JPH11176390A - Halogen lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a halogen lamp with a high color temperature type of color temperature changeable film showing a blue, capable of more improving a color temperature and radiating white light with high purity. SOLUTION: A sub-filament 2a and a main filament 2b are provided in parallel to a center axis in a heat-resistant and transparent glass bulb 1 made of silica glass or others and a reflecting mirror 4 is mounted on the sub-filament 2a. A high color temperature type of color temperature changeable film 8 is formed on the outer surface of the glass bulb 1, which has a blue colored film layer formed of at least one layer of composite oxide of silicon oxide, cobalt oxide and phosphorus oxide and laminated, and a multilayer interference film 9 is provided thereon, which has a high-refraction-factor layer formed of titanium oxide and a low-refraction-factor layer formed of silicon oxide, both alternately laminated, so that a halogen lamp with a color temperature more improved can be constructed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen lamp, and more particularly to a halogen lamp which emits high-purity white light and which is suitable for a headlight, a fog lamp, and a general light source for automobiles.

[0002]

2. Description of the Related Art Conventional halogen bulbs used for headlamps and fog lamps of automobiles and halogen bulbs for general lighting are white light having a reddish tint. By reducing this red tint, the halogen bulb can be brought into a higher color temperature state. As a means for reducing the red tint, an optical thin film of a high color temperature type filter based on the optical interference theory in which a high refractive index layer such as titanium oxide and a low refractive index layer such as silicon oxide are alternately laminated is applied to the valve surface. Has been conventionally used as one effective method.

[0003] On the other hand, the present inventor has previously described Japanese Patent Application No.
No. 168,691 proposed a halogen bulb which easily emits high-purity white light without a complicated operation for forming an optical thin film based on the theory of light interference, and a method for manufacturing the same. That is, a color temperature conversion film (high color temperature type color temperature conversion film) of at least one layer of a blue colored film made of a composite oxide of silicon oxide, cobalt oxide, and phosphorus oxide was formed on the outer surface of the halogen bulb. Suggested ones. By forming a color temperature conversion film composed of one or more blue colored films in this way, it is possible to easily obtain a halogen bulb that emits high-purity white light without color unevenness without requiring complicated operations. Was done.

[0004] The composition of the composite oxide constituting the color temperature conversion film composed of the blue colored film will be described in detail. The composite oxide of silicon oxide, cobalt oxide and phosphorus oxide has a mole fraction of 0.086 ≦ x ≦ 0.804, 0.194 ≦ y ≦ 0.62
3, 0.002 ≦ z ≦ 0.291 (x = SiO ₂ , y = CoO, z = P
₂ O ₅ ) and x + y + z = 1.000.

The reasons for setting the composition of the composite oxide as described above are as follows. In other words, the lower limit of the composition of the blue colored film composed of a composite oxide of silicon oxide, cobalt oxide and phosphorous oxide is 0.804 mol fraction of silicon oxide, 0.194 mol fraction of cobalt oxide and 0.002 mol fraction of phosphoric oxide. This is because, as the concentration of cobalt oxide is further reduced, the degree of coloring of blue decreases, and the film thickness must be further increased in order to achieve a desired color temperature. . However, the lower limit setting is hardly affected by the concentration of phosphor oxide. The upper limit is set to 0.086 mole fraction of silicon oxide, 0.623 mole fraction of cobalt oxide, and 0.291 mole fraction of phosphorous oxide. The color changes from dark brown to black brown as the color goes, and the color changes from blue. Therefore, by defining the composition of the composite oxide constituting the color temperature conversion film composed of a blue colored film as described above, it is possible to easily and accurately form a color temperature conversion film composed of a blue colored film having desired characteristics. Can be.

The inventor of the present invention has previously described Japanese Patent Application No. 9-183.
No. 205, a high-color-temperature-type color temperature conversion film exhibiting a blue color composed of at least one layer of a composite oxide of silicon oxide, cobalt oxide and phosphorous oxide is formed on the outer surface of a halogen bulb by coating. At least one protective film made of silicon oxide or a composite oxide of silicon oxide and phosphorus oxide is formed on the color temperature type color temperature conversion film, and the protective film is formed in a high-temperature and high-humidity environment (at a temperature of 70 ° C. or more and a humidity of 60% or more). In (2), a halogen bulb that emits high-purity white light without causing the high-color-temperature-type color temperature conversion film to peel off from the heat-resistant translucent substrate constituting the bulb has been proposed.

[0007]

By using the color temperature conversion film (high color temperature type color temperature conversion film) composed of the above-mentioned blue colored film proposed by the present inventor, high-purity white light can be obtained. Although a halogen lamp that emits light can be obtained, a halogen lamp with a high color temperature that emits even higher purity white light has been demanded in order to improve the visibility of an object to be irradiated.

Accordingly, an object of the present invention is to provide a halogen bulb which emits white light having a higher color temperature than a halogen bulb using a color temperature conversion film composed of a blue coloring film as previously proposed. It is.

[0009]

In order to solve the above-mentioned problems, the present invention provides at least one layer of silicon oxide and cobalt oxide on the outer surface of a halogen lamp bulb made of a heat-resistant and translucent substrate having a filament inside. A high color temperature type color temperature conversion film exhibiting a blue color composed of a composite oxide of phosphorus and a phosphoric acid is applied and formed, and a high refractive index layer and a low refractive index layer are alternately further formed on the high color temperature type color temperature conversion film. This is to provide a multilayer interference film formed by lamination. Note that the expression of blue means that the transmitted light of the high color temperature type color temperature conversion film looks blue.

As described above, by further providing the multilayer interference film on the high color temperature type color temperature conversion film exhibiting blue, the color temperature conversion film having a higher color temperature than when simply providing the high color temperature type color temperature conversion film exhibiting blue is provided. It can emit white light of color temperature.
Further, the multilayer interference film is made of a high color temperature type color temperature conversion filter exhibiting a hue mainly containing blue, thereby further increasing the color temperature and yellowing when the non-lighting is performed from the outer surface of the high color temperature type color temperature conversion filter. Reflected light of red or a mixed color thereof is generated, thereby giving the appearance an appearance of yellow, red or a mixed color thereof, and has additional effects such as being noticeable at the time of exhibition. Can be

Next, the reason why the color temperature is further increased when a multilayer interference film is provided on the high color temperature type color temperature conversion film exhibiting blue will be described. The high color temperature type color temperature conversion film exhibiting a blue color composed of a composite oxide of silicon oxide, cobalt oxide and phosphor oxide, for example, formed by coating five layers,
It has a spectral transmittance characteristic as shown in FIG. on the other hand,
The multilayer interference film laminated on the blue color temperature conversion film is formed by alternately laminating a high refractive index layer represented by titanium oxide or the like and a low refractive index layer represented by silicon oxide or the like. However, by setting the film thickness and the film configuration variously, the multilayer interference film can give a color in a visible region or reflect a near-infrared region. In the present invention, since the object is to increase the color temperature, a multilayer interference film having a high color temperature type color temperature conversion filter function exhibiting a color mainly containing blue is required.

As this multilayer interference film, for example, titanium oxide is used for the high refractive index layer and silicon oxide is used for the low refractive index layer, and the film configuration is alternately λ / 4TiO ₂ -λ / 8SiO ₂ -λ / 4TiO _2. In the case of a three-layer film, a spectral transmittance characteristic as shown by a curve A in FIG. 2 is exhibited. Similarly, zirconium oxide is used for the high refractive index layer, and a composite film of silicon oxide and phosphorous oxide is used for the low refractive index layer, and λ / 4 TiO ₂ -λ / 4Si
_{O 2 · P 2 O 5 -} ····· after similarly repeatedly laminated to 11 layers, the final layer by laminating a _{λ / 8SiO 2 · P 2 O} 5 1
The multilayer interference film having a two-layer structure has a spectral transmittance characteristic as shown by a curve B in FIG. Note that λ is the center wavelength of the reflection region in the desired spectral transmittance characteristics, and these spectral transmittance characteristics change depending on the type of the substrate, the type of the oxide, the thickness, the film configuration, and the like. .

As can be seen from FIG. 2, the multilayer interference film using titanium oxide and silicon oxide, as shown by the spectral transmittance curve A, transmits light in the vicinity of about 420 to 540 nm, and transmits light of about 630 to 79 nm.
Reflects light centered at 0 nm. Such a multilayer interference film presents light blue because it transmits light centered on blue, and its appearance reflects light centered on yellow and red, so that yellow or red or a mixture of these colors is used. Visible in However, depending on a slight difference in film thickness, light mainly reflecting yellow and red is reflected. For example, when the film thickness is small, the appearance looks yellow, and when the film thickness is large, it looks red. Further, a multilayer interference film using zirconium oxide and a composite film of silicon oxide and phosphorus oxide has a spectral transmittance curve B
As shown by, the light around 360 to 610 nm is transmitted,
Reflects light centered at 10-870 nm. Such a multilayer interference film is almost colorless when viewed from the vertical direction. However, if you change the angle gradually from vertical to horizontal,
The color changes from almost colorless to a color exhibiting blue to purple. That is, since the transmission characteristics have an angle dependence, the light emitted at random increases a color temperature by partially transmitting a color exhibiting blue to purple. Then, since such a multilayer interference film reflects light centered on the red to near-infrared region, the reflected light looks red, and thus the appearance looks red.

In the present invention, for example, a spectral transmittance characteristic as shown by a curve A in FIG. 2 is provided on a high color temperature type color temperature conversion film exhibiting a blue color having a spectral transmittance characteristic as shown in FIG. By providing the multilayer interference film, the overall spectral transmittance characteristic becomes a characteristic shown by a solid line in FIG. FIG. 3 also shows the spectral transmittance characteristics of only the blue color temperature conversion type color temperature conversion film shown in FIG. Comparing the total spectral transmittance characteristic shown in FIG. 3 with the spectral transmittance characteristic of only the high color temperature type color temperature conversion film exhibiting blue, the transmittance in the film configuration according to the present invention is about 490 nm or less, The transmittance is lower than that of the case where only the high color temperature type color temperature conversion film is provided.
That is, in the present invention, it is found that the color of the blue color is further increased by transmitting the transmitted light of the high color temperature type color temperature conversion film exhibiting blue through the multilayer interference film, thereby further increasing the color temperature. As can be seen from the spectral transmittance characteristics of the film configuration according to the present invention shown in FIG.
Since the light is reflected in a wavelength region centered at 590 to 650 nm, yellow reflected light partially including red is obtained. Therefore, the appearance of the halogen bulb can be made fashionable by the reflected light.

[0015]

Next, an embodiment will be described. FIG. 4 is a cross-sectional view showing an embodiment of the halogen bulb according to the present invention. FIG. 5 is a high color temperature type color temperature conversion film having a blue color formed on the outer surface of the bulb and formed thereon. FIG. 4 is a schematic cross-sectional view showing an enlarged multilayer interference film. The halogen lamp according to the present embodiment is obtained by applying the present invention to a lamp used as a headlight of an automobile or the like, and, like the conventional example, is made of a heat-resistant material such as alumina silicate hard glass or quartz glass. And a transparent glass bulb 1 in which two filaments 2a and 2b are provided in parallel with the central axis. The upper subfilament 2a is provided with a reflecting mirror 4 connected to a lead wire 3 in order to prevent light from shining on the oncoming vehicle side, and both ends of the filament 2a are connected to one end of the reflecting mirror 4 by a lead. Connected to line 5. Both ends of the main filament 2b are connected to lead wires 3 and 6, respectively. The lead wires 3, 5, 6 are integrated by a bridge glass 7. On the outer surface of the glass bulb 1, a high color temperature type color temperature conversion film 8 exhibiting blue color and a multilayer interference film 9 provided thereon are formed. 10 is installed. A light-shielding film 11 is formed on the outer surface of the top of the glass bulb 1.

Next, the structure of the high color temperature type color temperature conversion film 8 exhibiting blue color and the multilayer interference film 9 will be described. FIG. 5 is an enlarged schematic cross-sectional view showing the configuration of the laminated portion of the high color temperature type color temperature conversion film 8 and the multilayer interference film 9. In the illustrated example, the multilayer interference film 9 is formed by laminating five layers of a blue colored film layer 81 composed of a composite oxide of silicon oxide, cobalt oxide, and phosphorous oxide. High refractive index layer 91 made of titanium oxide and low refractive index layer made of silicon oxide
It is composed of a high color temperature type color temperature conversion filter in which three layers 92 are alternately laminated. The individual spectral transmittance characteristics of the multicolor interference film 9 composed of the high color temperature type color temperature conversion film 8 and the high color temperature type color temperature conversion filter configured as described above are shown in FIG. 1 and FIG. It has the characteristic as shown by the curve A in FIG. 2, and the spectral transmittance characteristic of the whole obtained by laminating them is a characteristic in which the color temperature is further increased as shown by the solid line in FIG.

Next, a formation agent for a high color temperature type color temperature conversion film composed of a composite oxide of silicon oxide, cobalt oxide and phosphorus oxide, and a multilayer interference film composed of a high color temperature type color temperature conversion filter are mainly used. Titanium oxide forming agent used as high refractive index layer forming substance, silicon oxide forming agent used as low refractive index layer forming substance, and composite oxide of silicon oxide and phosphorous oxide also used as low refractive index layer forming substance Will be described. (1) High Color Temperature Type Color Temperature Conversion Film Forming Agent Consisting of a Silicon Oxide-Cobalt Oxide-Phosphate Composite Oxide First, a solvent in which an alkoxide of cobalt is dissolved, such as benzene, is prepared. This benzene or the like is sufficiently dehydrated. Next, using this benzene solution or the like, cobalt alkoxide, for example, diisopropoxide cobalt Co (OiC ₃ H ₇ ) ₂ , and silicon alkoxide, for example, tetraethoxysilicate Si (OC ₂ H ₅ ) ₄ are mixed at a predetermined ratio. Dissolve while flowing dry nitrogen for several hours,
After thorough mixing, a predetermined amount of dehydrated ethanol is added. Then, an ethanol solution containing a predetermined amount of pure water is slowly and carefully added so as not to cause precipitation, and a hydrolysis reaction is performed. Furthermore, in order to prevent gelation due to this reaction, acetylacetone (C ₅ H ₈ O
₂ ), ethyl acetoacetate (C ₆ H ₁₀ O ₃ ), etc. are added, and the mixture is further reacted for several hours. Then, benzene, ethanol, etc. are taken out by distillation under reduced pressure. After allowing the reaction product to stand for a while, an ethanol solution in which a predetermined amount of a phosphorus compound such as diphosphorus pentoxide or isopropyl acid phosphate is dissolved is added. Further, an organic solvent such as ethanol or ethyl acetate is added to adjust the concentration and viscosity of the solution to predetermined values. (2) High refractive index layer forming agent composed of titanium oxide Titanium alkoxide, for example, tetrabutoxytitanium Ti (O
Add organic solvent such as ethanol and ethyl acetate to the organic titanium compound obtained by chelating -C ₄ H ₉ ) ₄ with acetylacetone (C ₅ H ₈ O ₂ ), and adjust the concentration and viscosity of the solution to predetermined values. . (3) Low refractive index layer forming agent composed of silicon oxide Organosilicon compound, for example, tetraethoxysilicate Si
(OC ₂ H ₅ ) ₄ is prepared. A predetermined amount of ethanol and pure water are added to carry out a hydrolysis reaction, and further, an organic solvent such as ethanol and ethyl acetate is added to adjust the concentration and viscosity of the solution to predetermined values. (4) Low refractive index layer forming agent composed of a composite oxide of silicon oxide and phosphorous organosilicon compound, for example, tetraethoxysilicate Si
(OC ₂ H ₅ ) ₄ is prepared. After a predetermined amount of ethanol and pure water are added to carry out a hydrolysis reaction, a predetermined amount of an ethanol solution in which a phosphorus compound such as diphosphorus pentoxide or isopropyl acid phosphate is dissolved is added, and an organic solution such as ethanol or ethyl acetate is further added. The solvent is added to adjust the concentration and viscosity of the solution to predetermined values.

Next, a method for forming a multilayer interference film comprising a high color temperature type color temperature conversion filter for further increasing the color temperature on the high color temperature type color temperature conversion film by using each of the above forming agents will be described. I do. First, silicon oxide-cobalt oxide-
Halogen bulb bulb 1 for phosphoric oxide complex oxide forming agent
Immersed, pulled up at a constant speed, and dried, about 500 ~
A heat treatment is performed for several minutes in the air at 700 ° C. to form a first blue colored film layer 81 on the outer surface of the bulb 1. Thereafter, this operation is simply repeated to laminate the blue colored film layer 81 to form the high color temperature type color temperature conversion film 8.

Next, in order to form a multilayer interference film composed of a high color temperature type color temperature conversion filter, the halogen bulb 1 on which the high color temperature type color temperature conversion film 8 was formed in the previous step was removed from titanium oxide or the like. After being immersed in a high-refractive-index layer forming agent, pulled up at a constant speed, and dried, it is subjected to a heat treatment for several minutes in an atmosphere of about 500 to 700 ° C. (N: refractive index, d: physical film thickness) = 150-180n
A first high refractive index layer 91 having a thickness of about m is formed. Next, as the second layer, the high refractive index layer 91 is formed on the high color temperature type color temperature conversion film 8 using the low refractive index layer forming agent.
After immersing the valve 1 formed with it, pulling it up at a constant speed, and drying it, it is heat-treated for several minutes in the air at about 500-700 ° C. to obtain a second film having an optical film thickness nd = about 75-90 nm. A low-refractive-index layer 92 made of silicon oxide or a composite film of silicon oxide and phosphor oxide is formed as a layer. A valve 1 in which a high refractive index layer 91 and a low refractive index layer 92 are alternately laminated on a high color temperature type color temperature conversion film using a high refractive index layer forming agent as a third layer as a final layer. Is immersed, pulled up at a constant speed, dried, and then heat-treated for several minutes in the air at about 500 to 700 ° C. to obtain a third layer made of titanium oxide or the like having a thickness of about 150 to 180 nm. An eye high refractive index layer 91 is formed.
In this manner, the high color temperature type color temperature in which the high refractive index layers 91 and the low refractive index layers 92 are alternately laminated on the high color temperature type color temperature conversion film 8 composed of at least one or more blue colored film layers. A multilayer interference film 9 composed of a conversion filter is formed.

Next, a high color temperature type color temperature conversion film formed as described above and a multilayer interference film composed of a high color temperature type color temperature conversion filter, for example, an automobile using alumina silicate glass as a valve base. Commonly used rating for headlights 12V, 60 /
A halogen lamp according to the present invention provided on the outer surface of the bulb of a 55 W H4 type halogen lamp, a halogen lamp of the same rating provided only on the previously proposed high color temperature type color temperature conversion film on the outer surface of the bulb, and a bulb surface A description will be given of the results of measuring a color temperature and a luminous flux by performing a lighting test of each of the halogen lamps having the same rating and performing clear tests.
The test voltage of each test sample was 13.2 V, the average power of the sub-filament was 68.8 W, and the average power of the main filament was 71.7 W.

First, Table 1 shows the measurement results of the initial characteristics of nine samples of clear H4 type halogen lamps in which nothing is applied to the bulb surface. In Table 1, the SF color temperature is the subfilament color temperature (K), the SF light beam is the subfilament light beam (lm), the MF color temperature is the main filament color temperature (K), and the MF light beam is the main filament light beam (lm). Represents.

[0022]

[Table 1]

Next, Table 2 shows that the outer surfaces of the valves of Samples 1, 2 and 3 shown in Table 1 were coated with 44SiO ₂ -35CoO-21P.
The measurement results of halogen lamps in which only three layers, five layers, and seven layers of the high color temperature type color temperature conversion film having the composition ratio (Wt%) of ₂ O ₅ are applied are shown.

[0024]

[Table 2]

Next, Table 3 shows the sample 4 shown in Table 1.
On each of the bulb outer surfaces of Nos. 9 to 9, a high color temperature type color temperature conversion film having the same composition as that applied to the halogen lamp shown in Table 2 was used.
Layer, 5 layers and 7 layers, and further as a high refractive index layer
Using a TiO ₂ film and a SiO ₂ film as a low refractive index layer, λ / 4
Was subjected to multilayer interference film of the _{TiO 2 -λ / 8SiO 2 -λ /} 4TiO 2 high color temperature type color temperature conversion filter formed by film structure of three layers, showing the measurement results of the halogen lamp according to the present invention .

[0026]

[Table 3]

From the results of the above measurements, it was found that a halogen lamp provided with only a high color temperature type color temperature conversion film exhibiting a blue color by a composite oxide of silicon oxide, cobalt oxide, and phosphorous oxide was applied to the color temperature conversion film. The halogen lamp according to the present invention, on which a multilayer interference film in which a high refractive index layer and a low refractive index layer are alternately further laminated is further provided, further increases the color temperature by providing the multilayer interference film. If the number of layers of the film is the same, it was confirmed that as the number of layers of the high color temperature type color temperature conversion film increases, the color temperature does not become higher. In addition, it has been confirmed that by providing such a multilayer interference film, reflected light having a yellow to red hue is generated in the appearance of the halogen bulb, and an additional advantage that fashionability is improved can be obtained. Was.

The sample halogen lamp used in the above test had a composition ratio of 44SiO ₂ -35CoO-21P ₂ O ₅ (Wt
%), A film using a high color temperature type color temperature conversion film having a high color temperature is disclosed in Japanese Patent Application Nos. 8-168691 and 9-1.
As proposed in US Pat. No. 83205, the composite oxide of silicon oxide, cobalt oxide and phosphorous oxide constituting the high color temperature type color temperature conversion film has a mole fraction of 0.086 ≦ x ≦ 0.804.
, 0.194 ≦ y ≦ 0.623, 0.002 ≦ z ≦ 0.291 (x = Si
O ₂ , y = CoO, z = P ₂ O ₅ ), and x + y + z = 1.
If it is configured to satisfy 000, it can have the same characteristics as those subjected to the above test. Similarly, the sample halogen lamp used in the above test includes a multilayer interference film (a high color temperature type color temperature conversion filter) having a film configuration of λ / 4TiO ₂ -λ / 8SiO ₂ -λ / 4TiO _2.
Showed that using a high refractive index layer is TiO _2, the low refractive index layer is not limited to SiO _2, the high refractive index layer and _{Ta 2 O 5, ZrO 2,} CeO 2, these It is needless to say that an SiO ₂ -P ₂ O ₅ composite film can be used for the low refractive index layer, and the number of layers is not limited to three.

Further, regarding the film configuration of the multilayer interference film having an angle dependency, for example, λ / 4H-λ / 4L-λ / 4H-
λ / 8L (H indicates a high refractive index material such as TiO ₂ , ZrO ₂ , Ta ₂ O ₅ , CeO _2, etc., and L indicates SiO ₂ , SiO ₂ —P ₂ O
₅ Indicates a low refractive index substance such as a composite film), λ / 4H-
.lamda. / 4L-...
Even if a multilayer interference film composed of a / 8L low refractive index layer is used,
Similar effects can be obtained. Further, starting materials for the high color temperature type color temperature conversion film forming agent comprising the composite oxide of silicon oxide-cobalt oxide-phosphorus oxide described in the above embodiment and starting materials for the high refractive index layer forming agent comprising titanium oxide The raw materials and the starting materials for the low refractive index layer forming agent composed of silicon oxide or a composite oxide of silicon oxide and phosphorus oxide are, of course, not limited thereto.

[0030]

As described above with reference to the embodiments, according to the present invention, a high-refractive-color type color temperature conversion film exhibiting blue color formed on the outer surface of a halogen bulb is further refracted. Since the multi-layered interference film is formed by alternately laminating the refractive index layers and the low refractive index layers, high-purity white light with a higher color temperature can be obtained, and reflected light from yellow to red is generated. The additional advantage that the fashionability is improved is obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing a spectral transmittance characteristic of a high color temperature type color temperature conversion film exhibiting a blue color composed of a composite oxide of silicon oxide, cobalt oxide, and phosphor oxide.

FIG. 2 shows a multilayer interference film using titanium oxide for the high refractive index layer and silicon oxide for the low refractive index layer, and zirconium oxide for the high refractive index layer and a composite film of silicon oxide and phosphorous oxide for the low refractive index layer. FIG. 5 is a diagram showing spectral transmittance characteristics of a multilayer interference film that has been used.

FIG. 3 shows a film configuration used for a halogen lamp according to the present invention in which a multilayer interference film made of titanium oxide and silicon oxide shown in FIG. 2 is formed on a high color temperature type color temperature conversion film exhibiting blue shown in FIG. It is a figure showing a spectral transmittance characteristic.

FIG. 4 is a cross-sectional view showing an embodiment of the halogen lamp according to the present invention.

5 is an enlarged schematic cross-sectional view showing a laminated portion of a high color temperature type color temperature conversion film and a multilayer interference film in the embodiment shown in FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Glass bulb 2a Subfilament 2b Main filament 3,5,6 Lead wire 4 Reflector 7 Bridge glass 8 High color temperature type color temperature conversion film 81 Blue coloring film layer 9 Multilayer interference film 91 High refractive index layer 92 Low refractive index layer 10 Base 11 Light shielding film

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[Procedure amendment]

[Submission date] February 2, 1998

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction contents]

As the multilayer interference film, for example, titanium oxide is used for the high refractive index layer and silicon oxide is used for the low refractive index layer, and λ / 4TiO ₂ -λ / 8SiO ₂ -λ / 4TiO _{2 is} alternately used.
In the case of a three-layer film laminated with the above film configuration, a spectral transmittance characteristic as shown by a curve A in FIG. 2 is exhibited. Similarly, zirconium oxide is used for the high refractive index layer, and a composite film of silicon oxide and phosphorous oxide is used for the low refractive index layer, and λ / 4 ZrO ₂ −
λ / 4SiO ₂ · P ₂ O _5- ········ 11
Layers repeatedly, and the final layer is λ / 8SiO ₂ .P
FIG. 2 shows a multilayer interference film in which ₂ O ₅ is laminated to form a 12-layer film structure.
Shows a spectral transmittance characteristic as indicated by a curve B. Note that λ
Is the center wavelength of the reflection region in the desired spectral transmittance characteristics, and these spectral transmittance characteristics change depending on the type of the substrate, the type of the oxide, the film thickness, the film configuration, and the like.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0027

[Correction method] Change

[Correction contents]

From the results of the above measurements, it was found that a halogen lamp provided with only a high color temperature type color temperature conversion film exhibiting a blue color by a composite oxide of silicon oxide, cobalt oxide, and phosphorous oxide was applied to the color temperature conversion film. The halogen lamp according to the present invention, on which a multilayer interference film in which a high refractive index layer and a low refractive index layer are alternately further laminated is further provided, further increases the color temperature by providing the multilayer interference film. if the number of layers of film are the same, the more the number of layers of high color temperature type color conversion layer is large, that the color temperature increases was confirmed. In addition, it has been confirmed that by providing such a multilayer interference film, reflected light having a yellow to red hue is generated in the appearance of the halogen bulb, and an additional advantage that fashionability is improved can be obtained. Was.

Claims (2)

[Claims] 1. A high color temperature exhibiting a blue color composed of at least one layer of a composite oxide of silicon oxide, cobalt oxide and phosphorous oxide on the outer surface of a halogen lamp bulb made of a heat-resistant translucent substrate having a filament inside. A multi-layer interference film formed by alternately stacking high-refractive-index layers and low-refractive-index layers on the high-color-temperature-type color temperature converting film; light bulb. 2. The halogen lamp according to claim 1, wherein the multilayer interference film is a high color temperature type color temperature conversion filter having a color mainly including blue.