according to the calculation by the above simulation, the emission at the wavelength of 470 to 535 nm and the wavelength of 615
-670 nm emission, blue emission of wavelength 400-470 nm, green emission of wavelength 540-550 nm, wavelength 600
It has been found that by obtaining a fluorescent lamp that emits together with the three main emissions of red emission at ６615 nm, the color of the illuminated object can be reproduced more faithfully.

From the above experimental results, the wavelengths of 400 to 470
nm, 470-535 nm, 540-550 nm, 60
Mainly a combination of light emission of 0 to 615 nm and 615 to 670 nm, and by setting the chromaticity point of the light emission within the chromaticity range having the effects of the present invention, the color of the illuminated object can be faithfully reproduced, and A fluorescent lamp in a low color temperature region excellent in color discrimination and white feeling can be obtained.

As described above, in order to realize a fluorescent lamp having the effect of the present invention, a phosphor having a light emission peak at a wavelength of 400 to 470 nm, a phosphor having a light emission peak at a wavelength of 470 to 535 nm, and a phosphor having a light emission peak at a wavelength of 540 to 550 nm A phosphor layer composed of a mixed phosphor mainly composed of a phosphor having an emission peak at 600 nm, a phosphor having an emission peak at 600 to 615 nm, and a phosphor having an emission peak at 615 to 670 nm is placed in a glass tube. A fluorescent lamp which is formed on a surface and whose chromaticity point of the light color is within the chromaticity range in which the effects of the present invention are obtained may be used. By appropriately setting the proportions of the respective phosphors, it is possible to obtain a fluorescent lamp in a low color temperature region that can faithfully reproduce the color of the illuminated object and is excellent in color discrimination and whiteness.

The following can be used as the phosphor used as the phosphor layer of the fluorescent lamp. Wavelength 400 ~
As the phosphor having an emission peak at 470 nm, at least one of divalent europium-activated blue phosphors may be used. As the phosphor having an emission peak at a wavelength of 470 to 535 nm, at least one of divalent europium-activated blue-green phosphor and divalent manganese-activated or divalent europium and divalent manganese-activated green phosphor is used. It may be used. As the phosphor having an emission peak at a wavelength of 540 to 550 nm, at least one of trivalent terbium-activated or trivalent cerium- and trivalent terbium-activated green phosphors may be used. In addition, wavelength 6
As the phosphor having an emission peak at 00 to 615 nm, at least one of trivalent europium-activated red phosphors may be used. As the phosphor having an emission peak at a wavelength of 615 to 670 nm, at least one of trivalent europium activated, divalent manganese activated, and tetravalent manganese activated red phosphors may be used.

Table 1 shows a list of phosphor materials used to realize the present invention described above.

[0055]

[Table 1]

Next, a fluorescent lamp was manufactured using the phosphor materials listed in Table 1, and an actual observation evaluation experiment was performed to confirm the effects of the present invention. Table 2 shows the results.

[0057]

[Table 2]

In Table 2, in order from the left, the produced lamp symbol,
Phosphor type and weight ratio, CIE1960u of manufactured lamp
v chromaticity coordinates, correlated color temperature Tc of the produced lamp, chromaticity deviation Δuv from the blackbody locus on the CIE1960uv chromaticity diagram of the produced lamp (however, plus is CIE1960uv
On the chromaticity diagram, the chromaticity deviation from the blackbody locus to the upper left is indicated, and the minus sign indicates the chromaticity deviation from the blackbody locus to the lower right. ),
Average color rendering index R _a , ease of color discrimination, observation evaluation result of whiteness, observation evaluation result of light source glare, observation evaluation result of uncomfortable feeling with light bulbs, and finally comprehensively focusing on color appearance This shows the overall evaluation of whether the lighting environment is suitable.

The evaluation results of the ease of color discrimination, the observation evaluation result of whiteness, the observation evaluation result of the glare of the light source, the observation evaluation result of uncomfortable feeling with the light bulb, and the comprehensive evaluation are indicated by ◎ (particularly excellent, especially (Preferable), ○ (excellent, preferred), Δ (equivalent to conventional lamp, no superiority), ×
Marked (bad, unfavorable).

Further, the chromaticity points of the light colors of the lamps manufactured and evaluated shown in Table 2 are enlarged on the CIE1960uv chromaticity diagram together with the effective chromaticity range obtained from the experiments described above. FIG. 13 shows the result of the mapping. In the figure, ◎, ○, △, and × indicate the chromaticity point of the light color of the produced lamp in the observation evaluation experiment of Table 2, which is suitable as an illumination environment, considering the color appearance as a whole. This is shown together with the evaluation of whether or not the lamps are formed.

From the above, it was possible to confirm the chromaticity region of the light color in which the effect of the present invention was obtained. Similar results were obtained when other phosphor materials listed in Table 1 were used.

[0062]

As described above, according to the present invention, it is possible to obtain a fluorescent lamp capable of improving color appearance and the like in a low color temperature region. Thus, the present invention is of great industrial value.

[Brief description of the drawings]

FIG. 1 shows a chromaticity range of each light color having an effect of the present invention (a chromaticity range excellent in color discrimination, a chromaticity range excellent in whiteness, a chromaticity range in which glare caused by illumination is hardly perceived, and incandescence. The CIE 1960uv chromaticity diagram comprehensively shows the chromaticity range in which unpleasant sensation due to the light color difference of the light source when used simultaneously with the light bulb, and the chromaticity range in which a particularly preferable effect can be obtained.

FIG. 2 is a diagram showing a chromaticity range of a light source color in a CIE1960uv chromaticity diagram that makes it easy to discriminate between black and navy colors.

FIG. 3 is a diagram illustrating a chromaticity range of a light source color in a CIE1960uv chromaticity diagram in which red is easily distinguishable.

FIG. 4 is a diagram showing a chromaticity range of a light source color in a CIE1960uv chromaticity diagram which makes it easy to distinguish blue.

FIG. 5 is a diagram showing a chromaticity range of a light source color in a CIE1960uv chromaticity diagram in which green is easily discriminated.

FIG. 6 is a diagram showing a chromaticity range of a light source color in which colors of all categories in the CIE1960uv chromaticity diagram are easily distinguishable.

FIG. 7 is a diagram illustrating a chromaticity range of a light source color in which a high whiteness is obtained in a CIE1960uv chromaticity diagram.

FIG. 8 is a diagram showing the relationship between the correlated color temperature of the light source and the brightness of the light source that causes glare.

FIG. 9 is a diagram showing a relationship between a correlated color temperature of a light source and a sense of incongruity due to a light color difference between an incandescent light bulb.

10 is a view showing the relationship between the increase in the number [Delta] R _a of the emission peak wavelength and the average color rendering index R _a to add

FIG. 11 is a diagram showing the relationship between the peak wavelength of light emission to be added and the numbers of increase ΔR ₉ and ΔR ₁₀ of the special color rendering indexes R ₉ and R ₁₀ .

FIG. 12 shows a peak wavelength of light emission to be added and a special color rendering index.
R₁₁, R₁₂Number of increase ΔR₁₁, ΔR ₁₂Diagram showing the relationship

FIG. 13 is a diagram showing chromaticity points of light colors of a fluorescent lamp manufactured as one embodiment of the present invention and the results of the observation evaluation thereof.

[Explanation of symbols]

 1 Chromaticity range excellent in color discrimination 2 Chromaticity range excellent in whiteness 3 Isochromatic temperature line of correlated color temperature of 3500K 4 Isochromatic temperature line of correlated color temperature of 3400K 5 Chromaticity range in which particularly favorable effects are obtained

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Tohru Higashi 1-1, Kochicho, Takatsuki-shi, Osaka Pref.

Claims (5)

[Claims] 1. A phosphor having an emission peak at a wavelength of 400 to 470 nm, a phosphor having an emission peak at a wavelength of 470 to 535 nm, a phosphor having an emission peak at a wavelength of 540 to 550 nm, and an emission at a wavelength of 600 to 615 nm. A fluorescent lamp comprising: a phosphor layer having a mixed phosphor mainly composed of a phosphor having a peak and a phosphor having an emission peak at a wavelength of 615 to 670 nm, which is formed on an inner surface of a glass tube, The chromaticity point of light color is CIE1960
On the uv chromaticity diagram, the chromaticity point (u, v) = (0.224,
0.330), the major axis is in the range of an ellipse of 0.056, the minor axis is 0.024, the inclination from the u axis is 20 degrees, and the chromaticity point (u, v) = (0 .224,0.
330) and the major axis is 0.078 and the minor axis is 0.0
At 14, the chromaticity point (u, v) = (0.235, 0.33) is within the range of the ellipse whose inclination from the u axis is 30 degrees.
5) The major axis is 0.060 and the minor axis is 0.030 centered on 5).
Is within the range of the ellipse whose inclination from the u axis is 30 degrees,
And within a range of an ellipse having a major axis of 0.060, a minor axis of 0.018, and an inclination of 20 degrees from the u axis centering on the chromaticity point (u, v) = (0.225, 0.330). Wherein the correlated color temperature is within a range lower than the isocolor temperature line of 3500K on the color temperature side. 2. A phosphor having an emission peak at a wavelength of 400 to 470 nm, a phosphor having an emission peak at a wavelength of 470 to 535 nm, a phosphor having an emission peak at a wavelength of 540 to 550 nm, and an emission at a wavelength of 600 to 615 nm. A fluorescent lamp comprising: a phosphor layer having a mixed phosphor mainly composed of a phosphor having a peak and a phosphor having an emission peak at a wavelength of 615 to 670 nm, which is formed on an inner surface of a glass tube, The chromaticity point of light color is CIE1960
On the uv chromaticity diagram, the chromaticity point (u, v) is (0.235,
0.342), (0.252, 0.345), (0.2
48, 0.338), (0.239, 0.334)
A fluorescent lamp characterized by being within a range surrounded by a dot. 3. The CIE 1960uv chromaticity diagram according to claim 1, wherein the chromaticity point of the light color has a correlated color temperature in a lower color temperature range than the isochromatic temperature line of 3400K. Fluorescent lamp. 4. The chromaticity point of light color is (u, v) = (0.2457, 0.3403) on the CIE1960uv chromaticity diagram.
The fluorescent lamp according to any one of claims 1 to 3, wherein the center is within a circle having a radius of 0.003. 5. The phosphor having an emission peak at a wavelength of 400 to 470 nm is made of at least one kind of a divalent europium-activated blue phosphor, and the wavelength of 470 to 535 nm.
The phosphor having an emission peak at m comprises at least one of a divalent europium-activated blue-green phosphor and a divalent manganese-activated or divalent europium and a divalent manganese-activated green phosphor, and has the wavelength of 540 to 550 nm. The phosphor having an emission peak at least comprises at least one of trivalent terbium-activated or trivalent cerium and trivalent terbium-activated green phosphor, and the phosphor having an emission peak at the wavelength of 600 to 615 nm is trivalent europium. And at least one of activated red phosphors,
The phosphor having an emission peak at 70 nm comprises at least one of trivalent europium-activated, divalent manganese-activated, and tetravalent manganese-activated red phosphors. The fluorescent lamp according to item 1.