JP3437493B2 - Discharge lamp for automotive headlight and automotive headlight - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge lamp for a vehicle headlight and a vehicle headlight.

[0002]

2. Description of the Related Art Conventionally, halogen bulbs have been widely used in automobile headlights. Further, in recent years, a headlight using a high-pressure discharge lamp (called a HID headlight) is becoming widespread as a headlight that realizes energy saving and brightness increase. This headlight can illuminate the front brightly with less electric power than a headlight using a halogen bulb. On the other hand, for drivers of oncoming vehicles, HI
D When an oncoming vehicle with the headlights on is approaching, the headlights may be dazzling, causing unpleasant glare, which may interfere with safe traffic. Therefore, while illuminating the front brightly,
Moreover, there is a demand for a headlight that is less likely to cause unpleasant glare.

As a method of reducing unpleasant glare, a method of lowering the luminous intensity of the headlight in the oncoming vehicle direction and a method of lowering the correlated color temperature of the light source can be considered. The former method is not accurate because it reduces the illuminance in the front. As the latter method, a method of using a high pressure discharge lamp having a low correlated color temperature such as a high pressure sodium lamp can be considered. However, the high-pressure sodium lamp has a problem that the color of safety colors such as road markings and road signs is poorly visible, although there is no danger in traffic safety because the color of light is yellowed and the color rendering is low.

A conventional metal halide lamp for an automobile lamp has a color close to that of a light bulb, for example, 2000 to 4000K.
In order to obtain the above low color temperature, there has been proposed an arc tube lamp having a color temperature of more than 4000K in an outer tube having a multilayer interference film formed on the surface (Japanese Patent Laid-Open No. 5-325895). Further, as a conventional metal halide lamp, an arc tube lamp having a light color close to that of black body radiation and a correlated color temperature of 2800 to 3700K has been proposed (JP-A-7-130331).

However, the conventional arc tube lamp has a problem in that it is not possible to obtain the color discrimination (identification) close to that of a fluorescent lamp having a good color appearance used in wall lighting.

Further, as a conventional metal halide lamp, there has been proposed one having an arc tube in which a metal halide and an argon gas are enclosed (Japanese Patent Laid-Open No. 7-27200).
-320688, JP-A-7-130331, JP-A-62-131459, JP-A-61-6406.
No. 0, JP-A-5-205697).

However, since such a conventional metal halide lamp has a poor luminous flux rising characteristic, it cannot illuminate the front brightly immediately after lighting, and thus is not suitable as a discharge lamp for automobiles.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention reduces the unpleasant glare caused by a headlight and improves the visual appearance of various colors, mainly safety colors. It is an object of the present invention to provide a discharge lamp for a headlamp and a vehicle headlamp.

[0009]

In order to achieve the above object, the first discharge lamp for a vehicle headlight according to the present invention comprises:
Equipped with an arc tube filled with xenon gas, the chromaticity point of the light color is long with the chromaticity point (u, v) = (0.224,0.331) as the center on the CIE1960uv chromaticity diagram. The axis is 0.080, the minor axis is 0.024, and the inclination from the u axis is 35 degrees, which is within the range of an ellipse, and the chromaticity point (u,
v) = (0.220, 0.332) as the center, the major axis is 0.060, the minor axis is 0.022, and the inclination from the u axis is 15
Is in the range of an ellipse that is degree, and the chromaticity point (u, v) =
The major axis is 0.0 with (0.235, 0.335) as the center.
60, minor axis Ri near range inclination of the ellipse is 30 degrees from the u axis 0.030, the arc tube further metal
Halide is enclosed, and the metal halide is
Contains thorium halides, and the amount enclosed is metal halo.
It is characterized by being 50% by weight or more with respect to the total amount of the genide encapsulated . Here, the CIE1960uv chromaticity diagram is
It is stipulated in JIS Z8105 and defined by the CIE (International Commission on Illumination) in 1960. At all points on the chromaticity diagram, the sensory difference of colors with equal brightness is the geometric distance on the diagram. The scale is intentionally set to be proportional to. Second automobile headlight of the present invention
The discharge lamp for a lamp has xenon gas sealed inside.
Equipped with a light emitting tube, the chromaticity point of the light color is CIE1960uv color
On the chromaticity diagram, the chromaticity point (u, v) = (0.224,0.33
The major axis is 0.080 and the minor axis is 0.024 with 1) as the center.
Is within the range of an ellipse whose inclination from the u axis is 35 degrees,
And the chromaticity point (u, v) = (0.220,0.332)
The major axis is 0.060, the minor axis is 0.022, and the u axis is the center.
Is within the range of an ellipse with an inclination of 15 degrees from
Centering around the point (u, v) = (0.235, 0.335)
The major axis is 0.060 and the minor axis is 0.030.
Within the range of an ellipse with an inclination of 30 degrees, inside the arc tube
Further, a metal halide is enclosed in the
Rogenide is sodium halide and scandi
Includes halides of um and halogenates thorium
Compounds and metal halides of thallium
Sealing the sodium halides to the total amount of enclosed reduction product
Filling amount is W _Na wt% and inclusion of scandium halide
When the amount was W _{Sc wt%, 90 <W Na + W} Sc, and, and satisfies a _{0.75 ≦ W Na / (W Sc} + W Na) <1 relationship. The third aspect of the present invention
Xenon gas is sealed inside the discharge lamp for automobile headlights.
Equipped with an arc tube installed, the chromaticity point of the light color is CIE19
On the 60 uv chromaticity diagram, the chromaticity point (u, v) = (0.22
4, 0.331) as the center, the major axis is 0.080, and the minor axis is
Of an ellipse with 0.024 and an inclination of 35 degrees from the u axis
Is within the circle and the chromaticity point (u, v) = (0.220,
0.332) with the major axis at 0.060 and the minor axis at
Range of an ellipse with an inclination of 15 degrees from the u axis at 0.022
, And the chromaticity point (u, v) = (0.235,0.
335) as the center, the major axis is 0.060 and the minor axis is 0.0
Within the range of an ellipse with an inclination of 30 degrees from the u axis at 30
Ri, wherein the arc tube is, the more metal halides sealed
And the metal halide is sodium halogen.
And thalium halides, and thallium
Total encapsulation amount of metal halides, excluding halides
The amount of halogen compound of thorium with respect to the W _Th wt%
Then, 90 <W _Na + W _Sc + W _Th , and 0.75
≤ [W _Na / (W _Sc + W _Na )]-[W _Th / (W _Sc + W _Na + W _Th )]
It is characterized in that the relationship <1 is satisfied. No. 4 of the present invention
Discharge lamps for automobile headlights have xenon gas inside.
Equipped with an arc tube, the chromaticity point of the light color is CIE
Chromaticity point (u, v) = (0.2
24, 0.331) and the major axis is 0.080, short
Of an ellipse whose axis is 0.024 and whose inclination from the u axis is 35 degrees
It is within the range and the chromaticity point (u, v) = (0.220,
0.332) with the major axis at 0.060 and the minor axis at
Range of an ellipse with an inclination of 15 degrees from the u axis at 0.022
, And the chromaticity point (u, v) = (0.235,0.
335) as the center, the major axis is 0.060 and the minor axis is 0.0
Within the range of an ellipse with an inclination of 30 degrees from the u axis at 30
Ri, wherein the arc tube is, the more metal halides sealed
And the metal halide is sodium halogen.
Halide, scandium halide and thallium halo
Contains Genide and Thorium Halide
However, the amount of thallium contained in the total amount of metal halides
When the encapsulation amount of the rogenide is W _Tl weight%, 90 <W _Na + W _Sc + W _Tl , 0.75 ≦ W _Na / (W _Sc + W _Na ) <1, and W _Tl / (W _Sc + W _Na + W It is characterized by satisfying the relationship of _Tl ) ≦ 0.03 . 5th of the present invention
Xenon gas is sealed inside the discharge lamp for automobile headlights.
Equipped with an arc tube installed, the chromaticity point of the light color is CIE19
On the 60 uv chromaticity diagram, the chromaticity point (u, v) = (0.22
4, 0.331) as the center, the major axis is 0.080, and the minor axis is
Of an ellipse with 0.024 and an inclination of 35 degrees from the u axis
Is within the circle and the chromaticity point (u, v) = (0.220,
0.332) with the major axis at 0.060 and the minor axis at
Range of an ellipse with an inclination of 15 degrees from the u axis at 0.022
, And the chromaticity point (u, v) = (0.235,0.
335) as the center, the major axis is 0.060 and the minor axis is 0.0
Within the range of an ellipse with an inclination of 30 degrees from the u axis at 30
Ri, wherein the arc tube is, the more metal halides sealed
And the metal halide is sodium halogen.
Halides, scandium halides, thorium halogens
And halides of thallium, 90 <W _Na + W _Sc + W _Th + W _Tl , 0.75 ≦ [W _Na / (W _Sc + W _Na )] − [W _Th / (W _Sc +
W _Na + W _Th )] <1 and -0.05 ≦ [W _Th / (W _Sc + W _Na + W _Th )]-2
× [W _Tl / (W _Sc + W _Na + W _Th + W _Tl )] is satisfied.

As a result, it is possible to obtain a discharge lamp in a low color temperature region, which is similar to a fluorescent lamp with good color visibility used in indoor lighting and which is excellent in color discrimination (identification).

[0011] sixth vehicle headlights discharge lamp of the present invention includes an arc tube xenon gas inside is sealed, the chromaticity point of light color on the diagram CIE1960uv chromaticity,
Within the range of an ellipse centered on the chromaticity point (u, v) = (0.221, 0.329), the major axis is 0.047, the minor axis is 0.014, and the inclination from the u axis is 35 degrees. Of the ellipse with a major axis of 0.040, a minor axis of 0.015, and an inclination of 15 degrees from the u axis with the chromaticity point (u, v) = (0.224,0.334) as the center. Is within the range and the chromaticity point (u,
v) = (0.236, 0.339) as the center, the major axis is 0.037, the minor axis is 0.013, and the inclination from the u axis is 30.
Time is the range in the near of the ellipse is, the arc tube is further
A metal halide is enclosed in the metal halide,
Contains sodium halide, and the amount enclosed is gold.
It is characterized in that it is 50% by weight or more with respect to the total amount of the group halides enclosed . For the seventh automotive headlight of the present invention
The discharge lamp has a xenon gas filled inside.
Equipped with a light tube, the chromaticity point of the light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.221,0.329)
With the major axis at 0.047 and the minor axis at 0.014
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.224, 0.334)
The major axis is 0.040, the minor axis is 0.015
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.236, 0.339)
The major axis is 0.037, the minor axis is 0.013 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees, and
Is further encapsulated with a metal halide,
Genide is a sodium halide and scandium.
And halides of thorium
And metal halides containing no thallium halide
Encapsulation of sodium halide with respect to total encapsulation amount
W _Na % by weight, scandium halide encapsulation amount
The when the W _{Sc wt%, 90 <W Na + W} Sc and, and satisfies a _{0.75 ≦ W Na / (W Sc} + W Na) <1 relationship. 8th of the present invention
Xenon gas is sealed inside the discharge lamp for automobile headlights.
A light-emitting tube being input, the chromaticity point of light color is CIE19
On the 60 uv chromaticity diagram, the chromaticity point (u, v) = (0.22
1, 0.329) as the center, the major axis is 0.047, the minor axis is
Is 0.014 and the inclination from the u-axis is 35 degrees.
Is within the circle and the chromaticity point (u, v) = (0.224,
0.334), the major axis is 0.040 and the minor axis is
Range of an ellipse with an inclination of 15 degrees from the u axis at 0.015
, And the chromaticity point (u, v) = (0.236,0.
339) with the major axis at 0.037 and the minor axis at 0.0
13 is within the range of the ellipse whose inclination from the u axis is 30 degrees.
Ri, wherein the arc tube is, the more metal halides sealed
And the metal halide is sodium halogen.
And thalium halides, and thallium
Total encapsulation amount of metal halides, excluding halides
The amount of halogen compound of thorium with respect to the W _Th wt%
Then, 90 <W _Na + W _Sc + W _Th , and 0.75
≤ [W _Na / (W _Sc + W _Na )]-[W _Th / (W _Sc + W _Na + W _Th )]
It is characterized in that the relationship <1 is satisfied. No. 9 of the present invention
Discharge lamps for automobile headlights have xenon gas inside.
Equipped with an arc tube, the chromaticity point of the light color is CIE
Chromaticity point (u, v) = (0.2
21, 0.329) as the center, the major axis is 0.047, the minor axis is short.
Of an ellipse whose axis is 0.014 and whose inclination from the u axis is 35 degrees
Within the range and the chromaticity point (u, v) = (0.224,
0.334), the major axis is 0.040 and the minor axis is
Range of an ellipse with an inclination of 15 degrees from the u axis at 0.015
, And the chromaticity point (u, v) = (0.236,0.
339) with the major axis at 0.037 and the minor axis at 0.0
13 is within the range of the ellipse whose inclination from the u axis is 30 degrees.
Ri, wherein the arc tube is, the more metal halides sealed
And the metal halide is sodium halogen.
Halide, scandium halide and thallium halo
Contains Genide and Thorium Halide
However, the amount of thallium contained in the total amount of metal halides
When the encapsulating amount of the rogenide is W _Tl weight%, 90 <W _Na + W _Sc + W _Tl , 0.75 ≦ W _Na / (W _Sc + W _Na ) <1, and W _Tl / (W _Sc + W _Na + W It is characterized by satisfying the relationship of _Tl ) ≦ 0.03 . 10th of the present invention
The xenon gas inside the discharge lamps for automobile headlamps
Equipped with an enclosed arc tube, the chromaticity point of the light color is CIE1
On the 960 uv chromaticity diagram, the chromaticity point (u, v) = (0.22
1, 0.329) as the center, the major axis is 0.047, the minor axis is
Is 0.014 and the inclination from the u-axis is 35 degrees.
Is within the circle and the chromaticity point (u, v) = (0.224,
0.334), the major axis is 0.040 and the minor axis is
Range of an ellipse with an inclination of 15 degrees from the u axis at 0.015
, And the chromaticity point (u, v) = (0.236,0.
339) with the major axis at 0.037 and the minor axis at 0.0
13 is within the range of the ellipse whose inclination from the u axis is 30 degrees.
Ri, wherein the arc tube is, the more metal halides sealed
And the metal halide is sodium halogen.
Halides, scandium halides, thorium halogens
Include emissions halide and halide of _{thallium, 90 <W Na + W Sc} + W Th + W Tl, 0.75 ≦ [W Na / (W Sc + W Na)] - [W Th / (W Sc +
W _Na + W _Th )] <1 and -0.05 ≦ [W _Th / (W _Sc + W _Na + W _Th )]-2
× [W _Tl / (W _Sc + W _Na + W _Th + W _Tl )] is satisfied.

As a result, it is possible to obtain a discharge lamp in a low color temperature region which is excellent in color discrimination (identification), which is equivalent to that of a fluorescent lamp having a good color appearance used for indoor lighting.

In the first to tenth discharge lamps of the present invention, the chromaticity point of the light color is (0.221, 0.34) on the CIE1960uv chromaticity diagram.
5), (0.252, 0.345), (0.248,
0.338) and (0.231, 0.330) are preferably within the range surrounded by four points. As a result, it is possible to obtain a discharge lamp that gives a white object such as a white line on the illuminated road surface as "white", that is, an excellent white feeling.

In the first to tenth discharge lamps of the present invention, the chromaticity point of the light color is (0.224, 0.34) on the CIE1960uv chromaticity diagram.
1), (0.244, 0.341), (0.229,
It is preferably within a range surrounded by three points of (0.333). This makes it possible to obtain a discharge lamp in which a white object such as a white line on the illuminated road surface feels “white”, that is, a white feeling is particularly excellent.

In the first to tenth discharge lamps of the present invention, the chromaticity point of the light color is on the CIE1960uv chromaticity diagram in the range on the lower color temperature side than the isochromatic temperature line of the correlated color temperature of 3800K. It is preferable to be within. As a result, in addition to the effects obtained in the above, it is possible to obtain a good effect that the glare caused by illumination is less likely to be felt.

In the present invention, the chromaticity point of the light color in the discharge lamp described in any of the above is CIE1960.
On the uv chromaticity diagram, it is preferable that the correlated color temperature is within the range on the higher color temperature side than the color matching line of 3400K. As a result, in addition to the effects obtained above, it is possible to obtain the effect of making it difficult to sense the glare caused by the illumination and differentiating the light color from the headlight using the existing halogen bulb.

In the present invention, the discharge lamp according to any one of the above is used for a vehicle headlight.
As a result, the effects obtained above can be obtained as a headlight for an automobile.

[0018]

The discharge lamp has at least a pair of electrodes, and the distance d between the tips of the electrodes is 8 m.
m or less, and the inner diameter D of the arc tube in the middle between the electrodes is 5 m
It is preferable that the power consumption is less than or equal to m, the applied power during lighting is less than or equal to 70 W, and the lamp efficiency during lighting is greater than or equal to 50 lm / W.

[0020]

[0021]

[0022]

[0023]

[0024]

In the discharge lamp, it is preferable that cesium halide is filled as the metal halide in an amount of 10% by weight or less based on the total amount of the metal halide filled.

In the discharge lamp, 350 n
It is preferable to have a structure including an outer tube having a linear transmittance of m of 30% or less and a linear transmittance of 450 nm of 70% or more.

In the discharge lamp, it is preferable that the outer tube has a structure in which at least one end of the arc tube is sealed.

Further, in the discharge lamp, the inner diameter of the outer tube is preferably 12 mm or less.

According to the preferred embodiment of the present invention described above, it is excellent in color discrimination, it is hard to feel the glare due to illumination, the illuminated white object feels as "white", and the headlight using the present halogen bulb is used. A discharge lamp having the effect of differentiating the light color from that of the lamp and the effect of irradiating a constant light color and luminous flux can be obtained because the change in the temperature of the coldest spot of the arc tube due to the lighting conditions is reduced.

[0030]

BEST MODE FOR CARRYING OUT THE INVENTION An experiment in which a chromaticity range of a light color in which a color object looks appropriately by light from a light source is obtained will be sequentially described.

First, an experiment concerning color discrimination (identification) was conducted for the colors used for traffic signs and the like, under the lamps having different light colors of light sources. In the experiment, as a typical color used for road signs and displays, the ease of distinguishing red, blue, green, etc. was changed, and the color difference was changed in various ways, and the subject was made to judge the color difference of the target color chart. I did.

FIG. 2 shows the result of an experiment for distinguishing red. The light color of the light source is centered on the chromaticity point (u, v) = (0.224,0.331) on the CIE1960uv chromaticity diagram. , The major axis is 0.080, the minor axis is 0.024 and u
75 if within the range of an ellipse with an inclination of 35 degrees from the axis
It was revealed that more than 100% of the subjects can distinguish colors having a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

FIG. 3 shows the results of experiments on the easiness of distinguishing green, and the light color of the light source is the chromaticity point (u, v) = (0.220,0.332) on the CIE1960uv chromaticity diagram.
7 around the center of the ellipse with the major axis of 0.060, the minor axis of 0.022, and the inclination of 15 degrees from the u axis.
It was revealed that 5% or more of the subjects could distinguish colors with a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

Further, FIG. 4 shows an experimental result regarding the easiness of distinguishing blue, and the light color of the light source is the chromaticity point (u, v) = (0.235,0.335) on the CIE1960uv chromaticity diagram.
With the major axis at 0.060 and the minor axis at 0.030,
Within the range of an ellipse whose inclination from the u-axis is 30 degrees,
It was revealed that 75% or more of the subjects can distinguish colors having a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

That is, the light sources having light colors within the range of all three ellipses relating to the easiness of distinguishing red, blue, green, etc. obtained in the experiment are excellent in color discrimination in almost all categories of colors. It can be concluded that it is a light source. The chromaticity range within these three ellipses is indicated by the diagonal lines in FIG.

Further, FIG. 6 shows an experimental result on the easiness of distinguishing red, and the light color of the light source is the chromaticity point (u, v) = (0.221, 0.32) on the CIE1960uv chromaticity diagram.
Centering on 9), the major axis is 0.047 and the minor axis is 0.01
It was clarified that 85% or more of the subjects could discriminate colors having a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space within the range of the ellipse having the inclination of 35 degrees from the u axis in 4.

Further, FIG. 7 shows an experimental result regarding the easiness of distinguishing green, and the light color of the light source is the chromaticity point (u, v) = (0.224,0.334) on the CIE1960uv chromaticity diagram.
8 with the major axis at 0.040, the minor axis at 0.015, and the minor axis at 0.015 and the inclination from the u axis is 15 degrees.
It was revealed that 5% or more of the subjects could distinguish colors with a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

FIG. 8 shows an experimental result on the easiness of distinguishing blue. The light color of the light source is the chromaticity point (u, v) = (0.236,0.339) on the CIE1960uv chromaticity diagram.
With the major axis at 0.037 and the minor axis at 0.013,
Within the range of an ellipse whose inclination from the u-axis is 30 degrees,
It was revealed that 85% or more of the subjects can distinguish colors having a color difference of 2 or more in the CIE1976L ^* a ^* b ^* color space.

That is, light sources having light colors within the range of all three ellipses relating to the easiness of distinction such as red, blue, green, etc., obtained in the experiment, are particularly discriminative in color in almost all categories. It can be concluded that it is an excellent light source. The chromaticity ranges within these three ellipses are indicated by the diagonal lines in FIG.

Next, the correlated color temperature 40 with various light source colors is used.
An experiment was conducted on the white sensation felt when viewing an achromatic visual object under the condition of being illuminated by a lamp having a color temperature range of 00K or less.

In the experiment, an achromatic color chart having a Munsell value of 9 was presented to a subject under a lamp having various light colors of light sources, and the total number of colors and whiteness perceived from the color chart was 100 points. Was distributed and answered. The result is C
On the IE1960uv chromaticity diagram, the range of light colors excellent in whiteness is shown by the shaded portion in FIG.
Note that FIG. 10 shows a range in which the number of white responses is 90 points or more, and the chromaticity point (u, v) on the CIE1960uv chromaticity diagram is (0.221, 0.345), ( 0.2
52, 0.345), (0.248, 0.338),
It became clear that it is the range surrounded by four points (0.231, 0.330). Therefore, it was confirmed that a light source having a light source color within this range can recognize a white object as clearly white.

The shaded area in FIG. 11 shows the range of light colors that are particularly excellent in whiteness. Note that FIG.
Indicates the range where the whiteness response is 95 points or more, and the chromaticity point (u, v) on the CIE1960uv chromaticity diagram.
, (0.224, 0.341), (0.244, 0.
341) and (0.229, 0.333). Therefore, it was confirmed that a light source having a light source color within this range can recognize a white one as more clearly white.

Another problem is the glare of the light source. When light that feels dazzling enters the eyes, it not only feels uncomfortable, but also makes it difficult to see the surroundings accurately. Regarding the relationship between the light color of the light source and the discomfort glare, it has been reported by Yano et al. That the discomfort glare is less likely to be felt as the color temperature is lower (“Relationship with discomfort glare light color of the elderly”, Journal of Lighting Society, Vol. .77, No6, 1993). Therefore, we also examined the glare of the light source in the color temperature range that is considered to be used for headlights.

As an experiment, an experiment was conducted to clarify how much glare is perceived by the light source under the condition that the correlated color temperature of the light color of the light source is variously changed. 3 in the experiment
The subject was made to judge the brightness at which the same glare as when looking at the 000K light source was seen.

This is to judge the brightness for perceiving glare when viewing light sources having different correlated color temperatures, where the brightness for perceiving glare when viewing a 3000 K light source is 1. The result is shown in FIG. From this, it was confirmed that the higher the correlated color temperature (K), the lower the brightness at which glare was felt.

As a result of further analysis, the correlated color temperature was 3800.
The brightness to feel glare when looking at a light source below K and the brightness to feel glare when viewing a light source with a correlated color temperature of 4000K.
It became clear that there was a significant difference at a significance level of 5%. That is, it was found that the light source having a correlated color temperature of 3800K or less significantly reduced discomfort glare as compared with the light source having a correlated color temperature of 4000K.

Next, a halogen light bulb having a color temperature of 3100K and a light source having a different color temperature from the halogen light bulb are respectively set at 10000 cd /
The subjects were made to evaluate the difference in light color between these two types of light sources when they were simultaneously turned on under the condition of m ² .

The subject is allowed to select one of five categories of light color difference, which is “not felt at all”, “slightly felt”, “feeled”, “pretty felt”, and “strongly felt”. The color difference was evaluated. The result is shown in FIG. From this result, it is clear that the light of the lamp with a color temperature of 3400K or higher can be easily visually recognized as the difference of the light color from the light of the halogen bulb. Therefore, the headlight of the light with a correlated color temperature of 3400K or higher is the current halogen light. It was confirmed that the light color can be differentiated from the headlight using a light bulb.

The chromaticity ranges having the effects of the present invention are summarized in FIG. 1 in the CIE1960uv chromaticity diagram. In FIG. 1, reference numeral 1 is a chromaticity range with excellent color discrimination, reference numeral 2 is a range with excellent whiteness, and reference numeral 3 is a correlation color temperature 38 which is a boundary at which glare due to illumination is less likely to be sensed.
A color temperature line of 00K, symbol 4 is a correlation color temperature 34 which is a boundary for easily recognizing a difference in light color from a halogen bulb.
00K isotherm temperature lines are shown.

The light source of low color temperature having the chromaticity point of the light color within both the chromaticity range excellent in color discrimination and the range excellent in whiteness described in the present invention has color discrimination. It goes without saying that it means a low color temperature light source that is excellent in whiteness and excellent in whiteness. Further, the chromaticity point of the light color of the light source is the correlated color temperature 38.
When it is in the range on the lower color temperature side of the color temperature curve of 00K, in addition to the effect of color discrimination and whiteness, it is possible to obtain the effect that glare due to illumination is hardly felt. When the chromaticity point of the light color of the light source is in the range on the higher color temperature side of the color temperature line of the correlated color temperature of 3400K, in addition to the effect on the color discrimination and the feeling of whiteness, the glare caused by the illumination is reduced. The effect that is hard to feel and the difference in light color from the headlights used with halogen bulbs can be differentiated.

Further, by enclosing xenon gas in the arc tube, the luminous flux rising characteristic can be improved. It is considered that this is because xenon is a gas at room temperature and emits visible light during discharge.

The filling pressure of xenon gas is 5 atm or more 20
It is preferable to set it to atm or less. This makes it possible to further improve the luminous flux rising characteristics and prevent the arc tube from bursting.

In FIG. 1, the chromaticity range of the light color of the low color temperature light source having a correlated color temperature of 3400 K or more and 3800 K or less, which is excellent in both color discrimination and whiteness, is shown by diagonal lines.

The light source having the above effects can be achieved by using a headlamp discharge lamp having a structure in which a metal halide is enclosed in an arc tube.

The arc tube is equipped with at least a pair of electrodes and is filled with a metal halide and a rare gas. The distance d between the tips of the electrodes is 8 mm or less, and the arc tube inner diameter D in the middle between the electrodes is 5 mm or less. The applied power at lighting is 70 W or less, and the lamp efficiency at lighting is 50 lm /
A discharge lamp of W or more may be used. For a headlamp having the effect of the present invention, by appropriately determining the composition of the metal halide, the filling amount, the distance d between the tips, and the inner diameter D of the arc tube in the middle between the electrodes in the discharge lamp of this configuration. A discharge lamp is achieved.

As the metal halide, at least sodium halide is filled in an amount of 50% by weight or more based on the total amount of the metal halide enclosed, whereby a headlamp discharge lamp having the effects of the present invention can be obtained. . This is because it is possible to obtain highly efficient red light emission by encapsulating a sodium halide. If the amount of sodium halide enclosed falls below this range, the effect of the present invention and the lamp efficiency of 50 lm /
I cannot satisfy more than W at the same time.

Embodiments of the light source of the present invention will be described below. FIG. 14 shows a discharge lamp according to an embodiment of the present invention. The light emitting tube 5 includes a light emitting portion 5a, sealing portions 5b and 5c that are flatly sealed at both end portions thereof, and a cylindrical portion 5d that is connected to one end portion on the sealing portion 5c side. I have it. Further, the arc tube 5 has its end on the cylindrical portion 5d side inserted into the center of a container 7 made of a resin such as polyetherimide, and held in the container 7 by a holder 8 made of a conductor and an outer tube 6. There is. Further, the light emitting portion 5a has a pair of electrodes 9
a, 9b, and mercury, a metal halide, and xenon as a starting gas are enclosed inside. Metal foils 10a and 10b are embedded in the respective sealing portions 5b and 5c. One end of the electrode 9a is connected to one end of the metal foil 10a, and the tip of the other end of the electrode 9a is installed so as to be located inside the light emitting unit 5a. Further, one end of the external lead wire 11a is connected to the other end of the metal foil 10a. Furthermore, the external lead wire 11a includes the sealing portion 5c to the cylindrical portion 5d.
And is connected to the base 12a. Similarly, the metal foil 10b, the electrode 9b, and the external lead wire 11b are also connected,
Further, the other end of the external lead wire 11b is connected to the power supply line 13
Is connected to one end of the power supply line 13 and the other end of the power supply line 13 is connected to the base 1
It is connected to 2b. The outer tube 6 is attached to both ends of the arc tube 5.

In the discharge lamp shown in FIG. 14, the arc tube 5
The inner volume was 0.025 cc and the arc length was 4.2 mm. Further, 50 mg of mercury, 10 atm of xenon gas and a metal halide were enclosed in the arc tube 1. 0.2 mg of a mixture of scandium iodide and sodium iodide as metal halides having various mixing ratios, and chromaticity points (u) when the discharge lamp enclosed in the arc tube 5 was turned on at 35 W and 50 W, respectively. , V), the lamp efficiency at the time of 35 W lighting, and the result of the luminous flux maintenance factor after lighting at 35 W for 1000 hours are shown in Table 1.

[0059]

[Table 1]

From Table 1, 0.75≤W _Na / (W _Sc +
W _Na ) <1 (Equation 1), a lamp A of which 35 W and 50 W, a lamp B of 50 W, a lamp C of 35 W and 50 W, a lamp D of 35 W and a lamp E of 35 W are used. It was shown that by adjusting the applied power at the time of lighting, a headlamp discharge lamp having the effect of the present invention can be achieved. Furthermore, 0.
It is preferable to encapsulate an encapsulated material satisfying the relationship of 80 ≦ W _Na / (W _Sc + W _Na ) <1 as a metal halide. In a headlamp discharge lamp containing a scandium halide, it is known that the linear transmittance of the arc tube, called devitrification, decreases due to the reaction between scandium and quartz which is a constituent material of the arc tube. By using a metal halide having a composition in this range, devitrification can be suppressed, and a luminous flux maintenance factor of 70% or more can be achieved after lighting at 35 W for 1000 hours.

On the other hand, the lamp F of Comparative Example 1 has 35
When lighting W and 50W, it deviates from the shaded area in FIG.
Moreover, it was not preferable because it was out of the lower limit of the formula 1. The lamp G of Comparative Example 2 was not preferable because the lamp G deviated from the shaded portion in FIG.

Further, in the discharge lamp shown in FIG. 14, a mixture of scandium iodide as a metal halide, sodium iodide and thorium iodide in various mixing ratios of 0.2.
Discharge lamp with 35 mg enclosed in arc tube 35W, 50
Each chromaticity point (u, v) when illuminated with W, 35
Table 2 shows the results of the lamp efficiency at W lighting and the luminous flux maintenance factor after lighting at 35 W for 1000 hours.

[0063]

[Table 2]

From Table 2, 0.75 ≦ W _Na / (W _Sc +
50 W of the lamp H, 50 W of the lamp I and 50 W of the lamp J in which an enclosure satisfying the relationship of W _Na ) −W _Th / (W _Sc + W _Na + W _Th ) <1 (Formula 2) is enclosed as a metal halide.
In W, 35 W and 50 W of lamp K, 35 W and 50 W of lamp L, and 35 W and 50 W of lamp M, the headlamp discharge lamp having the effect of the present invention is achieved by adjusting the applied power at the time of lighting. I was able to confirm that

On the other hand, the lamp N of Comparative Example 3 has 35 lamps.
When lighting W and 50W, it deviates from the shaded area in FIG.
Further, it was not preferable because it was out of the lower limit of the equation (2).

Further, in the discharge lamp shown in FIG. 14, a mixture of scandium iodide as a metal halide, sodium iodide, and thallium iodide in various mixing ratios of 0.2.
Discharge lamp with 35 mg enclosed in arc tube 35W, 50
Table 3 shows the results of the chromaticity points (u, v), the lamp efficiency, and the luminous flux maintenance factor after lighting at 35 W for 1000 hours when lighting at W.

[0067]

[Table 3]

From Table 3, 0.75 ≦ W _Na / (W _Sc +
W _Na ) <1 (equation 1) and W _Tl / (W _Sc + W _Na + W _Tl ) ≦
35W of the lamp O and 35W of the lamp P in which an enclosure satisfying the relationship of 0.03 (formula 3) is enclosed as a metal halide.
W and 50W, lamp Q 35W and 50W, lamp R
It was confirmed that the headlamp discharge lamp having the effect of the present invention can be achieved by adjusting the applied power at the time of lighting at 35 W and 50 W.

On the other hand, the lamps S and T of Comparative Examples 4 to 5 were not preferable because they were out of the shaded area in FIG. 1 at the time of lighting 35 W and 50 W and also out of the lower limit of the formula 1. The lamp U of Comparative Example 6 has 35W and 50W.
In lighting up, it was not preferable because it was out of the shaded area in FIG. 1 and out of the range of Expression 1 and Expression 2. The lamp W of Comparative Example 7 was not preferable because it was out of the shaded area in FIG. 1 and out of the range of Expression 2 at the lighting of 35 W and 50 W.

Further, in the discharge lamp shown in FIG. 14, a discharge in which 0.2 mg of a mixture of scandium iodide and sodium iodide, thorium iodide, and thallium iodide were mixed as the metal halide in the arc tube 5 was enclosed. Chromaticity points (u, v) when the lamp is turned on at 35 W and 50 W, lamp efficiency when turned on at 35 W, and 10 at 35 W
Table 4 shows the results of the luminous flux maintenance factor after lighting for 00 hours.

[0071]

[Table 4]

From Table 4, 0.75 ≦ W _Na / (W _Sc +
W _Na ) -W _Th / (W _Sc + W _Na + W _Th ) <1 (equation 2), and -0.05 ≦ W _Th / (W _Sc + W _Na + W _Th ) -2 × W _Tl
/ (W _Sc + W _Na + W _Th + W _Tl ) (Equation 4)
0 W, lamp b 50 W, lamp c 50 W, lamp d
50W of lamp, 50W of lamp e, 35W of lamp f and 5
It was confirmed that at 0 W and at 35 W and 50 W of the lamp g, the headlamp discharge lamp having the effect of the present invention can be achieved by adjusting the applied power during lighting.

On the other hand, the lamp h of Comparative Example 8 has 35
When lighting W and 50W, it deviates from the shaded area in FIG.
Further, it was out of the range of formula 4, which was not preferable.

Further, in the discharge lamp shown in FIG. 14, 0.2 mg of a mixture of scandium iodide and sodium iodide, thorium iodide, thallium iodide and cesium iodide as metal halides having various mixing ratios was used in the arc tube 5. The respective chromaticity points (u, v) when the discharge lamp enclosed in 35 W and 50 W is lit, the lamp efficiency when 35 W is lit,
Table 5 shows the results of the luminous flux maintenance factor after 1000 hours of lighting at 35W.
Shown in.

[0075]

[Table 5]

From Table 5, 0.75 ≦ [W _Na / (W _Sc + W
_Na )]-[W _Th / (W _Sc + W _Na + W _Th )] <1 (Formula 2),
−0.05 ≦ [W _Th / (W _Sc + W _Na + W _Th )] − 2 × [W
_Tl / (W _Sc + W _Na + W _Th + W _Tl )] (Equation 4)
50W of lamp, 50W of lamp j, 50W of lamp k, 35W and 50W of lamp 1, 35W and 50W of lamp m
It was confirmed that the headlamp discharge lamp having the effect of the present invention can be achieved by adjusting the applied power during lighting. That is, Table 5 shows that by enclosing cesium, a headlamp discharge lamp having the effect of the present invention as well as the effect of increasing the luminous flux maintenance factor during the life can be obtained.

On the other hand, the lamp efficiency decreased as the amount of cesium halide filled increased, and the lamps of Comparative Examples 9 to 10 in which the amount of cesium halide filled exceeded 10% by weight. At n and o, the lamp efficiency was below 50 lm / W. From this fact, the enclosed amount of cesium halide has a lamp efficiency of 5
It is preferably 10% by weight or less, which can achieve 0 lm / W.

By providing an outer tube having a linear transmittance of light of 350 nm of 30% or less and a linear transmittance of light of 450 nm of 70% or more as an outer tube of the discharge lamp, the luminaire has the effect of the present invention. A discharge lamp for a headlight having the effect of reducing the amount of harmful ultraviolet radiation that causes deterioration of A quartz glass material is preferably used as the material of the outer tube. Since quartz glass has a high linear transmittance of visible light and excellent heat resistance, it is possible to obtain a headlamp discharge lamp having high efficiency and durability. Further, it is preferable that the quartz glass contains at least one element selected from the group consisting of oxidized cerium, titanium, iron, praseodymium and europium. Quartz glass containing elements of these groups has the effect of lowering the linear transmittance of ultraviolet rays having a wavelength of 380 nm or less while maintaining the linear transmittance of visible light of 380 to 780 nm. Therefore, by using quartz glass containing this group of elements as the outer tube, a headlamp discharge lamp having the effect of reducing the amount of harmful ultraviolet radiation can be obtained.

Since the outer tube has a structure in which at least one end of the arc tube is sealed, color discrimination is excellent, glare due to illumination is less likely to be felt, and the effect of the present invention is combined with seismic resistance of the discharge lamp. A discharge lamp having excellent impact resistance can be obtained.

By arranging the inner diameter of the outer tube to be 12 mm or less, the effect of the present invention and the change in the temperature of the coldest point of the arc tube due to the lighting condition are reduced, so that a constant light color and luminous flux are applied. A discharge lamp having the effect is obtained. Although the case where iodide is used as the metal halide has been described as an embodiment of the present invention, similar effects can be obtained with other halides such as bromide and combinations thereof.

It is to be noted that the object of the present invention to properly see the colors of illuminated various color objects and to reduce unpleasant glare is to select the visible light, which makes the light from the light source have an appropriate chromaticity. It is also achieved by using an outer tube having a positive absorption.

The object of the present invention to properly see the colors of illuminated various color objects and to reduce unpleasant glare is to provide a transmitting plate and a reflecting plate that make the light from the light source have an appropriate chromaticity. It is also achieved by using a headlamp fixture having at least one of the above.

[0083]

As described above, according to the present invention, in a high-efficiency high-pressure discharge lamp, it is possible to obtain a lamp for an automobile headlight and a headlight which suppress unpleasant glare and have excellent color appearance. it can.

[Brief description of drawings]

FIG. 1 is a chromaticity range of each light color having an effect of the present invention (a chromaticity range excellent in color discrimination, a chromaticity range in which discomfort glare is less likely to be felt, a chromaticity range excellent in whiteness, and a halogen bulb). CIE1960u, which is a range of chromaticity that enables light color differentiation
FIG. 6 is a diagram that is generally shown in the v chromaticity diagram.

FIG. 2 is a diagram showing a chromaticity range of a light source color in which it is easy to distinguish red in the CIE1960uv chromaticity diagram.

FIG. 3 is a diagram showing a chromaticity range of a light source color in which it is easy to distinguish green in the CIE1960uv chromaticity diagram.

FIG. 4 is a diagram showing a chromaticity range of a light source color in which it is easy to distinguish blue in the CIE1960uv chromaticity diagram.

FIG. 5 is a diagram showing chromaticity ranges of light source colors in which it is easy to distinguish colors of all categories in the CIE1960uv chromaticity diagram.

FIG. 6 is a diagram showing a chromaticity range of a light source color that is particularly easy to distinguish red in the CIE1960uv chromaticity diagram.

FIG. 7 is a diagram showing a chromaticity range of a light source color in the CIE1960uv chromaticity diagram, which is particularly easy to distinguish green.

FIG. 8 is a diagram showing a chromaticity range of a light source color that is particularly easy to discriminate blue in the CIE1960uv chromaticity diagram.

FIG. 9 is a diagram showing a chromaticity range of a light source color in which it is particularly easy to distinguish colors of all categories in the CIE1960uv chromaticity diagram.

FIG. 10 is a diagram showing a chromaticity range of a light source color in which a high whiteness is obtained in the CIE1960uv chromaticity diagram.

FIG. 11 is the same as in the CIE1960uv chromaticity diagram,
The figure which shows the chromaticity range of the light source color in which a particularly high white feeling is obtained.

FIG. 12 is a diagram showing the relationship between the correlated color temperature of the light source and the brightness of the light source that causes glare.

FIG. 13 is a diagram showing a sensational relationship between the correlated color temperature of the light source and the difference in light color between the halogen bulb and the same.

FIG. 14 is a partially cutaway front view of the headlamp discharge lamp according to the embodiment of the present invention.

[Explanation of symbols]

1 Chromaticity range with excellent color discrimination 2 Chromaticity range with excellent whiteness 3 Correlated color temperature of 3800K 4 Correlated color temperature of 3400K 5 arc tube 5a light emitting part 6 outer tube 9a, 9b electrodes

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI H01J 61/88 (72) Inventor Tetsuji Takeuchi 1-1, Saiwaicho, Takatsuki City, Osaka Prefecture Matsushita Electronic Industrial Co., Ltd. (56) Reference Reference JP 62-131459 (JP, A) JP 61-64060 (JP, A) JP 7-130331 (JP, A) JP 5-225959 (JP, A) JP 5- 205697 (JP, A) JP-A-3-214558 (JP, A) JP-A-2-7347 (JP, A) JP-A-8-510357 (JP, A) International Publication 98/036441 (WO, A1) (JP 58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 61/44 F21S 8/10 F21V 14/00 H01J 61/20 H01J 61/34 H01J 61/88

Claims (20)

(57) [Claims] 1. An arc tube in which xenon gas is enclosed is provided, and a chromaticity point of light color is a chromaticity point (u, v) = (0.224,0.331 on a CIE1960uv chromaticity diagram. )
With the major axis at 0.080 and the minor axis at 0.024
It is within the range of an ellipse with an inclination of 35 degrees from the axis, and the major axis is 0.060 with the chromaticity point (u, v) = (0.220, 0.332) as the center and the minor axis is 0. 022 is within the range of an ellipse with an inclination of 15 degrees from the u axis, and the major axis is 0.060 with the chromaticity point (u, v) = (0.235, 0.335) as the center and the minor axis is There 0.030 in Ri slope near the range of the ellipse is 30 degrees from the u axis, the the arc tube further is sealed metal halide
And the metal halide is a sodium halide
The total amount of metal halide contained is
A discharge lamp for an automobile headlight, characterized by being 50% by weight or more . 2. A generator containing xenon gas inside.
Equipped with a light tube, the chromaticity point of the light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.224, 0.331)
With the major axis at 0.080 and the minor axis at 0.024
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.220, 0.332)
The major axis is 0.060 and the minor axis is 0.022.
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.235,0.335)
The major axis is 0.060, the minor axis is 0.030 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
Compounds and scandium halides, and
Includes aluminum halide and thallium halide
First, the amount of sodium
The amount of halide enclosed is W _Na wt% and scandium is
When the amount of enclosed androgenic compound was W _{Sc wt%, 90 <W Na + W} Sc, _{and, 0.75 ≦ W Na / (W} Sc + W Na) < irradiation before automobile and satisfying one of the relationships Electric discharger for light
Pump. 3. A generator having xenon gas sealed inside.
Comprising a light tube, the chromaticity point of light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.224, 0.331)
With the major axis at 0.080 and the minor axis at 0.024
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.220, 0.332)
The major axis is 0.060 and the minor axis is 0.022.
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.235,0.335)
The major axis is 0.060, the minor axis is 0.030 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
And thallium halides, and
It does not contain halides, and the total amount of metal halides is included.
The amount of thorium halide to be filled is W _Th wt%
Then, 90 <W _Na + W _Sc + W _Th , and 0.75 ≦ [W _Na / (W _Sc + W _Na )] − [W _Th / (W _Sc
+ W _Na + W _Th )] <1
Discharge lamp for vehicle headlights. 4. A generator having xenon gas sealed inside.
Equipped with a light tube, the chromaticity point of the light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.224, 0.331)
With the major axis at 0.080 and the minor axis at 0.024
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.220, 0.332)
The major axis is 0.060 and the minor axis is 0.022.
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.235,0.335)
The major axis is 0.060, the minor axis is 0.030 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
Compounds, scandium halides and thallium halogens
Halide, and does not contain thorium halide,
Halogenation of thallium relative to total metal halide loading.
When the amount of the encapsulating compound is W _Tl weight%, 90 <W _Na + W _Sc + W _Tl , 0.75 ≦ W _Na / (W _Sc + W _Na ) <1, and W _Tl / (W _Sc + W _Na + W _Tl ) ≦ 0.03 , which is a discharge lamp for an automobile headlight.
Pump. 5. A generator having xenon gas sealed inside.
Equipped with a light tube, the chromaticity point of the light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.224, 0.331)
With the major axis at 0.080 and the minor axis at 0.024
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.220, 0.332)
The major axis is 0.060 and the minor axis is 0.022.
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.235,0.335)
The major axis is 0.060, the minor axis is 0.030 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
Compounds, scandium halides, thorium halogens
Include halides of halide and _{thallium, 90 <W Na + W Sc} + W Th + W Tl, 0.75 ≦ [W Na / (W Sc + W Na)] - [W Th / (W Sc +
W _Na + W _Th )] <1 and -0.05 ≦ [W _Th / (W _Sc + W _Na + W _Th )]-2
× [W _Tl / (W _Sc + W _Na + W _Th + W _Tl )]
A discharge lamp for a vehicle headlight, which is characterized in that 6. An arc tube in which xenon gas is enclosed is provided, and the chromaticity point of the light color is on the CIE1960uv chromaticity diagram, the chromaticity point (u, v) = (0.221,0.329). )
With the major axis at 0.047 and the minor axis at 0.014
It is within the range of an ellipse with an inclination of 35 degrees from the axis, and the major axis is 0.040 with the chromaticity point (u, v) = (0.224, 0.334) as the center and the minor axis is 0. 015 is within the range of an ellipse whose inclination from the u axis is 15 degrees, and the major axis is 0.037 with the chromaticity point (u, v) = (0.236,0.339) as the center, and the minor axis is There 0.013 in Ri slope near the range of the ellipse is 30 degrees from the u axis, the the arc tube further is sealed metal halide
And the metal halide is a sodium halide
The total amount of metal halide contained is
A discharge lamp for an automobile headlight, characterized by being 50% by weight or more . 7. A generator having xenon gas sealed inside.
Equipped with a light tube, the chromaticity point of the light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.221, 0.329 )
With the major axis at 0.047 and the minor axis at 0.014
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.224, 0.334)
The major axis is 0.040, the minor axis is 0.015
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.236, 0.339)
The major axis is 0.037, the minor axis is 0.013 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
Compounds and scandium halides, and
Includes aluminum halide and thallium halide
First, the amount of sodium
The amount of halide enclosed is W _Na wt% and scandium is
When the amount of enclosed androgenic compound was W _{Sc wt%, 90 <W Na + W} Sc, _{and, 0.75 ≦ W Na / (W} Sc + W Na) < irradiation before automobile and satisfying one of the relationships Electric discharger for light
Pump. 8. A generator having xenon gas sealed inside.
Equipped with a light tube, the chromaticity point of the light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.221,0.329)
With the major axis at 0.047 and the minor axis at 0.014
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.224, 0.334)
The major axis is 0.040, the minor axis is 0.015
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.236, 0.339)
The major axis is 0.037, the minor axis is 0.013 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
And thallium halides, and
It does not contain halides, and the total amount of metal halides is included.
The amount of thorium halide to be filled is W _Th wt%
Then, 90 <W _Na + W _Sc + W _Th , and 0.75 ≦ [W _Na / (W _Sc + W _Na )] − [W _Th / (W _Sc
+ W _Na + W _Th )] <1
Discharge lamp for vehicle headlights. 9. A generator having xenon gas sealed inside.
Comprising a light tube, the chromaticity point of light color is CIE1960uv chromaticity diagram
Above, the chromaticity point (u, v) = (0.221,0.329)
With the major axis at 0.047 and the minor axis at 0.014
Is in the range of an ellipse with an inclination of 35 degrees from the axis, and
Chromaticity point (u, v) = (0.224, 0.334)
The major axis is 0.040, the minor axis is 0.015
Is within the range of an ellipse with an inclination of 15 degrees and the chromaticity point
Centering around (u, v) = (0.236, 0.339)
The major axis is 0.037, the minor axis is 0.013 and the inclination from the u axis
Is within the range of an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
Compounds, scandium halides and thallium halogens
Halide, and does not contain thorium halide,
Halogenation of thallium relative to total metal halide loading.
When the amount of the encapsulating compound is W _Tl weight%, 90 <W _Na + W _Sc + W _Tl , 0.75 ≦ W _Na / (W _Sc + W _Na ) <1, and W _Tl / (W _Sc + W _Na + W _Tl ) ≦ 0.03 , which is a discharge lamp for an automobile headlight.
Pump. 10. A xenon gas is enclosed inside.
Equipped with an arc tube, the chromaticity point of light color is CIE1960uv chromaticity
On the figure, chromaticity point (u, v) = (0.221, 0.32
The major axis is 0.047, and the minor axis is 0.014 with 9) as the center.
Is within the range of an ellipse whose inclination from the u axis is 35 degrees,
And the chromaticity point (u, v) = (0.224,0.334)
The major axis is 0.040, the minor axis is 0.015, and the u axis is the center.
Is within the range of an ellipse with an inclination of 15 degrees from
Centering around the point (u, v) = (0.236, 0.339)
The long axis is 0.037 and the short axis is 0.013.
The inclination is within an ellipse of 30 degrees , and a metal halide is further enclosed in the arc tube.
And the metal halide is a halogenated sodium
Compounds, scandium halides, thorium halogens
Include halides of halide and _{thallium, 90 <W Na + W Sc} + W Th + W Tl, 0.75 ≦ [W Na / (W Sc + W Na)] - [W Th / (W Sc +
W _Na + W _Th )] <1 and -0.05 ≦ [W _Th / (W _Sc + W _Na + W _Th )]-2
× [W _Tl / (W _Sc + W _Na + W _Th + W _Tl )]
A discharge lamp for a vehicle headlight, which is characterized in that 11. The chromaticity point of the light color is (0.221, 0.3) on the CIE1960uv chromaticity diagram.
45), (0.252, 0.345), (0.248,
0.338), (0.231, 0.330) The discharge lamp for a vehicle headlamp according to any one of claims 1 to 10, which is in a range surrounded by four points. 12. The chromaticity point of light color is (0.224, 0.3) on the CIE1960uv chromaticity diagram.
41), (0.244, 0.341), (0.229,
In the range surrounded by three points of 0.333) according to claim 1
10. The discharge lamp for an automobile headlight according to any one of 10 . 13. chromaticity point of light color on the diagram CIE1960uv chromaticity, according to any one of claims 1 to 10 in which the correlated color temperature is in the range than the isotemperature line of the low color temperature side of 3800K Discharge lamp for automobile headlights. 14. chromaticity point of light color on the diagram CIE1960uv chromaticity, according to any one of claims 1 to 13 correlated color temperature is in the range as high color temperature side than the isotemperature line of 3400K Discharge lamp for automobile headlights. 15. The method of claim 1-14 headlamp vehicle characterized by comprising a vehicle headlights discharge lamp according to any one of. 16. At least a pair of electrodes is provided, the distance d between the tips of the electrodes is 8 mm or less, the arc tube inner diameter D in the middle between the electrodes is 5 mm or less, and the applied power W at lighting is 70 W or less. , Lamp efficiency at lighting is 50lm
/ W or more, The discharge lamp for motor vehicle headlights in any one of Claims 1-10. 17. The discharge lamp for an automobile headlamp according to claim 1 , wherein a cesium halide is filled as the metal halide in an amount of 10% by weight or less based on a total amount of the metal halide filled. . 18. The linear transmittance of 350 nm light is 30%.
The discharge lamp for a vehicle headlamp according to any one of claims 1 to 10, which has a structure including an outer tube having a linear transmittance of light of 450 nm of 70% or more. 19. A discharge lamp for a vehicle headlamp having a discharge lamp according to claim 18 , wherein the outer tube has a structure in which at least one end of the arc tube is sealed. 20. The discharge lamp for a vehicle headlamp according to claim 18 , wherein the inner diameter of the outer tube is 12 mm or less.