JP3415596B2 - Fluorescent lamp - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fluorescent lamp. In particular, the present invention relates to a fluorescent lamp which is highly efficient and has a white color in its light color.

[0002]

2. Description of the Related Art Conventional fluorescent lamps for general lighting use JIS
The fluorescent lamp had a light source color within the chromaticity range described in "Japanese Industrial Standards" Z9112-1990 "Division by light source color and color rendering of fluorescent lamp", and was a fluorescent lamp having good color rendering. That is, it was a fluorescent lamp having a high average color rendering index Ra used for evaluating the appearance of colors. 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 the color chart under a reference light source (blackbody radiation / synthetic daylight).

Since conventional fluorescent lamps for general illumination have good color rendering properties, the chromaticity coordinates of the fluorescent lamps do not greatly deviate upward from the black body radiation locus (DUV is on the plus side). The development was done with such consideration. On the other hand, even if the color rendering is poor, there is a fluorescent lamp that is highly efficient and capable of minimum color discrimination.
It is disclosed in the 7/11480 pamphlet. This fluorescent lamp is based on the concept of the color of the irradiated object in categories ((red, orange, yellow, green, blue, purple, pink, brown, white,
It has been developed for the purpose of distinguishing between gray and black) and achieving high efficiency, and is designed so that the deviation from the black body radiation locus (DUV) becomes large.

However, since the light source color of this highly efficient fluorescent lamp also includes a chromaticity range in which a strong tint is felt, when this fluorescent lamp is used in combination with a fluorescent lamp for general illumination, a feeling of strangeness is felt. May be given. In order to alleviate this discomfort, a high-efficiency fluorescent lamp that is capable of minimal color discrimination and has a white appearance with no light source color
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 than the light source color of the conventional fluorescent lamp for general illumination in the plus side. Therefore, the same fluorescent substance as the fluorescent lamp for general illumination is used. Even when is used, the luminous efficiency [lm / W] can be increased. The reason for this is that when a light source color having a large chromaticity value on the plus side of DUV is used, a narrow band emission type rare earth phosphor that emits green light with the highest luminous efficiency [lm / W] among 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 that emits green light, a rare earth phosphor that emits blue light, and a rare earth phosphor that emits red light. And a combination of (2) a rare earth phosphor that emits green light and a broad band emission type calcium halophosphate phosphor with almost no tint. The latter has the advantage over the former that it is possible to reduce the lamp price, although the luminous efficiency is significantly reduced. This is because the price of the rare earth phosphor is high, whereas the price of the calcium halophosphate phosphor is low. 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, the new fluorescent lamp constructed by the combination of the rare earth fluorescent substance which emits green light with the highest luminous efficiency and the cheapest calcium halophosphate fluorescent substance has an advantage that the cost can be reduced. However, the luminous efficiency [lm / W] is significantly reduced, and the luminous efficiency [lm / W] is about the same as that of conventional fluorescent lamps with excellent color rendering properties.
W] That is, in the new fluorescent lamp, the advantage of improving the luminous efficiency has been lost. The reason for this is that the calcium halophosphate phosphor has a lower luminous efficiency [lm / W] than the rare earth phosphor that emits green light, and the emission color is close to white. This is because in order to achieve the specified chromaticity range, it is necessary to use a relatively large amount of calcium halophosphate phosphor as compared with the rare earth phosphor that emits green light. To further explain, in order to make the light source color that is closer to green due to the influence of the rare earth phosphor that emits green light with high luminous efficiency closer to white with the calcium halophosphate phosphor, the luminous efficiency [lm / W ] It is necessary to use a large amount of calcium halophosphate phosphor having a low], and as a result, the luminous efficiency of the new fluorescent lamp falls to the same level as that of a conventional fluorescent lamp having a high color rendering property.

The present invention has been made in view of the above points, and its main purpose is to provide a fluorescent lamp which has a white feeling and high luminous efficiency in addition to the minimum color discrimination. It is to provide fluorescent lamps 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), which is a fluorescent lamp including an antimony-manganese-activated calcium halophosphate phosphor, a rare earth phosphor that emits green light, and a rare earth phosphor that emits blue or red light. The mixture has 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 in a region where DUV is on the plus side 10 or more.
Is preferred.

Of the range surrounded by the points A, B, C and D, the 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 section of the fluorescent lamp of SZ9112.

In the area 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 an area having a correlated color temperature of 4000 Kelvin [K] or more. ) Is preferred.

The luminous flux by the light emission of the antimony-manganese-activated calcium halophosphate phosphor is defined as a luminous flux a, and the luminous flux by the emission of the rare earth phosphor whose emission spectrum peak wavelength is in the range of 420 to 470 [nm] and the luminous spectrum. When the sum of the light flux due to the light emission of the rare earth phosphor whose peak wavelength is in the range of 530 to 580 [nm] is a light flux b, the ratio of the light flux a to the entire light flux of the fluorescent lamp is 30 to 90. It is preferable that the light flux b occupies the rest, and the rest is the light flux b.

The peak wavelength of the emission spectrum is 420
The luminous flux of the rare earth phosphor in the range of ˜470 [nm] is defined as luminous flux c, and the peak wavelength of the luminous spectrum is 53.
When the luminous flux of the emission intensity for the rare earth phosphor in the range of 0 to 580 [nm] is the luminous flux d, the ratio of the luminous flux c to the luminous flux b is 0.1 to 15 [%].
It is preferable that the light flux d occupies the rest.

The luminous flux of the light emitted from the antimony-manganese-activated calcium halophosphate phosphor is defined as luminous flux e, and the luminous flux of the rare earth phosphor whose emission spectrum peak wavelength is in the range of 530 to 580 [nm] and the luminous spectrum. When the sum of the light flux due to the light emission of the rare earth phosphor whose peak wavelength is 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 to 90. [%], And the light flux f occupies the rest.

The peak wavelength of the emission spectrum is 530
The luminous flux of the emission intensity of the rare earth phosphor in the range of ˜580 [nm] is defined as the luminous flux g, and the luminous flux of the emission intensity of the rare earth phosphor in which the peak wavelength of the emission spectrum is in the range of 600 to 650 [nm] is defined. When the luminous flux h is used, the ratio of the luminous flux h to the luminous flux f is 0.
It is preferable that the light flux g occupies 1 to 50 [%] and the rest thereof is occupied by the light flux g.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION As a result of extensive studies by the present inventor, it has been found that the luminous efficiency of a fluorescent lamp using a phosphor of a combination of a rare earth phosphor that emits green light and a calcium halophosphate phosphor is improved. It has been found that by adding a very small amount of rare earth phosphor that emits blue or red light, which does not have a high luminous efficiency, to the combined phosphors, the luminous efficiency can be significantly increased with almost no increase in cost. That is, when a rare earth phosphor that emits blue or red is added, even if the amount of the calcium halophosphate phosphor that is used in a large amount to obtain a white feeling in the conventional structure is reduced, a white light source color is obtained. It has been found possible. According to this method,
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 improved light emission efficiency with almost no increase in cost.

Embodiments according to the present invention will be described below with reference to the drawings. The present invention is not limited to the embodiments below.

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

In the chromaticity diagram shown in FIG. 1, the fluorescent lamp of this embodiment has a light source color in a range surrounded by points A, B, C and D (hatched portion in the figure). 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, a phosphor mixture containing an antimony-manganese activated calcium halophosphate phosphor, a rare earth phosphor that emits green light, and a rare earth phosphor that emits blue or red light on the inner surface of the arc tube. Have That is, it contains a calcium halophosphate phosphor and two types of rare earth phosphors as phosphors for a fluorescent lamp.

In FIG. 1, 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 the range surrounded by the point D '(0.295, 0.453) is also shown. The method for obtaining the chromaticity range of the light source color in the conventional new fluorescent lamp is described in International Publication No. 9
It is disclosed in the pamphlet of 8/36441. Here, the pamphlet of International Publication No. 98/36441 is incorporated herein by reference.

The chromaticity range of the conventional new fluorescent lamp is
Based on the light color of a combination of a rare earth phosphor that emits green light and a rare earth phosphor that emits red light, based on the data obtained by mixing blue light colors until the tint disappears and you begin to feel white It was sought. In addition, the chromaticity range of the present embodiment in FIG. 1 is based on a light color obtained by combining a rare-earth phosphor that emits green light and a rare-earth phosphor that emits blue light, and mixes red light color until it begins to feel white. It was 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. The range is more rigorous. That is, the line segment A′-B and the line segment CD ′ are defined in the conventional new fluorescent lamp, whereas the line segment A-D is newly found in the fluorescent lamp of the present embodiment. Is. This makes it possible to exclude a region in which the conventional new fluorescent lamp has a slight tint from the chromaticity range of the fluorescent lamp of the present embodiment, and as a result, a region with a higher whiteness is obtained. . Line segment A-D in FIG.
Is calculated from a plot of x and y chromaticity values (square points in the figure) obtained by an experiment by the inventor of the present application, and y = 0.
It is represented by 98x + 0.097.

In the chromaticity range shown by the shaded area in FIG. 1, the region where the DUV is on the plus side 10 or more is preferable from the viewpoint of improving the luminous efficiency. This is because the higher the DUV is, the higher the luminous efficiency can be set. D
The UV is more preferably on the plus side of 15 or more, and even more preferably more than 20.

In the chromaticity range shown by the shaded area, I
EC Publ. 81 and the chromaticity range of the light source color section of the fluorescent lamp of JIS Z9112 may be excluded. This is because by setting the chromaticity range outside these light source color categories, it is possible to achieve higher efficiency than conventional light sources, and it is possible to more clearly realize light source colors that are not available in the past.

In addition, of the chromaticity range shown by the shaded area,
A region having a correlated color temperature of 4000 Kelvin [K] or higher is preferable in order to obtain higher whiteness. In other words, in order to obtain a higher whiteness, it is preferable to set the limit value in the correlated color temperature direction to the correlated color temperature of 4000K and use a fluorescent lamp having an correlated color temperature of any value higher than that. The correlated color temperature is more preferably 4500K or higher.

When the DUV and the correlated color temperature of points A to D are shown respectively, point A (DUV 42.5 and 10112)
K), point B (DUV19.2 and 8090K), point C
(DUV 7.8 and 3698K), point D (DUV36.
5 and 5241K).

Next, an example of the structure of the fluorescent lamp of this 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, and includes a glass tube (bulb) 18 as an arc tube of the fluorescent lamp and a phosphor film 19 coated 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 that emits green light, and a rare earth phosphor that emits 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 tips of the inner conductors 21. A base 23 is attached to the end of the glass tube 18, and the base 23 is electrically connected to the inner conductor 21. In addition, although the straight tube configuration is shown here, the configuration is not limited to this, and a tubular fluorescent lamp or another structure may be used. The arc tube of the fluorescent lamp is not limited to the glass tube, and a tube made of highly transparent ceramic (translucent ceramic tube) may be used.

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

The experimental apparatus shown in FIG. 3 has a black light-shielding mask 6 placed in front of the subject 5, a light source (a) 8, a light source (b) 9, and a light source ( c) 10 is provided. The light-shielding mask 6 is provided with an observation light emitting unit 7 having a visual dimension of 2 degrees at a 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], and 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], 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 controlled by the reflector 11 so that the light can be sufficiently mixed.
Table 1 below shows the light sources (a) 8 and (b) used in this experiment.
9 and (c) 10 show x and y chromaticity values.

[0032]

[Table 1]

Each of the light sources (a) 8, (b) 9, and (c) 10 is connected to the computer 12 via the control unit 13.
Connected to the light sources (a) 8, (b) 9, and (c) 1
The light output of 0 can be varied via the control unit 13 independently according to the signal 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 control the light source (c).
Only the light output of 10 can be freely changed. In this experiment, light sources (d), (e), and (f) were used in which the luminous flux ratio [%] between the light sources (a) 8 and (b) 9 was 96: 4, 95: 5, and 93: 7. I decided. Table 2 below
The x and y chromaticity values of the light sources (d), (e) and (f) are shown in FIG.

[0034]

[Table 2]

In this experiment, the light sources (d), (e), (f)
Are randomly presented to the observation light emitting unit 7, and then the subject 5
Light from the light source (c) 10 is additionally mixed until it starts to feel white, thereby causing 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 3 times. Table 3 below shows the light sources (a) 8, (b) 9, where the three subjects start to feel white.
(C) The average value of the luminous flux ratio [%] of 10 (upper row of each row) is shown, and the lower standard of each row in Table 3 shows the standard deviation between subjects. The light sources (g), (h), and (i) are light sources having a luminous 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 source (d), and similarly, the light source (h) is obtained by adding light from the light source (c) 10 to 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 showing the variation of the results of this experiment is small, the light sources (g), (h),
It can be said that (i) has a chromaticity at which all subjects begin to feel white. Square points in FIG. 1 are plots of x and y chromaticity values of light sources (g), (h), and (i), and line segments A to D in FIG. 1 are light sources (g) and
Regression line (y) obtained from x and y chromaticity values of (h) and (i)
= 0.98x + 0.097). Light source (g),
Since (h) and (i) have chromaticity at which all the subjects start to feel white, therefore, by using the light source color in the shaded area in FIG. 1, there is no tint of the light source color. It is possible to realize a fluorescent lamp with a whiter appearance.

Next, a phosphor that realizes the light source color of the fluorescent lamp of this embodiment will be described.

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

FIG. 4 shows 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) is changed. Chromaticity values are shown. The light color of the calcium halophosphate phosphor (D) is daylight and the composition of the phosphor is 3
Ca ₃ (PO ₄ ) ₂ · Ca (F, Cl) ₂ : Sb, Mn is a phosphor. In FIG. 4, 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) to (III) are the chromaticity values of the light source color of the monochromatic fluorescent lamp by the phosphors of LAP, YOX, and D.

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

As can be seen from FIG. 4, the white light color (daylight) calcium halophosphate phosphor (D) shows little change in the chromaticity value of the light source color with an increase in the weight ratio [%]. On the other hand, a rare earth phosphor (YO
In X), the change in the chromaticity value of the light source color is large with respect to the increase in the weight ratio [%]. That is, 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 color mixture is established in mixed light, and thus light having a strong tint is more likely to affect changes in chromaticity values. This is true for the rare earth phosphors that emit blue light as well as the rare earth phosphors that emit red light.

Therefore, a rare earth fluorescent substance that emits blue light or a rare earth fluorescent substance that emits red light that enables a large change in chromaticity value with a small amount, and a rare earth fluorescent substance that emits green light with 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 keeping the weight ratio [%] of the calcium halophosphate phosphor high.

It is possible to realize the chromaticity values in the shaded chromaticity region shown in FIG. 1 by using a small amount of calcium halophosphate phosphor in the above-mentioned phosphor structure. Inexpensive fluorescent lamps cannot be provided. In order to realize an inexpensive fluorescent lamp, at least 50% by weight of calcium halophosphate phosphor is used.
It is required to have a configuration including the above.

In order to realize an inexpensive fluorescent lamp, if the amount of the calcium halophosphate phosphor to be prepared 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 is also reduced. Luminous efficiency of fluorescent lamp [lm / W]
In order to differentiate the conventional fluorescent lamp for general lighting 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 required. It is required to be realized. Therefore,
The inventors of the present application have found that the rare earth phosphor (LAP) that emits green light.
A 40 W straight tube fluorescent lamp was produced by changing the weight ratio [%] between the calcium halophosphate phosphor (D) and the optimum luminous flux ratio [%] range of the calcium halophosphate phosphor. It is known that the addition of a very small amount of rare earth phosphor that emits blue or red has the effect of improving the luminous efficiency [lm / W]. Therefore, the optimum luminous flux ratio [%] obtained from this prototype lamp The lower limit value of the range is established as an approximation of the lower limit value of the range of the optimum luminous flux ratio [%] of the configuration including the rare earth phosphor that emits green light, the calcium halophosphate phosphor, and the rare earth phosphor that emits blue or red light.

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

Since this calcium halophosphate phosphor uses antimony (Sb) and manganese (Mn) as activators, daylight color (D) and neutral white (N) can be obtained by changing the ratio of both activators. , 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 the daylight color (D).
As a result, in order to set the weight ratio to 50% or more,
Luminous flux ratio [%] is 27 for neutral white (N)
[%], 29 (%) for white (W) and 28 [%] or more for warm white (WW). Therefore, in order to set the weight ratio of the calcium halophosphate phosphor to 50 [%] or more, the light flux ratio of the calcium halophosphate phosphor may be set to 30 [%] or more in consideration of the variation of the prototype lamp.

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

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

FIG. 7 shows chromaticity values of light source colors in various light sources in which the combination of phosphors of a 40 W straight tube fluorescent lamp is changed. The chromaticity region 1 in FIG. 7 corresponds to the shaded area shown in FIG.

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

Further, (r) in FIG. 7 indicates LAP and BAT.
Luminous flux ratio LAP: BAT = 98: 2
The chromaticity value of the light source color of the fluorescent lamp prepared to be [%] is shown. In this way, the chromaticity value of the light source color of the fluorescent lamp prepared by mixing the two types of phosphors should be located on the line segment (I)-(VII) connecting the chromaticity values of the light source color of the respective monochromatic fluorescent lamps. become. Therefore, rare earth phosphor: LAP
And 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 is within the range surrounded by the curve connecting (III) to (VI).

Curves (p) and (q) connect the chromaticity values of the light source color which gives a luminous efficiency of 90 [lm / W] in various light sources in which the combination of the phosphors of the 40 W straight tube fluorescent lamp is changed. A curve is shown. Curve (p) shows rare earth phosphor: LAP and calcium halophosphate phosphor: D, N,
It is the curve which connected the chromaticity value of the light source color of each fluorescent lamp which becomes luminous efficiency 90 [lm / W] about the fluorescent lamp comprised by each combination of 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 luminous flux ratio LAP: BAT = 98: 2 [%] and a fluorescent lamp composed of a combination of a phosphor and a calcium halophosphate phosphor (D, N, W, WW). Efficiency 90 [lm / W]
Is a curve connecting the chromaticity values of the light source colors of the respective fluorescent lamps.

A fluorescent lamp composed of these phosphors is a rare earth phosphor (L / L) having a high luminous efficiency [lm / W].
The higher the ratio of (AP), the higher the luminous efficiency [lm / W] of the fluorescent lamp. Therefore, the fluorescent lamp showing the chromaticity value in the upper region (closer to the LAP) of the curves (p) and (q) has a luminous efficiency [lm / W] higher than 90 [lm / W].
W] and the fluorescent lamp showing the chromaticity value in 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, WW) combination fluorescent lamp is 90
A high luminous efficiency [lm / W] of [lm / W] or more can be realized. In other words, the fluorescent lamp of the present embodiment, which is 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, a fluorescent lamp using a combination of LAP and a calcium halophosphate phosphor (D, N, W, WW) cannot achieve 90 [lm / W],
It becomes less than 90 [lm / W].

Therefore, a rare earth phosphor (LAP) emitting green light and a calcium halophosphate phosphor (D, N,
W, WW) and a rare earth phosphor (BA) that emits green light and a rare earth phosphor (BA that emits blue light)
T) and calcium halophosphate phosphor (D, N, W, W
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 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 used.
It is preferable to make the compounding amount of (1) or less the compounding amount of (s) in FIG. Since (s) shows the chromaticity value of the light source color of the fluorescent lamp prepared so that the luminous flux ratio of LAP and BAT (LAP: BAT) is 85:15 [%], the luminous flux ratio of BAT is 15 From the viewpoint of the mixing accuracy of the phosphor, it may be 0.1% or more. That is, BA
The luminous flux ratio of T is 0.1 to 15 [%], and the rest is L
It may be prepared so that the luminous flux ratio of AP (that is, 99.9 to 85 [%]) is obtained.

When the luminous flux ratio [%] is converted into a luminous flux ratio [%] including the light emission of the calcium halophosphate phosphor, the luminous flux ratios of the two kinds of rare earth phosphors to the calcium halophosphate phosphor are 10 to 70 [%]. Therefore, B
The luminous flux ratio of AT is 0.01 to 10.5 [%].
Therefore, only a small amount of rare earth phosphor that emits blue light,
By adding it to the rare earth fluorescent substance and the calcium halophosphate fluorescent substance that emit green light, it is possible to realize an inexpensive fluorescent lamp with high luminous efficiency [lm / W] without substantially changing the amount of the calcium halophosphate fluorescent substance. .

Calcium halophosphate phosphor (II
By blending both I) D and (IV) N, any chromaticity value on the line segments (III)-(IV) can be achieved. Furthermore, calcium halophosphate phosphor (III)
By blending D ~ (VI) WW, the curve (III)
Any chromaticity value on ~ (VI) can be realized. Therefore, line segment (r)-(III) and 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 calcium halophosphate phosphor (D, N, W, WW). This can be achieved by changing the ratio.

Although the BAT phosphor having a strong blue tint is used in the above-mentioned embodiment, the SCA phosphor used in the experiment for obtaining the white-sensed region and the composition of the phosphor are BaM.
gAl ₁₀ O _17: Eu, may be used a phosphor is Mn.

Next, a rare earth phosphor (LA
A combination of P), 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 color of the same monochromatic fluorescent lamp as in FIG. (U)
Is the luminous 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 LAP and YOX are prepared so that the luminous flux ratio LAP: YOX = 50: 50 [%]. The chromaticity value of the light source color of the fluorescent lamp is shown.

Curves (p) and (t) are curves connecting the chromaticity values of the light source color that gives a luminous efficiency of 90 [lm / W] in a 40 W straight tube fluorescent lamp with a different combination of phosphors. ing. The curve (p) is a curve connecting the chromaticity values of the light source color by the same combination of the phosphors as in FIG. 7. On the other hand, the curve (t) shows the luminous flux ratio LAP: YOX = 90: 10 between the rare earth phosphor (LAP) and the rare earth phosphor (YOX).
It is a curve that connects the chromaticity values of the light source colors obtained by combining the mixed phosphors mixed so as to be [%] and the calcium halophosphate phosphors (D, N, W, WW).

Similar to FIG. 7, in FIG. 8 as well, 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 has the higher luminescent efficiency. It will be lower. As can be seen in FIG. 8, the curve (t) is below the curve (p) and therefore the LAP and the calcium halophosphate phosphor (D,
N, W, WW) rather than a combination of LAP and YOX
And calcium halophosphate phosphor (D, N, W, WW)
With the combination of with the same light source color, luminous efficiency [lm /
It is possible to realize a fluorescent lamp having a high W].

Further, a rare earth phosphor (YO which emits red light)
The compounding amount of X) is less than or equal to the compounding amount of (v) in order to set the chromaticity value of the light source color in the fluorescent lamp in the configuration of the two kinds of rare earth phosphors and calcium halophosphate phosphor within the chromaticity region 1. Is preferred. (V) is LA
The luminous flux ratio (LAP: YOX) between P and 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 50
[%] Or less, and 0.1 from the viewpoint of phosphor preparation accuracy.
It may be set to [%] or more. That is, the light flux ratio of YOX may be set to 0.1 to 50 [%], and the rest may be adjusted to be the light flux ratio of LAP (that is, 99.9 to 50 [%]).

When the luminous flux ratio [%] is converted into a luminous flux ratio [%] including the light emission of the calcium halophosphate phosphor, the luminous flux ratios of the two kinds of rare earth phosphors to the calcium halophosphate phosphor are 10 to 70 [%]. Therefore, Y
The luminous flux ratio of OX is 0.01 to 35 [%]. Therefore, by adding a small amount of a rare earth phosphor (YOX) that emits red light to a rare earth phosphor and a calcium halophosphate phosphor that emits green light, high luminous efficiency [lm / W] makes it possible to realize an inexpensive fluorescent lamp.

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
The chromaticity value (x, y) of the light source color is in the range surrounded by (0.343, 0.433), and the antimony-manganese-activated calcium halophosphate phosphor, the rare-earth phosphor that emits green light, and blue or red Since it has a phosphor mixture containing a mixture of rare-earth phosphors that emits in the inside of the glass tube, it is possible to distinguish the minimum color, and in addition, there is a white appearance and fluorescence with high emission efficiency. The lamp
The fluorescent lamp can be provided with almost no increase in price. That is, it is possible to realize a fluorescent lamp with high efficiency and white color at a low price.

[Brief description of 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 showing an example of the configuration of the fluorescent lamp according to the present embodiment.

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

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

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

FIG. 6 is a graph showing the relationship between the luminous flux ratio and the light emission ratio with the 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.

[Explanation of symbols]

5 subjects 6 Shading mask 7 Observation light emitting part 8 Light source (a): LAP 9 Light source (b): SCA 10 Light source (c): YOX 11 reflector 12 computers 13 Control unit 14 Adjustment knob 18 glass tube (bulb) 19 Phosphor film (phosphor) 20 stems 21 Inner conductor 22 filament 23 Clasp

─────────────────────────────────────────────────── ─── Continued Front Page (72) Yoshinori Tanabe Yoshinori Tanabe 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-58-61554 (JP, A) JP-A-58- 59550 (JP, A) JP 56-152151 (JP, A) JP 59-205145 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 61/44 C09K 11 / 08 C09K 11/73 CPX C09K 11/78 CPB C09K 11/81 CPW

Claims (8)

(57) [Claims] 1. A 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), which comprises an antimony-manganese-activated calcium halophosphate phosphor, a rare-earth phosphor that emits green light, and a rare-earth phosphor that emits blue or red light. A fluorescent lamp having a phosphor mixture containing and on the inner surface of an arc tube. 2. The chromaticity value (x, x of the light source color of the fluorescent lamp is set in a region where DUV is on the plus side 10 or more in the range surrounded by the points A, B, C and D.
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
The fluorescent lamp according to claim 1, wherein the chromaticity value (x, y) of the light source color of the fluorescent lamp is in an area excluding the chromaticity range of the light color section of the fluorescent lamp of IS Z9112. 4. The chromaticity value (x) of the light source color of the fluorescent lamp is set in an area having a correlated color temperature of 4000 Kelvin [K] or higher in the range surrounded by the points A, B, C and D. , Y) according to any one of claims 1 to 3. 5. A luminous flux by the light emission of the antimony-manganese activated calcium halophosphate phosphor is a luminous flux a, and a luminous flux by the emission of the rare earth phosphor whose emission spectrum peak wavelength is in the range of 420 to 470 [nm], When the sum of the light flux due to the light emission of the rare earth phosphor whose peak wavelength of the emission spectrum is 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. It is -90 [%], and the said luminous flux b occupies the remainder, The fluorescent lamp in any one of Claims 1-4. 6. The peak wavelength of the emission spectrum is 42.
The luminous flux of the rare earth phosphor in the range of 0 to 470 [nm] is defined as luminous flux c, and the peak wavelength of the luminous spectrum is 5
When the luminous flux of the emission intensity of the rare earth phosphor in the range of 30 to 580 [nm] is defined as the luminous flux d, the ratio of the luminous flux c to the luminous flux b is 0.1 to 15.
It is [%], and the said luminous flux d occupies the remainder, The fluorescent lamp of Claim 5. 7. A luminous flux of light emitted from the antimony-manganese-activated calcium halophosphate phosphor is a luminous flux e, and a luminous flux 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 having a 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. It is -90 [%], and the said luminous flux f occupies the remainder, The fluorescent lamp in any one of Claims 1-4. 8. The peak wavelength of the emission spectrum is 53.
The luminous flux of the emission intensity of the rare earth phosphor in the range of 0 to 580 [nm] is defined as a luminous flux g, and the luminous flux of the emission intensity of the rare earth phosphor in which the peak wavelength of the emission spectrum is in the range of 600 to 650 [nm]. Where the luminous flux h is 0.1 to 50, the ratio of the luminous flux h to the luminous flux f is 0.1 to 50.
It is [%], and the said luminous flux g occupies the remainder, The fluorescent lamp of Claim 7.