JPH11167902A - Bulbs, bulbs with reflectors and lighting fixtures - Google Patents

Abstract

(57) Abstract: An object of the present invention is to provide a light bulb, a light bulb with a reflector, and a lighting fixture in which a filament can be accurately arranged on a bulb axis. The invention according to claim 1 comprises a filament 1; a substantially spheroidal portion 2d in which the filament is disposed substantially on the long axis and is formed so as to surround the filament; and a convex portion 2f inside. An exhaust pipe 2e connected to one end of the substantially spheroidal part 2d, a cylindrical part 2b formed at the other end of the substantially spheroidal part, and a sealing part 2a formed at one end of the cylindrical part
A translucent airtight container 2 having: an infrared reflecting film 3 formed on at least a main part of a substantially spheroidal portion of the translucent airtight container; one end electrically connected to the filament and having one end Are provided in close proximity to the convex portion of the exhaust pipe, and the other ends are provided with internal leads 4 and 5 provided in the sealing portion of the light-transmitting airtight container; and in the sealing portion of the light-transmitting airtight container. External lead wires 8 and 9 electrically connected to the internal lead wires and led out of the sealing portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light bulb having an infrared reflecting film, a light bulb with a reflector, and a lighting fixture.

[0002]

2. Description of the Related Art Conventionally, this kind of bulb is disclosed in Japanese Patent Laid-Open No. 4-476.
No. 60 (conventional example 1). This light bulb has a filament and a glass bulb in which the filament is disposed inside, a portion where the filament is present is formed in a spheroid, and a portion where no filament is present is formed in a cylindrical shape connected to the spheroid, An infrared reflective film formed on the surface of the spheroid of the bulb. The filament is disposed between two focal points of the spheroid.

[0003] According to this, when the bulb is turned on, infrared rays emitted from the filament are reflected by the infrared reflecting film and are reflected on the filament.
Return to the filament arranged between the two focal points,
The filament can be efficiently heated, and the luminous efficiency (lm / W) can be improved.

FIG. 1 of JP-A-57-38557 (conventional example 2) shows that an exhaust pipe is formed at the tip of a cylindrical valve which is not a spheroid but has one end inside the exhaust pipe. Discloses an electric bulb in which an internal lead wire formed in a substantially U-shape is arranged, but its operation and effect are not disclosed at all.

[0005]

However, in the bulb of the conventional light bulb of the first example, the portion where the spheroid is formed and the infrared reflection film is formed is only the portion where the filament exists, and therefore this portion is not used. In addition, the infrared rays radiated do not return to the filament and do not contribute to the improvement of the luminous efficiency.

That is, the portion of the bulb where no filament is present has a cylindrical shape, and furthermore, since no infrared reflection film is formed, infrared light is transmitted through this portion and is radiated to the outside to emit light. The efficiency cannot be improved.

In the case where an infrared reflecting film is formed on a bulb partially formed in a spheroid to efficiently return infrared rays radiated from the filament to the filament, the filament is positioned on the major axis of the spheroid. The precise positioning is also a major issue in improving the luminous efficiency.

Therefore, in order to accurately arrange the filament on the valve shaft, it is necessary to accurately insert one end of an internal lead wire connected to the filament into the exhaust pipe. For this purpose, it is necessary not only to improve the assembling accuracy of the mount constituted by the filament and the internal lead wire connected thereto, but also to precisely connect the exhaust pipe to the valve.

Then, for example, immediately after connecting the exhaust pipe to the valve, a pin having a predetermined diameter may be inserted into the connection portion to make the inner diameter uniform. This is because the inner diameter of the exhaust pipe varies most at the connection portion. If necessary, the length of the portion where the pin is inserted may be determined, and if necessary, the valve or the exhaust pipe can be heated at the time of insertion. Generally, as shown in FIG.
In many cases, 62 g is drooped inside. On the other hand, in the case of manufacturing a light bulb, the mount is temporarily fixed to a carrier machine, and sealing is performed after the mount is covered with a bulb having a chucked exhaust pipe. From this, it is important that the center axis of the mount and the center of the valve axis substantially coincide with each other, and that the resistance between the insertion portion and the inner wall of the exhaust pipe is small.

Therefore, in order to ensure uniformity of the inner diameter of the exhaust pipe, it is necessary to reconnect the exhaust pipe before one end of the internal lead wire or to correct the center axis. An object of the present invention is to provide a bulb, a reflector-equipped bulb, and a lighting fixture in which a filament can be accurately arranged on a bulb shaft.

[0011]

According to the first aspect of the present invention, there is provided a filament; and a substantially spheroidal portion in which the filament is disposed substantially on the long axis and is formed so as to surround the filament. An exhaust pipe connected to one end of the substantially spheroidal portion, a cylindrical portion formed at the other end of the substantially spheroidal portion, and a sealing portion formed at one end of the cylindrical portion. A light-transmitting airtight container; an infrared reflective film formed on at least a main part of a substantially spheroidal portion of the light-transmitting airtight container; An internal lead wire having a locking portion disposed in the vicinity of the shape portion and having the other end disposed in the sealing portion of the light-transmitting hermetic container; An external lead wire electrically connected to the lead wire and led out of the sealing portion; It is characterized in Rukoto.

A second aspect of the present invention is a filament; a substantially spheroidal portion formed so that the filament is disposed substantially on the long axis and surrounds the filament; An exhaust pipe sealed near the convex portion and having the other end connected to one end of the substantially spheroidal portion, a cylindrical portion formed at the other end of the substantially spheroidal portion, and one end of the cylindrical portion. A light-transmitting airtight container having a sealed portion; an infrared reflective film formed on at least a main portion of a substantially spheroidal portion of the light-transmitting airtight container; And a locking portion disposed in the exhaust pipe near the convex portion sealed in one end direction, and the other end is provided with an internal lead wire disposed in the sealing portion of the translucent airtight container. ; Electrically connected to the internal lead wire in the sealing portion of the light-transmitting airtight container, and from the sealing portion. Characterized in that it comprises a; and the external lead wire is derived.

According to a third aspect of the present invention, in the light bulb according to the first or second aspect, a reduced-diameter portion is formed between the substantially spheroidal portion and the cylindrical portion, and the reduced-diameter portion is used as a boundary to substantially rotate. The volume of the ellipsoid is about 7 to about 9 times the volume of the cylinder.

According to a fourth aspect of the present invention, in the light bulb according to the first or second aspect, the filament end face and the internal lead wire are fixed by welding.

According to a fifth aspect of the present invention, in the light bulb according to the fourth aspect, the welded portion is formed of tungsten or a tungsten alloy.

According to a sixth aspect of the present invention, there is provided a light bulb according to any one of the first to fifth aspects, and a reflector disposed optically opposite to the light bulb.

According to a seventh aspect of the present invention, there is provided a light bulb according to any one of the first to fifth aspects, and a reflector having a neck portion, a reflector having a reflection curved surface optically opposed to the light bulb; And a light-shielding film formed on the inner surface of the light-emitting device.

According to an eighth aspect of the present invention, there is provided an apparatus main body; and a light bulb with a reflecting mirror according to any one of the fifth or seventh aspect, provided on the apparatus main body.

In each of the above-mentioned inventions, the material of the light-transmitting airtight container may be any material having fire resistance, and quartz glass, ceramics and the like can be used.

The reduced diameter portion is a portion whose outer diameter is smaller than the outer diameter of the cylindrical portion and is connected to the cylindrical portion, and the inner diameter is a portion through which an assembly with the filament and the internal lead wire is inserted. The size may be as large as possible. In addition, since the diameter of the cylindrical portion is larger than that of the reduced diameter portion, it is possible to suppress electrical contact between the internal lead wires of the assembly, particularly during mass production.

The substantially spheroidal part is a part of a spheroid obtained by rotating an ellipse having a short axis and a long axis about a long axis. Then, one that approximates a spheroid is also allowed.

The infrared reflecting film may be any film as long as it can return the infrared rays emitted from the filament to the filament. For example, the infrared reflecting film is formed by alternately stacking a low refractive index layer and a high refractive index layer. There is an interference film. The light interference film refers to a film that transmits or reflects light in a specific wavelength region using light interference. The material of the low refractive index layer is, for example, silicon oxide (SiO2) or magnesium fluoride (MgF2), and the material of the high refractive index layer is, for example, titanium oxide (TiO2), tantalum oxide (Ta2O5), zirconium oxide (ZrO2). ), Zinc sulfide (ZnS), tin oxide (SnO2) and the like.

The material of the inner and outer lead wires can supply electric power to the filament, and a molybdenum wire is used for a light bulb from the viewpoint of heat resistance and the like.

The locking portion is formed by molding a part of the internal lead wire, and is a portion which is in contact with the inside of the exhaust pipe, and its shape is arbitrary.

[0025]

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 side view of a light bulb showing a first embodiment of the present invention, FIG.
FIG. 3 is a side view of the same.

In FIG. 1, reference numeral 1 denotes a filament, which has a multi-coil portion 1a and leg portions 1c, 1c formed at both ends of the multi-coil portion 1a via intermediate portions 1b, 1b. The multiple coil portion 1a of the filament 1
The spheroidal portion 2d has a length substantially spanning the first focal point F1 and the second focal point F2, and the end of the multiple coil portion 1a is disposed on or near the focal points F1 and F2. It is supposed to be.

Reference numeral 2 denotes a light-transmitting airtight container, for example, a quartz glass bulb. The central axis of the multiple coil unit 1a is disposed substantially on the long axis, and the multiple coil unit 1a
Spheroidal portion 2d formed so as to surround the spheroidal portion, a reduced-diameter portion 2c connected to one end of the approximately spheroidal portion 2d, and one end connected to the reduced-diameter portion 2c and having a diameter larger than the reduced-diameter portion 2c. A large cylindrical portion 2b, an exhaust pipe 2e connected to the other end of the sealing portion 2a formed at the other end of the cylindrical portion 2b and the other end of the substantially spheroidal portion 2d, and having a convex portion 2f formed therein. And the angle θ from the vicinity of the end 1d on the reduced diameter portion 2c side of the multiple coil portion 1a to the outer surface of the reduced diameter portion 2c is 170 ° or less. For example, θ = 90 °. Convex part 2
f is a joint of the exhaust pipe 2e, and a part of the substantially spheroid is extended up to this joint to constitute a part of the exhaust pipe 2e.

Therefore, since the major axis of the substantially spheroidal portion 2d does not deviate from the axis of the exhaust pipe 2e, when the filament 1 is disposed inside the substantially spheroidal portion 2d by inserting one end of the internal lead wire, It is disposed substantially on the axis of the substantially spheroidal portion 2d.

Here, the angle θ considering the outer surface of the reduced diameter portion
The term “angle” means an angle surrounded by a line passing through the outer surface of the reduced-diameter portion around the vicinity of the end on the reduced-diameter portion side of the multiple coil portion. As a measuring method, when two lines are drawn on the projection surface of the bulb obtained by enlarging the side surface of the bulb with the magnifying projector and passing through the outer surface of the reduced diameter portion around the vicinity of the reduced diameter portion side end, The angle obtained. When θ> 170 °, the substantially spheroidal portion cannot be formed up to the reduced diameter portion or the like, and the multiple coil portion cannot be surrounded. The preferable range is 50 ° ≦ θ ≦ 90 ° from the viewpoint that the luminous efficiency is remarkably improved and the ease of inserting the assembly of the filament and the internal lead wire into the light-transmitting airtight container in the manufacturing process. .

According to FIG. 3, a reduced diameter portion is formed between the substantially spheroidal portion and the cylindrical portion, and the volume A of the substantially spheroidal portion 2d is limited by the reduced diameter portion as a boundary. It is configured to be about 7 to about 9 times the volume B of the portion 2b. Also, the inner diameter of the reduced diameter portion 2c, which is the joint between the substantially spheroidal body portion 2d and the cylindrical portion 2b, is 8 to 9 mm, the maximum diameter of the substantially spheroidal body portion 2d is 13 to 15 mm, and the light emitting portion length of the filament 1 is 8 to 9 mm. 11 mm.

That is, if the volume ratio of the substantially spheroidal portion 2d to the cylindrical portion 2b is small, the convection of the gas sealed in the glass bulb 2 at the time of lighting the bulb is hindered, and the cylindrical portion 2b
When the halogen gas is condensed, the internal leads are excessively etched and become brittle. As a result, there is a problem such as an inability to secure an appropriate life.
Condensation of halogen gas in b is suppressed,
The life of the bulb can be ensured.

When the volume ratio of the substantially spheroidal portion 2d to the cylindrical portion 2b is large, that is, when the substantially spheroidal portion 2d is large, the entire bulb becomes large and it is difficult to reduce the size of the bulb. Since the temperature tends to decrease, the function of the halogen cycle decreases, and it becomes difficult to secure the life due to blackening or the like. In addition, when the cylindrical portion 2b is small, it is difficult to insert and arrange a filament structure in which a filament, an internal lead wire, and a glass bead are integrally formed in a translucent airtight container, which is not suitable for mass production. It becomes.

Further, an infrared reflecting film 3 is formed on the surface of the substantially spheroidal portion 2d. The infrared reflection film 3 includes, for example, a high refractive index layer made of tantalum oxide (Ta2O5),
A low refractive index layer made of silicon oxide (SiO2) is alternately formed as a multilayer film of, for example, a total of 9 to 50 layers. Such an infrared reflecting film 3 reflects infrared light by a light interference effect and emits visible light. Through.

More specifically, the infrared reflective film 3 is a first laminate of the following seven layers defined by the cut wavelength λ1 on the surface of the translucent airtight container 2, and the following laminated layer defined by the cut wavelength λ2. It is composed of a second laminate in which seven layers are laminated for at least two periods and a third laminate composed of a short-wavelength-passing laminate formed thereon.

Here, each of the seven layers of the first and second laminates has, for example, an optical film thickness of L / a, H / b, L / c,
H / d, L / c, H / b, L / a (2 ≦ a ≦ 4, 5 ≦ b ≦ 15, 5 ≦ c ≦ 1
5, 1 ≦ d ≦ 2.5). Further, L and H are respectively 1 / the wavelength of the laminate of the low refractive index material and the high refractive index material.
Represents an optical thickness equal to 4 and the wavelength of the laminate is defined by the value at which the reflectivity is maximized. When this infrared reflective film 3 is used, the filament color temperature at the time of rated lighting is about
2700K (Kelvin) or more, while maintaining the film properties,
A method for reducing the coating unit price can be provided. In particular, when the color temperature is 2700 K or higher, the ratio of the long-wavelength-side infrared radiant flux to the total radiant flux is reduced, so that the long-wavelength-side infrared reflection characteristic is not so important.

Further, the first internal lead wire 4 is connected to the leg portion 1c, which is one end of the filament 1, and the locking portions 4a and 4b formed by molding a part thereof are connected to the inside of the exhaust pipe 2e. It is arranged close to the convex portion 2f. Further, the second internal lead wire 5 is connected to a leg portion 1 c which is the other end of the filament 1. These first and second internal lead wires 4 and 5 are held by glass beads 6, and the glass beads 6 are connected to the cylindrical portion 2b of the light-transmitting airtight container 2.
It is arranged in. The filament 1 and the inner lead wire are fixed by welding the ends of the leg portions 1c, 1c of the filament 1 and one end of the inner lead wires 4, 5.
The weld 1d is formed of tungsten or a tungsten alloy. According to this, the leg portion 1 of the filament 1
The movement of c and 1c is suppressed, the movement of the filament 1 can be suppressed, and the positioning can be reliably performed in the substantially spheroidal portion 2d.

The ring-shaped second locking portion 4b has a ring outer diameter d4 of 1.5 mm ≦
It is preferable that d4 ≦ 2.5 mm. The ring-shaped second locking portion 4b is preferably in contact with the inner surface of the exhaust pipe 2e, but may have a slight gap in order to reduce resistance when inserted into the exhaust pipe 2e. Good, but it is better to have as little gap as possible.

Furthermore, the other ends of the first and second internal lead wires 4 and 5 are connected to metal foils 7 and 7, for example, a molybdenum foil disposed in the sealing portion 2a. In the valve 2,. Halogen gas is sealed. Further, external lead wires 8, 9 led out of the translucent airtight container 2 are connected to the metal foils 7, 7.

A ceramic insulating base 10 is mounted on the sealing portion 2a of the translucent airtight container 2, and the insulating base 10 is joined to the sealing portion 2a by an adhesive 11. The insulating base 10 is provided with an electric connection means 12, for example, a screw-type base having electric connection portions 12a and 12b.
Are connected to the electrical connection portions 12a and 12b, respectively.

In the present embodiment, the maximum outer diameter of the substantially spheroidal portion 2 d of the light-transmitting airtight container 2 is D, and the cylindrical portion 2 d is
When the inner diameter of b is d1 and the inner diameter of the exhaust pipe 2e is d2, d
1 ≦ d2 and D ≧ 1.5d1 are satisfied. When the inner diameter of the exhaust pipe 2e is d2 and the outer diameter of the first internal lead is d3, 2.5 mm ≦ d2 ≦ 6.0 mm, 0.2 mm ≦ d3
≤ 0.35 mm is satisfied.

Next, a second embodiment of the present invention will be described with reference to the drawings.

FIG. 4 is a side view of a light bulb showing a second embodiment of the present invention. In the present embodiment, the same components as those of the light bulb of the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, in the exhaust pipe 2e connected to one end of the substantially spheroidal portion 2d, the convex portion 2
However, since the projection 2f is sealed in the vicinity 2g of the projection 2f, the projection 2f is difficult to be clearly distinguished. A locking portion 4a for the internal lead wire 4 is provided in the exhaust pipe 2e near the sealed convex portion 2g. According to this, the exhaust pipe is sealed at a portion where the pipe inner diameter is relatively small near the convex portion 2f and 2g, so that the sealing is easy. That is, when sealing off the exhaust pipe,
If the temperature of the burner is too high, the spheroidal portion 2d tends to be deformed.
As a result, the exhaust pipe can be sealed off before the substantially spheroidal portion 2d is deformed.

FIG. 5 is a partial cross-sectional side view of a bulb with a reflector according to a third embodiment of the present invention. In the figure,
Reference numeral 13 denotes a reflector, and a light bulb is disposed inside the reflector. This light bulb is obtained by removing the insulating base 10 from the light bulb described in the first embodiment of the present invention, and has the same other configuration.

First, the reflector 13 is formed by forming a reflection surface 13b on the inner surface of a base 13a having an opening having an enlarged front surface and a neck portion in a direction facing the opening. A front glass 14 is mounted on the opening, and a ceramic insulating base 15 is mounted on the neck 13c.

The insulating base 15 has an electrical connection 1
A threaded base 16 having 6a, 16b is mounted, and the external leads 8, 9 of the bulb are connected to the electrical connection 16
a, 16b. Further, a light shielding film 13d is formed on the inner surface of the neck portion 13c.
This light-shielding film 13d is formed of a heat-resistant reflective film having a reflectance of 10% or more. Heat-resistant materials include metal or SiO
2 or Al2O3 as a main component. This light shielding film 13
By d, light leakage from this part can be reduced,
Unnecessary light distribution can be suppressed.

The adhesive used to bond the reflector 13 and the bulb fills up to 70% or less of the space area between the reflector and the bulb in a horizontal cross section, thereby increasing the light use efficiency of the reflector. I have. As a means for that, the neck part 1
The inner diameter of 3c is defined as above, and a part of the visible light radiated in the direction of the bulb end, which has been absorbed without being reused in the past, is returned to the reflector 13 by the reflective heat-resistant material, thereby improving the irradiation efficiency. Increase.

The use of light by a mirror was investigated by a ray tracing method for a halogen bulb having a long filament length of about 100 V, and the effective use portion was about 1/3 of the total length of the filament central portion. It turns out that there is only a part of the degree. As a result, by effectively reflecting visible light that has been conventionally emitted to the rear of the bulb and absorbed or transmitted to other members without being reused, and without complicating the manufacturing process, a reflector is provided. It is possible to increase the luminous flux radiated forward from 13.

Further, the infrared rays are returned to the translucent airtight container 2 by the infrared reflecting film 3, so that the infrared rays do not reach the reflector 13 and the temperature rise of the reflector 13 is suppressed, and the infrared ray is visible to the irradiating object which dislikes the infrared rays. It is effective for irradiating light.

FIG. 6 is a perspective view of a lighting fixture according to a fourth embodiment of the present invention. In the figure, the lighting fixture is composed of a fixture main body 17 and a bulb 18 with a reflecting mirror disposed on the fixture main body 17. According to this, the infrared light is returned to the translucent airtight container by the infrared reflection film, so that it does not reach the reflector, the temperature rise of the reflector and the instrument body is suppressed, and visible light is irradiated to the irradiation object that dislikes the infrared light. It is effective for irradiation.

[0052]

According to the first aspect of the present invention, since the long axis of the light-transmitting airtight container and the axis of the exhaust pipe are substantially coincident with each other, the inner lead wire is provided at one end so that the filament can be accurately transmitted. Since it can be arranged on the axis of the light-tight container and the infrared rays radiated from the filament can be efficiently returned to the filament, the luminous efficiency is improved.

According to the second aspect of the invention, in addition to the effect of the first aspect, the exhaust pipe is sealed at a portion where the inner diameter of the pipe is relatively narrow due to the convex portion of the exhaust pipe. Cheap.

According to the third aspect of the invention, in addition to the effect of the first aspect of the present invention, it is possible to suppress the halogen gas from condensing in the cylindrical portion, and it is possible to secure the life of the bulb.

According to the fourth aspect of the present invention, in addition to the effect of the first aspect of the present invention, since the end face of the filament and the internal lead wire are fixed by welding, it can be easily arranged on the axis of the light-transmitting airtight container.

According to the fifth aspect of the present invention, in addition to the effect of the first aspect of the invention, since the welded portion is formed of tungsten or a tungsten alloy, the strength is improved.

According to the sixth aspect of the present invention, it is possible to provide a light bulb with a reflector having improved luminous efficiency.

According to the invention of claim 7, in addition to the effect of the invention of claim 6, it is possible to obtain a bulb with a reflector having excellent light distribution characteristics.

According to the eighth aspect of the present invention, it is possible to provide a lighting fixture with improved luminous efficiency.

[Brief description of the drawings]

FIG. 1 is a side view of a light bulb showing a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a main part of the valve.

FIG. 3 is a side view of the same.

FIG. 4 is a side view of a light bulb showing a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional side view of a light bulb with a reflector according to a third embodiment of the present invention.

FIG. 6 is a perspective view of a lighting fixture showing a fourth embodiment of the present invention.

FIG. 7 is a longitudinal sectional view of a main part of a conventional valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Filament 1a ... Multiple coil part 1b ... Intermediate part 1c ... Leg part 1d ... End part 2 ... Translucent airtight container 2a ... Sealing part 2b ... Cylindrical part 2c ... Reduced diameter part 2d ... Substantially spheroidal part 2e ... Exhaust pipe 3 ... Infrared reflective film 4 ... First internal lead wire 4a, 4b ... Locking part 5 ... Second internal lead wire 6 ... Glass beads 7 ... Metal foil 8, 9 ... External lead wire 12 ... Electrical connection means

Claims (8)

[Claims] A filament having a substantially spheroidal portion disposed substantially on the long axis and formed so as to surround the filament; a filament having a convex portion therein; A light-transmitting airtight container having an exhaust pipe connected to one end, a cylindrical portion formed at the other end of the substantially spheroidal portion, and a sealing portion formed at one end of the cylindrical portion; An infrared reflective film formed on at least a main portion of a substantially spheroidal portion of the airtight container; a member electrically connected to the filament and disposed in one end direction near the convex portion of the exhaust pipe. An internal lead wire having a stop portion and the other end disposed in the sealing portion of the light-transmitting airtight container; and being electrically connected to the internal lead wire in the sealing portion of the light-transmitting airtight container, and sealed. An external lead led out of the part. 2. A filament, wherein the filament is disposed substantially on the major axis and is formed to surround the filament, and has a substantially spheroidal shape, a convex portion inside, and one end near the convex portion. An exhaust pipe sealed at the other end and connected to one end of the substantially spheroidal portion, a cylindrical portion formed at the other end of the substantially spheroidal portion, and a sealing portion formed at one end of the cylindrical portion A light-transmitting airtight container having: a light-transmitting airtight container; an infrared reflecting film formed on at least a main part of a substantially spheroidal portion of the light-transmitting airtight container; An inner lead wire having a locking portion disposed in the exhaust pipe near the convex portion sealed at the other end, and the other end disposed at the sealing portion of the translucent airtight container; The outside that is electrically connected to the internal lead wire inside the sealed part of the container and led out from the sealed part Bulb, characterized in that it comprises a; lead wire and. 3. A reduced diameter portion is formed between the substantially spheroidal body portion and the cylindrical portion. With the reduced diameter portion as a boundary, the volume of the substantially spheroidal portion is about 7 to about the volume of the cylindrical portion. 3. The light bulb according to claim 1, wherein the power is nine times. 4. The filament end face and the inner lead wire are fixed by welding.
The described light bulb. 5. The electric bulb according to claim 4, wherein the weld is formed of tungsten or a tungsten alloy. 6. A light bulb with a reflector, comprising: the light bulb according to any one of claims 1 to 5; and a reflector optically opposed to the light bulb. 7. A light bulb according to any one of claims 1 to 5, and a reflector having a neck portion and having a reflection curved surface optically opposed to the light bulb; and a reflector formed on an inner surface of the neck portion. And a light-shielding film. 8. A lighting apparatus comprising: an apparatus main body; and the light bulb with a reflecting mirror according to claim 5 disposed on the apparatus main body.