JP2001243924A - Bulb tube and bulb tube with reflection mirror - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bulb tube such as a tungsten halogen lamp which has little variation in film thickness and superb luminous characteristics with inconspicuous white turbidity even if the multi-layer light-interfering film is formed on the surface of glass bulb by plating method. SOLUTION: The bulb tube and the bulb with a reflection mirror are provided with a glass bulb 1 with continuous curved surface parts, a light source 4 arranged inside the bulb 1, and a multi-layer light-interfering film 5 with vapor phase epitaxy formed on the surface of the bulb to a direction within an angle θof not more than 30 deg. against the vertical line from the surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulb such as a halogen bulb having a multilayer light interference film such as a visible light transmitting infrared reflection film formed on a surface of a glass bulb.

[0002]

2. Description of the Related Art Various efforts have been made in the field of bulbs as part of energy saving. For example, in a halogen bulb, a visible light transmitting infrared reflecting film is formed on the surface of a glass bulb to radiate light from a filament. It is known that visible light is transmitted through a bulb, and infrared light is reflected by the reflection film and returned to the filament, thereby heating the filament and increasing luminous efficiency.

[0003] As such a visible light transmitting infrared reflecting film, a high refractive index layer film made of titanium oxide TiO ₂ or the like and a low refractive index layer film made of silicon oxide SiO ₂ or the like are alternately laminated to form a multilayer. By appropriately selecting the number of layers and the thickness of the layers, light in a desired wavelength range is selectively transmitted and reflected by utilizing light interference. In general, in this light bulb, the greater the number of layers of the film, the higher the reflectivity of infrared rays and the greater the effect of power saving.

However, the multilayer optical interference film formed on the surface of the bulb only needs to have a predetermined uniform film thickness over the entire surface. A desired luminous efficiency cannot be obtained without reflection.

[0005] The outer shape of the glass bulb of the tube is spherical, elliptical, elliptical, conical, cylindrical, or a combination thereof, and has a continuous curved surface. There is a problem that it is difficult to form a uniform film thickness when forming the film.

As a method of forming the multilayer optical interference film, there are an immersion method, a PVD method (physical vapor deposition method), a CVD method (chemical vapor deposition method), and the like. The forming method has advantages and disadvantages.

The above-mentioned immersion method is a method in which a valve is immersed in a film-forming solution, pulled up and fired to obtain a film. The method is simple and cost-effective, and is often used. When the valve is not straight, but has a curved surface or an uneven surface, the thickness of the formed film may be uneven.

In the case of the PVD method, since the film forming material is usually supplied from one place and does not fly from all directions around the valve, a supply source of the film forming material is arranged below the valve and the central axis of the valve is arranged. Even if the valve is rotated horizontally or inclined, it is difficult to form a film with a uniform thickness, for example, a thin portion is formed on the sealing portion at the top or end of the valve or on the irregular curved surface near the exhaust pipe. there were.

In the case of the CVD method, a film of a desired material is deposited on the surface of the valve by using a specific gas.
Problems such as complicated and time-consuming control and control of the processing temperature, and the use of a gas with a high deposition temperature requires careful attention to safety, requiring high costs for auxiliary equipment for processing. There is.

Further, the PVD method includes an ion plating method, a vapor deposition method, and a sputtering method. These methods have no restrictions as in the above-described CVD method, and have a feature that the processing speed is high. It has been difficult to form a film having a uniform thickness on a valve having a continuous curved surface.

[0011] The difference between the PVD method and the CVD method is that the PVD method has a directional growth of a deposited film, whereas the CVD method has a moving direction of molecules constituting a gas in all directions. Correspondingly, there is no tendency in the growth direction of the film, and a uniform film can be formed. For this reason, in the CVD method, when foreign matter is present on the surface of the valve, a uniform film is formed so as to surround the foreign matter.

On the other hand, the surface of the glass bulb on which the coating is formed looks smooth at first glance, but in the process of sealing the end of the bulb and sealing the exhaust pipe, the bulb is heated and softened with a burner to perform the work. Therefore, silica (silicon oxide Si) having a composition such as quartz glass when heated is used.
O ₂₎ powder may be scattered, this is sometimes fine irregularities of about 0.1nm~5.0nm adhering to the surface of the valve is formed.

When the material for forming the multilayer optical interference film is coated on such a fine uneven surface, the uneven surface of the coated base material appears as it is as the uneven surface of the multilayer optical interference film, and the interference function is reduced to a predetermined wavelength. There is a problem that transmission and reflection of light cannot be performed.

In particular, when the multilayer optical interference film is formed by a PVD method such as an evaporation method or an ion plating method or a CVD method as compared with the case where the multilayer optical interference film is formed by an immersion method, the film thickness should be made extremely thin. Therefore, the unevenness of the valve surface has a great effect. That is, when a multilayer optical interference film is formed on an uneven surface, in the worst case, there is a disadvantage that the film becomes cloudy and the transmittance is significantly reduced.

[0015]

Therefore, the present inventors reviewed the method of forming an existing multilayer optical interference film, conducted various investigations to eliminate the disadvantages, and studied the method of forming the film even by the ion plating method. It has been found that the variation in the film thickness can be reduced and the cloudiness of the film can be reduced.

According to the present invention, there is provided a halogen light bulb or the like which can improve the light emission characteristics in which the variation in film thickness is small and white turbidity is not conspicuous even when a multilayer optical interference film is formed on the surface of a glass bulb by an ion plating method. The purpose is to provide a bulb.

[0017]

According to a first aspect of the present invention, there is provided a bulb including a glass bulb having a continuous curved portion;
A light source disposed in the bulb; and a multilayer optical interference film having a vapor phase growth direction formed on the surface of the bulb at an angle of 30 degrees or less with respect to a perpendicular line from the surface. .

By performing the film formation in a direction in which the vapor phase growth direction is within 30 degrees with respect to the perpendicular of the bulb, the atoms and molecules of the film forming material coming in are densely incident and laminated.
It has the effect of preventing turbidity and voids.

The multilayer interference film formed on the surface of the valve may be the outer surface, the inner surface, or both the inner and outer surfaces of the valve. Also, by appropriately selecting the number of high refractive index layers and low refractive index layers constituting the multilayer optical interference film, the material, the thickness of the film (layer), etc., the visible light transmitting infrared reflecting film or the visible light reflecting infrared transmitting film can be obtained. Can be easily obtained.

In the present invention and the following invention,
Unless otherwise specified, definitions and technical meanings of terms are as follows.

The bulb includes a bulb such as a halogen bulb, a bulb not containing halogen, or a high-pressure discharge lamp such as a metal halide lamp and a mercury lamp, and can be applied to these bulbs. Further, the light source means a coiled filament that emits light in the case of a light bulb, and a discharge electrode in the case of a discharge lamp.

According to a second aspect of the present invention, the multi-layer optical interference film on the surface of the glass bulb has a small angle of formation in the vapor phase growth direction toward the end with respect to the center of the bulb. Features.

Since the top of the valve end, the sealing portion and the exhaust pipe are heat-processed, fine powder of silica SiO ₂ adheres to them in the vicinity thereof, and the unevenness is large. If the angle is reduced, more precise lamination can be performed.

According to a third aspect of the present invention, in the tube bulb, the outer shape of the glass bulb is at least one kind of curved surface portion selected from a spherical shape, an elliptical shape, an oval shape, a conical shape, and a cylindrical shape. It is characterized by having a shape having.

It is possible to form a coating film corresponding to various curved surface shapes, and the same operation as that of the first aspect is achieved.

A tube according to a fourth aspect of the present invention is characterized in that a multilayer optical interference film is formed on the surface of a glass bulb by an ion plating method.

The requirement described in claim 1 can be satisfied by the ion plating method, and the same operation as in claim 1 can be achieved.

The tube according to the fifth aspect of the present invention is characterized in that the unevenness on the outermost surface of the multilayer optical interference film formed on the surface of the glass bulb is not more than 20% of the outermost film thickness. And

The effect of preventing scattering of visible light and infrared light is exerted by reducing unevenness difference on the outermost layer surface of the multilayer optical interference film and improving smoothness.

That is, if the difference in unevenness exceeds 20%, the difference in unevenness on the surface is large, so that white turbidity is liable to occur, and a predetermined wavelength is not transmitted or reflected, that is, a problem that scattering of visible light or infrared light occurs. is there.

The bulb according to claim 6 of the present invention has a multilayer optical interference film formed on the bulb of the bulb according to any one of claims 1 to 5 having a transmittance of 100% at a wavelength of 550 to 650 nm. On the other hand, the transmittance at a wavelength of 550 to 650 nm after the multilayer optical interference film formed on the bulb of the tube according to any one of claims 1 to 5 is immersed in an alcohol solution containing a pigment and penetrated. Is 98% or more.

When the multilayer optical interference film is immersed in an alcohol solution in which a pigment such as a blue pigment is dissolved, if the coating is dense and strong, the penetration of the pigment is small, and if it is a blue pigment, the visibility is good. Then, quantitatively, the wavelength 55 before and after the film formation is obtained.
What is necessary is just to measure the transmittance at 0 to 650 nm, whereby the quality of the formed film can be selected.

According to a seventh aspect of the present invention, there is provided a bulb with a reflecting mirror, wherein the reflecting mirror is provided inside the reflecting mirror.
And a bulb according to claim 6.

Since the tube according to any one of claims 1 to 6 is applied to the neck portion of the reflecting mirror or the like through an adhesive or a socket, the tube is applied as one or more. The same operation as described above can be achieved.

Further, the light emitting efficiency can be further improved because of the presence of the reflecting mirror.

[0036]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a halogen lamp L1 for projecting light.
FIG. 2 is an explanatory view schematically showing a partially cross-sectional view of a visible light transmitting infrared reflecting film composed of a multilayer light interference film formed on the surface of the bulb, and FIG. FIG. 3B is an explanatory diagram schematically showing a partial cross section up to the surface, and FIG.

Numeral 1 denotes a bulb made of quartz glass, which has a curved portion having a cylindrical straight tube portion 12 connected to one end of a spheroidal bulging portion 11. Part 12
Is sealed to form a sealing portion 2. An exhaust pipe 13 is connected to the other end of the bulging portion 11.

The sealing portion 2 contains molybdenum Mo.
A pair of metal foils 3 and 3 made of a material such as molybdenum (Mo) are connected to one end of each of the metal foils 3 and 3 to extend inward of the bulb 1 and be made of molybdenum Mo wire or the like.
On the other end, the molybdenum M
An external lead wire (not shown) made of an o-wire or the like is connected.

Then, between the internal lead wires 31, 31,
A double coiled filament 4 wound with a tungsten W wire is connected and arranged along the central axis of the bulb 1. In the figure, 41 is a bead made of an electrical insulator,
An anchor 42 holding the inner lead wires 31 and 31 and supporting the filament 4 is implanted.

In the valve 1, a small amount of CH ₂ Br ₂
And CH ₃ halides and argon Ar or krypton Kr, nitrogen N ₂ and was mixed with gases such as Br are are sealed.

A curved outer surface portion extending from the exhaust pipe 13 of the valve 1 to the bulging portion 11 and the straight pipe portion 12 has:
Visible light transmitting infrared reflecting film (hereinafter referred to as red film) 5
Is formed. When the cross section of the red film 5 is enlarged and schematically viewed, as shown in FIG. 2, the glass surface on the outer surface of the bulb 1 is composed of a high refractive index layer film 5H made of titanium oxide TiO ₂ and silicon oxide SiO _2. The low-refractive-index layer films 5L,... Are alternately repeated to form a multilayer optical interference film in which 8 to 50 predetermined layers are laminated.

The multilayer optical interference film 5 is made of a film forming material (Ti
O ₂ and SiO ₂ ) are heated to melt and evaporate gaseous atoms or molecules to be incident on the glass surface, adhere to the glass surface and solidify to form a solid, which is sequentially laminated and coated. That is, the layers are formed by vapor phase growth.

What is important is the direction of the vapor phase growth.
As shown in FIG. 2, gaseous atoms or molecules come in and are deposited in a columnar manner within a range θ of 30 degrees or less with respect to a perpendicular D-DA on the surface of the valve 1 and are layered one after another.

In this layering, the top of the end of the valve 1, the sealing portion and the exhaust pipe are heat-processed, so that fine powder of silica (silicon oxide SiO ₂ ) adheres to the surface near these portions. Therefore, if the formation angle in the vapor phase growth direction is reduced, a more precise lamination can be performed.

The irregularities on the surface of the red film 5 are shown in FIG.
As shown in (a), in the high refractive index layer film 5H as the outermost layer, the relationship a / b of the protruding height a or the concave height to the layer thickness b is preferably 20% or less.

If it exceeds 20%, the difference in surface irregularities is large, and a predetermined wavelength is not transmitted or reflected,
That is, there is a problem that a desired light emission characteristic cannot be obtained due to scattering of visible light or infrared light.

Further, in order to reduce the unevenness of the surface of the red film 5, it is necessary that the surface of the bulb 1 as a base has high smoothness. Regarding the roughness Ra (center line average roughness) of the surface of the valve 1, the experiment conducted by the present inventors was 0.1 to 0.1.
It should have been 3.0 nm.

The roughness of the outer surface of the bulb 1 is in a state as shown in FIG. 3B, for example. The roughness Ra is measured by a surface roughness meter “nm profile measuring microscope VZ” manufactured by Keyence Corporation. -7700 ".

When the thickness exceeds 3.0 nm, the unevenness of the surface of the formed red anti-reflection film 5 becomes large and there is a problem that desired emission characteristics cannot be obtained similarly to the above. The glass surface may be treated with an abrasive or hydrofluoric acid, and the surface may be polished to improve smoothness.

In the drawing, reference numeral 6 denotes a base which is mechanically bonded to the crushable sealing section 2 with a heat-resistant adhesive or interposed therebetween, and a shell 61 and an eyelet 62 are provided so that the ends of external lead wires (not shown) are not short-circuited to each other. Are electrically connected to each other by means such as welding or brazing.

When the halogen bulb L1 having such a configuration is turned on, the filament 4 disposed along the central axis of the bulb 1 generates heat and emits a large amount of infrared light together with visible light. Most of the visible light passes through the bulb 1 and the red film 5 and is emitted to the outside of the bulb 1.

Further, 700 radiated from the filament 4
Infrared light up to about 2000 nm as well as the wavelength range of about 1500 nm is reflected by the red film 5 and returned to the filament 4.
(The emission of the infrared light from the filament 4 and the reflection from the red film 5 are repeated.) The filament 4 is reheated to increase the light emission. As a result, the visible light emission from the filament 4 is increased, and the light emission is increased. Efficiency can be improved.

Next, a method of forming a coating made of the multilayer optical interference film constituting the red anti-reflection film 5 on the outer surface of the bulb 1 will be described with reference to FIG. This coating is formed by an ion plating apparatus, and FIG.

In FIG. 4, reference numeral 8 denotes a chamber. An exhaust pipe 82 connected to a vacuum pump 81, an argon gas supply pipe 83 for supplying argon gas Ar,
An oxygen gas supply pipe 84 for supplying oxygen gas O ₂ is connected thereto, and these pipes 82, 83, 84 are provided with valves 85, 86, 87, respectively.

A crucible 91 for accommodating a deposition material and a plasma gun (not shown) for irradiating a high-density plasma beam are provided at the bottom of the chamber 8, and a spiral high-frequency wave is provided above the crucible 91. A coil 92 is arranged.

Above the high frequency coil 92, a bulb L for forming a visible light transmitting infrared reflecting film composed of a plurality of layers is formed.
A driving device (not shown) is arranged such that the first valve 1 is rotated in the direction of the arrow X and revolves in the direction of the arrow Y while the valve shaft is inclined A (0 to 30 degrees) by a jig (not shown). ).

A high-frequency oscillator 93 is connected to the high-frequency coil 92 via a matching box 94. Reference numeral 95 denotes a variable DC power supply having the negative electrode side connected to the valve 1, and reference numeral 96 denotes a heater provided in the upper part of the chamber 8.

A method for forming a coating on the outer surface of the bulb 1 of the electric bulb L1 using the apparatus 9 will be described. First, a jig (not shown) in the chamber 8 supports the bulb 1 of the bulb L1 in a state where the bulb axis is inclined at A degrees (0 to 30 degrees). Metal titanium Ti is contained in the crucible 91 as a material for forming the layer film 5H.

In this state, the valve 85 connected to the vacuum pump 81 is opened, and the inside of the chamber 8 is evacuated through the exhaust pipe 82 to a predetermined degree of vacuum.

Thereafter, the valve 1 is rotated in the direction of the arrow X and revolved in the direction of the arrow Y via a driving device, and the outer surface temperature of the valve 1 is set to 300 by the heater 96 provided in the upper part of the chamber 8. Heat to about 350 ° C.

Next, the valve 86 connected to the argon gas supply pipe 83 is opened, and the argon gas A is introduced into the chamber 8.
supply r. The partial pressure of the argon gas Ar in the chamber 8 is set to 0.5 × 10 ^{−4 to} 3 × 10 ⁻⁴ Torr.

Next, the valve 1 is rotated in the direction of the arrow X and revolved in the direction of the arrow Y via a driving device (not shown), and a heater 96 provided in the upper part of the chamber 8 is provided.
To heat the outer surface of the bulb 1 to about 300 to 350 ° C. Next, the valve 97 connected to the oxygen gas supply pipe 84 is opened to supply the oxygen gas O ₂ to the chamber 8, and the partial pressure of the oxygen O ₂ in the chamber 8 is reduced to 1.0 × 10 2.
^-4 torr. In this state, a high frequency power of about 13.56 MHz and about 300 W is supplied from the high frequency transmitter 93 to the high frequency coil 92.

In this way, the Ti vapor evaporated in the crucible 91 is ionized by the high-frequency plasma, and the ions are attracted to the negatively charged surface of the bulb 1 and the TiO is deposited on the outer surface of the bulb 1. ₂ vapor deposition film adheres.

Next, as a material for forming the low refractive index layer film 5L,
Silicon oxide SiO in crucible 91 _TwoContaining the powder,
As above, SiO_TwoIf TiO is evaporated_TwoSteaming
SiO on the deposition film 5H_TwoIs deposited.

In this way, TiO ₂ forming the high refractive index layer films 5H,... And SiO ₂ forming the low refractive index layer films 5L,. The halogen lamp L1 having the bulb 1 in which the red film 5 is formed as shown in FIG.

In the present invention, when the coating film 5 is formed on the surface of the bulb 1 of the electric bulb L1, atoms or molecules of the film forming material evaporated from the crucible 91 serving as the evaporation source are subjected to high-speed plasma by high-density plasma from a plasma gun. At high ion efficiency, the particles fly and adhere to the surface of the bulb 1 to be solidified and solidified. The deposition of the film forming material is continued, and when the film thickness reaches a predetermined film thickness by a film thickness sensor (not shown), the vapor deposition is stopped.

The direction of the vapor phase growth of each of the layers 5H,..., 5L,... Is obtained within the range θ of 30 degrees with respect to the perpendicular D-DA of each part of the valve 1. In this case, the angle between the support angle of the bulb 1 and the angle of the evaporation direction of the deposit may be set to 30 degrees or less. If the vapor phase growth direction is at an angle θ of more than 30 degrees with respect to the perpendicular DD of the bulb 1, the atoms and molecules of the film-forming material coming from the oblique direction will be incident and stacked. As a result, there arises a problem that turbidity occurs or a gap is generated, and scattering or the like occurs without performing predetermined transmission or reflection.

The tube of the present invention as described above is
By performing the following measurement, the quality of the formed multilayer optical interference film can be selected.

The transmittance at a wavelength of 550 to 650 nm of the bulb on which the multilayer optical interference film is formed is measured, and this value is set to 100%. Then, the multilayer optical interference film formed on the bulb is immersed in an alcohol solution to which a pigment is added to penetrate, and the transmittance at a wavelength of 550 to 650 nm is measured. If the transmittance at this time is 98% or more, It is assumed that the absorption by the multilayer optical interference film is small and good.

In the above, when the multilayer optical interference film is immersed in an alcohol solution containing a pigment, for example, a blue pigment, if the film is dense and strong, the penetration of the pigment is small. It is colored and the void is visible. In addition, quantitatively, the wavelengths 550 to 65 before and after the film formation are measured.
The transmittance at 0 nm may be measured and compared, whereby the quality of the formed film can be selected.

FIG. 5 shows a tube according to another embodiment of the present invention. FIG. 5 is a partial sectional front view of a reflector-equipped light bulb RL in which a light bulb and a reflector are integrated, and the same parts as those in FIG. 1 are denoted by the same reference numerals and description thereof is omitted.

The bulb L2 is a bulb 1 made of quartz glass.
Has a spherical shape, and a crush seal portion 2 is formed at an end portion.
An exhaust pipe 13 is connected to the other end.

A double-coil filament 4 is connected between the distal ends of the internal lead wires 31 connected to one end of the pair of metal foils 3 in the sealing portion 2 to form a spherical valve. It is disposed at a position passing through one focal point. External lead wires 35, 35 are connected to the other ends of the metal foils 3, 3, respectively. The bulb 1 is filled with a halide and an inert gas.

A spherical part is formed from the exhaust pipe 13 of the valve 1.
The curved outer surface portion extending over the bulging portion 11
Visible light with the same configuration and means as described in the form
The transmitted infrared reflection film 5 is formed. That is,
Depending on the length, titanium oxide TiO_Two
, Made of silicon oxide SiO _Two
Are alternately repeated with the low refractive index layer films 5L,.
The multilayer optical interference film is formed by stacking up to 50 predetermined layers.

Reference numeral 7 in the figure denotes a reflecting mirror having an inner surface such as a paraboloid of revolution or a spheroid formed of hard glass, a heat-resistant synthetic resin or a metal plate. A light / heat reflection film 71 made of silver or the like or a visible light reflection infrared transmission film 71 such as a dichroic film
Is formed, and a base 72 at the center thereof has a recess 73 for accommodating the crushed sealing portion 2 of the bulb L1. Then, a heat-resistant adhesive 74 made of silicon or the like is injected in a state where the crushed sealing portion 2 of the electric bulb L2 is arranged in the recess 73, and when the focusing of the filament 4 position with respect to the reflection surface 71 is completed, this adhesive is used. 74 is solidified, and the two are integrated to form a bulb RL with a reflector.

When the light bulb L2 shown in FIG. 5 is turned on, the light-emitting characteristic of the light bulb L2 is increased similarly to the light bulb L1 described in the above embodiment, and the light emission characteristic from the reflecting mirror 7 is also improved. be able to.

Further, a visible light-reflecting infrared transmitting film 71 made of a multilayer light interference film may be formed on the reflecting mirror 7 having a curved surface used for the bulb RL with a reflecting mirror by means of the present invention.
Also in this case, since the coating 71 having a uniform thickness can be formed, transmission and reflection of a predetermined wavelength in the reflecting mirror 7 can be efficiently performed, and the optical characteristics can be improved.

Next, a bulb according to another embodiment in which the present invention is applied to a high-pressure discharge lamp will be described. FIG. 6 is a front view of the metal halide lamp L3. The same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted.

In this metal halide lamp L3, the bulb 1 made of quartz glass has an elliptical shape, and a crush seal portion 2 is formed at an end. Further, the exhaust pipe 13 is provided on the other end side.
Is connected.

Coil-shaped discharge electrodes 4A, 4A serving as a light source are provided at predetermined ends of the internal lead wires 31, 31 connected to one ends of the pair of metal foils 3, 3 in the sealing portion 2. External lead wires 35 are connected to the other ends of the metal foils 3 and 3 at intervals of a discharge interval.

The valve 1 is filled with a halide such as ScI-NaI and an inert gas.

Further, a visible light transmitting infrared reflecting film 5 is formed on the outer surface portion extending from the exhaust pipe 13 of the valve 1 to the elliptical bulging portion 11 by the same structure and means as described in the above embodiment. I have. That is, a high refractive index layer film 5H made of titanium dioxide TiO ₂ and a low refractive index layer film 5L made of silicon oxide SiO ₂ are alternately repeated on the glass surface on the outer surface of the bulb 1 by vapor phase growth. 8 to 5
The multilayer optical interference film is formed by laminating 0 predetermined layers.

This metal halide lamp L3 is connected to a lighting circuit device having a ballast and the like, and is lit. When the metal halide lamp L3 is turned on, the temperature is high, and there are many heat rays. However, since the visible light transmitting infrared reflection film 5 made of a multilayer light interference film is formed on the surface of the bulb 1, the infrared light in the bulb 1 returns to the discharge path. This has the effect of increasing the heat generation to improve the light emission characteristics and reducing the radiation of heat rays to the outside of the lamp L3.

The present invention is not limited to the above embodiment. For example, the sealing portion formed at the end of the bulb of the bulb is not limited to the one formed at one end, and the sealing portion may be provided at both ends of the bulb. The sealing portion formed by shrinking the valve is not limited to the crushing sealing, and a sealing member formed of a linear shape or the like may be used without being limited to a metal foil such as a molybdenum foil.

The glass material of the bulb is not limited to quartz glass, but may be any other hard or soft glass material as long as it has the required translucency, light refractive index and heat resistance.

Further, in the above embodiment, titanium oxide TiO _{2 is used} for the high refractive index layer film, and silicon oxide S
Although iO ₂ was used, the present invention is not limited to this. For example, tantalum oxide Ta ₂ O ₅ , zircon oxide ZrO ₂ , and zinc oxide ZnO ₂ are used as the high refractive index layer film, and magnesium fluoride MgF is used as the low refractive index layer film. You may.

Further, the bulb with a reflecting mirror may be a discharge lamp instead of an electric bulb, and is not limited to one in which both are integrated with an adhesive, and a reflecting mirror with a socket or a socket and a reflecting mirror are separately provided. It is possible to use a device in which a tube is attached to the above device.

[0088]

According to the first, second and fifth aspects of the present invention,
Since the unevenness on the surface of the multilayer optical interference film is eliminated and a smooth surface with high precision is obtained, it is possible to provide a tube in which defects such as white turbidity and voids are eliminated in the coating film, undesired scattering, and improved light emission characteristics.

Further, according to the third aspect of the invention, it is possible to form a multilayer optical interference film corresponding to the curved surface shape of the bulb, and the same effect as described in the first aspect can be obtained.

According to the fourth aspect of the present invention, the multilayer optical interference film can be easily formed by the ion plating method.

According to the invention of claim 6, it is possible to reliably and easily determine the quality of the multilayer optical interference film.

Further, according to the seventh aspect of the present invention, the same effect as described in the first aspect can be obtained by applying the present invention to a tube with a reflecting mirror. Further, the presence of the reflecting mirror further improves the luminous efficiency.

[Brief description of the drawings]

FIG. 1 is a front view showing a bulb (a light-emitting halogen bulb) according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram schematically showing an enlarged partial cross section of a multilayer optical interference film formed on the surface of a bulb in FIG. 1;

FIG. 3 (a) is an explanatory view schematically showing an enlarged partial cross-section near the outer surface of a multilayer optical interference film formed on the surface of a bulb, and FIG. 3 (b) is the outer surface of the bulb. It is explanatory drawing which expands and shows the partial cross section typically.

FIG. 4 is a schematic configuration diagram of an ion plating apparatus.

FIG. 5 is a partial cross-sectional front view of a bulb (a bulb with a reflector) according to another embodiment of the present invention.

FIG. 6 is a front view of a tube (metal halide lamp) according to another embodiment of the present invention.

[Explanation of symbols]

 L1, L2: bulb (bulb) L3: bulb (metal halide lamp) RL: bulb (bulb with reflective mirror) 1: glass bulb 2: sealed part 4: light source (coiled filament) 4A: light source (discharge electrode) 5) Multilayer light interference film 5H: High refractive index layer 5L: Low refractive index layer 7: Reflecting mirror 9: Ion plating device

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Makoto Sakai 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Lighting & Technology Corporation (72) Dr. Kamata 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo F-term (reference) in Toshiba Lighting & Technology Corporation 5C043 AA15 AA20 CC03 DD31 EA14 EC13

Claims (7)

[Claims] 1. A glass bulb having a continuous curved portion; a light source disposed in the bulb; and forming a vapor phase growth direction on the surface of the bulb at an angle of 30 degrees or less with respect to a perpendicular from the surface. A multi-layered optical interference film. 2. The multilayer optical interference film on the surface of the glass bulb,
2. The bulb according to claim 1, wherein a formation angle in a vapor growth direction on an end side with respect to a center of the bulb is small. 3. The glass bulb has a spherical shape, an elliptical shape,
The bulb according to claim 1, wherein the bulb has a shape having at least one kind of curved surface portion selected from an elliptical shape, a conical shape, and a cylindrical shape. 4. A multilayer optical interference film on a surface of a glass bulb,
The tube according to any one of claims 1 to 3, wherein the tube is formed by an ion plating method. 5. The multi-layer optical interference film formed on the surface of the glass bulb, wherein the difference in the height of the outermost layer is 20% or less of the outermost layer thickness. A tube according to claim 1. 6. The wavelength 550 of the multilayer optical interference film formed on the bulb of the tube according to claim 1.
The multilayer light interference film formed on the bulb of the tube according to any one of claims 1 to 5 is immersed and permeated in an alcohol solution containing a pigment for a transmittance of 100% at 〜650 nm. A tube having a transmittance at a wavelength of 550 to 650 nm of 98% or more. 7. A tube with a reflecting mirror, comprising: a reflecting mirror; and the tube according to claim 1 disposed in the reflecting mirror.