JP2001338613A - Fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fluorescent lamp at low cost, which is capable of a minimum color identification, has high efficiency and gives better white impression. SOLUTION: The fluorescent lamp with the chromaticity values (x, y) of light source color within an area surrounded by point A (0.251, 0.343), point B (0.285, 0.332), point C (0.402, 0.407), and point D (0.343, 0.433), has on its inside glass tube face a phosphor mixture including antimony manganese activated calcium halophosphate, and a mixture of rare earth phosphor emitting a green light and rare earth phosphor emitting a blue or a red light.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a fluorescent lamp. In particular, the present invention relates to a fluorescent lamp which has high efficiency and a white color in light color.

[0002]

2. Description of the Related Art Conventional fluorescent lamps for general lighting use JIS.
(Japanese Industrial Standards) Z9112-1990: a fluorescent lamp having a light source color in the chromaticity range described in “Segmentation by Light Source Color and Color Rendering Property of Fluorescent Lamp”, and a good color rendering property. That is, the fluorescent lamp had a high average color rendering index Ra used as an evaluation of color appearance. The average color rendering index Ra is an index indicating the fidelity of color reproduction of various light sources with respect to the color appearance of a color chart under a reference light source (black body radiation / composite daylight).

[0003] Since a conventional fluorescent lamp for general illumination has good color rendering properties, the chromaticity coordinates of the fluorescent lamp do not largely deviate upward (DUV is positive) from the locus of blackbody radiation. With such considerations, development was being made. On the other hand, a fluorescent lamp with high efficiency and minimum color discrimination even if the color rendering property is poor is disclosed in International Publication No. 9
No. 7/11480. This fluorescent lamp classifies the color of the object to be illuminated into categories (red, orange, yellow, green, blue, purple, pink, brown, white,
It has been developed for the purpose of being able to distinguish between gray and black) and achieving high efficiency, and is designed so that the deviation (DUV) from the blackbody radiation locus becomes large.

However, the light source color of this highly efficient fluorescent lamp includes a chromaticity range in which the color tone is strongly felt. Therefore, when this fluorescent lamp is used in combination with a fluorescent lamp for general illumination, a sense of incongruity is caused. May give. To alleviate this discomfort, high-efficiency fluorescent lamps that have minimal color discrimination, have no color tone of the light source color, and have a white appearance,
It is disclosed in WO 98/36441. The fluorescent lamp disclosed in this publication will be referred to as a “new fluorescent lamp”.

In this new fluorescent lamp, the light source color is shifted so that the DUV is larger to the plus side than the light source color of the conventional general lighting fluorescent lamp, so that the same phosphor as the general lighting fluorescent lamp is used. Even when is used, the luminous efficiency [lm / W] can be increased. The reason is as follows. When the light source color is such that the DUV has a large chromaticity value on the plus side, a narrow band light emitting rare earth phosphor that emits green light having the highest luminous efficiency [lm / W] among the phosphors is used. This is because many can be included.

[0006]

The phosphors used in the above-mentioned new fluorescent lamp include (1) a rare earth phosphor emitting green light, a rare earth phosphor emitting blue light and a rare earth phosphor emitting red light. And a combination of (2) a rare-earth phosphor emitting green light and a broadband light-emitting calcium halophosphate phosphor having little color. The latter has the advantage over the former that the luminous efficiency is greatly reduced but the lamp price can be reduced. This is because rare earth phosphors are expensive while calcium halophosphate phosphors are cheap. That is,
If the weight ratio [%] of the calcium halophosphate phosphor can be increased and the weight ratio [%] of the rare earth phosphor can be reduced, the price can be reduced accordingly.

However, a new fluorescent lamp constituted by a combination of a rare earth phosphor emitting green light having the highest luminous efficiency and a calcium halophosphate phosphor which is the least expensive has an advantage that the price can be reduced. However, the luminous efficiency [lm / W] is greatly reduced, and the luminous efficiency [lm / W] is almost the same as that of a conventional general fluorescent lamp having excellent color rendering properties.
W]. That is, in the new fluorescent lamp, the advantage of improving the luminous efficiency has been lost. The reason is that the calcium halophosphate phosphor has a lower luminous efficiency [lm / W] and a luminous color closer to white than the rare earth phosphor that emits green light. This is because in order to achieve the specified chromaticity range, a relatively large amount of calcium halophosphate phosphor must be used as compared with a rare earth phosphor that emits green light. To further explain, in order to make the light source color that becomes greener due to the influence of the rare-earth phosphor emitting green light with high luminous efficiency more white with the calcium halophosphate phosphor, the luminous efficiency [lm / W] Therefore, it is necessary to use a large number of calcium halophosphate phosphors having low], and as a result, the luminous efficiency of the new fluorescent lamp is reduced to the same level as a conventional general fluorescent lamp having high color rendering.

The present invention has been made in view of the above points, and a main object of the present invention is to provide a fluorescent lamp having a white appearance and a high luminous efficiency in addition to being capable of minimum color discrimination. An object of the present invention is to provide a fluorescent lamp with almost no increase in price.

[0009]

A fluorescent lamp according to the present invention has a chromaticity value (x, y) of a light source color at a point A (0.251,
0.343), point B (0.285, 0.332), point C
(0.402, 0.407) and point D (0.343,
0.433), wherein the phosphor includes an antimony / manganese-activated calcium halophosphate phosphor, a rare-earth phosphor emitting green light, and a rare-earth phosphor emitting blue or red light. The mixture is on the inner surface of the arc tube.

In the range surrounded by the points A, B, C and D, the chromaticity value (x, y) of the light source color of the fluorescent lamp is set in a region where the DUV is 10 or more on the plus side.
It is preferred that there is.

[0011] Of the range surrounded by the points A, B, C and D, IEC Publ. 81 and JI
The chromaticity value (x, y) of the light source color of the fluorescent lamp may be in an area excluding the chromaticity range of the light color classification of the fluorescent lamp of SZ9112.

In the range surrounded by the points A, B, C and D, the chromaticity value (x, y) of the light source color of the fluorescent lamp is set in a region where the correlated color temperature is 4000 Kelvin [K] or more. ) Is preferred.

The luminous flux resulting from the emission of the antimony / manganese-activated calcium halophosphate phosphor is referred to as a luminous flux a. When the sum of the luminous flux and the luminous flux due to the emission of the rare-earth phosphor in the range of 530 to 580 [nm] is the luminous flux b, the ratio of the luminous flux a to the entire luminous flux of the fluorescent lamp is 30 to 90. [%], And the remainder is preferably occupied by the light flux b.

The peak wavelength of the emission spectrum is 420
The luminous flux of the rare earth phosphor within the range of about 470 [nm] is defined as luminous flux c, and the peak wavelength of the luminescent spectrum is 53.
When the light flux of the light emission intensity of the rare-earth phosphor within the range of 0 to 580 [nm] is the light flux d, the ratio of the light flux c to the light flux b is 0.1 to 15 [%].
It is preferable that the light flux d occupy the remainder.

The luminous flux due to the emission of the antimony / manganese-activated calcium halophosphate phosphor is referred to as a luminous flux e. In the case where the sum of the luminous flux and the luminous flux due to the emission of the rare-earth phosphor in the range of 600 to 650 [nm] is the luminous flux f, the ratio of the luminous flux e to the entire luminous flux of the fluorescent lamp is 30 to 90. [%], And the remainder is preferably occupied by the light beam f.

The peak wavelength of the emission spectrum is 530.
The luminous flux of the luminous intensity of the rare-earth phosphor in the range of 580 nm to 580 nm is defined as luminous flux g, and the luminous flux of the luminous intensity of the rare-earth phosphor whose peak wavelength of the luminous spectrum is in the range of 600 to 650 nm is used. In the case of the light flux h, the ratio of the light flux h to the light flux f is 0.
It is preferable that the light flux g occupies the remainder.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION The inventors of the present application have made intensive studies on improving the luminous efficiency of a fluorescent lamp using a phosphor in which a rare earth phosphor emitting green light and a calcium halophosphate phosphor are combined. It has been found that by adding a trace amount of a rare-earth phosphor that emits blue or red light, whose luminous efficiency is not so high, to the phosphors of the combination, the luminous efficiency can be greatly increased with little increase in cost. That is, when a rare earth phosphor emitting blue or red light is added, even if the amount of the calcium halophosphate phosphor used in a conventional configuration in large amounts to obtain a white appearance is reduced, a light source color having a white appearance is obtained. I found that it became possible. According to this technique,
Since the amount of the rare earth phosphor that emits green light can be relatively increased, the luminous efficiency of the fluorescent lamp can be improved. As a result, it is possible to provide a well-balanced fluorescent lamp with significantly increased luminous efficiency, with little increase in cost.

An embodiment according to the present invention will be described below with reference to the drawings. Note that the present invention is not limited to the following embodiments.

FIG. 1 is a chromaticity diagram for explaining the chromaticity range of the light source color in the fluorescent lamp of this embodiment.

The fluorescent lamp of this embodiment has a light source color in a range (hatched portion in the figure) surrounded by points A, B, C and D in the chromaticity diagram shown in FIG. ing. That is, the chromaticity value (x, y) of the light source color in the fluorescent lamp of the present embodiment is the point A (0.251, 0.34).
3), point B (0.285, 0.332), point C (0.4
02, 0.407) and point D (0.343, 0.43
It is in the range surrounded by 3). Further, the fluorescent lamp of the present embodiment includes a phosphor mixture including an antimony / manganese-activated calcium halophosphate phosphor, a rare earth phosphor emitting green light, and a rare earth phosphor emitting blue or red light on the inner surface of the arc tube. Have. That is, a calcium halophosphate phosphor and two kinds of rare earth phosphors are included as the phosphor of the fluorescent lamp.

FIG. 1 shows, for reference, the chromaticity range (x,
y), that is, the point A ′ (0.228, 0.351),
Point B (0.285, 0.332), Point C (0.402,
0.407) and a range surrounded by the point D ′ (0.295, 0.453). A method for obtaining the chromaticity range of the light source color in a conventional new fluorescent lamp is disclosed in International Publication No. 9
No. 8/36441. Here, WO 98/36441 is incorporated herein by reference.

The chromaticity range of the conventional new fluorescent lamp is
Based on the light color of the combination of the rare-earth phosphor emitting green and the rare-earth phosphor emitting red, based on data from an experiment in which blue light was mixed until the color disappeared and began to feel white. It is what was sought. The chromaticity range of the present embodiment in FIG. 1 is based on the light color of the combination of the rare-earth phosphor emitting green and the rare-earth phosphor emitting blue, and is mixed with red light until it starts to feel white. This is realized based on the experimental data.

In the conventional new fluorescent lamp, an appropriate chromaticity range in the correlated color temperature direction is defined, whereas in the fluorescent lamp of the present embodiment, an appropriate chromaticity in the DUV direction is set. The range is more strictly defined. In other words, the line segment A′-B and the line segment CD ′ are determined in the conventional new fluorescent lamp, whereas the line segment AD is newly found in the fluorescent lamp of the present embodiment. It is. This makes it possible to exclude a region in the conventional new fluorescent lamp where a slight color is felt from the chromaticity range of the fluorescent lamp of the present embodiment, and as a result, a region having a higher whiteness is led. . Line segment AD in FIG.
Is calculated from a plot of x, y chromaticity values (square points in the figure) obtained by experiments by the inventor of the present application, and y = 0.
98x + 0.097.

In the chromaticity range indicated by the hatched portion in FIG. 1, a region where the DUV is 10 or more on the positive side is preferable from the viewpoint of improving luminous efficiency. This is because the higher the DUV is on the plus side, the higher the luminous efficiency can be set. D
UV is more preferably 15 or more on the plus side, and further preferably more than 20.

In the chromaticity range indicated by the shaded area, I
EC Publ. The chromaticity range of the light source color classification of the fluorescent lamp of 81 and JISZ9112 may be excluded. By setting the chromaticity range outside of these light source color categories, it is possible to achieve higher efficiency than the conventional light source, and it is possible to more clearly realize a light source color that has never existed before.

In addition, of the chromaticity ranges indicated by the hatched portions,
It is preferable that the correlated color temperature be in a region of 4000 Kelvin [K] or more in order to obtain a higher whiteness. That is, in order to obtain a higher whiteness, it is preferable to set the limit value in the correlated color temperature direction to 4000 K, and to use a fluorescent lamp having a correlated color temperature of an arbitrary value higher than that. More preferably, the correlated color temperature is 4500K or more.

Note that the DUV and the correlated color temperature of points A to D are respectively shown as point A (DUV 42.5 and 10112).
K), point B (DUV19.2 and 8090K), point C
(DUV7.8 and 3698K), point D (DUV36.
5 and 5241K).

Next, an example of the configuration of the fluorescent lamp of the present embodiment will be described with reference to FIG. FIG. 2 schematically shows a cross-sectional structure of a part of a straight tube fluorescent lamp, with a part cut away.

The fluorescent lamp shown in FIG. 2 is a 40 W straight tube fluorescent lamp, which comprises a glass tube (bulb) 18 as an arc tube of the fluorescent lamp and a phosphor film 19 applied on the inner surface of the glass tube 18. Have. The phosphor film 19 is composed of a mixture (phosphor mixture) of an antimony / manganese-activated calcium halophosphate phosphor, a rare earth phosphor emitting green light, and a rare earth phosphor emitting blue or red light. The end of the glass tube 18 is closed by a stem 20, and a pair of inner conductors 21 extend from the stem 20. A filament electrode 22 is mounted between the distal ends of the inner conductors 21. A base 23 is attached to an end of the glass tube 18, and the base 23 is electrically connected to the inner conductor 21. Although a straight tube type configuration is shown here, the present invention is not limited to this, and may be a tube type fluorescent lamp or another structure. Further, the luminous tube of the fluorescent lamp is not limited to a glass tube, and may be a tube made of ceramic having high transparency (translucent ceramic tube).

Next, reference is made to FIG. FIG. 3 is a configuration diagram of an experimental apparatus used for an experiment for obtaining a chromaticity range of the fluorescent lamp of the present embodiment.

The experimental apparatus shown in FIG. 3 includes a black light-shielding mask 6 disposed in front of a subject 5 and a light source (a) 8, a light source (b) 9, and a light source ( c) 10. The light-shielding mask 6 is provided with an observation light-emitting unit 7 having a visual dimension of 2 degrees at the position of the line of sight of the subject 5. The light source (a) 8 is LAP (light color is green, the emission peak wavelength is 543 [nm], the composition of the phosphor is LaPO ₄ : Ce, Tb), and the light source (b) 9 is
SCA (light color is blue, emission peak wavelength is 452 [n
m], and the composition of the phosphor is (Sr, Ca, Mg) ₅ (PO ₄ )
₃ Cl: Eu)) and the light source (c) 10 is Y
OX (light color is red, emission peak wavelength is 611 [nm],
The composition of the phosphor is Y ₂ O ₃ : Eu). Light source (a) ~
(C) The light emitted from 8 to 10 is light-distributed and controlled by the reflection plate 11 so that light can be sufficiently mixed.
Table 1 shows the light sources (a) 8 and (b) used in this experiment.
9 and (c) show x, y chromaticity values of 10.

[0032]

[Table 1]

Each of the light sources (a) 8, (b) 9, and (c) 10 is connected to a computer 12 via a control unit 13.
And light sources (a) 8, (b) 9, (c) 1
The light outputs of 0 can be independently varied via the control unit 13 according to signals from the computer 12. An adjustment knob 14 for adjusting the light output of the light source (c) 10 is connected to the computer 12, and the subject 5 uses the adjustment knob 14 to adjust the light source (c).
Only ten light outputs can be freely varied. In this experiment, light sources (d), (e), and (f) were used in which the luminous flux ratio [%] of the light sources (a) 8 and (b) 9 was 96: 4, 95: 5, and 93: 7. I decided that. Table 2 below
Shows the x and y chromaticity values of the light sources (d), (e) and (f).

[0034]

[Table 2]

In this experiment, the light sources (d), (e), (f)
Is randomly presented to the observation light emitting unit 7, and then the subject 5
Until the color begins to feel white, the light from the light source (c) 10 is additionally mixed, so that the light sources (a) 8, (b) 9,
(C) The luminous flux ratio [%] of 10 was determined. 3 subjects,
The number of repetitions of one condition was three. Table 3 below shows the light sources (a) 8, (b) 9,
(C) The average value of the luminous flux ratio [%] of 10 (upper row of each row) is shown, and the lower row of each row in Table 3 shows the standard deviation between subjects. The light sources (g), (h), and (i) are light sources having a light flux ratio of an average value. The light source (g) is obtained by additionally mixing the light from the light source (c) 10 with the light from the light source (d). Similarly, the light source (h) is obtained from the light source (c) 10 by the light source (e). The light source (i) is obtained by additionally mixing the light from the light source (c) 10 with the light source (f).

[0036]

[Table 3]

As shown in Table 3, since the standard deviation indicating the variation in the results of this experiment is small, the light sources (g), (h),
It can be said that (i) has a chromaticity that starts to feel white for all the subjects. The square points in FIG. 1 plot the x, y chromaticity values of the light sources (g), (h), and (i), and the line segment AD in FIG.
(H), regression line (y) obtained from x, y chromaticity values of (i)
= 0.98x + 0.097). Light source (g),
(H) and (i) have a chromaticity that starts to feel white for all the subjects, and therefore, by using the light source color of the hatched portion in FIG. A fluorescent lamp having a whiter feeling can be realized.

Next, a description will be given of a phosphor for realizing the light source color of the fluorescent lamp of the present embodiment.

FIG. 4 is a chromaticity diagram for explaining chromaticity values of light source colors in the fluorescent lamp of the present embodiment. The phosphor according to the present embodiment is applied to the inner wall of a 40 W straight tube fluorescent lamp.

FIG. 4 shows the light sources (j), (k) and (l) in which the weight ratio [%] of the rare earth phosphor (LAP) emitting green light and the calcium halophosphate phosphor (D) are changed. The chromaticity values are shown. Note that the calcium halophosphate phosphor (D) has a daylight color and a phosphor composition of 3%.
The phosphor is Ca ₃ (PO ₄ ) ₂ .Ca (F, Cl) ₂ : Sb, Mn. FIG. 4 shows a light source (m) in which the weight ratio [%] of the rare earth phosphor (LAP) that emits green light and the rare earth phosphor (YOX) that emits red light is changed.
The chromaticity values of (n) and (o) are shown. In FIG. 4, (I)
(III) are the chromaticity values of the light source colors of the monochromatic fluorescent lamp by the respective phosphors of LAP, YOX, and D.

The light sources (j), (k) and (l) are prepared by setting the weight ratio [%] of the mixed phosphor LAP: D to be applied to the fluorescent lamp to (j) 60:40 and (k) 50:50. , (L)
40:60. On the other hand, the light source (m)
(N) and (o) show the weight ratio [%] of LAP: YOX as (m) 60:40, (n) 50:50, (o) 40: 6.
It is set to 0.

As can be seen from FIG. 4, in the white halo (daylight) calcium halophosphate phosphor (D), the chromaticity value of the light source color changes little with an increase in the weight ratio [%]. On the other hand, rare-earth phosphors emitting red light (YO
X) shows a large change in the chromaticity value of the light source color as the weight ratio [%] increases. In other words, it can be seen that YOX can greatly change the chromaticity value of the light source color by a small amount as compared with D. The reason is that additive light mixing is established in light mixing, so that light having a strong tint tends to affect the change in chromaticity value. This is true for a rare-earth phosphor emitting blue as well as a rare-earth phosphor emitting red.

Therefore, a rare earth phosphor emitting blue or red which emits blue light which enables a large change in chromaticity value with a small amount, and a rare earth phosphor emitting green which has the highest luminous efficiency [lm / W]. By combining the body with an inexpensive calcium halophosphate phosphor, it is possible to greatly adjust the chromaticity value of the light source color while increasing the weight ratio [%] of the calcium halophosphate phosphor.

In the structure of the above-mentioned phosphor, it is possible to realize a chromaticity value in the chromaticity region indicated by the hatched portion shown in FIG. 1 by using a small amount of the calcium halophosphate phosphor. An inexpensive fluorescent lamp cannot be provided. In order to realize an inexpensive fluorescent lamp, at least a calcium halophosphate phosphor is used at a weight ratio of 50%.
A configuration that includes the above is required.

In order to realize an inexpensive fluorescent lamp, if the amount of the calcium halophosphate phosphor is increased, the amount of the green rare earth phosphor having a high luminous efficiency [lm / W] is relatively increased. Therefore, the luminous efficiency [lm / W] of the fluorescent lamp using the mixed phosphor also decreases. Luminous efficiency of fluorescent lamp [lm / W]
In order to suppress the decrease in the luminance and to differentiate the fluorescent lamp from the conventional fluorescent lamp for general lighting, the luminous efficiency [lm / W] of 1.1 times or more of the fluorescent lamp for general lighting using the conventional calcium halophosphate phosphor alone is used. Realization is required. Therefore,
The present inventor has proposed a rare earth phosphor (LAP) that emits green light.
A 40 W straight tube fluorescent lamp in which the weight ratio [%] of the phosphor and the calcium halophosphate (D) was changed was prototyped, and the range of the optimum luminous flux ratio [%] of the calcium halophosphate was determined. It is known that when a very small amount of a rare-earth phosphor emitting blue or red light is added, the effect of improving the luminous efficiency [lm / W] is obtained. Therefore, the optimum luminous flux ratio [%] obtained from this prototype lamp is obtained. The lower limit of the range is established as an approximation of the lower limit of the range of the optimum luminous flux ratio [%] of the configuration including the rare earth phosphor emitting green, the calcium halophosphate phosphor, and the rare earth phosphor emitting blue or red.

FIG. 5 shows a rare earth phosphor (L) emitting green light.
2 shows the relationship between the weight ratio [%] and the luminous flux ratio [%] between the AP) and the calcium halophosphate phosphor (D).
As can be seen from FIG. 5, in order to set the weight ratio of D to 50% or more, the luminous flux ratio of D may be set to 26% or more.

Since this calcium halophosphate phosphor uses antimony (Sb) and manganese (Mn) as activators, by changing the ratio of these activators, daylight color (D) and day white (N) are obtained. , White (W), warm white (W
W) and various light colors can be realized. The inventor of the present application sought a similar relationship for light colors other than daylight color (D).
As a result, in order to set the weight ratio to 50% or more,
In the luminous flux ratio [%], 27 for daylight white (N)
[%], 29 [%] for white (W), and 28 [%] or more for warm white (WW). Therefore, in order to make the weight ratio of the calcium halophosphate phosphor 50% or more, the luminous flux ratio of the calcium halophosphate phosphor may be made 30% or more even in consideration of the variation of the prototype lamp.

FIG. 6 shows each luminous flux ratio [%] of the rare earth phosphor (LAP) and the calcium halophosphate phosphor (D),
The relationship between the luminous efficiency [lm / W] of the fluorescent lamp D for general illumination (fluorescent lamp using only a calcium halophosphate phosphor) and the luminous efficiency ratio of the mixed fluorescent lamp is shown.

As can be seen from FIG. 5, in order to make the luminous efficiency ratio of the conventional fluorescent lamp for general lighting (D) 1.1 times or more, the luminous flux ratio of the calcium halophosphate phosphor is set to 90%.
[%] Or less. From the above, the luminous flux ratio of the calcium halophosphate phosphor is set to 30 to 90%,
The luminous flux of the two kinds of rare earth phosphors is set to 10 to 7 so that the remainder is occupied by the luminous flux of the two kinds of rare earth phosphors.
It may be 0 [%]. From the viewpoint of realizing higher luminous efficiency, the upper limit of the luminous flux ratio [%] of the calcium halophosphate phosphor is, for example, preferably 80 [%] or less, and more preferably 70 [%] or less.

Next, the luminous flux ratio [%] of the two kinds of rare earth phosphors in the fluorescent lamp of the present invention constituted by the calcium halophosphate phosphor and the two kinds of rare earth phosphors will be described.

FIG. 7 shows the chromaticity values of the light source colors of various light sources obtained by changing the combination of the phosphors of the 40 W straight tube fluorescent lamp. Note that the chromaticity region 1 in FIG. 7 corresponds to the hatched portion shown in FIG.

In FIG. 7, (I) to (VII) show the chromaticity values of the light source colors of the monochromatic fluorescent lamp. 4 are the same as those in FIG. 4, and (IV) is a calcium halophosphate phosphor: N, which emits a neutral white light.
(V) is a calcium halophosphate phosphor emitting white light:
W, (VI) show the chromaticity value of the light source color of the monochromatic fluorescent lamp coated with the calcium halophosphate phosphor which emits warm white: WW, and (VII) the rare earth phosphor which emits blue: BAT. . BAT has an emission peak wavelength of 452 [nm] and a phosphor composition of BaMgAl ₁₀
O ₁₇ : a phosphor of Eu.

(R) in FIG. 7 shows LAP and BAT.
And the luminous flux ratio LAP: BAT = 98: 2.
The chromaticity value of the light source color of the fluorescent lamp prepared so as to be [%] is shown. The chromaticity value of the light source color of the fluorescent lamp in which the two types of phosphors are mixed is positioned on a line (I)-(VII) connecting the chromaticity values of the light source colors of the respective monochromatic fluorescent lamps. become. Therefore, the rare earth phosphor: LAP
And a calcium halophosphate phosphor: D, N, W, WW, the chromaticity value of the light source color of the fluorescent lamp is (I) LA
A line segment (I)-(III) connecting P and (III) D, and (I)
A line segment (I)-(VI) connecting LAP and (VI) WW;
It falls within the range surrounded by the curve connecting (III) to (VI).

The curves (p) and (q) are obtained by connecting the chromaticity values of the light source colors at which the luminous efficiency is 90 [lm / W] in the various light sources obtained by changing the combination of the phosphors of the 40 W straight tube fluorescent lamp. The curves are shown. Curve (p) shows rare earth phosphor: LAP and calcium halophosphate phosphor: D, N,
This is a curve connecting the chromaticity values of the light source colors of the respective fluorescent lamps having a luminous efficiency of 90 [lm / W] for the fluorescent lamp configured by combining W and WW. On the other hand, the curve (q) shows the rare earth phosphor (LAP) and the rare earth phosphor (B
AT) and a phosphor mixed with calcium halophosphate phosphors (D, N, W, WW) in a light flux ratio of LAP: BAT = 98: 2 [%] to emit light. Efficiency 90 [lm / W]
Is a curve connecting the chromaticity values of the light source colors of the respective fluorescent lamps.

The fluorescent lamp composed of these phosphors is a rare earth phosphor (L) having a high luminous efficiency [lm / W].
As the ratio of (AP) increases, the luminous efficiency [lm / W] of the fluorescent lamp also increases. Therefore, a fluorescent lamp showing a chromaticity value in a region above (toward LAP) above the curves (p) and (q) has a luminous efficiency [lm / W] higher than 90 [lm / W].
W], and the fluorescent lamp indicating the chromaticity value of the lower region is 9
The luminous efficiency [lm / W] is lower than 0 [lm / W].

As shown in FIG. 7, since the curve (p) is located above the curve (q), the combination of the rare earth phosphor (LAP) and the calcium halophosphate phosphor (D, N, W, WW) is used. Even if the fluorescent lamp has the same chromaticity value as 90 [lm / W], the rare earth phosphor (LAP), the rare earth phosphor BAT, and the calcium halophosphate phosphor (D,
N, W, and WW) are 90
High luminous efficiency [lm / W] of [lm / W] or more can be realized. In other words, the fluorescent lamp of this embodiment using a combination of LAP, BAT, and a calcium halophosphate phosphor (D, N, W, WW) is 90 [lm / W].
With a chromaticity value that can achieve the following, the fluorescent lamp using the combination of the LAP and the calcium halophosphate phosphor (D, N, W, WW) cannot achieve 90 [lm / W],
It will be less than 90 [lm / W].

Therefore, a rare earth phosphor (LAP) emitting green light and a calcium halophosphate phosphor (D, N,
W, WW) and rare earth phosphors (LAP) that emit green light and rare earth phosphors (BA) that emit blue light
T) and calcium halophosphate phosphors (D, N, W, W
The combination with W) can achieve higher luminous efficiency [lm / W] even with the same chromaticity value.

In the case of a combination of two kinds of rare earth phosphors and a calcium halophosphate phosphor, in order to realize a fluorescent lamp in which the chromaticity value of the light source color is within the chromaticity region 1, BAT is required.
Is preferably equal to or less than the amount of (s) in FIG. (S) shows the chromaticity value of the light source color of the fluorescent lamp prepared so that the luminous flux ratio between LAP and BAT (LAP: BAT) is 85:15 [%]. The content may be set to 0.1% or more from the viewpoint of the mixing accuracy of the phosphor. That is, BA
The luminous flux ratio of T is set to 0.1 to 15%, and the rest is L
What is necessary is just to mix so that it may become luminous flux ratio of AP (namely, 99.9-85 [%]).

When this luminous flux ratio [%] is converted into a luminous flux ratio [%] including the light emission of the calcium halophosphate phosphor, the luminous flux ratio of the two kinds of rare earth phosphors to the calcium halophosphate phosphor is 10 to 70 [%]. , So B
The luminous flux ratio of the AT is 0.01 to 10.5 [%].
Therefore, a small amount of rare earth phosphor emitting blue
By adding to the rare earth phosphor and the calcium halophosphate phosphor that emit green light, an inexpensive fluorescent lamp with high luminous efficiency [lm / W] can be realized with almost no change in the amount of the calcium halophosphate phosphor. .

The calcium halophosphate phosphor (II
By mixing both I) D and (IV) N, an arbitrary chromaticity value on the line segment (III)-(IV) can be realized. Furthermore, calcium halophosphate phosphor (III)
D ~ (VI) By blending WW, curve (III)
~ (VI) any chromaticity value can be realized. Therefore, the line segment (r)-(III) and the line segment (r)-(V
I) and all the chromaticity values within the chromaticity range surrounded by the curves (III) to (VI) are calculated using LAP, BAT, and the calcium halophosphate phosphor (D, N, W, WW). This can be achieved by changing the ratio.

In the above-described embodiment, the BAT phosphor having a strong blue tint is used. However, the SCA phosphor used in the experiment for obtaining the white sensation region or the composition of the phosphor is BaM.
A phosphor of gAl ₁₀ O ₁₇ : Eu, Mn may be used.

Next, a rare earth phosphor (LA) emitting green light
P), a combination of a rare-earth phosphor (YOX) that emits red light and a calcium halophosphate phosphor will be described.

(I) to (VII) in FIG. 8 show the chromaticity values of the light source colors of the same monochromatic fluorescent lamp as in FIG. (U)
Is the light flux ratio LAP: YOX = 9.
The chromaticity value of the light source color of the fluorescent lamp prepared so as to be 0:10 [%] is shown, and (v) shows that the luminous flux ratio LAP: YOX = 50: 50 [%] is prepared by mixing LAP and YOX. The chromaticity value of the light source color of the fluorescent lamp is shown.

Curves (p) and (t) show the curves connecting the chromaticity values of the light source colors with a luminous efficiency of 90 [lm / W] in a 40 W straight tube fluorescent lamp in which the combination of phosphors is changed. ing. The curve (p) is a curve connecting the chromaticity values of the light source colors by the same combination of the phosphors as in FIG. On the other hand, the curve (t) shows the light flux ratio LAP: YOX = 90: 10 between the rare earth phosphor (LAP) and the rare earth phosphor (YOX).
It is a curve connecting the chromaticity values of the light source colors by the combination of the mixed phosphor mixed to be [%] and each of the calcium halophosphate phosphors (D, N, W, WW).

Similarly to FIG. 7, also in FIG. 8, the fluorescent lamp having the chromaticity value in the upper region near the LAP of each curve has higher luminous efficiency and the fluorescent lamp having the chromaticity value in the lower region. Is lower. As can be seen from FIG. 8, since curve (t) is below curve (p), therefore, LAP and calcium halophosphate phosphor (D,
N, W, WW) rather than LAP and YOX
And calcium halophosphate phosphor (D, N, W, WW)
Is better than the luminous efficiency [lm /
W] can be realized.

A rare earth phosphor (YO) emitting red light
The mixing amount of (X) is equal to or less than the mixing amount of (v) in setting the chromaticity value of the light source color in the fluorescent lamp having the configuration of the two kinds of rare earth phosphors and the calcium halophosphate phosphor in the chromaticity region 1. It is preferred that (V) LA
The luminous flux ratio between P and YOX (LAP: YOX) is 50: 5
The chromaticity value of the light source color of the fluorescent lamp prepared to be 0 [%] is shown. Therefore, the luminous flux ratio of YOX is set to 50.
[%] Or less, and 0.1 from the viewpoint of phosphor compounding accuracy.
[%] Or more may be set. That is, the luminous flux ratio of YOX may be set to 0.1 to 50 [%], and the remainder may be adjusted to be the luminous flux ratio of LAP (that is, 99.9 to 50 [%]).

When this luminous flux ratio [%] is converted into a luminous flux ratio [%] including light emission of the calcium halophosphate phosphor, the luminous flux ratio of the two kinds of rare earth phosphors to the calcium halophosphate phosphor is 10 to 70 [%]. , So Y
The luminous flux ratio of OX is 0.01 to 35 [%]. Therefore, by adding a small amount of the rare-earth phosphor (YOX) that emits red light to the rare-earth phosphor and the calcium halophosphate phosphor that emit green, a high luminous efficiency [lm / m] can be obtained without substantially reducing the amount of the calcium halophosphate phosphor. W], an inexpensive fluorescent lamp can be realized.

The peak wavelength of the emission spectrum is 53
As the phosphor of 0 to 580 [nm], a phosphor having a composition of CeMgAl ₁₁ O ₁₉ : Tb may be used.

[0069]

According to the fluorescent lamp of the present invention, point A
(0.251, 0.343), point B (0.285, 0.
332), point C (0.402, 0.407) and point D
There is a chromaticity value (x, y) of a light source color in a range surrounded by (0.343, 0.433), and an antimony / manganese-activated calcium halophosphate phosphor, a rare-earth phosphor emitting green and a blue or red color Since the phosphor mixture containing a mixture of rare earth phosphors that emits light to the inside of the glass tube has a minimum color discrimination, it has a white appearance and a high luminous efficiency. The lamp,
Fluorescent lamps can be provided with little increase in price. That is, it is possible to realize a highly efficient white fluorescent lamp at a low price.

[Brief description of the drawings]

FIG. 1 is a chromaticity diagram for explaining an x, y chromaticity range of a fluorescent lamp according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view schematically illustrating an example of a configuration of a fluorescent lamp according to the embodiment.

FIG. 3 is a configuration diagram of an experimental apparatus used for an experiment for obtaining a chromaticity range of the fluorescent lamp according to the embodiment.

FIG. 4 shows light sources (I) to (III) and light sources (j) to (o).
FIG. 6 is a chromaticity diagram showing the chromaticity points of.

FIG. 5 is a graph showing a relationship between a weight ratio and a luminous flux ratio with a rare earth phosphor (LAP): calcium halophosphate phosphor (D).

FIG. 6 is a graph showing a relationship between a luminous flux ratio and a light emission ratio with a rare earth phosphor (LAP): calcium halophosphate phosphor (D).

FIG. 7 is a chromaticity diagram showing chromaticity points of light sources (I) to (VI), light sources (r) and (s), and curves (p) and (q) of the same luminous efficiency.

FIG. 8 is a chromaticity diagram showing chromaticity points of light sources (I) to (VI), light sources (u) and (v), and curves (p) and (t) of the same luminous efficiency.

[Description of Signs] 5 Subject 6 Light-shielding mask 7 Observation light emitting unit 8 Light source (a): LAP 9 Light source (b): SCA 10 Light source (c): YOX 11 Reflector 12 Computer 13 Control unit 14 Adjusting knob 18 Glass tube ( Bulb) 19 Phosphor film (Phosphor) 20 Stem 21 Inner conductor 22 Filament 23 Cap

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor ▲ Ara ▼ Go Tsuyoshi 1006 Kadoma, Kadoma, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Yoshinori Tanabe 1006 Kadoma, Kadoma, Kadoma, Osaka Matsushita Company F-term (reference) 4H001 CA01 CA02 CA07 CC14 XA00 XA08 XA15 XA20 XA21 XA39 XA57 XB71 YA25 YA51 YA63 5C043 AA01 AA02 AA11 CC09 CD01 DD28 EA09 EB03 EB04 EC01

Claims (8)

[Claims] 1. The chromaticity value (x, y) of a light source color is a point A
(0.251, 0.343), point B (0.285, 0.
332), point C (0.402, 0.407) and point D
A fluorescent lamp in a range surrounded by (0.343, 0.433), comprising an antimony / manganese-activated calcium halophosphate phosphor, a rare earth phosphor emitting green, and a rare earth phosphor emitting blue or red. A fluorescent lamp having a phosphor mixture containing on the inner surface of an arc tube. 2. A chromaticity value (x, chromaticity value) of the light source color of the fluorescent lamp in an area where DUV is 10 or more on the plus side in the range surrounded by the points A, B, C, and D.
2. The fluorescent lamp according to claim 1, wherein y) is present. 3. In the range surrounded by the points A, B, C and D, IEC Publ. 81 and J
2. The fluorescent lamp according to claim 1, wherein a chromaticity value (x, y) of the light source color of the fluorescent lamp is located in a region excluding a chromaticity range of a light color classification of the fluorescent lamp of IS Z9112. 4. A chromaticity value (x) of the light source color of the fluorescent lamp in an area where the correlated color temperature is 4000 Kelvin [K] or more in the range surrounded by the points A, B, C, and D. , Y), the fluorescent lamp according to any of claims 1 to 3. 5. A light flux due to light emission of the antimony / manganese-activated calcium halophosphate phosphor as a light flux a, and a light flux due to light emission of the rare earth phosphor having a peak wavelength of an emission spectrum in a range of 420 to 470 [nm]; In the case where the sum of the light flux due to the light emission of the rare-earth phosphor and the peak wavelength of the emission spectrum in the range of 530 to 580 [nm] is the light flux b, the ratio of the light flux a to the entire light flux of the fluorescent lamp is 30. 5. The fluorescent lamp according to claim 1, wherein the light flux b occupies the balance of about 90%. 6. The peak wavelength of the emission spectrum is 42.
The luminous flux of the rare earth phosphor within the range of 0 to 470 [nm] is referred to as luminous flux c, and the peak wavelength of the luminescent spectrum is 5
When the light flux of the light emission intensity of the rare earth phosphor within the range of 30 to 580 [nm] is the light flux d, the ratio of the light flux c to the light flux b is 0.1 to 15
6. The fluorescent lamp according to claim 5, wherein the light flux d occupies [%]. 7. A light flux due to light emission of the antimony / manganese-activated calcium halophosphate phosphor is referred to as a light flux e, and a light flux due to light emission of the rare earth phosphor having a peak wavelength of an emission spectrum in a range of 530 to 580 [nm]; When the sum of the light flux due to the light emission of the rare-earth phosphor and the peak wavelength of the emission spectrum in the range of 600 to 650 [nm] is the light flux f, the ratio of the light flux e to the entire light flux of the fluorescent lamp is 30. The fluorescent lamp according to any one of claims 1 to 4, wherein the light flux f occupies the remaining 90%. 8. A peak wavelength of the emission spectrum is 53.
The luminous flux of the luminous intensity of the rare-earth phosphor in the range of 0 to 580 [nm] is defined as luminous flux g, and the luminous flux of the luminous intensity of the rare-earth phosphor whose peak wavelength of the luminous spectrum is in the range of 600 to 650 [nm]. Is the light flux h, the ratio of the light flux h to the light flux f is 0.1 to 50.
The fluorescent lamp according to claim 7, wherein the light flux g occupies the percentage [%].