JPS5865403A - Optical coating suitable for high temperature application - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates generally to optical coatings, and more particularly to optical coatings used at high temperatures. More particularly, the present invention relates to high temperature, energy saving lamps covered with optical coatings to improve energy efficiency.

Interference filter type optical coating thin films that use two materials with different refractive indexes cannot generally be used in high-temperature environments where the coating film is exposed to air at temperatures over 500°C for long periods of time. . Normally, optically coated thin films cannot withstand the above-mentioned usage environment, and this inability to use is due to one of the reasons described below. Namely, the adhesion of the optical coating film to its support decreases, the materials of the high refractive index layer and the low refractive index layer forming the coating film interdiffuse, and the ratio of the refractive index of one material decreases. the material of the thin film layer evaporates, and the absorption by the coating film increases unacceptably.

One of the applications of optical coatings (thin films) is to improve the lighting efficiency of incandescent lamps. It is well known that applying a thermally reflective optical coating to the bulb of an incandescent light bulb increases the energy efficiency of the light bulb. The thermal reflector reflects the infrared energy emitted by the filament of the light bulb back into the filament, while transmitting a small portion of the electromagnetic radiation emitted by the filament. This reduces the amount of electrical energy that must be supplied to maintain the filament's operating temperature. For example, US Patent No. 3.9'192! ;No. 9, '1,0/'17! ;G No., No. % / A O, 9,2
No. 9 and No. 11.22'l//3 disclose the use of various types of heat reflectors in the whole or part of the bulb section of an incandescent lamp. However, 5
None of these cited patents disclose the application of forming an optical coating on the surface of a lamp bulb portion that operates in air at temperatures generally exceeding 0.000°C.

U.S. Patent No. 11,0/z7! No. 1 has a heavily doped metal oxide filter formed closest to the filament body of the rung and is placed in contact with this heavily doped metal oxide; The use of a thermal reflector with an optical coating consisting of a composite filter with a multilayer interference filter placed on the outer surface of the bulb section is taught. For example, this US Patent No. 9θ/'17! No. ig suggests that both filters can be placed on the inside wall of the bulb portion of the lamp, both filters can be placed on the outside wall, or that one filter can be placed on the inside wall and the other on the outside wall.

This U.S. patent also discloses a particular embodiment using a double-walled lamp bulb section in which an interference filter and a doped metal oxide filter are combined on the wall of the lamp bulb section. It suggests various ways of arranging them. Although this U.S. patent makes specific reference to the use of the composite filter disclosed in the patent in halogen lamps, it does not exemplify an interference filter that can withstand the operating temperatures of the surface of the bulb portion of the halogen lamp. Not yet. The only high refractive index materials mentioned in this US patent are zinc selenide, zinc sulfide and titanium dioxide. That is, this US patent refers to the use of silicon dioxide as a low refractive index layer in a thin coating of an interference filter;
Furthermore, it is a well-known fact that silicon dioxide can withstand high tAFJffli, but the high refractive index material mentioned in the patent cannot withstand a high temperature environment exceeding gθo0 on the outer surface of the bulb portion of a halogen lamp. Can not.

Therefore, an object of the present invention is to provide an optical coating film consisting of a material layer with a low refractive index and a material layer with a high refractive index, the film comprising:
The purpose of the present invention is to provide a thin film that can withstand high temperature environments exceeding 00°C.

The main object of the present invention is to provide a multilayer optical interference filter that can withstand high temperature environments.

Another object of the present invention is to provide an optical coating that is a heat reflecting mirror that can be used in high temperature environments.

A further object of the present invention is to provide a halogen cycle lamp bulb section having an optical interference filter formed on its outer surface that withstands the operating temperatures thereof.

A further object of the invention is to provide a halogen lamp having an energy-saving optical interference filter formed on the outer surface of the lamp bulb portion. and a first set of layers consisting primarily of tantalum pentoxide, the discovery that the optical coating can withstand high temperature environments even when the optical coatings are operated in high temperature environments in air for significant periods of time. It is based.

Combinations of silicon dioxide as a low refractive index material and other refractory high refractive index materials such as titanium dioxide cannot withstand similar high temperature operating environments.

It has also been found that the optical coating of the present invention can withstand high flow embedding on the outer surface of a halo tube lamp bulb section having a small radius of curvature, since the stress in the coating due to thermal imbalance is This is due to the fact that it is emphasized by being small.

Therefore, the term "-" in the special pregnancy of the present invention is generally so.

A coated article that is effective in high temperature environments exceeding 30°F (°C) is characterized by a generally transparent support made of a material that can withstand high temperature environments and a coating formed on one surface of the support. and an optical coating comprising at least a first silk layer consisting primarily of silicon dioxide and a first set of layers consisting primarily of tantalum pentoxide. An interference filter formed of a first set and a first set of alternating layers is included.

The interference filter includes a bandpass filter designed to transmit radiation contained in a band having a preselected wavelength and reflect radiation contained in an adjacent wavelength range. A specific example of such a bandpass filter is a thermal reflector that has a high reflectance for visible light and a high reflectance for infrared light. As another example,
The bandpass filter may be a color filter having high transmittance for a preselected portion of the visible light spectrum and high reflectance for adjacent spectral regions. The optically coated support is a fused silica lamp bulb suitable for use in a haloke recirculating recirculating incandescent lamp operating at a temperature of the outer surface of the lamp bulb of at least about g o 'c. and includes a lamp bulb portion having an interference filter formed on an outer surface thereof.

Another feature of the invention provides an article useful in high temperature environments, generally above 500° C., which article includes a generally transparent support formed of a material capable of withstanding high temperature environments; It includes a multilayer interference filter formed on one surface and having high reflectivity for infrared radiation and high scattering properties for visible light. The interference filter consists of depositing a multilayer dielectric stack consisting of alternating layers each consisting primarily of at least silicon dioxide and tantalum pentoxide on the support, and then exposing the support with the stack applied to the support in air. Formed by baking at a temperature of at least 7100°C.

According to another feature of the invention, an energy efficient Sareta Halogan lamp is provided. Conohalophone lamps include a lamp bulb portion formed of a generally transparent material having an arrangement such that the focal point, focal line, or focal plane is plumbed therein and capable of withstanding an operating temperature of at least about 00° C. or less. . A filament of high melting point volume is disposed within the lamp bulb section and generally on the focal point, focal line or focal plane, and a halogen gas is provided to fill the bulb section. An interference filter is formed on the outer surface of the lamp bulb section and is comprised of alternating layers each consisting primarily of at least silicon dioxide and tantalum pentoxide. The interference filter formed on the halogen lamp may be a bandpass filter having high transmittance for initial light and high reflectance for red and external radiation. Alternatively, the interference filter has a high transmittance for radiation contained in a preselected portion of the visible light spectrum and a high reflectance for radiation contained in an adjacent wavelength range, and that It may also include a band-pass filter such that the result is a lamp with a light output of a preselected color.

Interference filters formed in halogen lamps are also multilayer stacks of dielectric materials, each consisting primarily of layers of silicon dioxide and tantalum pentoxide, with high transmittance for visible light and high reflectance for infrared light. The multilayer laminate is deposited on the outer surface of the lamp bulb section, and the bulb section to which the filter is attached is then exposed to at least approximately The filter may include a filter that scatters visible light and reflects infrared rays, which is formed by baking at a temperature of /10θ°C.

The halogen lamp according to the invention can also use a multilayer interference filter cast on a support which is used as an end reflector in the lamp bulb section.

The present invention improves energy efficiency by allowing the formation of an optically coherent coating directly on the outer surface of the halodane bulb section, which normally operates at temperatures of about 0.degree. C. For the first time, it became possible to do this in an appropriate way for lamps. Performance improvements in the range of about 2S% to 30% have been measured for /S00 watt halogen recirculation lamps incorporating the present invention. This degree of improvement would not have been possible in practice if an infrared reflective coating had been placed around the outer surface of the lamp bulb, and on a surface remote from this outer surface, in order to lower the operating temperature of the coating. Must.

The ozotic coating of the present invention can be used in various high-temperature environments such as heat-reflecting windows used in furnaces, laser pumping holes, and discharge lamps of the Artara/G type used in theater projection equipment. could also be effectively applied.

In general, the present invention relates to the fabrication of ozotic coatings that can be used in any high temperature environment where the performance of the optical interference filter-type ozotic coating results in improvements in the operating efficiency or other operational conditions of the coated equipment. Applicable to

Other objects, features, and advantages of the present invention will become apparent from the following detailed description, taken in conjunction with the accompanying drawings.

With reference to FIG. 1, the application of the principle of the present invention to the No. Rodan regenerative circulation type tungsten run f10 will be described. However, it should be understood that the principles of the present invention are applicable to any high temperature environment in which ozotic coatings have been found useful. Halodan recirculating lamp 10 includes a lamp bulb section 11 that includes a fused silica tube 12 and/or a pair of end sealing and connecting structures 13 . Along the central axis of the fused silica tube 12, a plurality of coiled tungsten filaments 15 are attached to the supporting structural member 1.
Supported by 6. End reflectors 17 can be provided at both ends of the tungsten filament 15. In the manufacturing process, the Haloke 9 cycle lamp has sealed end section 1.
3 by sealing the quartz tube 12, then draining the tube 12, and finally refilling the tube with a suitable reactive halogen free side.

During operation of the halogen lamp 10, the halodane gas reacts with the tungsten evaporating from the filament. The reactant gas is decomposed by a chemical reaction on the hot surface of the tungsten filament, so the tungsten atoms in the gas are deposited on the filament, while the halogens are liberated to capture additional released tungsten atoms. In order for a halogen recirculating lamp to operate properly, the quartz tube 12 must remain hot near θO0, which is generally accomplished by keeping the diameter of the quartz tube 12 relatively small. For example, a typical lamp has a length of about 70 inches (-!ilIcIrL) and a diameter of about % inches (qJsl+1).

In accordance with the present invention, an optical coating film 14 is deposited on the outer surface of the quartz tube 12. The optical coating is comprised of at least a first set of layers consisting primarily of silicon dioxide and a second set of layers consisting primarily of at least tantalum pentoxide. The design of optical coating 14 can take one of a number of forms depending on the spectral properties desired for the coating. Generally, optical coating 14 consists of a stack of seven or more dielectric layers, such as alternating layers of silicon dioxide and tantalum pentoxide to form an interference filter.

For convenience, one layer of an optical filter is called a silicon dioxide layer or a tantalum pentoxide layer, but the silicon dioxide layer is not made only of silicon dioxide, and similarly, the tantalum pentoxide layer is not made only of tantalum pentoxide. It should be kept in mind. In both layers, some components of other dielectric films are present.

For example, tantalum pentoxide may also contain small percentages of refractory "oxides" such as titanium dioxide.

It should also be noted that the ozotic filter 14 can take one of several forms, each of which embodies the general principles described below. The general principle is that an ozotic filter in one of these forms is a selectively reflective coating, i.e. such a film is
0 is largely transparent to radiation in those regions of the spectrum where it is desirable to emit radiation, but in the remainder of the spectrum where the emission of electromagnetic radiation is substantially carried out by hot filaments. This means that the emitted radiation is generally reflected over the area.

One of the selectable forms that optical coating 14 can take is a second coating design 14A.
As depicted in the figure, the design noclameter is listed in the attached Table 1. The overall properties of this coating are depicted in Figure.

As the dashed curve 22 shows, the coating 14A has a high transmittance in the visible range of the electromagnetic radiation spectrum from I 00 nm to g 00 nm and is highly transparent over the remainder of the spectrum, especially from the hot filament of the lamp. In the near-infrared region, where there is a considerable amount of electromagnetic radiation emitted, the reflectance is high, as shown by curve 21 in FIG.

FIG. 3 shows the radiant energy emitted from a Kelvin blackbody at a blackbody temperature of 3,0θQ OK . According to FIG. 3, only a small percentage of the total radiation emitted by the filament of a Halodan recirculating lamp is between '100 n and 700 n.
It can be seen that it does not exist in the visible light region spanning m. Most of the emitted radiation is in the infrared region of the spectrum, located on the longer wavelength side of the visible region. Unless the lamp is used for both heating and illumination purposes, the emission of infrared radiation from the lamp wastes energy and, in some applications, results in undesirable heating of the surrounding environment. For example, in the case of theater or stage lighting where intense illumination is required, the heating effect of high-intensity lamps is unwelcome because it overheats the illuminated area. By providing the lamp 10 with an optical coating 14 that reflects the dead red rays, the part of the emitted radiation in the infrared region is reflected back to the filament 15, where it serves the useful role of maintaining the heating of the filament. In addition, a major portion of the visible light emitted by the filament passes through the lamp and performs the useful function of illuminating the surrounding environment.

With reference to FIG. 2 and Table 1, the overall filter characteristics depicted in FIG.
You can see that it can be obtained by doing. 1st
As shown in the table, the layers labeled 21-27 are (L
/2 HL/2 )3 Form a first dielectric stack l having the general design formula for a dielectric stack expressed as HL/2 )3 , where is this stack I? A short wavelength transmission interference filter having a design wavelength of o onm is constructed. The spectral reflectance of this short wavelength transmission multilayer filter is depicted in FIG.

This dielectric laminated filter is considered to be a short wavelength transmission type laminated filter, but is that what it is? QQnm
This is due to the fact that it has a very low reflectivity at wavelengths shorter than the design wavelength of , and has areas of considerably higher reflectance at wavelengths longer than 9000 m 2 . The second dielectric stack ■ is ios.

2:/dielectric stack having a design wavelength of nm,
We have a general design formula for the dielectric stack expressed as (LHL)4. The spectral reflectance of this 2:/layer is depicted as curve 24 in FIG.

The third dielectric stack ■ used in coating 14A is a short wavelength transmission filter with a design wavelength of / / 00 nm, and the general design formula for the dielectric stack is expressed as (L/2HL/2)5. has. Dielectric laminate I
, II, and l, rLJ refers to a layer of low index material (ie, silicon dioxide in this case) that has an optical thickness of 174 wavelengths at the design wavelength. Similarly, the label rHJ is 174 at the design wavelength.
Refers to a layer of high refractive index material (i.e., in this case tantalum bilayer) that has an optical thickness of a wavelength. The design formula is (L/
2HL, /2) 3, it can be seen that the V2 layers in the formula are all layers with an optical thickness equal to 178 wavelengths at the design wavelength. In this embodiment of the physical filter, the first and last layers of the stack l, i.e. layers 21 and 27 of Table 1,
is a net 178 wavelength layer of silicon dioxide, a low refractive index material. In contrast, layers 23 and 25 are 174-wavelength layers because they are formed at the same time.
This is due to the fact that it consists of two 178 wavelength layers. The same analysis is (L
This also applies to the short-wavelength transmission type stacked structure (2) that uses S components of the design formula of /2 HL/2). layer 1 and layer 1
1 is a 1/8 wavelength layer, whereas layers 3, 5, 7, and 9 physically become 174 wavelength layers, which are two 174 wavelength layers.
It is the sum of 8 wavelength layers. Moreover, when actually constructing the filter, layers 11, 11', and 12 are physically seven layers, and layers 20, 20', and 21 are 'physical layers of silicon dioxide, which is a low refractive index material. It becomes a single layer. The names of the layers on the right side of FIG. 2 should be interpreted as follows. That is, as mentioned earlier, H and L refer to high refractive index material and low refractive index material, respectively, whereas the subscripts A, B, and C below refer to three different design wavelengths. where A is the design wavelength of 900 nm and B is / 0! ; O
C indicates the design wavelength of / / 00 nm.

There are also other types of optical coatings that are useful for use in the Helogne cycle lamp 10 depicted in FIG.

For example, an optical coating 18 can be formed on the end face reflector 17 of the rung. In this case, the optical coating 18 can be designed to reflect all the components of the radiation emitted by the filament 15, since this optical coating is emitted in the cavity of the bulb part 12 in the direction of the end reflector. The bulb of the lamp tends to maintain its energy.
2, this optical coating 18 performs the useful job of heating the filament and, if not, maintaining the internal temperature of the lamp.

There are also applications where other designs of optical filter 14 are desirable. For example, in some applications,
Colored light output from the rungs may be desired. One method for obtaining colored light output is to convert the visible light emitted by the lamp into P-light through an absorptive color filter that transmits only the desired components of the visible light spectrum. However, such absorption filters waste the energy emitted by the lamp and dissipate this energy within the filter itself. According to the invention, optical coating 14 can be designed to have a transmission band that includes only selected portions of the visible spectrum;
Instead, only that part of the radiation emitted by the lamp leaves the lamp; all the radiation of adjacent wavelengths, including the visible and infrared parts, is reflected back into the lamp and reaches the filament, so that the lamp as a whole Energy efficiency will increase. The design of narrowband transmission filters with high transmission only in that part of the visible light spectrum corresponding to the desired color emitted by the lamp is well known to those skilled in the art, and includes, for example, etch, knee, v-ray, etc. L/Mr. Ord (HA-MacLeod) 1” Th1n F
ilm Optical Filters J, American Elsevi
er PublishingCmp'any, New
Please refer to the general teachings contained in Chapter 7 of York (/9/2012). Kagaru filter is still 7
MI, published by the US Department of Defense in October 1962.
It can also be designed according to the concepts described in Chapter 20 of LH8';/1ltt. No. 20
The chapter is Application of Thin Film
Coatings (Application of thin film coating)''
The author is Ph1lip Baumeisfe.
r (Mr. Philippe Baomeister). The references cited above are incorporated herein by reference as teaching the design and design concepts of all-dielectric optical filters employing the principles of the present invention. In other words, it should be noted that the invention is applicable to all types of optical filters, especially band-pass and edge-type optical filters.

Generally, the optical coating 14 shown in FIG. 1 is formed on a Lang tube section 110 placed in a vacuum deposition chamber using standard vacuum deposition techniques. For example 1. Optical coating of small diameter lamp bulbs is carried out in a standard planetary gear type vacuum deposition chamber, with the entire outer surface of the quartz lamp bulb uniformly exposed to the deposition source within the chamber. This is accomplished by adding a rotational degree of freedom in which each quartz lamp tube section itself rotates about its central axis to the degree of freedom in which each lamp tube section rotates around the deposition source. Generally, both the silicon dioxide layer and the tantalum pentoxide layer of the coating film are
In gas reaction mode, at least about 27! ; the coating film is deposited on the surface of the support maintained at a temperature of C; Either electron beam evaporation sources or resistance heated evaporation sources are used. Gas reaction deposition involves the process of flowing oxygen gas into the deposition chamber during the deposition process.In order to improve the yield of the optical 7 coating applied to the surface of the lamp tube section with a small radius of curvature, the deposition source is The approach angle of the vapor deposition material to the support is approximately 35
It has been found that it is preferable to do this so that the value does not exceed 0.

Optical coatings using the principles and materials of the present invention have been fabricated and tested at temperatures up to 110°C. At temperatures below /10θC, the optical performance of the filter remained largely constant, with no signs of coating failure, increased coating absorption, or interdiffusion between the layers that make up the coating. . We have found that baking the coating at /10 OC for an extended period of time in air transforms the coating from a filter that transmits visible light and reflects infrared light to a filter that largely scatters visible light and reflects infrared light. The spectral characteristics of the filter are depicted in FIG. When an optical coating is exposed to temperatures of this temperature in air for a significant period of time, the coating cracks and appears as a continuous reflective film that reflects well in the visible part of the spectrum but reflects radiation in the infrared region. It is subdivided into many small islands. The optical properties shown in FIG. 3 are for an optical coating according to the design described in the table above. Other designs of coatings are possible that optimize scattering in the visible range, yet otherwise modify the spectral transmittance, spectral reflectance, and scattering response characteristics of the filter.

An actual halogen regeneration recirculating lamp employing the optical coating design depicted in Figure 2 and listed in the attached table was constructed and tested to improve the energy efficiency of optically coated lamps. I confirmed that it was.

/! f;00 watt lamp tested, 2S% to 3
Performance improvements in the range of 0% were demonstrated. This demonstrated performance improvement correlates well with the calculated percentage theoretical improvement value, which is within the range of 30% to 33%.

As previously pointed out, the principles of the present invention are also applicable to environments using other types of lamps, such as arc discharge lamps, where an excited plasma emits light of various wavelengths. Due to the presence of a large number of free electrons in plasma,
Plasma is both a good radiator and a good absorber. Therefore, the concept of reflecting undesirable components of light emitted from the plasma back into the plasma should similarly improve the energy efficiency of arc discharge lamps. The principles of the invention are applicable to laser pumping lamps that use a plurality of flash lamps or continuously lit incandescent lamps surrounding a ruby rod placed in a cavity for optical pumping. Since the ruby laser rod only transmits light in a certain part of the spectrum, the lamp's energy efficiency can be improved by applying an optical coating to the surface of the optical pumping lamp that allows only useful light to pass through the laser rod. It is possible to achieve this. Unwanted light is reflected back to the pumping lamp to improve lamp efficiency.

Although the principles of the invention have been described in terms of several selective embodiments, it will be appreciated that various other applications of the invention will be apparent to those of ordinary skill in the art. . Accordingly, the present invention is not limited to the specifically exemplified applications described above, but includes applications in high temperature coating environments where optical coatings can be used to improve certain features of the properties of the coated device. The present invention is applicable to any environment.

Air 1000 / lg sg bar g ss.

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;g 77/'I ll30 support III O 2 QWOT (i.e., the reference wavelength at which the layer has an optical thickness of 174 wavelengths)

[Brief explanation of the drawing]

FIG. 1 is an elevational view, partially in section, of an optically coated halogen lamp according to the present invention. FIG. 2 is a partial elevational view of a thermally reflective mirror coating designed employing the principles of the present invention. FIG. 3 shows the emission vector of blackbody radiation. FIG. 9 shows the visible light transmission and infrared reflection properties of an exemplary optical coating according to the present invention. 6 is a graph of the spectral reflection properties of a short wavelength transparent dielectric stack that is the groove component of the all-optical coating shown in FIG. 6. FIG. Figure 7 is a graph of the spectral reflection properties of another short wavelength transparent dielectric stack used as a component of the optical coating depicted in Figure 2; FIG. Regeneration circulation type lamp 11 =...
Tubular portion 12...Fused quartz, container of the same cylinder, support body 14...
・, Optical coating 15 ・・・ Filament 17 ・・ 1 Reflector 18 ・・ Multilayer interference filter FIG, -6 - FIG, -8 Commissioner of the Japan Patent Office 1, Indication of the case 1932 patent application Column 1 6o7 No. 2, Title of the invention: Onochikaru coatige suitable for use at high temperatures 3, Relationship with the case of the person making the amendment: Applicant 4, Attorney 5, Date of amendment order: October 26, 1960 6, Subject of amendment Application form Power of attorney All drawings - Invitation

Claims (1)

[Claims] / An article coated with a coating that is effective in high temperature environments exceeding approximately 500°C, comprising: a generally transparent support formed of a material that can withstand high temperature environments; and one of the supports. an optical coating formed on the surface and comprising at least a first set of layers consisting primarily of silicon dioxide and a first set of layers consisting primarily of at least tantalum pentoxide. Articles that have been treated with The coated article of claim 1, wherein the optical coating includes an interference filter formed of alternating layers of the first and first sets. 3. The interference filter is a band-pass filter designed to transmit radiation contained in a band having a preselected first wavelength and reflect radiation contained in an adjacent wavelength range. An article coated with a coating according to claim 2. The coated article according to claim 3, wherein the bandpass filter is a heat reflecting mirror having high transmittance for visible light and high reflectance for infrared rays. 4. The coated article of claim 3, wherein said bandpass filter is a cold reflective casting having high reflectance for visible light and high transmittance for infrared light. B. The band transmission filter is a color filter that has high transmittance for a preselected part of the visible light spectrum and high reflectance for an adjacent spectrum area. An article coated with a coating according to scope 3. 7. The supports and carriers are molded to a temperature of at least about goθ°C.
The interference filter includes fused silica in the tube section suitable for use in a halo-cycle incandescent lamp operating at the temperature of the outer surface of the lamp bulb section. An article having a coating as set forth in any one of claims 7 to 6 formed on its outer surface. An article that is coated with a coating that is effective in a high-temperature environment of approximately 500°C or more, comprising a generally transparent support made of a material that can withstand the high-temperature environment, and a coating formed on one surface of the support. a multilayer interference filter having high reflectance for infrared radiation and high scattering properties for visible light; A coating characterized in that it is formed by depositing a dielectric stack on said support and then baking said support with the stack applied in air at a temperature of at least 7100°C. 9. A lamp bulb portion formed of a generally transparent material having an arrangement such that a focal point, focal line or plane is located therein and capable of withstanding an operating temperature of at least about 00° C.; within the tube portion and generally at the focal point,
A filament made of a high-melting point metal disposed on the focal line or focal plane, a halogen gas filled in the aforementioned Lang tube portion, and at least silicon dioxide formed on the outer surface of the Lang tube portion. 1. A halogen lamp characterized in that it includes an interference filter constructed of alternating layers, each consisting essentially of tantalum pentoxide. 10. The interference filter is a band-transmissive lamp having a high transmittance for visible light and a high reflectance for infrared radiation. 10. The halogen lamp according to claim 9, which is a type filter. // The interference filter has a high transmittance for radiation contained in a preselected portion of the visible light spectrum;
Claim 9, wherein the filter is a band-transmissive filter that has an infrared reflectance for radiation contained in adjacent wavelength ranges, so that the light output of the lamp is of a preselected color. halogen lamp. Is it possible that the interference filter is a seven-layer multilayer stack, each consisting mainly of a prelayer of silicon dioxide and tantalum pentoxide? A multilayer stack of dielectrics having a high transmittance for F-rays and a high reflectance for infrared radiation is deposited on the outer surface of the lamp bulb section, and then the filter is applied to substantially transmit visible light from a visible light transmitting filter. A filter that reflects infrared rays and scatters visible rays formed by baking the tube portion to which the filter is attached in air at a temperature of at least about 100° C. to transform it into a scattering filter. range (as described in item 9)・Roden lamp. /3. The Lang tube portion includes a generally cylindrical vessel, and reflectors are disposed at opposite ends of the vessel, the reflectors made of a generally transparent material forming a multilayer interference filter on its surface. The multilayer interference filter is composed of alternating layers of at least silicon dioxide and tantalum pentoxide, each of which is mainly composed of silicon dioxide and tantalum pentoxide, and has a high reflectivity for the total radiation emitted from said filament. A halogen lamp mounted on any of Item 9, Item 1θ, Item 1/or Item 7.2.