JPH1055786A - Electric bulb with reflection mirror and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce irregular color of an irradiation face and improve light distribution characteristics and luminescence efficiency by combining an electric lamp forming a visible light transmission infrared ray reflection film with a reflection mirror. SOLUTION: In radiation light of a tungsten halogen lamp L1, beam Y toward a reflection mirror 7 is incident on a visible reflection film 8, the visible light is reflected, a reflection light Z is radiated from an opening part, and an infrared ray V transmitting a red reflection film 6 transmits a visible reflection film 8 and is radiated on a back face of the reflection mirror 7. Consequently, an lamp RL1 emits beams in which infrared rays are reduced from an opening part of the reflection mirror 7 and a majority of infrared rays from the back face of the reflection mirror 7, respectively. When the electric lamp L1 is disposed from an elliptical focus near a bottom face of the reflection mirror 7, a bulb part 11 in which the shape of the bulb 1 is suddenly and greatly changed near a crash sealing part 3 in which a film thickness of the red reflection film 6 is thick is more downward than a virtual line 7 not protruded into the reflection face 8, and an incident angle to a reflection face 71 of the reflection mirror 7 is an opening 73, generation of irregular color due to distortion of wavelength can be reduced free of the reflection light from this part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb with a reflecting mirror suitable for spot lighting and the like, and a lighting apparatus equipped with the light bulb.

[0002]

2. Description of the Related Art Halogen lamps use a halogen cycle of halogen in which tungsten evaporating from a filament is sealed in a bulb, and return to the filament to prevent blackening of the bulb, improve efficiency and extend the life of the bulb. is there. This halogen bulb is designed to have a small diameter, such as a tube, so that the temperature of the glass bulb becomes high in order to smoothly carry out the halogen cycle, and the length of the bulb ranges from short to long depending on the application.

[0003] These light bulbs are used in combination with a reflector to exhibit higher efficiency. For example,
For a light bulb having a relatively short overall length, a reflecting mirror having a bowl-shaped reflecting surface is frequently used, and for a long-length bulb, a reflecting mirror having a gutter-shaped reflecting surface is often used.

A light bulb with a reflector in which a light bulb having a relatively short length and a reflector having a bowl-shaped reflection surface are integrally combined has recently been used for downlights because of its small size and high efficiency. Home use for spotlights and optical equipment,
It has come to be widely used in stores, office automation equipment, and the like.

On the other hand, a light bulb emits light by energizing a coiled filament wound with a tungsten wire, but the actual light radiation energy is about 12 (with a double coil).
%, The thermal radiation energy is about 74%, and the rest is heat loss due to the gas in the bulb, the lead wire, etc., and it is known that most of the energy does not contribute to light emission.

Therefore, as means for utilizing wastefully dissipated heat energy, a visible light transmitting infrared reflecting film is formed on the surface of a bulb of a light bulb, and infrared light emitted from the filament is reflected by this reflecting film to the filament. Let me return,
Thereby, the filament is further heated to increase the luminous efficiency.

As this visible light transmitting infrared reflecting film, two kinds of films having different refractive indexes, for example, titanium oxide (TiO 2)
₂ ) High refractive index layer and silicon dioxide (SiO ₂ )
And a low refractive index layer composed of 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. The greater the number of the high and low refractive index layer films, the higher the infrared reflectance, the higher the luminous efficiency, and the greater the power saving effect.

In the above-mentioned light bulb with a reflecting mirror,
Halogen bulbs having a visible light transmitting infrared reflecting film formed of a multi-layered light interference film formed on the bulb surface are used, and the light emitting characteristics are further improved. For example, as shown in FIG. 7, the bulb D with a reflecting mirror has a coiled filament C and an inert gas containing halogen sealed therein, and a sealing portion S at one end and an exhaust pipe E at the other end. Selection of a halogen bulb L having a visible light transmitting infrared reflecting film F formed on the surface of the formed glass bulb G, and a visible light reflecting infrared transmitting film etc. formed on a concave curved surface R such as a paraboloid of revolution. A reflection mirror M having a transmission / reflection film J and a neck portion N opened rearward from the bottom of the reflection surface R, comprising a sealing portion S of the bulb L within the opening H; B was configured so that both were joined and fixed.

However, when the above-mentioned light bulb D with a reflecting mirror is mounted on a lighting fixture and illuminated to illuminate the displayed product, the undesired color unevenness such as a rainbow-like color is produced on the illuminated surface which should be colorless. May not be seen in the correct color or may appear unpleasant in severe cases.

The inventor of the present invention has investigated the undesired color formation and found that the visible light-reflecting infrared transmitting film F formed on the surface of the bulb G is present. That is, the light bulb L
The sealing portion S formed by crushing the end of the bulb G is formed by heating the bulb G and pressing it with a pincher or the like.
The thickness of the visible light-reflecting infrared transmitting film J formed in the deformed portion G1 located near the sealing portion S tends to be thicker than that of the smooth surface. The same can be said for the portion to which the exhaust pipe E having a smaller diameter than the diameter of the valve G is connected.

The visible light-reflecting infrared transmitting film J composed of the multi-layered optical interference film is obliquely incident on the film because the thickness and the like are designed in a direction perpendicular to the film surface by design. As the incident light, that is, the incident angle increases, the film thickness increases and the transmission wavelength shifts.

When the bulb D with a reflector is turned on, the visible light transmitting infrared reflecting film F having the deformed portion G1 on the sealing portion S side of the bulb L is thick. The wavelength of the reflected light is shorter than the wavelength of the reflected light because the light is obliquely incident on the film, and the film is disposed so as to face the portion where the incident angle to the reflecting surface R in the reflecting mirror M is large. , And undesired color unevenness has occurred on the irradiation surface.
At this time, the bulb L in which the exhaust pipe E is provided at the top of the bulb G has a portion whose diameter is sharply reduced due to the connection with the exhaust pipe E. There is only direct light that is radiated outward from this part as it is far away, and since this direct light is radiated over a wide range, the irradiation light from the top may cause color shift etc. Is less.

The visible light transmitting infrared reflecting film F is formed by an immersion method, an evaporation method, a sputtering method, an ion plating method, or the like. Of these, the immersion method of dipping a valve in a film forming solution and pulling it up is simple, cost-effective, and widely used.However, any valve, such as a straight tube, a sphere, or an oval, can be used on a film formation surface. If there is a curved surface or uneven surface, the coating liquid will accumulate in the part where the curvature changes significantly after the valve is pulled up from the solution or in the concave part, and the film thickness of the formed film will be partially non-uniform Sometimes. In addition, even in other methods such as a vapor deposition method, a film having a uniform thickness is obtained by rotating the valve, but when the valve has a curved surface or an uneven surface, a uniform film thickness is obtained. It was difficult.

If the thickness of the film is not uniform, transmission or reflection of a predetermined wavelength is not performed, and desired optical characteristics cannot be obtained.
In addition to lowering the light-emitting characteristics of the light bulb, the multi-layer film made up of multiple layers of different materials has different thermal expansion coefficients, so the film cracks when subjected to thermal shocks repeatedly applied to high and low temperatures due to flashing of the light bulb. And peeling easily occur.

[0015] Further, even if the surface of the valve has irregular surfaces such as irregularities, as a means for making the thickness of the coating uniform, it is possible to change the speed at which the valve is pulled out of the solution according to the surface condition. However, it takes a long time to work, and in the case of a volatile solution, the viscosity of the solution changes over time, which requires a great deal of time for solution management, and in the case of mass-producing light bulbs, it may be unsuitable for productivity. For some reason, it is actually unavoidable to use a light bulb having a certain variation in the film thickness.

[0016]

SUMMARY OF THE INVENTION The present invention relates to a reflecting mirror having a curved reflecting surface capable of reducing the occurrence of color unevenness on an irradiation surface and obtaining high light emission characteristics, and a visible light transmitting infrared reflecting device for a bulb surface. An object of the present invention is to provide a light bulb with a reflector, which is combined with a light bulb having a film, and a lighting device equipped with the light bulb.

[0017]

According to a first aspect of the present invention, there is provided a bulb with a reflector having a bulging portion formed in a curved surface and a sealing portion provided in connection with the bulging portion. A valve, a filament disposed substantially on the central axis of the valve,
One end is connected to the filament and the other end is configured to include a lead wire embedded in the sealing portion, a sealing gas sealed in the bulb, and a visible light transmitting infrared reflection film formed on the bulging portion. A light bulb, a reflective surface formed in a concave curved surface, and an opening provided at the bottom of the reflective surface, and a neck portion formed such that a part of the bulb bulge is disposed in the opening. And a reflecting mirror.

The infrared light emitted from the filament is returned to the filament by the visible light transmitting infrared reflection film formed on the surface of the bulb having a curved surface such as a sphere, a spheroid, a parabola, and an ellipsoid of revolution, and the filament is reheated. To increase the emission, and thus increase the visible light emission from the filament. Further, the shape of the valve may be formed from a single curved surface or a compound curved surface.

In the case of a reflecting mirror having a reflecting surface such as a rotating spherical surface, a spheroidal surface, or a paraboloid of revolution and having a visible-light-reflecting infrared transmitting film formed thereon, the light emitted from the light bulb passes through the opening of the reflecting mirror. The visible light transmitting infrared reflecting film formed near the sealing part that narrows the bulb bulb end while emitting most of the infrared light from the back of the reflecting mirror and the infrared light reduced from the part (visible light), Even if the film thickness is thick at the location where the bulb shape changes drastically, the bulb should be located closer to the bottom of the reflector than the focal point of the reflector and the reflector should be extended at the opening. From the imaginary line formed by the bulb, so that the sealing portion of the light bulb does not protrude toward the reflecting surface, and the portion where the angle of incidence on the reflecting surface of the reflecting mirror is large is within the opening, so there is no reflected light from this portion, and the wavelength Color unevenness due to misalignment It can be stopped.

At this time, the bulb in which the exhaust pipe is provided at the top of the bulb has a portion whose diameter is sharply reduced by connection with the exhaust pipe, but the top of this bulb is farthest from the reflecting mirror. At the same time, there is only direct light from which light is directly radiated outward, and since this direct light is radiated over a wide range, there is no occurrence of color misregistration etc. in the light irradiated from the top. Absent.

The shape of the reflecting surface can be selected according to the shape of the curved surface of the bulb, or the shape of the curved surface of the valve can be selected according to the shape of the reflecting surface.

The red anti-reflection film formed on the reflection surface is formed by alternately layering high-refractive-index layers and low-refractive-index layers.
O ₂ ), tantalum pentoxide (Ta ₂ O ₅ ), zircon dioxide (ZrO ₂ ), zinc dioxide (ZnO ₂ ), and the like, and silicon oxide (SiO ₂ ) and magnesium fluoride (MgF) for the low refractive index layer film. Yes, it is only necessary to select from these materials, that is, it is only necessary that the materials to be combined have a refractive index difference. Also,
Aluminum (Al), silver (A)
g), gold (Au), chromium (Cr) and the like.

The light bulb to which the present invention is applied may be a light-emitting light bulb for downlights or spotlights, or a light bulb for use in homes, stores, office automation equipment, and the like for optical equipment. Further, the present invention is not limited to a bulb in which only an inert gas is enclosed in a bulb, and may be a halogen bulb in which a halide is enclosed. Further, the sealing portion formed on the valve is not limited to the crushing sealing portion, but may be a sealing portion having another configuration in which the valve is contracted or sealed via a stem.

According to a second aspect of the present invention, there is provided a bulb with a reflector, a bulb having a sealing portion at an end, a filament disposed substantially on a central axis of the bulb, and one end connected to the filament. A bulb having an end embedded with a lead wire embedded in the sealing portion, a sealed gas sealed in the bulb and a visible light transmitting infrared reflection film formed on the bulb surface, and a concave curved surface A second reflecting surface including a reflecting surface and an opening provided at the bottom of the reflecting surface, the second reflecting surface being formed so that the diameter of the opening gradually decreases;
And a reflector having a neck portion on which a part of the bulb on the sealing portion side of the bulb is disposed on the reflection surface side.

The same operation as the above-mentioned claim 1 is achieved. In addition, the infrared light emitted from the filament by the visible light transmitting infrared reflecting film formed on the surface of any one or more kinds of curved valves such as a cylinder, a sphere, a spheroid, a rotating parabola, and a rotating ellipsoid. Can be returned to the filament to increase visible light emission.

The reflecting mirror having a concave curved reflecting surface may be formed from a compound curved surface. This is when there is a molding problem such as the production of reflectors or deformation around the opening of the central neck part, if one reflecting surface can not cope with the length of the filament arranged along the axis. In this case, two or more reflecting surfaces can be provided by connecting a plurality of reflecting surfaces.

When the two reflecting surfaces are connected to each other, the reflecting surface may be formed at the same focal point, and the focal point may be different along the length of the filament, so that the corresponding range with the filament may be widened. .

According to a third aspect of the present invention, there is provided a bulb with a reflecting mirror, a bulb having a bulging portion formed in a curved surface and a sealing portion provided in connection with the bulging portion, and substantially the center of the bulb. A filament disposed on the shaft, one end connected to the filament and the other end embedded in the sealing portion, a sealing gas sealed in a bulb, and visible light formed in the bulging portion A light bulb configured to include a transmitted infrared reflecting film, a second reflecting surface formed in a concave curved surface and an opening provided in the bottom of the reflecting surface, the opening diameter being gradually reduced; A reflecting mirror having a reflecting surface and a neck portion on the second reflecting surface side where a part of the bulb bulge is disposed.

The same operation as described in the first and second aspects is provided.

A bulb with a reflector according to a fourth aspect of the present invention is a bulb having a bulged portion formed in a curved surface and a sealing portion provided in connection with the bulged portion, and substantially the center of the bulb. A filament disposed on the shaft, one end connected to the filament and the other end embedded in the sealing portion, a sealing gas sealed in a bulb, and visible light formed in the bulging portion A light bulb including a transmitted infrared reflection film, a reflection surface formed in a concave curved surface, an opening provided in the bottom of the reflection surface, and light emitted from one end and the other end of the filament irradiates the opening end. In this case, a reflector having a neck portion provided with a sealing portion is provided so that the angle between each irradiation light beam and the bulb is 45 to 135 degrees.

The light emitted from each part of the filament of the bulb is
When the light passes through the glass bulb and the visible light transmitting infrared reflecting film and faces the reflecting surface of the reflecting mirror, and passes through the infrared reflecting film, the light directed in the direction perpendicular to the infrared reflecting film (bulb) outputs the designed wavelength. Is done. However, the incident light from the direction inclined with respect to the infrared reflection film (bulb) passes through the infrared reflection film obliquely, so that it passes through a thicker film and becomes the same, and the output light has a different wavelength. This appears as uneven color on the irradiated surface. This becomes more conspicuous as the angle of incidence on the infrared reflective film increases.

However, the angle θ at which the straight line connecting the one end and the other end (the upper end and the lower end) of the filament and the opening end facing the neck of the reflecting surface intersects with the bulb (infrared reflecting film) surface. If it is within the range of 45 to 135 degrees, there was no problem in color misregistration.

Therefore, it is possible to design the length and arrangement of the filament, the curvature and the inclination of the bulb forming the visible light transmitting infrared reflection film, the curvature and the inclination of the reflecting mirror surface, etc. in consideration of the upper and lower ends of the filament.

According to a fifth aspect of the present invention, there is provided a light bulb with a reflector, comprising: a ceramic housing joined to a neck portion of the reflector; and a base attached to the housing. I do.

Since a metal cylindrical base is attached to the neck portion of the reflecting mirror via an electrically insulating casing, safety is high when attaching / detaching to / from a socket of an instrument or the like. Connection and bulb retention.

The shape of the ceramic housing is cylindrical or prismatic, and has a concave portion in the center of which the neck portion of the reflector is loosely inserted, and a base is provided on a half-facing side of the concave portion.

The metal base constituting the electrical connection portion has a cylindrical shape having a threaded portion to be screwed into the socket, a prismatic shape having terminal pins planted, and the like.

A bulb with a reflector according to claim 6 of the present invention is characterized in that a part of the bulging portion is made of one of a sphere, a spheroid, a paraboloid of revolution, and an ellipsoid of revolution. . The same operation as the above-mentioned claim 1 is exerted. Further, by adopting the bulb shape, the angle between the filament and the bulb of the radiated light traveling from the filament toward the open end can be adjusted to a predetermined value. That is, the curvature of the bulb may be selected according to the length of the filament, the position of the end portion, the shape of the reflection surface, and the reflection characteristics.

The light bulb with a reflecting mirror according to a seventh aspect of the present invention is characterized in that an adhesive is interposed between the sealing portion and the opening.

By fixing the sealing portion of the bulb at a predetermined position in the opening with an adhesive, the bulb and the reflecting mirror can be integrated, and a portion which tends to have an undesired film thickness is covered with the adhesive to shield light. Can be. Also, the corresponding position between the filament and the reflecting surface is maintained during the lifetime.

The light bulb with a reflector according to the eighth aspect of the present invention is characterized in that a front cover is provided in front of the reflector. By covering the front surface of the reflector with a transparent cover, lens or prism, it is possible to change the light emission characteristics such as light distribution, to prevent the reflection surface and the bulb surface from becoming dirty, and to prevent scattering when the bulb bulb should burst. . In the case of a transparent cover, magnesium fluoride (MgF)
If an antireflection agent such as is applied, the luminous efficiency can be improved.

According to a ninth aspect of the present invention, there is provided a lighting device, wherein the lighting device includes a lighting device body, a socket disposed on the lighting device body, and a light bulb with a reflecting mirror according to any one of claims 1 to 8 mounted on the socket. And characterized in that:

The luminaire has the same function as described in the first to eighth aspects.

The lighting apparatus according to the tenth aspect of the present invention comprises:
A valve having a sealing portion at an end, a filament disposed substantially on the central axis of the valve, and a lead wire having one end connected to the filament and the other end embedded in the sealing portion, and enclosed in the valve. Visible light transmitting infrared reflection film formed on the surface of the bulb and the enclosed gas, the bulb configured to include the base attached to the sealing portion, the appliance body, and the appliance body provided on the concave curved surface. A reflecting mirror including a formed reflecting surface and an opening provided at the bottom of the reflecting surface, a reflecting mirror having a neck portion in which a part of the bulb on the sealing portion side of the light bulb is disposed, and And a socket to which the base of the light bulb is mounted.

The light bulb and the reflector are separate bodies, and the reflector and the socket are attached to the fixture body of the lighting fixture, and can be attached to the socket through the base in the opening of the neck portion.
The same effects as those described in the first to eighth aspects can be obtained. In addition, when the light bulb becomes inconsistent, only the light bulb needs to be replaced without changing the reflector.

[0046]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. Fig. 1 is a rating 1 for a small projector
FIG. 2 is a longitudinal sectional view of a 10 V 50 W light bulb RL1 with a reflector.
FIG. 4 is an enlarged cross-sectional view showing a part of a visible light transmitting infrared reflection film formed of a multilayer light interference film formed on a surface of a bulb.

In the figure, L1 is a halogen bulb, and this bulb L
1 has a bulb 1 made of hard glass such as quartz glass or aluminosilicate glass having a spheroidal shape,
At one end of the bulb 1, a crush-sealing portion 3 is formed by sealing a pair of metal foils 2 and 2 made of molybdenum or the like to which the internal leads 21 and 21 and the external leads 22 and 22 are connected. An exhaust pipe 4 is connected to the other end.
Further, between the internal lead wires 21 and 21 inside the valve 1,
A coil-shaped filament 5 around which a tungsten wire is wound is connected, and is disposed substantially along the central axis of the bulb 1. The bulb 1 is filled with a halide such as CH ₂ Br ₂ (methylene dibromide) and an inert gas such as N ₂ (nitrogen) containing Ar (argon).

Also, in the peripheral portion of the outer surface of the bulb 1,
Visible light transmitting infrared reflecting film (hereinafter referred to as red film) 6
Is formed. As shown in the enlarged view of FIG. 2, the red anti-reflection film 6 has metal oxides such as TiO ₂ (titanium dioxide) and low-refractive-index layer films 6L, 6L, which form high-refractive-index layers 6H,. Metal oxides such as SiO
₂ (silicon dioxide) and a multilayer optical interference film in which predetermined layers are alternately repeated. Then, the red film 6 on the outer surface of the valve 1 is formed by, for example, a dipping method, and the valve portion 11 close to the sealing portion 3 where the valve 1 is squeezed due to the formation of the crushing sealing portion 3 and the shape thereof changes rapidly. Red Antimembrane 6
Is thicker than the film thickness of the central portion 12 as in the conventional bulb.

Reference numeral 7 denotes a reflecting surface 71 made of quartz glass, such as quartz glass, hard glass, a heat-resistant synthetic resin or a metal plate, and selected from a spheroidal surface and a paraboloid of revolution having a focal point on the inner surface. It is a bowl-shaped reflecting mirror provided with. An opening 73 for accommodating the crushed sealing portion 3 of the bulb L1 is provided in a neck portion 72 protruding from the center of the rear surface of the bottom of the reflecting mirror 7.
Is provided.

The reflecting surface 71 formed on the concave curved surface of the reflecting mirror 7 has a visible light reflecting infrared transmitting film (hereinafter, referred to as a visible reflecting film) 8 such as a dichroic film forming a selective transmitting reflecting surface. Are formed. Note that 2 in the figure
Reference numerals 3 and 23 denote a pair of terminal pins connected to the external leads 22 and 22 and extending out of the opening 73.

Then, in the state where a portion including the crushed sealing portion 3 of the electric bulb L1 and the bulb portion 11 having a sharply changed shape near the sealing portion 3 is placed in the opening 73, A virtual line 7A formed by extending the reflection surface 71 at the portion 73 (indicated by a dashed line).
The sealing portion 3 of the light bulb L1 is disposed so as not to protrude toward the reflection surface 71 side, and a heat-resistant adhesive 7
4 is injected, and after the focusing of the position of the filament 5 with respect to the reflection surface 71 is completed, the adhesive 74 is solidified to integrate the two. (After the focusing is completed, the adhesive 74 may be injected and solidified.) Then, in the bulb RL1 with the reflecting mirror having the configuration of FIG. 1, the halogen bulb L1 is connected via the terminal pins 23, 23. When energized and turned on, the filament 5 generates heat and emits a large amount of infrared light together with visible light, and most of the visible light emitted from the filament 5 passes through the bulb 1 and the red film 6 to the outside of the bulb 1. Radiated to In addition, the infrared rays of up to about 2,000 nm as well as the wavelength range of 700 to 1500 nm emitted from the filament 5 are reflected by the red anti-reflection film 6 and returned to the filament 5. The reflection is repeated.) The filament 5 is reheated to increase the light emission, and as a result, visible light emission from the filament 5 increases, and the luminous efficiency can be improved.

The radiated light of the halogen lamp L1 is a direct light X from a portion not facing the reflecting mirror 7, and
The light beam Y directed to the reflecting mirror 7 is incident on the visible reflection film 8, the visible light is reflected, the reflected light Z is emitted from the opening, and the infrared light V transmitted through the red film 6 is transmitted through the visible reflection film 8. The light is emitted to the back of the reflecting mirror 7. At this time, since the bulb portion 11 whose shape has rapidly changed near the sealing portion 3 is in the opening 73 or is covered with the heat-resistant adhesive 74, the radiated light from this bulb portion 11 is reflected by the reflecting mirror 7. It is blocked without being radiated from.

Therefore, this reflector-equipped bulb RL1
Emits a light ray (visible light) whose infrared rays have been reduced from the opening of the reflecting mirror 7 and most of the infrared rays from the back face of the reflecting mirror 7. Then, the arrangement of the halogen bulb L1 was shifted from the focal point of the ellipse to the bottom side of the reflecting mirror 7, and the shape of the bulb 1 near the collapsed sealing portion 3 where the thickness of the red anti-reflection film 6 became thick changed drastically. Since the portion where the angle of incidence on the reflecting surface 71 of the reflecting mirror 7 is large is defined as the opening 73 below the imaginary line 7A where the valve portion 11 does not protrude into the reflecting surface 8, there is no reflected light from this portion and the wavelength shifts. Can reduce the occurrence of color unevenness.

FIG. 3 shows another embodiment of the present invention. In the drawing, the same portions as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. The light bulb with reflector RL2 shown in FIG.
The structure of the reflecting mirror 7 is changed, and an annular concave surface 75 serving as a reflecting surface having a diameter larger than that of the opening 73 is formed around an opening 73 on the reflecting surface 71 side.

That is, the reflecting surface formed on the reflecting mirror 7 is divided into a plurality of stages, and here, a reflecting surface 71 and a concave surface 75 are shown in two stages. This is because when the radiated light from the filament 5 cannot be received by the large reflecting surface 71 on the upper side, the entrance side of the opening 73 at the central bottom of the reflecting surface 71 is further increased so that the inner diameter of the opening 73 is increased inward. The second concave surface (small reflective surface) 75 is formed so as to be gradually narrowed.

The bulb R with a reflecting mirror according to this embodiment
L2 is also the bulb 1 near the crush seal portion 3 of the halogen bulb L1.
The bulb portion 11 whose shape has changed drastically greatly is the reflection surface 8
It is fixed in the opening 73 below the imaginary line 7A that does not protrude inside. The concave surface (small reflective surface) 75 forming the second reflective surface is a reflective surface corresponding to the filament 5 so as to efficiently reflect the radiated light from the filament 5 in a predetermined direction. Also, by increasing the entrance side of the opening 73 in this way, the halogen bulb L1
The sealing work of the sealing portion 3 can be facilitated, and the contact between the bulb L1 bulb 1 and the reflecting mirror 7, which become high in temperature at the time of lighting, can be prevented, and cracks of the bulb 1 due to thermal shock can be prevented. Then, the same operation and effect as those of the above embodiment can be obtained.

FIG. 4 is an explanatory view showing the relationship between the halogen lamp L1 on which the red anti-reflection film 6 is formed and the reflecting mirror 7, and FIG.
1 to 3 are denoted by the same reference numerals, and description thereof is omitted.

Light Y emitted from the filament 5 of the bulb L1
u,..., Yd are transmitted through the glass bulb 1 and the red anti-reflection film 6 and toward the reflection surface 71 of the reflecting mirror 7. In the direction going in the orthogonal direction, the designed wavelength is output. However, the incident light from the direction inclined with respect to the red film 6 (= bulb 1) passes through the red film 6 obliquely, so that it becomes the same as passing through a thick film, and the wavelength of the emitted light to be output. It was found that this appeared differently on the irradiated surface. This becomes more conspicuous as the angle of incidence on the red film 6 (= bulb 1) increases. Of course, it is only necessary to prevent such a phenomenon, but it is actually difficult. However, it has been found that this phenomenon can be reduced to such an extent that it can be practically used in relation to the reflecting surface 71 of the reflecting mirror 7.

According to experiments by the present inventors, a straight line connecting one end (upper end) 5u and the other end (lower end) 5d of the filament 5 and a point (for example, R1) of the reflection surface 71 is formed by the bulb 1 ( The red anti-reflection film 6 is formed on the surface of the bulb 1 and will be described as the same position as the bulb 1.) If the angle θ intersecting with the plane is in the range of 45 to 135 degrees, the color misregistration is very conspicuous within the allowable limit. There was no problem. The state of the color shift due to the angle θ and the visual sensation is as shown in the table below.

[0060]

[Table 1] In addition, from the above, generally, the upper end 5u and the lower end 5d of the filament 5 in FIG. 4 have an upper limit and a lower limit, so that the upper and lower ends 5u, 5d can be grasped and designed.

In the above description, the side of the crushed sealing portion 3 of the halogen lamp L1 is close to the neck 72 of the reflecting mirror 7 having a concave curved surface, and a point of the reflecting surface 71, for example, R1 and the upper end 5u and the lower end 5d of the filament 5 Line Y connecting
u, Yd intersect with the surface of the valve 1 at each angle θ,
is about 95 degrees and about 105 degrees, and is in the range of 45 to 135 degrees, and the color shift is slight and there is no problem.

This is because the reflecting mirror 7 has a plurality of reflecting surfaces 7.
This is also applied to the case shown in FIG.

FIG. 5 shows another embodiment of the present invention. In the drawing, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. The light bulb with reflector RL3 shown in FIG.
In the light bulbs RL1 and RL2 with a reflector shown in FIGS. 1 and 3 (but no terminal pins are connected), a base having an electrically insulating casing is attached to the neck 72 of the reflector 7 via an adhesive or the like. Are joined. More specifically, a ceramic housing 24a having a concave portion, and a conductive member 2 having a substantially cylindrical shape formed of a metal plate or the like and having a spiral screw portion formed therearound.
4b forms a base 24. This base 24
It is an integral part of the electrical connection and retention of the light bulb.

A light bulb RL with a reflector provided with this base 24
1 is mounted on a socket (not shown) and turned on, and can provide the same operation and effects as those of the above embodiment.

FIG. 6 shows a lighting device (lighting fixture) 9 according to an embodiment of the present invention. In the embodiment described above, the halogen lamps L1 and L2 and the reflecting mirror 7 are integrally joined with the adhesive 75. However, the lighting device (lighting fixture) shown in FIG. 6 is provided separately. 9

In the figures, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof will be omitted. In the figure, reference numeral 91 denotes an instrument main body. Inside the main body 91, a bowl-shaped reflecting mirror 7 and a socket 92 are provided facing an opening 73 on a back surface of a neck 72 of the reflecting mirror 7. Also, the sealing portion 3 of the halogen bulb
Is joined to the base 24 via a heat-resistant adhesive 75.

In this lighting device (lighting equipment) 9, a reflecting mirror 7 is provided in advance on a lighting apparatus main body 91, and a halogen lamp L 2 combined with the reflecting mirror 7 is detachable via a base 24 and the filament 5 If the bulb L2 needs to be replaced due to disconnection or the like, the cost is reduced because the reflector 7 can be replaced without replacing the bulb L2. Also in this configuration, of course, the valve portion 11 near the sealing portion 3 to which the base 24 is attached is located in the opening 73 below the imaginary line 7A that does not project into the reflection surface 71 of the reflection mirror 7. Needless to say, this bulb L2 is a socket 9
2 and turned on, and the same operation and effect as in the above embodiment can be obtained.

According to the present invention, in the lighting device (illumination equipment) 9 according to the embodiment shown in FIG.
The light bulb RL3 with a reflector provided with the base 24 shown in FIG.

[0069]

According to the first to fourth aspects of the present invention, by combining a light bulb formed with a visible light transmitting infrared reflecting film and a reflecting mirror, it is possible to reduce color unevenness on an irradiated surface and to achieve a light distribution characteristic. Further, it is possible to provide a halogen bulb with a reflecting mirror with improved luminous efficiency. Further, since the color unevenness on the irradiation surface is reduced, it is possible to perform suitable illumination as a light source for optical devices, OA devices, or homes and shops.

According to the fifth aspect of the present invention, by providing the base in which the terminal pins and the screws are screwed, it is possible to secure the electric connection with high electric insulation and hold the electric bulb.

According to the sixth aspect of the present invention, the same effect as in the first aspect can be obtained by making the bulb shape of the portion corresponding to the bottom of the reflecting mirror a curved surface.

According to the seventh aspect of the present invention, the bulb and the reflecting mirror can be integrated, and a portion which tends to have an undesired film thickness can be covered with an adhesive to shield light. Further, the corresponding position between the filament and the reflecting surface can be maintained for a long period of the life time.

According to the eighth aspect of the present invention, by covering the front surface of the reflecting mirror with a transparent cover, a lens or a prism, it is possible to improve or change light emission characteristics such as light distribution. Even if color unevenness occurs, it can be dispersed by the front cover to improve the visual quality. Also,
The reflection surface and the surface of the light bulb are prevented from being stained, thereby maintaining the light emission maintaining property and preventing the light bulb from being scattered in the event of a rupture of the light bulb.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of a light bulb with a reflector according to the present invention.

FIG. 2 is an enlarged cross-sectional view showing a part of a visible light transmitting infrared reflection film formed of a multilayer light interference film formed on a surface of a bulb.

FIG. 3 is a longitudinal sectional view showing another embodiment of the bulb with a reflecting mirror of the present invention.

FIG. 4 is an explanatory diagram showing a relationship between a halogen bulb having a red anti-reflection film formed thereon and a reflecting surface of a reflecting mirror.

FIG. 5 is a front view showing another embodiment of the light bulb with a reflecting mirror of the present invention.

FIG. 6 is a longitudinal sectional view showing an embodiment of a lighting device (lighting fixture) of the present invention.

FIG. 7 is a longitudinal sectional view showing a conventional bulb with a reflector.

[Explanation of symbols]

L1, L2: halogen bulb RL1, RL2, RL3: bulb with reflector (halogen bulb with reflector) 1: glass bulb 11: bulb part 24: base 3: crush sealing part 5: filament 6: visible light transmitting infrared ray reflection 6H: High refractive index layer 6L: Low refractive index layer 7: Reflector 71: Reflective surface 72: Neck 73: Opening 75: Second reflective surface (Small reflective surface ... Concave surface) 7A: Reflection surface forming virtual line 8: Selective transmission / reflection film (visible light reflection / infrared transmission film) 9: Lighting device (lighting device) 91: Device main body 92: Socket

Claims (10)

[Claims] 1. A bulb having a bulged portion formed in a curved surface, a sealing portion provided in connection with the bulged portion, a filament disposed substantially on a central axis of the bulb, and one end of the filament disposed on the filament. A light bulb that is connected and includes a lead wire embedded in the sealing portion at the other end, a sealing gas sealed in the bulb, and a visible light transmitting infrared reflection film formed on the bulging portion; A reflecting mirror including a reflecting surface formed in a concave curved surface and an opening provided at the bottom of the reflecting surface, the neck having a neck portion formed so that a part of the bulb bulge is disposed in the opening; A light bulb with a reflecting mirror, comprising: 2. A bulb having a sealing portion at an end, a filament disposed substantially on the central axis of the valve, a lead wire having one end connected to the filament and the other end embedded in the sealing portion, A bulb configured to include a sealed gas sealed in the bulb and a visible light transmitting infrared reflecting film formed on the surface of the bulb; and a reflecting surface formed on a concave curved surface and an opening provided on the bottom of the reflecting surface. A reflecting mirror having a second reflecting surface formed so as to gradually narrow the diameter of the opening, and having a neck portion on the second reflecting surface side, on which a part of the bulb on the sealing portion side of the light bulb is disposed; And a light bulb with a reflector. 3. A bulb having a bulged portion formed in a curved surface and a sealing portion provided in connection with the bulged portion, a filament disposed substantially on a central axis of the bulb, and one end of the filament disposed on the filament. A light bulb that is connected and includes a lead wire embedded in the sealing portion at the other end, a sealing gas sealed in the bulb, and a visible light transmitting infrared reflection film formed on the bulging portion; It has a reflecting surface formed on a concave curved surface and a second reflecting surface including an opening provided at the bottom of the reflecting surface, the opening having a gradually decreasing diameter, and a light bulb on the second reflecting surface side. A reflector having a neck portion on which a part of the bulging portion is disposed. 4. A bulb having a bulged portion formed in a curved surface and a sealing portion provided in connection with the bulged portion, a filament disposed substantially on a central axis of the bulb, and one end of the filament disposed on the filament. A light bulb that is connected and includes a lead wire embedded in the sealing portion at the other end, a sealing gas sealed in the bulb, and a visible light transmitting infrared reflection film formed on the bulging portion; When the light emitted from one end and the other end of the filament irradiates the opening end, including the opening provided at the bottom of the reflecting surface formed on the concave curved surface, the angle formed between each irradiation light beam and the bulb. A reflector having a neck portion on which a sealing portion is disposed so as to be at 45 to 135 degrees. 5. The reflection according to claim 1, further comprising a ceramic housing joined to a neck portion of the reflector, and a base attached to the housing. Light bulb with mirror. 6. The reflector according to claim 1, wherein a part of the bulging portion is formed of one of a sphere, a spheroid, a paraboloid of revolution, and an ellipsoid of revolution. Light bulb. 7. The light bulb with a reflecting mirror according to claim 1, wherein an adhesive is interposed between the sealing portion and the opening. 8. The bulb with a reflecting mirror according to claim 1, wherein a front cover is provided on the front of the reflecting mirror. 9. An apparatus main body; a socket disposed on the apparatus main body; and the reflector-equipped light bulb according to any one of claims 1 to 8 mounted on the socket. Lighting equipment. 10. A valve having a sealing portion at an end, a filament disposed substantially on the central axis of the valve, a lead wire having one end connected to the filament and the other end embedded in the sealing portion, A bulb configured to include a sealed gas sealed in the bulb, a visible light transmitting infrared reflection film formed on the surface of the bulb, and a base attached to the sealing portion; an appliance main body; provided on the appliance main body; A reflecting mirror including a reflecting surface formed in a concave curved surface and an opening provided at the bottom of the reflecting surface, and having a neck portion in which a part of the bulb on the sealing portion side of the bulb is disposed in the opening; A socket provided on the main body, to which a base of the light bulb is mounted.