JPH06124689A - Fluorescent high-pressure mercury lamp - Google Patents

Abstract

PURPOSE:To provide the excellent illumination of mixed light by combining a fluorescent high-pressure mercury lamp, the inner surface of the outer tube of which a fluorescent substance is applied to with a high-pressure discharge lamp which operates at a temperature of not more than 3000K to make light, thereby setting the color temperature of the former to not less than 6000K. CONSTITUTION:The point of chromaticity of a fluorescent high-pressure mercury lamp itself for the illumination of mixed light is preferably in the region at the color temperature of not less than 6000K with a margin in the region 7 surrounded by broken lines 5, 6 connecting the point of a double circle 1 of a high-pressure sodium lamp at which the color temperature is before and behind 2000K with the points of 3500K and 4500K in the color temperature of an ordinary fluorescent high-pressure mercury lamp and also by a backbody locus 4. Therefore, fluorescent materials of self-activating phosphor vanadic acid chlorine such as Y (P, V)O4 and also fluorescent materials in which Eu of bivalent and Mn of bivalent are actively added to the host of chlorine aluminate of barium and magnesium such as BaMg2Al16O27 are suitable for blue color fluorescent materials which shows the excellent brightness characteristics at the operating temperature of 250 deg.C when they are applied to the outer tube of a lamp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a fluorescent high pressure mercury lamp,
In particular, the present invention relates to a fluorescent high pressure mercury lamp having excellent illumination characteristics and economy in mixed light illumination in which the lamp and a high pressure discharge lamp having a color temperature of 3000 K or less are combined and turned on.

[0002]

2. Description of the Related Art When a fluorescent high-pressure mercury lamp is used alone for outdoor and indoor lighting, the improvement in the quality of the lighting that has been attempted so far has been mainly the improvement of color rendering. Therefore, much attention has been paid to the selection of the phosphor to be coated on the inner surface of the outer tube and the optimization of the fluorescent film thickness.

For example, in Japanese Patent Laid-Open No. 2-98035, 62
Disclosed is a europium-activated phosphor having an emission peak near 0 nm and a fluorescent high-pressure mercury lamp having a color temperature of 3900 to 4400 K using a phosphor having an emission peak at 480 to 600 nm. Further, Japanese Patent Application Laid-Open No. 4-80286 discloses a fluorescent high-pressure mercury lamp having a color temperature of 3950 to 4250K using four kinds of phosphors containing cerium-activated yttrium aluminate. All of the disclosed lamps are provided with an emission distribution by a phosphor in a wavelength range other than visible mercury rays emitted from an arc tube, or
The characteristic is that the color rendering property is improved as compared with the conventional lamp by suppressing the intensity of the 35 nm mercury ray by the matrix absorption of the phosphor.

On the other hand, a light source for mixed light illumination in which a high-pressure mercury lamp is combined with another high-pressure discharge lamp is described on pages 290 to 291 of Lighting Handbook (Published by Ohmsha, 1987) edited by The Institute of Illumination. The light-mixing characteristics of the high pressure mercury lamp and the metal halide lamp, and the light-mixing characteristics of the metal halide lamp and the high-pressure sodium lamp are illustrated. The characteristic of mixed light illumination is that the characteristics of individual light sources can be compensated by mixing light, and the quantity of light such as lamp efficiency can be improved or the quality of light such as color rendering and light color can be improved.

[0005]

In the method of improving the color rendering of a fluorescent high pressure mercury lamp alone by selecting the phosphor as described above, the color temperature is 350 regardless of the kind of the lamp.
It was limited to the region of 0-4500K. Further, in order to improve the color rendering without lowering the lamp efficiency, it was essential to select a phosphor having a chromaticity point as close as possible to the black body locus on the chromaticity coordinate and to optimize the fluorescent film thickness.

However, in mixed light illumination in which a plurality of types of light sources are combined, it is not necessary to impose the restrictions on the color temperature and the restrictions on the chromaticity point only on the fluorescent high pressure mercury lamp alone. Rather, the characteristics of the single fluorescent high-pressure mercury lamp that satisfy these restrictions when mixed with light are required. SUMMARY OF THE INVENTION It is an object of the present invention to provide a new fluorescent color high-pressure mercury lamp with a high color temperature that has never been seen in the past, by radically revising the improved guideline that has been conventionally required when applying a phosphor to a single lamp.

[0007]

According to the present invention, a color temperature of 30 is used as a light source which is turned on in combination with a fluorescent high pressure mercury lamp.
A high pressure discharge lamp of 00K or less was selected. Among the high-pressure discharge lamps of 3000 K or less known so far, the one having the highest lamp efficiency and long life is the high-pressure sodium lamp. An example of a high-pressure sodium lamp having a color temperature of around 2000K will be described below with reference to FIG. 1 in which region the x and y chromaticity points of a single fluorescent high-pressure mercury lamp used for mixed light illumination should be. To do.

The double circle 1 in FIG. 1 represents the chromaticity point of the 220 W high-efficiency high-pressure sodium lamp NH220FL, and the white circle 2 represents the color of a high-pressure mercury lamp in which no phosphor is applied, that is, the outer bulb is transparent. Indicates a point. Of the two curves rising to the right, the upper 3 is the synthetic daylight curve, and the lower 4 is the black body locus. Considering that the color temperature of a commonly used fluorescent high-pressure mercury lamp is 3500 to 4500K, the straight lines connecting the double circle and the 3500K blackbody point and the straight circle and the 4500K blackbody point are broken lines 5 and 6, respectively. Indicated by. From the figure, it is understood that the chromaticity point of the single fluorescent high-pressure mercury lamp used for mixed light illumination is preferably the shaded area 7 surrounded by the two broken lines and the black body locus. Further, in order to increase the margin of the mixed light ratio, the color temperature (5700-5
It is desirable to select a region of 6000 K or higher, which has a color temperature higher than 800 K). This is because the chromaticity range of the high-pressure sodium lamp around 2000 K (near the double circle 1) and the left side area of the shaded area 7 have a substantially complementary color relationship. As for the emission color of the phosphor, at least the emission color of the main component must be blue or blue-green. As blue phosphors which are applied to the outer tube of a lamp and show better luminance characteristics at room temperature to 250 ° C. than at room temperature, Y (P, V) O ₄ , (Y, Gd) (P, V)
A self-activated phosphor vanadate phosphor represented by O ₄ and a barium-magnesium aluminate base represented by BaMg ₂ Al ₁₆ O ₂₇ and BaMgAl ₁₄ O ₂₃ are used as a divalent Eu and 2 Phosphors co-activated with valence Mn are suitable.

[0009]

As described above, the present invention provides a fluorescent high-pressure mercury lamp coated with a phosphor containing blue or blue-green as a main component in order to achieve a color temperature of 6000 K or higher, which is higher than that of the transparent high-pressure mercury lamp. By lighting the lamp in combination with a high-pressure discharge lamp having a color temperature of 3000 K or less, it is possible to obtain mixed light illumination that makes the most of the characteristics of both lamps. When the high-pressure discharge lamp is a high-efficiency high-pressure sodium lamp, both fluorescent high-pressure mercury lamp and high-pressure sodium lamp have a long life, so both lamps can be replaced at the same time. There is also an advantage that the replacement and maintenance of the lamp installed on the pole is easy and economical. The above-mentioned 6000K and 3000K are set as color temperatures having a color temperature larger than that of the transparent high-pressure mercury lamp and 6000K with a large light-mixing ratio margin, respectively. As can be easily inferred from FIG. 1, when the color temperature of the fluorescent high-pressure mercury lamp is selected to be less than 6000 K, the chromaticity point under mixed light illumination is located below the black body locus 7 and does not help Ra improvement. On the other hand, if the color temperature of the high-pressure discharge lamp combined with the fluorescent high-pressure mercury lamp is selected to exceed 3000K, the lamp characteristic under mixed light illumination is the conventional color temperature of 4000K ± 500K.
The same as the characteristics of the fluorescent high-pressure mercury lamp alone, and the effects unique to mixed light illumination cannot be exhibited.

[0010]

【Example】

 (Example 1) Aluminate mother of barium-magnesium
Covalently activated divalent europium and divalent manganese in the body
Blue-green phosphor Ba₀.₈Mg₁.₉₇Al₁₆O₂₇: Eu₀.₂, M
n₀. ₀₃(Emission peak wavelengths are 445 nm and 515 nm) 2
Dissolve 1.75% nitrocellulose butyl acetate in 00 g
Add 440 cc of solution and mix thoroughly, then add more acetate.
The concentration was adjusted with a chill solution to obtain a fluorescent paint. This paint
To the inner surface of the outer tube by injecting
A fluorescent film was formed. Visible average transmittance of outer tube with fluorescent film
Was 95%. Then using the normal lamp manufacturing process
A 400 W fluorescent high pressure mercury lamp was created. Obtained la
The light flux is 25500 lm, color temperature is 8600K, Ra
= 35, chromaticity point x = 0.265, y = 0.363
As a result, an unprecedented blue-white lamp with a transparent feeling was obtained. Luminous
The distribution is shown by the solid line 8 in the upper part of FIG. Similarly, the color temperature is on the upper row.
Degree 1990K, chromaticity point x = 0.531, y = 0.415
220W high efficiency high pressure sodium lamp (NH22
The emission distribution of 0FL) is shown by a broken line 9.

The lower part of FIG. 2 shows the light emission distribution 10 when the fluorescent high-pressure mercury lamp and the high-pressure sodium lamp described above are placed at intervals of 150 mm and lit, and the light mixing ratio is adjusted to 55:45. Color temperature of 4190
K, Ra = 51, chromaticity point x = 0.376, y = 0.38
5,77.7 lm / W was obtained. The color temperature after mixing is within the range of 4000K ± 500K of the color temperature of a single fluorescent high pressure mercury lamp that has been widely used in the past, and the Ra is improved from 35 to 51 by about 1.5 times compared with the single lamp. And lm
/ W increased 1.2 times from 64.7 to 77.7. 36 in color temperature of 2080K instead of NH220FL
When similar light mixing was performed using 0 W NH360FL type, lm / W was improved from 64.7 to 82.2 by 1.27 times.

Example 2 A blue phosphor YP ₀ .. made of self-activated yttrium phosphorus vanadate. ₈₅ V ₀ . ₁₅ O
₄ (emission peak wavelength 450 nm), green phosphor (La, Ce) PO ₄ : Tb (emission peak wavelength 543 nm) co-activated with cerium and terbium, and tetravalent manganese attached to magnesium fluoro-germanate matrix Activated deep red phosphor 3.5MgO ・ 0.5MgF ₂・ GeO ₂ : M
n (emission peak wavelength 659 nm) in weight ratio 36.0: 5
A fluorescent paint was prepared in the same manner as in Example 1 by using 200 g of the phosphor mixed so as to have a ratio of 9.3: 4.7, and this was applied to the inner surface of the outer tube to obtain a 400 W fluorescent high-pressure mercury lamp. Created. The obtained luminous flux of the lamp is 22,500 lm, the color temperature is 6380 K, Ra = 26, the chromaticity point x = 0.310,
Since y = 0.372, a fresh lamp light color, which was unexpected and unprecedented, was exhibited despite the low Ra. The initial luminous flux of a transparent high-pressure mercury lamp without applying phosphor is about 1900.
It is more effective than 0 lm and Ra = 15.

When the above fluorescent high-pressure mercury lamp and a 220-W high-pressure sodium lamp were lit in parallel and the mixing ratio of both lamps was adjusted to 1: 1, the color temperature was 3320K, Ra = 3.
8,73.3 lm / W was obtained. On the other hand, when the transparent high-pressure mercury lamp and the high-pressure sodium lamp were mixed at a ratio of 1: 1, the color temperature was 3180K, Ra = 30, and 67.3 lm / W.
Stayed in.

(Embodiment 3) A blue phosphor YP ₀ .. made of self-activated yttrium phosphorus vanadate. ₈₅ V ₀ . ₁₅ O
Yttrium Phosphor vanadate red phosphor YP ₀₆₅ V with ₄ (emission peak wavelength 450 nm) and trivalent europium
_[035] O ₄ : Eu (emission peak wavelength 619 nm) was used in a weight ratio of 7
A fluorescent high pressure mercury lamp of 400 W was prepared in the same manner as in Examples 1 and 2 by using the phosphors mixed so as to be 5:25. Lamp luminous flux is 20100 lm, color temperature is 60
10K, Ra = 37, chromaticity point x = 0.322, y = 0.
337 was obtained.

The fluorescent high-pressure mercury lamp described above is used for color temperature 208
0K, 360W high pressure sodium lamp (NH360F
L), the lamp is lit in parallel, and when the light mixing ratio of both lamps is adjusted to 1: 1, color temperature 3280K, Ra = 37, chromaticity point x =
0.410, y = 0.376, and lm / W is 51.
It increased 1.4 times from 2 to 72.6.

[0016]

As described above, according to the present invention, not only is a light source of a new color unprecedented having a higher color temperature than a transparent high-pressure mercury lamp that does not use a phosphor be provided.
By lighting in combination with a high-pressure discharge lamp having a color temperature of 3000 K or less, it is possible to obtain mixed light illumination characteristics that make the best use of the characteristics of each single lamp. Further, when a high-pressure sodium lamp is used as a high-pressure discharge lamp of 3000 K or less, since it has a life as long as that of a fluorescent high-pressure mercury lamp, both lamps can be replaced at the same time, and the economical effect is great.

[Brief description of drawings]

FIG. 1 is a diagram for explaining the operation principle of a lamp of the present invention.

FIG. 2 is a diagram showing a light emission distribution of a single lamp of the present invention and a light emission distribution under mixed light.

[Explanation of symbols]

1 ... Chromaticity point of high-pressure sodium lamp, 2 ... Chromaticity point of transparent high-pressure mercury lamp, 3 ... Synthetic daylight curve, 4 ... Black body locus,
5… 1 and 3500K A straight line connecting the blackbody points, 6… 1 and 45
00K Straight line connecting black body points, 7 ... Desirable chromaticity range under mixed light illumination, 8 ... Emission distribution of 8600K fluorescent high-pressure mercury lamp, 9 ... Emission distribution of high-pressure sodium lamp, 10
Emission distribution when light is mixed at 55% for 8 and 45% for 9.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kanji Koji 888 Fujibashi, Ome City, Tokyo Metropolitan area, Ome factory, Hitachi, Ltd. (72) Go Kimura 888 Fujibashi, Ome city, Tokyo Metropolitan area, Ome factory, Hitachi, Ltd.

Claims (4)

[Claims] 1. A fluorescent high-pressure mercury lamp comprising an arc tube emitting radiation in the ultraviolet and visible ranges and an outer tube accommodating the arc tube, wherein the inner surface of the outer tube is coated with a phosphor, and the color temperature of the lamp is A fluorescent high pressure mercury lamp characterized by having a temperature of 6000K or more. 2. The phosphor according to claim 1, which emits light in a blue to green region required to achieve a color temperature of 6000 K or more, is Y (P, V) O ₄ , (Y, Gd) (P, V). Self-activated phosphor vanadate phosphor represented by O ₄ and B
At least one selected from phosphors obtained by co-activating divalent Eu and divalent Mn on a barium-magnesium aluminate base represented by aMg ₂ Al ₁₆ O ₂₇ and BaMgAl ₁₄ O _23. A fluorescent high-pressure mercury lamp characterized in that 3. The color temperature of the lamp according to claim 1 or 2 is 3000K.
A fluorescent high-pressure mercury lamp, which is characterized in that when it is lit in combination with the following high-pressure discharge lamp, mixed light illumination characteristics exceeding the lamp characteristics of a single fluorescent high-pressure mercury lamp before combination are obtained. 4. A fluorescent high-pressure mercury lamp characterized in that the high-pressure discharge lamp of claim 3 is a high-pressure sodium lamp having a life as long as that of the fluorescent high-pressure mercury lamp.