JPH06243841A - High pressure discharge lamp - Google Patents

Abstract

PURPOSE:To improve the color rendering as well as to improve the color shade of a light mixing lighting, and to reduce the cost, by housing and unifying a high pressure sodium lamp and a high pressure mercury lamp in an outer tube to which a blue green phosphor is applied CONSTITUTION:Inside an outer tube 2 to which a phosphor 3 emitting the main lighting in the scope of the wave length 400nm to 550nm, a high pressure mercury lamp luminous tube 1a and a high pressure sodium lamp luminous tube 1b are housed, and lighted simultaneously. In this case, the contributing ratio of the light emission of the phosphor excited by the high pressure mercury lamp 1a to the whole light flux is made in the scope 0.2 to 0.6. By applying a blue green phosphor to the inner side of the outer tube housing different sorts of lamps for light mixing lighting purpose integrally, a color shade resulting from a light scattering effect of the phosphor membrane can be reduced as well as the color rendering is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-pressure discharge lamp in which a plurality of different types of high-pressure discharge lamps are combined into one lamp to supply mixed lighting having uniform light distribution characteristics to factories, sports facilities and the like.

[0002]

2. Description of the Related Art In the conventional mixed light illumination in which a single type of different lamps are combined, they are arranged in a matrix in a wide space, while in a relatively narrow space, they are placed in a lighting fixture for two lights to perform illumination. . According to this method, a uniform light color is maintained on the axis of symmetry of the lamp, but unevenness of the light color occurs when it is off the axis.

Further, in a conventional high pressure discharge lamp having a plurality of inner tubes, as shown in Japanese Patent Application Laid-Open No. 4-51452, the same kind of arc tube is switched by a bimetal switch to discharge each time the lamp is lit, and the lamp is momentarily lit immediately after being turned off. Or to extend the life of the lamp, use different types of arc tubes to light one by one,
The purpose was to change the light color. 52-10
As disclosed in Japanese Patent No. 2867, a lamp for mixed light illumination has been attempted, which is configured by connecting arc tubes of a high pressure sodium lamp and a high pressure mercury lamp in series. Since the color rendering of the mercury lamp was improved, it was not commercialized.

[0004]

Conventionally, mixed light illumination has been performed by combining a plurality of single lamps. In this case,
The non-uniformity of the light distribution, in which the light color differs depending on the direction and location of illumination, has been a problem.

An object of the present invention is to house the arc tubes of a high-pressure sodium lamp and a high-pressure mercury lamp in a single lamp, and coat the outer tube with a phosphor so that both lights emitted from the arc tube are phosphor. This is to eliminate the unevenness of the light distribution by scattering with the light source and reduce the color unevenness of the light source. Another object is to significantly improve the color rendering properties by adding the light emission of the phosphor in addition to the light emission of the high pressure sodium lamp and the high pressure mercury lamp.

[0006]

In order to achieve the above object, the present invention comprises a high pressure sodium lamp arc tube which emits light at the same time in the outer tube of a fluorescent high pressure mercury lamp to form one lamp, and to mix light. Illuminated. In addition, by coating the inner surface of the outer bulb of the high-pressure sodium lamp with a phosphor that emits light in the blue or green region of 400 nm to 550 nm, the emission line of mercury can be absorbed and suppressed, and the color rendering property can be improved.

[0007]

As described above, according to the present invention, different lamps for mixed light illumination are provided in the same outer tube, and a blue-green phosphor is applied to the outer tube to comprehensively compensate for the insufficient luminescent component. The color rendering can be improved as compared with the fluorescent high pressure mercury lamp or the high pressure sodium lamp, and the efficiency can be improved as compared with the fluorescent high pressure mercury lamp alone. Further, by accommodating and providing the two arc tubes in a common outer tube, it is possible to perform mixed light illumination with less unevenness of light color due to the light scattering effect of the phosphor film. At this time, the phosphor absorbs and suppresses the light emission of mercury and efficiently emits light, and does not absorb the light emission of sodium, and becomes a proper scatterer to create uniformly mixed light.

[0008]

EXAMPLES The present invention will be described with reference to examples. FIG. 1 is a partial sectional view showing an embodiment of a high pressure discharge lamp according to the present invention. In FIG. 1, 1a is 400 W made of quartz glass
It is an arc tube of a high pressure mercury lamp, and mercury and a starting gas are enclosed inside. Reference numeral 1b is an arc tube of a 220 W high-pressure sodium lamp made of alumina / ceramic, in which Na-Hg amalgam and starting gas are enclosed. The two arc tubes are fixed inside a common outer bulb 2 made of hard glass by a supporting metal rod 4 which also serves as a power introduction line. One end of each arc tube is connected in series by a lead wire, and the other end is connected to a power introduction line extending from the stem. A phosphor 3 is applied to the inner surface of the outer bulb 2, and the outer bulb is evacuated to a high vacuum of about 10 ⁻⁴ Pa so that the lamp is not affected by the surrounding environment. In some cases, a rare gas such as argon is used. And the base 6 is attached.

The phosphor is prepared, for example, by using a barium-magnesium aluminate matrix and divalent europium and diamine.
Blue-green phosphor Ba ₀ to the valency of manganese co-activated. ₈ Mg _{1. 97} Al
_{16 O 27:.. Eu 0} 2 Mn 0 03 ( emission peak wavelength 445n
m and 515 nm) to 200 g to adjust the concentration with a 1.75% nitrocellulose butyl acetate solution to obtain a fluorescent paint. This paint is injected into the egg-shaped outer tube to form the fluorescent film 3 on the inner surface of the outer tube. The visible light transmittance of the outer tube 2 with the fluorescent film is 95.
%.

The operating principle of the high pressure discharge lamp will be described with reference to FIG. The figure shows a simplified equivalent circuit. The electric power supplied from the ballast 2 connected to the power source 1 is the heat connected to both ends of the high-pressure mercury lamp arc tube 3 and the high-pressure sodium lamp arc tube 4 connected in series in the high-pressure discharge lamp, and in parallel with this. It is added to the response switch 5 and the filament coil 6. When the starting voltage is applied, the thermal switch 5 is closed and the filament coil 6 is heated. At the moment when the heat-responsive switch 5 is opened, a high-voltage pulse is applied between the arc tubes 3 and 4, the high-pressure mercury lamp arc tube 3 is turned on by the resistor 7 and the starting auxiliary electrode 8, and the high-pressure sodium lamp arc tube 4 is coiled. It lights up when heated. The heat-responsive switch 9 and the auxiliary conductor 10 prevent the disappearance of Na in the arc tube.

Assuming that the light quantity (illuminance, luminous flux, etc.) ratio of the high-pressure mercury and fluorescent light emission of the high-pressure discharge lamp to the high-pressure sodium light emission is about 50%, the light emission characteristics are as follows: light color is 3900K, average color rendering index Ra is 50, The luminous efficiency is 79 lm / W. As for the size of the arc tube having a light intensity ratio of about 50%, for example, a combination of a high pressure mercury arc tube and a high pressure sodium arc tube of 400 W and 220 W, or 200 W and 85 W, respectively, is suitable. When the ballast for lighting this is for a mercury lamp, 700 W can be used in the former combination and 300 W in the latter combination. It may also be used as a dedicated ballast. Since the outer tube bulb for accommodating them has a thermal problem in the conventional single lamp, a larger bulb, for example, if the former combination is used, the outer diameter is 150 mm and the latter is 116 mm. It should be about the same.

The high-pressure sodium lamp emits 200 colors of light.
Although it is around 0K, when the light is mixed therewith, the light color of the fluorescent high pressure mercury lamp portion is preferably 6000K or more. Here, the range of light colors suitable for mixed light illumination will be described using the xy-chromaticity coordinates of FIG. A black curve 1 indicates a black body radiation locus, and a thin straight line intersecting with the locus represents a color-matching temperature line. 220
The chromaticity point of the W high-efficiency high-pressure sodium lamp NH-220FL is shown by a square 2, and the chromaticity point of the transparent 400W high-pressure mercury lamp H-400 is shown by a circle 3. The color temperature of a commonly used fluorescent high pressure mercury lamp is 3500K-4500.
Considering that it is K, the broken lines 4 and 5 passing through the black body chromaticity points of 3500 K and 4500 K were drawn from the high pressure sodium lamp chromaticity point. From the figure, it is understood that the chromaticity point of the single fluorescent high-pressure mercury lamp used for mixed light illumination is desirably the two shaded lines 4 and 5 and the shaded portion 6 surrounded by the black body locus. further,
To take a margin of the mixed light ratio, the left side in the shaded area, that is, the color temperature (5700 to 5800
It is desirable to select a region of 6000K or more on the left side of K). This is because the chromaticity range of the high-pressure sodium lamp (square 2) around 2000K and the left side area of the shaded area 6 have a substantially complementary color relationship. At least the main component emission color must be blue or green. Y as a phosphor that realizes 6000 K or more, which shows a brightness characteristic better than room temperature at a lamp operating temperature of 250 ° C.
(P, V) O ₄ , (Y, Gd) (P, V) O ₄ , a self-activated phosphor vanadate phosphor and BaMg ₂ A
1 ₁₆ O ₂₇ , BaMgAl ₁₄ O ₂₃ represented by barium-magnesium aluminate matrix and divalent Eu and 2
A co-activated Mn of value is suitable.

Next, the light mixing ratio for improving various characteristics will be described with reference to FIG. Fig. 4 shows the mixed-light illumination effect curve of a fluorescent high-pressure mercury lamp of 8000K and a high-efficiency high-pressure sodium lamp. The vertical axis shows four characteristics: color rendering index, luminous efficiency, correlated color temperature, and deviation from the blackbody locus. Is also shown, and the horizontal axis shows the light mixing ratio of a fluorescent mercury lamp of 8000K (hereinafter simply referred to as the light mixing ratio). First, in the light-mixing effect curve 1 of the average color rendering index Ra, in order to maintain the effect of improving the color rendering property by light mixing, Ra = 100% of the fluorescent mercury lamp =
The light mixing ratio is about 25% (Ra
= 37) or more is desirable. Further, in the light mixing effect curve 4 of deviation Δuv from the black body radiation locus, the value of Δuv is 0.004 or less so as not to give a sense of discomfort to the light color, and thus the light mixing ratio should be about 55% or less. desirable.
Under this condition, the range of the optimum light mixing ratio considering other effects is set to 20 to 60%. Incidentally, the luminous efficiency η at this time can be set in the range of 76 to 92 lm / W from the effect curve 2, and the correlated color temperature Tc can be set in the range of 2500 to 4500 K from the effect curve 3.

In this embodiment, Y (P,
V) O ₄ , (Y, Gd) (P, V) O ₄ , and a self-activated phosphor vanadate phosphor and BaMg ₂ Al ₁₆ O
₂₇ , BaMgAl ₁₄ O ₂₃ represented by barium-magnesium aluminate matrix, divalent Eu and divalent M
Although the one in which n is co-activated was used, the present invention is not limited to this, and a phosphor used in a usual fluorescent mercury lamp may be used.

[0015]

As compared with the case of using individual lamps alone for mixed light illumination, the lamp of the present invention can reduce unevenness of light color and can realize ideal mixed light illumination. In addition, by coating the outer tube with a fluorescent substance, it is possible to improve the color rendering properties as compared with a single fluorescent high pressure mercury lamp, and the light color gives a refreshing impression similar to that of a metal halide lamp. further,
Since it is a combination of a high-pressure sodium lamp and a high-pressure mercury lamp, both have a long lifespan, and compared with the case of combining them individually, they do not require special lighting fixtures and have versatility. However, maintenance costs can be reduced and it is economical.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a high pressure discharge lamp according to the present invention.

FIG. 2 is an explanatory view of the operation of the high pressure discharge lamp according to the present invention.

FIG. 3 is an explanatory view of optimum chromaticity ranges of a mercury lamp arc tube and a phosphor portion in the present invention.

FIG. 4 is an explanatory diagram of an optimum light mixing ratio in the embodiment of the present invention.

[Explanation of symbols]

1a ... High-pressure mercury lamp arc tube, 1b ... High-pressure sodium lamp arc tube, 2 ... Outer bulb, 3 ... Phosphor.

Claims (4)

[Claims] 1. A high-pressure discharge lamp, characterized in that a high-pressure mercury lamp arc tube and a high-pressure sodium lamp arc tube are both housed in a common outer tube coated with a phosphor, and are turned on at the same time. 2. The phosphor according to claim 1, wherein the phosphor has a wavelength of 40.
A high-pressure discharge lamp that emits light mainly in the region of 0 nm to 550 nm. 3. The wavelength range from 400 nm to 55 according to claim 2.
The phosphor that mainly emits light in the blue to green region of 0 nm is a self-activated phosphor vanadate-based fluorescence represented by Y (P, V) O ₄ , (Y, Gd) (P, V) O _4. Body and BaMg ₂ A
barium represented by l ₁₆ O ₂₇ and BaMgAl ₁₄ O ₂₃
A high-pressure discharge lamp which is at least one selected from a phosphor in which a divalent Eu and a divalent Mn are co-activated with a magnesium aluminate base. 4. The ratio q contributing to the total luminous flux of the lamp of the light emission from the high pressure mercury lamp arc tube and the phosphor excited by the high pressure mercury lamp according to claim 1, wherein 0.2 <q <.
A high-pressure discharge lamp characterized by satisfying 0.6.