JP2002203519A - Fluorescent type metal halide lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a correlated color temperature close to a transparent form without having a fluorescent film, and improve the correlated color temperature of a fluorescent type metal halide lamp of Sc-Na in the fluorescent type metal halide lamp. SOLUTION: The fluorescent type metal halide lamp 1 has a light emitting tube 2 wherein a pair of electrodes 2b, 2c are arranged inside and wherein metal halide, mercury and rare gas are enclosed, an outer tube 3 composed of a light-permeating material to house this light-emitting tube 2, and a fluorescent film 8 formed on the inner surface of the outer tube 3 in order to receive and disperse the light irradiated from the light-emitting tube 2. The fluorescent film 8 is formed by a mixed fluorescent body to include the first fluorescent body having at least blue or bluish green color light emission and the second fluorescent body having red color light emission. Such a fluorescent type metal halide lamp 1 has the correlated color temperature of 3,800 K or more.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent metal halide lamp.

[0002]

2. Description of the Related Art Metal halide lamps have improved luminous efficiency and color rendering properties by encapsulating various metal halides together with mercury and a rare gas in an arc tube. As described above, metal halide lamps have characteristics such as high efficiency and high color rendering properties, and are therefore widely used for general lighting such as store lighting and road lighting.

In general, a metal halide lamp uses an arc tube together with a pulse generator in an outer tube. In such a metal halide lamp, when the outer tube is transparent, the light from the arc tube directly hits the eyes, so that it may look very dazzling or unpleasant. Therefore, a fluorescent metal halide lamp having a fluorescent film formed on the inner surface of the outer tube or the like is used.

In such a fluorescent metal halide lamp, not only the light emitted from the arc tube is diffused by the fluorescent film to greatly reduce the glare, but also the light emitted directly from the arc tube is reduced by the fluorescent film. Since light from the light source is added, luminous efficiency and color rendering can be further improved. In a conventional fluorescent metal halide lamp, in order to suppress a decrease in luminance and further enhance luminous efficiency, it is common to form a fluorescent film by applying a phosphor powder having red light emission to the inner surface of an outer tube. Was.

That is, since a metal halide lamp emits light containing a large amount of yellow-green light peculiar to the mercury spectrum, by including red light from a phosphor film formed of a red light-emitting phosphor, not only the luminous efficiency but also the luminous efficiency is increased. Color rendering can also be improved. For example, Japanese Patent Application Laid-Open No. 9-213276 discloses a mixed phosphor of a europium-activated yttrium vanadate phosphor having red emission and a manganese-activated fluorogermanate phosphor having deep red emission, which is provided outside a metal halide lamp. It describes that a fluorescent film is formed on the inner surface of the tube, thereby increasing the luminous efficiency and improving the color rendering index.

[0006]

However, in the conventional fluorescent metal halide lamp, since the fluorescent film is mainly formed of a red light emitting phosphor as described above, the lamp correlated color temperature is lower than that of the transparent type. It often happens. In particular, this tendency is remarkable in a metal halide lamp using scandium halide and sodium halide as an enclosure in an arc tube, that is, a so-called Sc-Na-based metal halide lamp. As described above, the conventional fluorescent metal halide lamp has a problem that the correlated color temperature of the lamp is changed and particularly lowered as compared with the transparent type due to the presence of the fluorescent film.

[0007] Since metal halide lamps have been widely used in commercial spaces and the like, they are often used for applications such as arranging a plurality of lamps on one plane in an indoor facility or the like, and a light distribution design. From the point of view, the transparent type and the fluorescent type (diffusion type) may be used at the same time. In such a usage form of the metal halide lamp, if the correlated color temperature of the fluorescent metal halide lamp is lower than that of the transparent type,
Various problems arise from the point of light distribution design and the like.

Further, the required characteristics of metal halide lamps have also been various, and recently, metal halide lamps having a high lamp correlated color temperature tend to be preferred. Therefore, it is desired to increase the lamp correlated color temperature of the fluorescent metal halide lamp.

SUMMARY OF THE INVENTION The present invention has been made to address such a problem, and has a lamp characteristic such as luminous efficiency and color rendering that is equal to or higher than that of a transparent type, and has a fluorescent film having a lamp correlated color temperature. It is an object of the present invention to provide a fluorescent metal halide lamp which is similar to a transparent type which is not used, and a Sc-Na based fluorescent metal halide lamp which has an improved lamp correlated color temperature.

[0010]

According to the first aspect of the present invention, a first fluorescent metal halide lamp according to the present invention has a pair of electrodes disposed therein and at least a metal halide and mercury sealed therein. A light-emitting tube, an outer tube made of a translucent material in which the light-emitting tube is housed, and a fluorescent film disposed in the outer tube so as to receive and diffuse light emitted from the light-emitting tube. In the above-described fluorescent metal halide lamp, the fluorescent film includes at least a first phosphor that emits blue or blue-green light and a second phosphor that emits red light.

In the first fluorescent metal halide lamp, the fluorescent film may be mixed so that the lamp correlated color temperature of the fluorescent type is close to that of the transparent type having no fluorescent film. It is characterized by including a mixture of the first phosphor and the second phosphor whose ratio is adjusted.

In the second fluorescent metal halide lamp according to the present invention, a pair of electrodes are disposed inside and at least scandium halide, sodium halide and mercury are sealed. A light-emitting tube, an outer tube made of a translucent material in which the light-emitting tube is housed, and a fluorescent film disposed in the outer tube so as to receive and diffuse light emitted from the light-emitting tube. In the above-described fluorescent metal halide lamp, the fluorescent film includes at least a first phosphor having blue or blue-green emission and a second phosphor having red emission, and has a lamp correlated color temperature of 3800 K or more. Features.

In the fluorescent metal halide lamp according to the present invention, the fluorescent film for receiving and diffusing light emitted from the arc tube includes a first phosphor having at least blue or blue-green emission and a second phosphor having red emission. It is formed of a mixed phosphor containing a phosphor. By using such a mixed phosphor of the first phosphor and the second phosphor and adjusting the mixing ratio thereof, the lamp correlated color temperature can be changed. The first according to the material of the
By applying the mixture ratio of the phosphor and the second phosphor, the lamp correlated color temperature of the fluorescent metal halide lamp can be approximated to a transparent type.

Further, the lamp correlated color temperature of the fluorescent metal halide lamp can be increased depending on the mixing ratio of the first phosphor and the second phosphor. Therefore, by appropriately setting the mixture ratio of the first phosphor and the second phosphor, specifically, by setting the mixture ratio of the first phosphor having blue or blue-green emission to be higher, the lamp can be increased. Correlated color temperature
It is possible to obtain a fluorescent metal halide lamp of 3800K or more, and a fluorescent metal halide lamp having a lamp correlated color temperature higher than that of a transparent type.

In the fluorescent metal halide lamp according to the present invention, the fluorescent film is formed, for example, on the inner surface of the outer tube. However, the position at which the fluorescent film is formed is not limited to this. For example, as described in claim 5, when a middle cylinder is provided, it may be formed on the inner surface or outer surface thereof.

Further, in the fluorescent metal halide lamp according to the present invention, as the first phosphor, the x value of the xy chromaticity coordinate is in the range of 0.14 to 0.30, y
It is preferable to use a blue or blue-green light emitting phosphor having a light emission color in the range of 0.14 to 0.35, and the x value of the xy chromaticity coordinate is in the range of 0.53 to 0.73 as the second phosphor.
It is preferable to use a phosphor that emits red light having an emission color in the range of 0.25 to 0.40. By using such a phosphor, the lamp correlated color temperature of the fluorescent metal halide lamp can be controlled even better.

In the fluorescent metal halide lamp according to the present invention, in addition to the phosphor emitting blue or blue-green light and the phosphor emitting red light,
For example, a phosphor having deep red emission according to claim 8,
Further, the phosphor having green light emission described in claim 9 may be contained. By using such a mixed phosphor, the chromaticity deviation of the metal halide lamp can be corrected, and for example, the chromaticity deviation can be made closer to the vicinity of the BBL.

[0018]

Embodiments of the present invention will be described below.

FIG. 1 is a view showing the structure of a fluorescent metal halide lamp 1 according to one embodiment of the present invention. The fluorescent metal halide lamp 1 shown in FIG.
An arc tube 2 of 13 to 19 W / cm ² is provided. The arc tube 2 has a discharge vessel 2a made of quartz glass or ceramics, and a first electrode 2b and a second electrode 2c are provided in the discharge vessel 2a.
Are arranged to face each other. The first electrode 2b and the second electrode 2c are connected to the introduction lines 2d and 2e, respectively, and are hermetically sealed by the sealing portion 2f with respect to the discharge vessel 2a. In addition, 2 g is an auxiliary electrode, and 2 h is a heat insulating film applied to the lower sealing portion 2 f.

In the discharge vessel 2a, a predetermined amount of mercury, a rare gas and a metal halide are sealed as a discharge medium, and in this state, airtightness is maintained with respect to the outside. Examples of the metal halide include scandium iodide (S
a mixture of cI ₃ ) and sodium iodide (NaI);
A mixture of dysprosium iodide (DyI ₃ ) and thallium iodide (TlI) is used. In particular, ScI
_The Sc-Na-based metal halide lamp in which ₃ and NaI are encapsulated has characteristics such as high radiation efficiency in the visible wavelength range and excellent luminous efficiency and color rendering.

The above-described arc tube 2 is housed and arranged in an outer tube 3 made of a translucent material such as hard glass. A base (E39 type base) 4 is fixed to one end of the outer tube 3. The base 4 is connected to a pair of introduction leads 4a and 4b. The base 4 has a role of energizing the arc tube 2 and a pulse generator 7 described later. In addition, an inert gas such as a nitrogen gas is sealed in the outer tube 3. Although not shown, the outer surface of the outer tube 3 is coated with, for example, a fluororesin so as to prevent the outer tube 3 from scattering at the time of a fall.

The upper and lower portions of the arc tube 2 are supported by supports 5 and 6, respectively, and are arranged at predetermined positions in the outer tube 3 in this state. The upper support 5 supports the upper portion of the arc tube 2 and electrically connects the first electrode 2b to the lead 4a, and has a frame-shaped conductor 5a and a metal band 5b. The frame-shaped conductor 5a is the first
Is electrically connected between the lead 2d of the electrode 2b and the lead 4a. The metal band 5b holds the upper part of the arc tube 2.

The upper support 5 further supports a pulse generator 7. The pulse generator 7 includes a thermally responsive switch 7
a, a lighting tube 7b and a heating resistor 7c are provided in series, and a high-voltage pulse is generated in cooperation with a ballast to start the arc tube 2. In addition, the current limiting resistance 7
d is connected, which assists in starting the arc tube 2.

The lower support 6 supports the lower portion of the arc tube 2 and electrically connects the second electrode 2c to the lead 4b. The lower support 6 includes a frame-shaped conductor 6a, a metal band 6b, and a spring piece 6c. have. The frame-shaped conductor 6a connects the introduction lead 4b to the second electrode 2c via the connection conductor 6d.
Is electrically connected to the introduction line 2e. The metal band 6b holds the lower part of the arc tube 2. Lower support 6
Has a getter 6e. The getter 6e adsorbs the impurity gas generated during the life.

In the above-described fluorescent metal halide lamp 1, a fluorescent film 8 is formed on the inner surface 3a of the outer tube 3 so as to receive and diffuse the light emitted from the arc tube 2. The fluorescent film 8 includes at least a first phosphor that emits blue or blue-green light and a second phosphor that emits red light. As described above, by forming the fluorescent film 8 with a mixture of the blue or blue-green light emitting phosphor and the red light emitting phosphor, the fluorescent film 8 is compared with the conventional fluorescent film formed only of the red light emitting phosphor. A decrease in the lamp correlated color temperature of the metal halide lamp 1 can be suppressed, and the lamp correlated color temperature can be further increased.

That is, by adjusting the mixing ratio of the blue or blue-green emitting phosphor and the red emitting phosphor in the mixed phosphor constituting the phosphor film 8, the light emitted from the arc tube 2 is Since various lights can be added according to the mixing ratio of the phosphors constituting the phosphor film 8, the lamp correlated color temperature of the fluorescent metal halide lamp 1 can be controlled. Therefore, by applying a mixing ratio of the phosphor according to the kind of the arc tube 2 and the material of the enclosure, that is, a mixing ratio of the blue or blue-green emitting phosphor and the red emitting phosphor, the fluorescent metal halide can be obtained. The lamp correlated color temperature of the lamp 1 can be approximated to a transparent shape. Further, the fluorescent metal halide lamp 1 can achieve luminous efficiency, color rendering, and the like that are equal to or higher than those of the transparent type.

Further, the lamp correlated color temperature of the fluorescent metal halide lamp 1 can be improved depending on the mixing ratio of the blue or blue-green light emitting phosphor and the red light emitting phosphor. The lamp correlated color temperature increases as the mixing ratio of the blue or blue-green emitting phosphor increases. Therefore, by applying such a mixing ratio of the phosphor emitting blue or blue-green light and the phosphor emitting red light, it is possible to easily realize a lamp correlated color temperature of 3800K or more in the fluorescent metal halide lamp 1. Becomes Further, the fluorescent metal halide lamp 1 can realize a higher lamp correlated color temperature than the transparent type.

In the fluorescent metal halide lamp 1 of the present invention, among the phosphors constituting the phosphor film 8, the first phosphor has an x value of xy chromaticity coordinates in the range of 0.14 to 0.30 and a y value of 0.14 to 0.30.
It is preferable to use a phosphor that emits blue or blue-green light having an emission color in the range of 0.14 to 0.35. For the second phosphor, the x value of the xy chromaticity coordinates is in the range of 0.53 to 0.73, and the y value is 0.
It is preferable to use a phosphor that emits red light having an emission color in the range of 25 to 0.40. By using these phosphors, the lamp correlated color temperature of the fluorescent metal halide lamp 1 can be controlled even better.

The phosphors emitting blue or blue-green light having the above-mentioned chromaticity values include europium-activated aluminate phosphors, europium- and manganese-activated aluminate phosphors, europium-activated halophosphate phosphors. body,
A europium-activated halosilicate phosphor, a copper-activated phosphate phosphor and the like are exemplified. Of these, it is particularly preferable to use europium and manganese activated aluminate phosphors and europium activated halophosphate phosphors.

The europium and manganese activated aluminate phosphor has the general formula: a (M1, Eu, Mn ) O · bAl 2 O 3 ( wherein, M1 is Mg, Ca, Sr, Ba, Zn, Li,
Represents at least one element selected from Rb and Cs, wherein a and b are a> 0, b> 0, and a number satisfying 0.2 ≦ a / b ≦ 1.5) Things.

The europium-activated halophosphate phosphor has a general formula: (M2, Eu) ₁₀ (PO ₄ ) ₆ .Cl ₂ (where M2 is at least one selected from Mg, Ca, Sr and Ba) (Indicating a kind of element).

Examples of the red-emitting phosphor having a chromaticity value as described above include europium-activated yttrium vanadate phosphor, europium-activated yttrium vanadate phosphor, and manganese-activated fluorogermanate phosphor. Is exemplified. Among these, especially YPV
It is preferable to use europium-activated yttrium vanadate phosphate phosphor represented by O ₄ : Eu. Note that the manganese-activated fluorogermanate phosphor can be used also as a deep red-emitting phosphor described below.

In the fluorescent metal halide lamp 1 of the present invention, in addition to the phosphors emitting blue or blue-green light and the phosphor emitting red light, the phosphor having deep red light emission is added to the mixed phosphor forming the phosphor film 8. Or a phosphor that emits green light. By using such a mixed phosphor, the chromaticity deviation of the fluorescent metal halide lamp 1 can be corrected, and for example, the chromaticity deviation can be made closer to the vicinity of the BBL. In particular, a phosphor emitting green light is effective for correcting the chromaticity deviation of the fluorescent metal halide lamp 1.

The phosphor emitting green light is a rare earth silicate phosphor activated with cerium and terbium (Y ₂ O ₃ .SiO
₂ : Ce, Tb, etc.), terbium-activated rare earth aluminate phosphor (Y ₂ O ₃ .Al ₂ O ₃ : Tb, etc.), cerium activated rare earth aluminate phosphor (Y ₃ Al ₅ O ₁₂ : Ce) Cerium and terbium activated rare earth phosphate phosphors (LaPO ₄ : Ce, Tb, etc.), cerium and terbium activated rare earth silicon phosphate phosphors (La ₂ O ₃ .0.2S)
iO ₂ .0.9P ₂ O ₅ : Ce, Tb, etc.). Further, as a phosphor having deep red emission, for example, a manganese-activated fluorogermanate phosphor (3.5 Mg
_{O · 0.5MgF 2 · GeO 2:} Mn , etc.) can be used.

In the fluorescent metal halide lamp of the present invention, the position where the fluorescent film 8 is formed is not limited to the inner surface of the outer tube 3 shown in the above embodiment, but is radiated from the arc tube 2 in the outer tube 3. Any position can be used as long as it can receive and diffuse the reflected light. For example, as shown in FIG. 2, when a middle tube 9 made of a quartz glass or the like is arranged around the arc tube 2, the fluorescent film 8 is formed on the inner surface or the outer surface of the middle tube 9. You may. With the fluorescent metal halide lamp 1 having such a fluorescent film 8, the same effect as in the above-described embodiment can be obtained.

The fluorescent metal halide lamp 1 shown in FIG. 2 has the same structure as the fluorescent metal halide lamp 1 shown in FIG. 1 except that it has a middle tube 9 and a fluorescent film 8 is formed on the inner surface or outer surface thereof. Have

[0037]

Next, specific examples of the present invention will be described.

Example 1 First, an example in which the present invention is applied to a 400 W type Sc-Na fluorescent metal halide lamp will be described. The inner diameter of the arc tube was 22 mm, the gap between the electrodes was 38 mm, and the enclosed ScI ₃ and NaI
Was 1: 5 (mass ratio), and the encapsulation amount was 30 mg.
The lamp correlated color temperature (hereinafter referred to as Tc) of the transparent type of the metal halide lamp is 4025K, and the color rendering index (hereinafter referred to as Rc)
a) is 59, and the chromaticity deviation (hereinafter referred to as duv.) is 59.
0.008, the total luminous flux was 42000 lm.

On the other hand, a BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn phosphor is used as a blue-green emitting phosphor (hereinafter referred to as a BG phosphor), and a red emitting phosphor (hereinafter referred to as an R phosphor). YPVO ₄ : Eu phosphor is prepared as
G phosphors and R phosphors were mixed at various mixing ratios to prepare a plurality of mixed phosphors. Here, mixed phosphors were prepared in which the mixing ratio (mass ratio) of the BG phosphor was 0%, 25%, 50%, 75%, and 100%, respectively. These mixed phosphors were mixed together with a binder and a dispersion medium, and the resulting mixture was applied to the inner surface of an outer tube to form a fluorescent film. The transmittance of the phosphor film was 70%. Each of the outer tubes having such a fluorescent film was lit using the same arc tube as the transparent type, and each characteristic was measured. The results are shown in Table 1 and FIG.

[0040]

[Table 1]

As is clear from Table 1 and FIG. 3, in the Sc-Na fluorescent metal halide lamp of Example 1, the mixing ratio of the BG phosphor to the R phosphor was 25:75.
In the case of using the mixed phosphor (mass ratio), the lamp correlated color temperature (Tc) could be made almost equal to that of the transparent type.

Embodiment 2 In Embodiment 2, an example in which the present invention is applied to a 250 W type Sc-Na fluorescent metal halide lamp will be described. The inner diameter of the arc tube was 19 mm, the distance between the electrodes was 27 mm, the mixing ratio of the enclosed ScI ₃ and NaI was 1: 7 (mass ratio), and the enclosed amount was 20 mg. The lamp correlated color temperature (Tc) of this metal halide lamp in a transparent form is 3725 K, and the color rendering index (R
a) is 60, the chromaticity deviation (duv.) is 0.008, and the total luminous flux is 2150.
0 lm.

On the other hand, a BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn phosphor is used as a blue-green emitting phosphor (BG phosphor), and a YPVO ₄ : Eu is used as a red emitting phosphor (R phosphor).
A phosphor was prepared, and a phosphor film was formed on the inner surface of the outer tube in the same manner as in Example 1 using a mixed phosphor obtained by mixing the BG phosphor and the R phosphor in the same manner as in Example 1. .
Each of the outer tubes having such a fluorescent film was lit by the same arc tube as the transparent type, and each characteristic was measured. The results are shown in Table 2 and FIG.

[0044]

[Table 2]

As is clear from Table 2 and FIG. 4, in the Sc-Na fluorescent metal halide lamp of Example 2, the mixing ratio of the BG phosphor to the R phosphor was 25:75.
In the case of using the mixed phosphor (mass ratio), the lamp correlated color temperature (Tc) could be made almost equal to that of the transparent type.

Embodiment 3 In this embodiment 3, an example in which the present invention is applied to a 400 W type Sc-Na fluorescent metal halide lamp will be described. The inner diameter of the arc tube was 22 mm, the distance between the electrodes was 36 mm, the mixing ratio of the enclosed ScI ₃ and NaI was 1: 5 (mass ratio), and the enclosed amount was 30 mg. The lamp correlated color temperature (Tc) of this metal halide lamp in a transparent form is 4025K, and the color rendering index (R
a) is 60, chromaticity deviation (duv.) is 0.005, and total luminous flux is 4380.
0 lm.

Next, a blue-green light-emitting phosphor (BG phosphor) and a red light-emitting phosphor (R phosphor) as in Example 1 are prepared, and the BG phosphor and the R phosphor are mixed in a mass ratio. Using the mixed phosphor mixed at 25:75, a phosphor film was formed on the inner surface of the outer tube in the same manner as in Example 1. Using the outer tube having such a fluorescent film, the same light emitting tube as that of the transparent type was used to light the lamp, and each characteristic was measured. Tc = 4045K, Ra = 60, du
v. = -0.003, total luminous flux = 43850 lm.

Example 4 In Example 3 described above, in addition to the blue-green light emitting phosphor (BG phosphor) and the red light emitting phosphor (R phosphor), a green light emitting phosphor (G phosphor) was used. Y ₂ O ₃ · SiO ₂ : C
A phosphor film was formed on the inner surface of the outer tube by using a mixed phosphor obtained by mixing the BG phosphor, the R phosphor, and the G phosphor at a mass ratio of 2: 1: 0.2 using the e and Tb phosphors. When the same evaluation as in Example 3 was performed using the outer tube having such a fluorescent film, Tc = 4060K, Ra = 60, and duv. = 0.002, total luminous flux = 44250 lm.

As described above, by using a green-emitting phosphor (G phosphor) in addition to a blue-green-emitting phosphor (BG phosphor) and a red-emitting phosphor (R phosphor), a transparent material is obtained. After obtaining a lamp-correlated color temperature equivalent to the shape,
It was confirmed that it was possible to approach the vicinity of BL.

Fifth Embodiment In the third embodiment, in addition to the blue-green phosphor (BG phosphor) and the red phosphor (R phosphor), a deep red phosphor (DR phosphor) is used. 3.5MgO.0.5M
Using a gF ₂ · GeO ₂ : Mn phosphor, a phosphor film is formed on the inner surface of the outer tube by a mixed phosphor obtained by mixing the BG phosphor, the R phosphor and the DR phosphor at a mass ratio of 3: 1: 1. Formed. When the same evaluation as in Example 3 was performed using the outer tube having such a fluorescent film, Tc = 4000 K, Ra = 63, and du.
v. = 0.001 and the total luminous flux = 41850 lm.

As described above, by using a phosphor emitting deep red light (DR phosphor) in addition to a phosphor emitting blue green light (BG phosphor) and a phosphor emitting red light (R phosphor),
It was confirmed that after obtaining a lamp-correlated color temperature equivalent to that of the transparent type, the chromaticity deviation could be brought close to the vicinity of the BBL, and the color rendering index could be further increased.

Embodiment 6 This embodiment 6 shows an example in which the present invention is applied to a 400 W type Dy-Tl fluorescent metal halide lamp. In the transparent form of this Dy-Tl metal halide lamp, the lamp correlated color temperature (Tc) was 6000 K, the color rendering index (Ra) was 92.6, the chromaticity deviation (duv.) Was 0.0049, and the total luminous flux was 30100 lm. .

Next, BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn
A phosphor (BG phosphor) and a YPVO ₄ : Eu phosphor (R phosphor) were mixed at a mass ratio of 3: 2, and a phosphor film was formed on the inner surface of the outer tube using the mixed phosphor. Using the outer tube having such a fluorescent film, the lamp was lit with the same luminous tube as the transparent type, and each characteristic was measured. As a result, Tc was 6000K.
In the case of a phosphor film formed of only the R phosphor, Tc is 5600K.
Down to

Embodiment 7 Here, an example in which the present invention is applied to a 400 W type Sc-Na fluorescent metal halide lamp will be described. The inner diameter of the arc tube is 36 mm, the distance between the electrodes is 38 mm, and the enclosed ScI ₃ and N
The mixing ratio with aI was 1: 5 (mass ratio), and the amount of inclusion was 30 mg. The lamp correlated color temperature (Tc) of the Sc-Na-based metal halide lamp in a transparent form is 4070 K, and the color rendering index (R
a) is 59, chromaticity deviation (duv.) is 0.008, and total luminous flux is 4060.
0 lm.

Next, BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn
The phosphor (BG phosphor) and the YPVO ₄ : Eu phosphor (R phosphor) were mixed at a mixing ratio of 25 wt.
%, 33%, and 50%. Using each of these mixed phosphors, a phosphor film was formed on the inner surface of the outer tube in the same manner as in Example 1. Each of the outer tubes having such a fluorescent film was lit by the same arc tube as the transparent type, and each characteristic was measured. Table 3 shows the results.

[0056]

[Table 3]

As apparent from Table 3, each of the Sc—Na-based fluorescent metal halide lamps according to Example 7 has a lamp correlated color temperature (Tc) of 3800 K or more, and further has a BG phosphor. When a mixed phosphor having a blending ratio of 50% was used, a lamp correlated color temperature (Tc) exceeding the transparent type was obtained.

Embodiment 8 Here, an example in which the present invention is applied to a 250 W type Sc-Na fluorescent metal halide lamp will be described. The mixing ratio of the enclosed ScI ₃ and NaI was 1: 7 (mass ratio), and the amount of the enclosed was 20 mg. The transparent color of this Sc-Na-based metal halide lamp had a lamp correlated color temperature (Tc) of 3760 K, a color rendering index (Ra) of 60, a chromaticity deviation (duv.) Of 0.008, and a total luminous flux of 21300 lm.

Next, BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn
The phosphor (BG phosphor) and the YPVO ₄ : Eu phosphor (R phosphor) were mixed at a mixing ratio of 25 wt.
%, 33%, and 50%. Using each of these mixed phosphors, a phosphor film was formed on the inner surface of the outer tube in the same manner as in Example 1. Each of the outer tubes having such a fluorescent film was lit by the same arc tube as the transparent type, and each characteristic was measured. Table 4 shows the results.

[0060]

[Table 4]

As is clear from Table 4, each of the Sc—Na-based fluorescent metal halide lamps using the mixed phosphor having a blending ratio of the BG phosphor of 33% or more has a lamp correlated color temperature (T
c) was 3800K or more, and all had a lamp correlated color temperature (Tc) exceeding that of the transparent type.

Embodiment 9 Here, an example in which the present invention is applied to a 400 W type Sc-Na fluorescent metal halide lamp will be described. The inner diameter of the arc tube is 36 mm, the distance between the electrodes is 38 mm, and the enclosed ScI ₃ and N
The mixing ratio with aI was 1: 5 (mass ratio), and the amount of inclusion was 30 mg. The lamp correlated color temperature (Tc) of the Sc-Na-based metal halide lamp in a transparent form is 4040K, and the color rendering index (R
a) is 61, chromaticity deviation (duv.) is 0.003, and total luminous flux is 4090.
0 lm.

Next, BaMg ₂ Al ₁₆ O ₂₇ : Eu, Mn
Phosphor (BG phosphor), YPVO ₄ : Eu phosphor (R phosphor), Y ₂ O ₃ .SiO ₂ : Ce, Tb phosphor (G phosphor), and 3.5MgO.0.5MgF ₂ .GeO ₂ : A Mn phosphor (DR phosphor) is prepared, and a mixed phosphor obtained by mixing a BG phosphor and an R phosphor at a mass ratio of 1: 1, and a BG phosphor, an R phosphor, and a G phosphor at a mass ratio of 1: A mixed phosphor mixed at 2: 0.2, a BG phosphor, an R phosphor, and a DR phosphor in a mass ratio of 1: 2:
Each mixed phosphor mixed at 0.2 was prepared. A fluorescent film is formed on the inner surface of the outer tube using each of these mixed phosphors,
Further, each of the characteristics was measured by lighting with the same arc tube as the transparent type. Table 5 shows the results.

[0064]

[Table 5]

[0065]

As described above, according to the present invention,
Fluorescent metal halide lamps that have lamp characteristics such as luminous efficiency and color rendering properties that are equal to or higher than those of the transparent type, and whose lamp-correlated color temperature approximates the transparent type, and fluorescent-type metal halides that have an improved lamp-correlated color temperature It is possible to provide a lamp.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a fluorescent metal halide lamp according to an embodiment of the present invention.

FIG. 2 is a view showing a modification of the fluorescent metal halide lamp shown in FIG.

FIG. 3 is a diagram showing characteristics of the fluorescent metal halide lamp according to the first embodiment of the present invention.

FIG. 4 is a diagram showing characteristics of a fluorescent metal halide lamp according to Embodiment 2 of the present invention.

[Explanation of symbols]

1. Fluorescent metal halide lamp, 2. Arc tube, 3
... outer tube, 4 ... base, 7 ... pulse generator, 8 ... fluorescent film

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C09K 11/79 CPR C09K 11/79 CPR 11/83 CQA 11/83 CQA H01J 61/34 H01J 61/34 C 61/44 61/44 CF term (reference) 4H001 CA02 CA05 CA07 XA03 XA08 XA09 XA12 XA13 XA14 XA15 XA17 XA20 XA23 XA30 XA32 XA37 XA38 XA39 XA55 XA56 YA25 YA58 YA63 YA65 5C043 AA02 EB02 EC03

Claims (9)

[Claims] An arc tube in which a pair of electrodes are arranged and at least a metal halide and mercury are sealed;
An outer tube made of a translucent material in which the arc tube is housed, so as to receive and diffuse light emitted from the arc tube,
In the fluorescent metal halide lamp including a fluorescent film disposed in the outer tube, the fluorescent film includes at least a first phosphor that emits blue or blue-green light and a second phosphor that emits red light. A fluorescent metal halide lamp characterized in that: 2. The first fluorescent material and the second fluorescent material, the mixture ratio of which is adjusted such that a lamp correlated color temperature of the fluorescent type is close to that of a transparent type having no fluorescent film. 2. The fluorescent metal halide lamp according to claim 1, comprising a mixture with a body. 3. An arc tube in which a pair of electrodes are disposed and in which at least scandium halide, sodium halide and mercury are sealed, and an outer tube made of a translucent material in which the arc tube is accommodated. A fluorescent metal halide lamp comprising: a fluorescent film disposed in the outer tube so as to receive and diffuse the light emitted from the arc tube. A fluorescent metal halide lamp comprising: the first phosphor and a second phosphor having red light emission; and a lamp correlated color temperature of 3800 K or more. 4. The fluorescent metal halide lamp according to claim 1, wherein said fluorescent film is formed on an inner surface of said outer tube. 5. The metal halide lamp according to claim 1, further comprising a middle tube disposed around the arc tube, and wherein the fluorescent film is formed on a surface of the middle tube. The fluorescent metal halide lamp according to claim 1. 6. The first phosphor has an xy chromaticity coordinate of x.
The second phosphor has a luminescent color having a value in the range of 0.14 to 0.30 and a y value in the range of 0.14 to 0.35, and the second phosphor has an xy chromaticity coordinate of x.
The fluorescent metal halide lamp according to any one of claims 1 to 5, wherein the fluorescent metal halide lamp has an emission color having a value in a range of 0.53 to 0.73 and a y value in a range of 0.25 to 0.40. 7. The first phosphor comprises at least one selected from europium and manganese activated aluminate phosphors and europium activated halophosphate phosphors, and the second phosphor is europium activated phosphor. 7. A fluorescent metal halide lamp according to claim 6, comprising a yttrium vanadate phosphate phosphor. 8. The fluorescent metal halide lamp according to claim 1, wherein the fluorescent film further includes a fluorescent substance emitting deep red light. 9. The fluorescent metal halide lamp according to claim 1, wherein the fluorescent film further includes a fluorescent material that emits green light.