JPH10241639A - Bulb, bulb with reflecting mirror, and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent light emission efficiency from being lowered, even in the case of filler gas pressure lowering by providing a lead wire with the one end connected to a filament while the other end being embedded in a seal part, filler gas in a bulb of a specific pressure or less at an ordinary temperature, and a visible light infrared reflecting film arranged at a swollen part of the bulb. SOLUTION: A bulb 1 is formed of quartz glass and forms a crush seal part 3 of metallic foil 21, 21 that constitute a part of a lead-in conductor 2. The bulb 1 is formed into a smooth continuous face shape, without the abrupt change in its outline, with the difference between a straight part and the maximum outer diameter of a swollen part set to 1.4 times or less, so as to uniformize the film thickness of a visible light transmitting infrared-reflecting film 6. Accordingly, even if a thermal shock caused by blinking of the bulb is received, its stress is equal, and cracking and separation of the visible light- transmitting infrared reflecting film 6 are prevented. The pressure of an inert gas filled in the bulb 1 is set to 2.02×10<5> Pa or less, so as to step down by 40% in comparison to a conventional bulb with respect to a pressure rise of 3-7×10<5> Pa in lighting, thereby preventing breaking of the bulb 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bulb provided with a visible-light-transmitting infrared-reflective film for preventing a bulb from bursting and improving safety, and a lighting apparatus equipped with the bulb.

[0002]

2. Description of the Related Art Halogen light bulbs have recently been widely used in homes and stores for downlights and spotlights because of their small size and high efficiency. This halogen lamp uses a halogen circulation cycle in which tungsten evaporated from the filament is sealed in the bulb, returns the filament to the filament, prevents blackening of the bulb, increases efficiency, and extends the life. The halogen bulb is designed in a small tube shape so that the temperature of the glass bulb becomes 250 ° C. or higher in order to smoothly carry out the halogen cycle, and the pressure of the inert gas sealed in order to increase the efficiency is also 3. The pressure is increased to 0 × 10 ^{5 to} 7.0 × 10 ⁵ Pa (Pascal).

In order to cope with such high temperature, high pressure and corrosion resistance, hard glass such as quartz glass or alumina silicate glass is used as a valve material. However, even if the glass is strong against these conditions, if the bulb surface has scratches or strong residual distortion due to thermal processing, the cracks caused by the scratches and the like will grow due to the internal pressure increased when the bulb is turned on. It occurs in the bulb, the bulb ruptures, the glass shards scatter around and injure yourself,
There is a risk that the displayed products may be damaged.

[0004] Therefore, as means for preventing scattering of glass fragments due to the rupture of the bulb, a synthetic resin film is formed on the outer surface of the bulb of the bulb, the outside of the bulb of the bulb is surrounded by a mesh, a PAR type, or the like. The bulb is housed in the outer bulb to make it a double tube configuration and a light-transmitting cover is provided on the front of the lighting equipment of the bulb, and such correspondence is standardized. In some countries.

However, the formation of a synthetic resin film on the outer surface of the bulb does not have heat resistance in a lamp having a high temperature, such as a halogen bulb, and enclosing it with a mesh blocks light emission as a result of shielding light emission by the mesh. In some cases, the efficiency is reduced, and the small pieces of glass cannot be completely prevented, or the temperature of the sealing portion metal foil rises above an allowable value. In addition, when the double tube is used, the structure is complicated and the cost is high, the luminous efficiency is reduced, and the outer bulb may be broken by the flying glass piece, and further, a cover is provided on the front of the instrument. This raises the problem that the cost increases and the luminous efficiency decreases.

Further, the rupture of the glass bulb may be caused not only by the scratch on the surface of the bulb, but also by an arc discharge generated in a gap between the broken lines when the filament is broken. This is because when the filament breaks, a part of the filament and the internal lead wire are melted and scattered by the arc discharge, and the red hot high-temperature ingot gives a thermal shock to the inner surface of the glass bulb that collided, resulting in cracks. The phenomenon of not only cracking but also bursting of the valve may be caused.

[0007] Even if an arc discharge due to this electrical factor occurs, if the electric circuit is immediately cut off, the arc discharge does not continue. Therefore, a part of the lead wire supporting the filament and making an electrical connection, generally, This is addressed by providing a current fuse on part of the external lead wire. However, conventional current fuses have a wide allowable range for overcurrent, and when the filament breaks, the arc discharge continues and melts and scatters even to filament holding members such as filaments and lead wires. Even within the base, there is a problem that an arc is generated due to the blowing of the fuse, and the molten mass of the fuse breaks a shell portion or an insulating portion of the base and welds to the socket, thereby making it difficult to separate from the socket.

In view of the above, considering firstly the safety point of preventing the explosion of the bulb, as described in, for example, JP-A-56-67161,
It is conceivable that the pressure of the inert gas sealed in the valve may be reduced. And in this publication,
If the pressure of the inert gas is excessively lowered (about 133 Pa or less (normal temperature)), the arc voltage is reduced, the arc is easily generated, and the life is shortened.
00 Torr (2.7 × 10 ^{4 to} 6.7 × 10 ⁴ Pa)
(Room temperature) is considered good. However, since the sealing pressure is low, the luminous efficiency tends to decrease.

As described above, the efficiency can be increased by increasing the filling pressure of the inert gas. However, the risk of valve breakage increases, and the higher the pressure is, the more the inert gas is easily ionized. As in the case of lowering the pressure, the arc is easily generated. In addition, high-pressure encapsulation has a problem that it is difficult to seal the exhaust pipe, and the operation is troublesome, such as cooling and encapsulating the gas.

[0010] As described above, the halogen bulb is of a straight cylindrical shape as a result of miniaturizing the bulb in order to smoothly perform the halogen cycle. However, in order to further improve the pressure resistance, the halogen bulb is used. It is conceivable that the bulb shape is an oval such as a sphere or an ellipse.

However, providing the bulb with a bulged portion such as a sphere or an ellipse increases the size of the lamp and the size of the lighting equipment as compared with the case where a straight cylindrical bulb is used, and deteriorates the light emission characteristics. There is a fear.

On the other hand, in the field of light bulbs, various devices have been devised as a part of energy saving. For example, in the case of halogen light bulbs, light is radiated from a filament by forming a visible light transmitting infrared reflecting film on the surface of the bulb. It is known that infrared rays are reflected by the reflective film and returned to the filament, thereby heating the filament and increasing the luminous efficiency.

In particular, in the halogen bulb having the visible light transmitting infrared reflecting film formed thereon, the temperature of the bulb surface is further increased due to the infrared reflecting film as compared with the halogen bulb without the infrared reflecting film, and there is a risk of bulb breakage. There is a problem of growing. When the properties of the infrared reflecting film are improved, power can be saved accordingly, and the calorific value of the filament can be reduced.On the other hand, since the infrared reflecting film is provided, the temperature rise of the valve surface is further increased, and as a result, The bulb temperature is at the same level as a bulb without an infrared reflective film.

Therefore, the halogen lamp having the infrared reflective film is different from the halogen lamp without the reflective film in the conditions for preventing the arc discharge phenomenon and the breakage of the bulb which occur when the filament is broken. Specific condition settings are required. In particular, halogen bulbs with infrared reflective coatings have a higher surface temperature than bulbs without reflective coatings. In order to exhibit the above phenomenon, the distribution and duration of the arc vary accordingly, and as a result, it is necessary to provide a dedicated fuse.

[0015]

SUMMARY OF THE INVENTION The present invention does not reduce the luminous efficiency even when the filling gas pressure is set relatively low, and suppresses the arc generation at the time of filament disconnection to prevent the breakage of the bulb and the base. It is an object of the present invention to provide a light bulb, a light bulb with a reflecting mirror, and a lighting device that can be prevented.

[0016]

According to a first aspect of the present invention, there is provided a light bulb having a sealing portion, a straight portion formed continuously with the sealing portion, and an outer diameter of the straight portion. A bulb having a bulge formed into a curved surface so as to have an outer diameter of four times or less, a filament disposed substantially on the central axis of the bulb, and one end connected to the filament and the other end connected to the filament. A lead wire embedded in the sealing portion and 2.02 × 10 ⁵ at room temperature
It is characterized by comprising a sealed gas sealed in the bulb so as to be Pa or less, and a visible light transmitting infrared reflecting film formed at least on a bulging portion of the bulb.

When the bulb is turned on, the pressure of the inert gas in the bulb, which is increased two to three times, is reduced by about 20% as compared with the conventional bulb,
The valve can be reliably prevented from bursting. The lower limit of the inert gas filling pressure (at room temperature: 25 ° C.) is 0.6.
It is sufficient that the pressure is 7 × 10 ⁵ Pa. If the pressure is lower than 0.67 × 10 ⁵ Pa, the arc voltage is undesirably lowered. The preferable filling pressure of the inert gas is 0.8 × 10 ⁵ -1.
At 6 × 10 ⁵ Pa, if it is within this range, it is possible to obtain a bulb having excellent arc voltage, light-emitting characteristics and life characteristics and without bursting of the bulb.

Further, the shape of the valve is such that the difference between the straight portion of the valve and the maximum outer diameter of the bulging portion is 1.4 times or less, and the straight portion and the curved portion are connected to each other to form a sharp external shape ( By eliminating the change in outer diameter, a smooth continuous surface is formed, and the thickness of the visible light transmitting infrared reflecting film formed on the valve surface is made uniform. Incidentally, the straight portion of the valve in the present invention,
When the glass tube is in the state (outer diameter) before sealing, etc., it is difficult to qualify the straight part after processing the glass tube by sealing or bulging work. A portion having the smallest outer diameter of the valve, such as between the stop portion and the bulging portion.

Even if the coating is subjected to a thermal shock due to the flickering of the electric bulb, the stress is equalized by the uniformization of the film thickness, and the occurrence of local cracking and peeling of the coating can be prevented. Further, the formation of the visible light transmitting infrared reflecting film is not limited to the outer surface of the bulb, but may be on the inner surface of the bulb or on both inner and outer surfaces.

The light bulb to which the present invention is applied is not limited to a light-emitting halogen light bulb, but may be a light bulb for other uses. Further, the sealing portion formed on the bulb is not limited to one end. May be provided at both ends. Further, the sealing portion is not limited to the crushing sealing portion, and may be a sealing portion formed by contracting a valve. Further, the sealing portion is not limited to a metal foil such as a molybdenum foil, and may use a linear sealing member. You may.

The bulb according to the second aspect of the present invention is characterized in that a part of the bulging portion is formed of any one of a sphere, a spheroid, a paraboloid of revolution, and an ellipsoid of revolution.

[0022] By adopting such a shape, the straight portion and the bulging portion of the valve can be smoothly connected to each other, so that the same effect as described in the first aspect is exerted.

According to a third aspect of the present invention, there is provided a light bulb, wherein a second straight portion is formed in the middle of the bulging portion.

Even if a straight portion is continuously provided in the middle of the bulging portion of the valve, the continuous portion between the straight portion and the bulging portion forms a smooth continuous surface. It has the same effect as described.

According to a fourth aspect of the present invention, there is provided a bulb, a filament disposed substantially on a central axis of the bulb, and one end connected to the filament and the other end embedded in the sealing portion. And a fuse wire which is provided electrically connected to the lead wire and which is blown in a time within 1/2 of a commercial power supply frequency cycle when an overcurrent occurs in the filament; 3-7x
It is characterized by comprising a filling gas sealed in the bulb so that the pressure becomes 10 ⁵ Pa, and a visible light transmitting infrared reflecting film formed on the surface of the bulb.

If the pressure of the filled gas is less than 3 × 10 ⁵ Pa due to a rise in temperature when the bulb is turned on, the sublimation of the filament is fast due to the small amount of inert gas, and the light emission characteristics (luminous flux) are reduced. Also, the life characteristics are short. Further, as described above, when the filling pressure of the inert gas is low, not only the arc voltage is reduced and the life is shortened, but also the arc continues, the filament and the lead wire are easily melted, and the valve is easily cracked.

If the pressure of the filled gas exceeds 7 × 10 ⁵ Pa with an increase in temperature, the valve may burst due to an increase in the internal pressure of the valve.

The time required to blow these fuse lines is within 1/2 of the frequency of the commercial power supply (for example, within about 10 msec at 50 Hz, and about 8.times. At 60 Hz).
If the fusing could be performed within a short time (within 4 msec), the burst of the bulb could be prevented without dragging the arc.

The location where the fuse wire of the introduction conductor is provided may be the portion of the internal lead wire or the portion of the external lead wire, that is, any portion which does not hinder the holding of the filament or the connection with other conductive members. I just need. In addition, the formation of the fuse line may be performed on one or both of the pair of lead conductors. The shape of the valve may be a straight, substantially cylindrical shape, or a shape having a straight portion, a spherical or circular bulge.

According to a fifth aspect of the present invention, there is provided a bulb, a filament disposed substantially on a central axis of the bulb, and one end connected to the filament and the other end embedded in the sealing portion. And a fuse wire formed with a wire diameter of 0.08 to 0.18 mm and having a length of 10 to 100 times the wire diameter, and a fuse wire diameter of 1 to 100 times the wire diameter.
A fuse structure composed of external lead wires mainly composed of nickel and having a wire diameter of 2 to 2.5 times and connected to both ends of the fuse wire, and a pressure of 2.02 × 10 ⁵ Pa or less at room temperature. And a visible light transmitting infrared reflecting film formed on the surface of the bulb.

An external lead wire composed of two to four parts with a fuse wire interposed is used, and when an overcurrent flows, the fuse wire melts within a predetermined time to cut off the circuit. Thus, the same operation as the above-described claim 4 is achieved.

Further, if the diameter and length of the fuse wire are within the above-mentioned regulation values, the fuse wire can be quickly cut, and the fuse wire can be blown within a time within 1/2 of the commercial power supply frequency cycle. it can.

When the wire diameter is less than 0.08 mm,
Even if an overcurrent slightly lower than the rated current flows, the lamp may be blown, and the lamp may be blown even by a rush current at the start of energization of the bulb. On the other hand, if the wire diameter exceeds 0.18 mm, the current capacity increases and it is not safe to fuse at a predetermined upper limit current. If an arc discharge occurs between the broken portions of the filament, the discharge continues and the filament continues to break. Scatters a lot of lumps,
There is a possibility that a thermal shock is applied to the valve to cause many cracks.

As for the length of the fuse line, a value of 0.
If the length is 8 to 18 mm and less than 0.8 mm, even if the fuse wire is blown, a slight gap is maintained, so that arc discharge continues and a current of several hundred times the rated value flows. There is a problem that the molten metal is melted and splatters on the base wall to damage the base and the base cannot be easily removed from the socket. On the other hand, if it exceeds 18 mm, the fusing length of the fuse wire increases, the melting volume increases, and the ingot becomes large, which is not preferable.

According to experiments performed by the present inventors, the preferred diameter of this fuse wire is about 0.10 to 0.16 mm and the length is 4 mm.
When the current is about 10 to 10 mm, the circuit can be reliably shut off according to the overcurrent. Further, the wire diameter and length of the fuse wire may be selected within the above range according to the rating of the bulb to be applied.

Further, by setting the outer diameter and length of the external lead wire mainly composed of nickel to be connected to the fuse wire to be within the above-mentioned regulation values, the external lead wire connected to the fuse wire when the fuse wire is blown can be reduced. It is designed to withstand overcurrent and arc discharge, prevent the lead wires other than the fuse wires from melting, and reduce cracks in the bulb due to ingots. Also, if the wire diameter of the nickel wire to the fuse wire is less than 1.2 times, the nickel wire is also blown when the fuse wire is blown, which is not preferable. Welding becomes difficult.

According to a sixth aspect of the present invention, there is provided a bulb, a filament disposed substantially on a central axis of the bulb, and one end connected to the filament and the other end embedded in the sealing portion. And a wire having a wire diameter of 0.08 to 0.18 mm and a length of 10 to 100 times the wire diameter, and when an overcurrent occurs in the filament, a half of the commercial power supply frequency cycle 1. A fuse wire and a fuse wire diameter that is blown in less than 1.2 times to 2.times.
A fuse structure composed of external lead wires mainly composed of nickel and having a wire diameter of 5 times and connected to both ends of the fuse wire, and sealed in a valve so as to be 2.02 × 10 ⁵ Pa or less at room temperature. And a visible light transmitting infrared reflecting film formed on the surface of the bulb.

[0038] In the apparatus maintaining the sealing pressure described in the above claim, the wire diameter and length of the fuse wire and the wire diameter of the nickel-based lead wire connected to the front and rear ends of the fuse wire are regulated. The same operation as that of the item 5 is achieved.

A light bulb according to a seventh aspect of the present invention is characterized in that the fuse wire is mainly made of nickel and / or copper.

The fuse wire is made of a metal wire mainly composed of at least one of nickel and copper, such as monel metal, constantan or a nickel-manganese alloy. This material has an electric resistivity suitable for the fuse wire, It is often used as a fuse. However, conventional bulbs have a wide allowable range for overcurrent, and may not function as a fuse even when arc discharge continues.

The fuse wire mainly composed of at least one of nickel and copper prevents surface oxidation in a temperature range in which ordinary bulbs are used, and prevents a change in fuse wire blowing conditions due to progress of oxidation, so that the fuse wire is reliably blown. Can be. Further, it has been found that the above-mentioned fuse wire has no directivity in the vapor scattered at the time of fusing, and its size is substantially equal to each other, and it is easy to be cooled and solidified. As a result, it is found that the fusing time is shortened and the variation is reduced.

According to the present invention, the responsiveness to overcurrent such as when arc discharge continues is improved. For example, when the rating is 100 to 110 V, the present invention is applied to a light bulb of 65 to 130 W, and has the same effect as that described in the fourth aspect.

The bulb according to claim 8 of the present invention is connected to an external lead wire, accommodates a sealing portion, and has a cavity space volume in the base joined by an adhesive that is 10 times smaller than the fuse volume. sealing portion, characterized in that is ^{3 to 105} times, the cavity together with the base body, fuse wire located in the cavity of the die surrounded by such a shell or adhesive is a high temperature during blowing of fuse wire If the portion is closed or nearly closed by the adhesive, a high-pressure atmosphere is created, and the vapor is trapped in the hollow portion, short-circuits between both lead wires, an arc is generated, and the base body and the shell are destroyed.

[0044] This is related to the ratio of the volume of space within the volume and the cavity portion of the fuse wire to be scattered, the volume of the fuse wire, the space volume of the cavity is less than 10 ³ times becomes high temperature and high pressure atmosphere of the Then, the base is easily broken. Conversely, the fact that the space volume in the cavity exceeds 10 ⁵ times has the advantage that the high-pressure atmosphere described above can be avoided, but it causes the base to be large, reduces the appearance of the bulb, and reduces the material used. There are cases such as using a lot and increasing the cost.

The bulb according to the ninth aspect of the present invention is characterized in that the thickness of the bulb is within 1.0 mm ± 15%.

The thickness of the valve is less than 0.85 mm (−15
%), An arc or the like is generated in the fuse or the lead wire, and when a high-temperature ingot of these members collides with the valve, a crack may be caused by a thermal shock to the valve at the collision portion and the valve may be ruptured. Conversely, the thickness is 1.15 mm
Above (+ 15%), distortion or residual during thermal processing such as sealing work may reduce the mechanical strength of the valve, and may cause a problem in pressure resistance.

When the glass thickness of the bulb is reduced, the surface is easily cooled, and as a result, as described above, the situation of various substances in the bulb is greatly changed. It changes greatly. Conversely, the same applies to the case where the glass thickness is too large. In order to perform an appropriate fuse operation and prevent damage to the bulb, it is necessary to regulate the thickness within an appropriate range. According to experiments by the present inventors, favorable results were obtained within the above range.

According to a tenth aspect of the present invention, there is provided a bulb with a reflecting mirror, comprising: the bulb according to any one of the first to ninth aspects; and a reflecting mirror having a neck fixed to a sealing portion of the bulb. It is characterized by having.

The sealing portion of the electric bulb is fixed to the neck portion of the reflecting mirror via a heat-resistant adhesive, and the two are integrated, so that the light distribution maintaining characteristics during the life is not changed. The same action as described in any one of (1) to (9) is exerted.

The lighting apparatus according to the eleventh aspect of the present invention is
It is characterized by comprising a fixture main body, a reflector disposed on the fixture main body, and the light bulb according to any one of claims 1 to 9 disposed optically opposite to the reflector. I do.

A base may or may not be attached to the end of the bulb with a reflecting mirror.

The lighting apparatus according to the twelfth aspect of the present invention comprises:
It is characterized by comprising an appliance main body and the light bulb with a reflecting mirror according to claim 10 provided in the appliance main body.

The light bulb with a reflector according to the tenth aspect mounted on the socket of the appliance body has the same function as the tenth aspect.

[0054]

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 front view of a halogen lamp L1 of 10V65W, FIG. 2 is an explanatory view of a bulb part of the bulb L1, and FIG. 3 is an enlarged view of a part of a visible light transmitting infrared reflection film formed of a multilayer light interference film formed on the surface of the bulb. It is sectional drawing.

The bulb 1 is made of quartz glass and has a tubular shape with a slightly bulged central portion, and a straight tubular portion at one end has molybdenum (M) constituting a part of an introduction conductor (lead) 2.
o) and the like, and a crush sealing portion 3 in which a pair of metal foils 21 and 21 are sealed is formed. An exhaust pipe 4 is connected to the other end of the valve 1.

The thickness of the straight portion 11 of the original glass tube near the crushed sealing portion 3 forming the bulb 1 is about 1 mm and the outer diameter D1 is about 10 mm (the sealing portion 3 is crushed by being pressed by a pincher. In the central portion connected to the straight portion 11, a bulging portion 12 having a curved portion 12a having a length B of about 26 mm and a surface of a rotating sphere is formed. The outer diameter D3 of the largest outer diameter portion 13 at the center of the portion 12 is about 1
2 mm.

The bulging portion 12 formed in the valve 1 is shown in FIG. 2 and has a point P as an origin, and a center axis x of the valve 1 (located on the center axis x of the valve 1) and a direction orthogonal to the center axis x. x drawn with y as the center of the largest diameter portion of the bulging portion 12
It has a shape formed by a curve based on the y coordinate.
(Refer to Examples 1 and 2 to be described later, and Example 3 (FIG. 4) has a linear portion formed in the center of the bulging portion 12.) Further, a crushed sealing portion at one end of the valve 1. Each of the metal foils 21 and 21 embedded and sealed in the inside 3 has an internal lead wire 2.
2, 22 and external lead wires 23 are connected to each other, and three members of the metal foil 21, the internal lead wire 22, and the external lead wire (not shown) constitute the introduction conductor 2.

The wire diameter between the internal lead wires 22 made of, for example, molybdenum (Mo) wire is 0.0
Tungsten (W) wire having a length of 520 to 0.055 mm and a length of 590 to 620 mm has a first pitch of 200 to 230.
%, Coil diameter 0.3-0.5mm, length 60-65m
m, 2nd pitch is 150 to 160%, coil diameter is 1.6
A double coiled filament 5 wound at a length of about 1.8 mm and a length of 8.0 to 10.0 mm is connected and arranged along the central axis of the bulb 1.

A small amount of a halide such as CH ₂ Br ₂ or CH ₃ Br and a mixture gas of krypton (Kr) and nitrogen (N ₂ ) are contained in a valve 1 having an internal volume of about 1.9 cc at room temperature. (25 ° C.) and sealed at about 1.5 × 10 ⁵ Pa (Pascal).

Further, 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. The red anti-reflection film 6 is made of titanium dioxide (Ti) which forms a high refractive index layer film 6H on the glass surface of the bulb 1.
O ₂ ) and silicon dioxide (S) forming the low refractive index layer 6L,.
iO ₂ ) are alternately repeated to form a multilayer optical interference film in which predetermined layers are stacked.

In the figure, reference numeral 7 denotes a base. The base 7 is attached to a main body 71 having a large-diameter portion made of ceramic such as steatite or cordierite and having a cavity therein, and the small-diameter portion. Shell 72 and a top eyelet 73. Then, the crushed sealing portion 3 at the end of the valve 1 is housed in the hollow portion in the large diameter portion, and the two are joined via an adhesive, and the shell 72 and the eyelet portion 73 are connected so that the ends of the external lead wires do not short-circuit with each other. Are electrically connected to each other by means such as welding or brazing.

When the light bulb L1 having such a configuration is turned on,
The pressure of the inert gas sealed in the valve 1 is 2 at normal temperature.
Although the pressure is increased to 3 to 7 × 10 ⁵ Pa, which is about three times, the pressure can be reduced by about 40% compared to the conventional bulb, and the burst of the bulb 1 can be prevented. Further, since the bulb 1 has a shape having the spherical bulging portion 12, the pressure resistance is stronger than that of the straight cylinder. There is a concern that the luminous efficiency may decrease due to the reduced pressure.However, krypton having a large atomic weight and a low thermal conductivity as compared with argon is mixed as an inert gas, so that the evaporation rate of tungsten is suppressed. Luminous flux 1000 to 1100 Lm and life 2000 to 24
00 hours could be obtained.

The pressure of the inert gas sealed in the valve 1 expands and rises as the temperature increases. This pressure can be calculated by the following equation.

[0064]

(Equation 1) Then, the filament 5 disposed along the central axis of the bulb 1 generates heat and emits a large amount of infrared light together with visible light, and most of the visible light among the light emitted from the filament 5 is the bulb 1 and the red film 6. And emitted to the outside of the bulb 1. Also, 780 radiated from the filament 5
Infrared light up to about 2000 nm as well as the wavelength range of ~ 1500 nm is reflected by the red film 6 and returned to the filament 5.
(The emission of the infrared light from the filament 5 and the reflection from the red film 6 are repeated.) The filament 5 is reheated to increase the light emission, and as a result, the visible light emission from the filament 5 increases, and the light emission is increased. Efficiency can be improved.

The red film 6 of the bulging portion 12 of the bulb 1 is narrowed at one end to the straight portion 11 from the sealing portion 3 and at the other end to the thin exhaust pipe 4 from the bulging portion 12. The bulging portion 12 is formed even at a portion where the shape of the bulging portion 12 does not change drastically.

As described above, in the bulb 1 of the present invention, the maximum outer diameter D3 of the bulging portion 12 is about 1.2 times the outer diameter D1 of the original glass tube, in other words, the outer diameter of the cylindrical bulb 1 is reduced. The surface does not have a portion where the outer shape (diameter) changes suddenly greatly (curvature is small), and the boundary between the bulging portion 12 and the straight portion 11 is smoothly and continuously formed as a continuous surface. When dipping and pulling up, the coating solution does not accumulate near this boundary and the coating does not become thicker than a predetermined value.
Further, the formation of the red anti-reflection film 6 on the connection portion side with the exhaust pipe 4 where the outer diameter (curvature) changes abruptly extends to a portion where the outer diameter (curvature) becomes slightly smaller. In the red anti-reflection film 6, the high refractive index layer films 6H,... And the low refractive index layer films 6L,... Differ from titanium dioxide (TiO ₂ ) and silicon dioxide (SiO ₂ ) in material and thermal expansion coefficient. Then, although the stress is applied to the coating 6 due to the blinking of the light bulb L1, no cracking or peeling occurs because the entire coating 6 has a substantially constant thickness.

FIG. 4 is an explanatory view of a bulb portion of a light bulb showing a second embodiment of the present invention. The structure other than the bulb is the same as that of the first embodiment. The same parts as those of the embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The bulb 1 of the electric bulb shown in FIG. 4 is different from the first embodiment in that the bulging portion 12a has a curved surface portion 12a having one curvature.
The valve 1 shown in FIG. 4 has a straight portion 14 at an intermediate portion of the bulging portion 12, and a curved surface formed of a rotating spherical surface having the same curvature or a different curvature before and after the straight portion 14. Part 1
2a and 12b are connected in series.

In this case, the largest outer diameter portion 13 of the bulging portion 12 is a straight portion 14, and the difference in outer diameter between the bulging portion 12 and the straight portions 11, 14 is the same as in the above embodiment. Thus, the curvature of the connecting surface in the vicinity of the boundary can be increased, and the coating 6 having a substantially uniform thickness can be obtained as a whole without the red film 6 formed in the vicinity of the boundary becoming thick. Accordingly, the same operation and effect as those of the first embodiment can be obtained.

Therefore, the halogen lamp L1 having the structure shown in the above-described first and second embodiments can change the shape of the bulb 1 and reduce the pressure of the inert gas sealed in the bulb 1, thereby reducing the bulb 1 Burst can be completely prevented. In addition, the reduction of the emission characteristics due to the lowering of the pressure of the inert gas can be compensated for by selecting the type of the inert gas and by forming the red anti-reflection film 6 on the surface of the bulb 1 to achieve the emission characteristics and lifespan longer than those of the conventional bulb. It is possible to provide a light bulb L1 that can obtain characteristics. Further, by specifying the shape of the bulb 1, the thickness of the red film 6 can be made substantially constant, and peeling of the film 6 can be suppressed.

In order to form the above visible light transmitting infrared reflecting film (red film) 6 by the immersion method, first, the bulb 1
A filament 5 is sealed therein and evacuated to prepare a light bulb in which halogen and an inert gas are sealed. Separately, as a substance forming the high refractive index layers 6H,..., An organic titanium compound such as tetraisopropyl titanate is reacted with acetylacetone or polyethylene glycol to have a titanium content of 2 to 2 dissolved in an ethanol solvent.
A titanium solution adjusted to 10% by weight and a viscosity of about 2.0 cps, and an organic silicon compound such as an ethyl silicate polymer as a substance for forming the low refractive index layer 6L are dissolved in an organic solvent, and the silicon content is reduced. A silicon solution adjusted to 2 to 10% by weight and a viscosity of about 1.0 cps is prepared.

First, the external shape (outer diameter) of the bulging portion 12 on the exhaust pipe 4 side is suddenly changed from the sealing portion 3 side into the titanium solution in an atmosphere of constant temperature and humidity under a constant temperature and humidity atmosphere. Immersion up to the part to be lifted at a predetermined speed, and after drying, about 8
Baking at 00 ° C (700-900 ° C) for about 10 minutes
High refractive index layer 6 made of titanium oxide (TiO ₂ ) film
Form H.

Next, the first layer of titanium oxide (Ti
The valve 1 on which the high refractive index layer 6H made of an O ₂ film is formed is immersed in the above-mentioned silicon solution in a constant temperature and humidity atmosphere, pulled up at a predetermined speed, dried, and dried in air at about 800 ° C. (700 to 700 ° C.).
By firing at 900 ° C. for about 10 minutes, a low refractive index layer 6L made of a first silicon oxide (SiO ₂ ) film is formed. Hereinafter, similarly to the above, the third and subsequent high refractive index layers 6H,
The red anti-reflection film 6 can be obtained by alternately stacking the low refractive index layers 6L and forming a total of eight layers here, for example.

FIG. 5 shows a third embodiment of the present invention.
2, which is the same as FIG. 1 to FIG. 4, and the description thereof is omitted.

The halogen lamp L2 shown in FIG.
It has almost the same configuration as the light bulb shown in FIG. The bulb 1 has a straight, substantially cylindrical shape made of, for example, quartz glass having an outer diameter D1 of about 10 mm, a length of about 40 mm, and an inner volume of about 1.4 cc. , 22 and external lead 2
Metal foils 21 and 21 made of molybdenum (Mo) or the like to which the metal foils 3 and 23 are connected are embedded and sealed. In the bulb 1, a double coiled filament 5 having the same configuration as that shown in the first embodiment is connected between the internal lead wires 22,22.

The external lead wires 23 connected to the metal foils 21 and 21 and extending out of the sealing portion 3 have a wire diameter of, for example, a molybdenum (Mo) wire 23a having a wire diameter of 0.5 mm. A nickel (Ni) wire 23b mainly composed of 0.5 mm nickel (Ni) (50% or more) is connected, and a wire diameter of about 0.16 m is provided at an intermediate portion of the nickel (Ni) wire 23b.
m, Monel metal (Ni60-70)
%, Cu 26-34%, balance Fe, Mn, Si, C, A
It consists of 1, S, etc. and has an electric resistivity (20 ° C.) of about 0.44.
Ωmm ² / m) line is connected as a fuse 23c. That is, the external lead wire 23 is connected to the molybdenum (Mo) wire 23 a connected to the metal foil 21 by nickel (Ni).
It consists of three parts (parts) connecting the line 23b, the Monel metal line forming the fuse 23c, and the nickel (Ni) line 23b.

The external lead wire 23 having the small-diameter fuse 23c interposed therebetween is manufactured by a nickel (Ni) wire 23.
Butt welding in which the end faces of the fuse b and the fuse 23c butt each other may be performed, but welding the wires in parallel to each other has an advantage that the joining area increases and the tensile strength can be improved.

Further, the base body 71 having a hollow portion 74 made of ceramic such as steatite is provided on the crushed sealing portion 3 with a heat-resistant adhesive 75 made of silicon or the like.
One external lead wire 23 is connected to the shell 72 through an insertion hole 76 formed in the main body 71 with a cross-sectional area of about 0.1 to 0.2 mm ² , and the other is connected to the other. The external lead wire 23 is directed to the eyelet portion 73, and is electrically connected to the nickel (Ni) wires 23b, 23b at the tips.

The bulb 1 contains a halide, argon (Ar), krypton (Kr), and nitrogen (N
₂ ) is mixed with an inert gas at room temperature (25 ° C.) for about 1.
5 × 10 ⁵ Pa (Pascal) is sealed, and a visible light transmitting infrared reflecting film (red anti-reflective film) 6 is formed around the outer surface of the bulb 1.

When the halogen lamp L2 also emits light, the light flux of 1000 to 1100 Lm is
It has a life characteristic of 2,000 to 2,400 hours.

When the filament 5 is worn out, such as when the filament 5 reaches the end of its life, such as when the filament 5 is worn out and an arc discharge or the like is generated between the ends of the broken portion, the halogen lamp L2 is short-lived (instantaneously). The electric circuit can be interrupted within the time period. That is, if an arc current or the like is generated between the leading ends of the broken portions of the filament 5 and an overcurrent flows through the introducing conductor 2, the fuse 23c made of a monel metal wire constituting the external lead wire 23 immediately rises in temperature and melts to cut off the circuit. I do. In most cases, the fuses 23c, 23c of the two external lead wires 23, 23 are blown at the same time.

This is achieved by reducing the diameter of the fuse 23c. The fuse 23c is reduced to about 5 ms (less than about 10 milliseconds (msec) at half the frequency of the commercial power supply frequency (for example, 50 Hz). The electric circuit can be interrupted in a short time of millisecond before an arc discharge occurs, or in an extremely short time (instantaneous) even if an arc discharge occurs.

FIG. 6 is an explanatory diagram of this situation. The horizontal axis shows the frequency period (1 Hertz), and the vertical axis shows the current. That is, if an abnormal condition occurs and the current A suddenly flows, the fuse line is blown and cut off the circuit within 1/2 of 1 Hz, so that the continuation of the arc discharge can be stopped.

The cavity 74 of the base body 71
Has only a small gap in the through hole 76 and the adhesive 75 of the external lead wire 23 surrounded by the base body 71, the sealing portion 3 and the adhesive 75, and the communication path between the cavity 74 and the outside is small. In some cases, the condition is almost closed. In this case, when the fuses 23c, 23c of the external lead wires 23, 23 located in the cavity 74 are blown, the inside of the cavity 74 is exposed to a high-temperature and high-pressure atmosphere for a short time, so that the fuse metal vapor is formed. Squat, both external leads 23, 23
The short circuit causes arc discharge in the cavity 74,
If the base body 71 or the shell 72 is exposed, the wall surface of the shell 72 may be broken or cracked.

Of course, if the internal volume of the hollow portion 74 is large or the hollow portion 74 and the outside communicate with each other over a large area, there is no problem in ventilation, and the vapor of the fuse metal scatters to suppress the occurrence of arc discharge. You.

According to the considerations of the present inventors, this arc discharge is generated when the inside of the cavity 74 is close to hermetic as described above, with respect to the volume of the fuse wire 23c. It was found to be prevented if spatial volume is 10 ³ times or more. That is, it is related to the ratio between the volume of the scattered fuse line 23c and the space volume in the cavity 74, and the space volume in the cavity 74 is 10 times the volume of the fuse line 23c.
^If it is less than ^three times, the inside of the cavity 74 becomes a high-temperature and high-pressure atmosphere of the fuse metal vapor, so that arc discharge easily occurs. Also, before the scattered fuse metal vapor solidifies, it adheres to the inner wall of the base body 71, and the base body 7
1 may cause cracks. On the contrary, the large space volume in the cavity 74 can suppress the occurrence of arc discharge while avoiding the high-temperature and high-pressure atmosphere described above. Of the fuse wire 23c, the space volume in the cavity 74 becomes 1 with respect to the volume of the fuse wire 23c.
If 0 ⁵ times or less, it has been found that can hold satisfactory quality. Incidentally, the space volume excluding the sealing portion 3, the adhesive 75, and the external lead wires 23 in the hollow portion 74 of the base body portion 71 of the lamp bulb L2 shown in the third embodiment is about 4.0 × 10 3. ^{At 2} mm ³ , it is about 3.35 × 10 ³ times that of the fuse 23c.

As described above, by optimizing the fuse line 23c, when an overcurrent such as arc discharge flows when the filament 5 is broken, the circuit can be cut off in a very short time (instantaneous). When a discharge occurs, the duration of the discharge is shortened so that the molten mass of the hot red filament 5 does not scatter on the inner surface of the bulb 1 and gives a thermal shock to the bulb 1 or the base 7 to cause cracks. I will not let you. Therefore, rupture of the valve 1 and destruction of the base can be reliably prevented, and safety can be improved.

In the above, the surface of the monel metal wire forming the fuse 23c is formed on the surface of borax (Na ₂ B ₄ O ₇ ).
If an oxide film such as is provided, borax (Na ₂ B) is generated by Joule heat generated from the fuse 23c when a large current flows through the fuse 23c and sputter heat generated by fusing.
₄ O ₇ ) is thermally decomposed to generate sodium Na and boron B. Since these substances have an extinguishing action, it is possible to prevent discharge generated between the ends of the blown fuse 23c. For this reason, no arc discharge occurs in the base 7 and the introduction conductor 2
As a result, the current can be cut off in a very short time after the filament 5 is disconnected, and the burst of the valve 1 can be reliably prevented and safety can be improved.

Further, an external lead wire 23 connected to a metal foil 21 made of molybdenum (Mo) or the like embedded and sealed in the crushed sealing portion 3 is connected to a bulb 1 made of quartz glass.
Differs from the metal foil 21 in that it has a larger diameter (thick wall) than that of the metal foil 21, and is not air-tightly joined to the valve 1, and a minute gap is formed. For this reason, the halogen bulb L
The external lead wire 23 heated during lighting is gradually oxidized from the exposed portion, and gradually the portion in the sealing portion 3 and the metal foil 2
1 and finally oxidizes to the metal foil 21. The oxidation of the metal foil 21 breaks the metal foil 21 or causes the sealing portion 3 of the bulb 1 to separate from the glass, causing a leak or a crack, thereby shortening the life of the bulb L2.

The oxidation of the external lead wire 23 is
Although there are various means that do not affect the metal foil 21, a low melting point glass or the like is applied or filled to a base portion of the end face of the crushed sealing portion 3 from which the external lead wire 23 is led out, so that the invasion of the outside air is blocked and Oxidation can be prevented.

A rated voltage of 110 V85 of the same kind as that of FIG.
W, the outer diameter D1 of the same type as the above embodiment is about 10 mm,
A similar effect can be obtained in a bulb L2 having a length of about 40 mm and an inner volume of about 1.4 cc and having a cylindrical shape and having a visible light transmitting infrared reflecting film 6 formed on the surface of the bulb. It could be confirmed.

The filament 5 connected between the inner lead wires 22 has a strand diameter of 0.067 to 0.07.
0 mm, tungsten (W) wire having a length of 540 to 560 mm, first pitch of 160 to 170%, coil diameter of 0.3 to 0.4 mm, length of 65 to 75 mm, 2nd pitch of 125 to 135%, coil diameter Is 1.6-1.7m
m, a double coil having a length of 8.0 to 10.0 mm wound along the central axis of the valve 1.

The external lead wires 23 are connected to, for example, a molybdenum (Mo) wire 23a having a wire diameter of 0.5 mm.
A nickel (Ni) wire 23b having a wire diameter of 0.5 mm is connected, and a Monel metal wire or constantan (Ni40-43) having a wire diameter of about 0.16 mm and a length of about 7 mm is connected to an intermediate portion of the nickel (Ni) wire 23b. %, Cu 57-60%
And the electrical resistivity (20 ° C.) is about 0.50 Ωmm ² /
m) The line is connected as a fuse 23c.
The space volume excluding the sealing portion 3, the adhesive 75, and the external lead wires 23 in the hollow portion 74 of the base body 71 is about 4.0 × 10 ² mm ³ , and the space volume of the fuse 23c is about 3 × 10 ² mm 3. It is about 35 × 10 ³ times.

The electric bulb L2 having this configuration also has the same operation and effect as the third embodiment. That is, when an overcurrent flows through the introducing conductor 2, the fuse 23c is turned on within a short time (instantaneous) of about 4 milliseconds, which is less than half the commercial power frequency cycle (for example, about 10 milliseconds (msec) at 50 Hz). Filament 5 caused by arc discharge etc.
Scattering of the ingot was prevented.

Therefore, the rupture of the bulb 1 and the destruction of the base can be reliably prevented, and the safety can be improved.
Excellent light emission characteristics and a lifetime of from 000 to 1600 Lm and a lifetime of from 2,000 to 3,000 hours could be achieved.

FIG. 7 is a graph showing the residual ratio of the fuse 23C used for the above-mentioned 110V 85W electric bulb. The solid line 16 in the figure is a fuse wire made of a Monel metal wire having an outer diameter of 0.16 mm, the dotted line 20 is a fuse wire made of a Monel metal wire having an outer diameter of 0.20 mm, and the horizontal axis is the arc duration. (Msec), the vertical axis indicates the residual rate (%).

As is apparent from FIG. 7, the fuse wire having a small outer diameter has a smaller capacity than the fuse wire having a larger diameter, and is easily blown. Therefore, the duration of the arc is short, and the duration is about 60% at 5 msec and 10 msec. Approximately 10% remains, whereas the fuse wire with an outer diameter of 0.20 mm is 100% at 5 msec and approximately 85% at 10 msec.
It can be seen that even if the arc remains, the arc does not easily melt.

Therefore, it was found that a fuse wire having a long arc duration and an outer diameter of 0.20 mm was liable to form ingots and easily cracked the bulb. When the outer diameter of the fuse wire was about 0.16 mm, the fuse was blown in a short time (１ ／ of the commercial power supply frequency cycle and about 10 msec), and it was confirmed that the arc lasted for a short time.

FIG. 8 shows a (halogen) bulb RL with a reflecting mirror according to a fourth embodiment of the present invention.
1 to 3 are the same as those described in FIG.
The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted.

In FIG. 8, reference numeral 8 denotes a reflecting mirror having a reflecting surface having a shape such as a paraboloid of revolution or a spheroid formed of a hard glass, a heat-resistant synthetic resin or a metal body. , A light / heat reflection film 81 made of silver or a visible light reflection infrared transmission film 81 such as a dichroic film
The central base 82 has a through hole 83 in which the crushed sealing portion 3 of the bulb L1 is accommodated. Then, in a state where the crushed sealing portion 3 of the electric bulb L1 is placed in the through hole 83, a heat-resistant adhesive 84 such as silicon is injected, and
After the focusing of the position of the filament 5 with respect to the reflection surface 81 is completed, the adhesive 84 is solidified to integrate the two.

When the light bulb RL with reflector shown in FIG. 8 is turned on, the halogen bulb L1 has the same function as the above embodiment, and the strength of the bulb 1 and the coating 6 is improved and the halogen bulb L1 is integrated with the reflector 8. As a result, the light emission characteristics were further improved. In this light bulb RL with a reflector, there is no risk of the bulb 1 rupture of the light bulb L1, but a cover member may be provided to cover the front opening of the reflector 8 for light control.

FIG. 9 shows a lighting fixture 9 according to a fifth embodiment of the present invention. 8, reference numeral 91 denotes a base attached to a ceiling surface or the like, 92 denotes a support pole, 93 denotes a pole 9
2, a universal joint rotatably attached to the distal end of the instrument 2, 94 is an instrument body provided with the universal joint, and 95 is a reflector provided in a front opening of the instrument body. A socket (not shown) is provided, and a lighting fixture 9 is configured by attaching a base of the halogen bulb L1 or L2 to the socket (not shown).

When the light bulbs L1 and L2 mounted on the lighting fixture 9 shown in FIG. 9 are turned on, the light bulbs LL1 and L2 exhibit the same operation as in the above embodiment, and the strength of the bulb and the coating can be improved. The light emission characteristics as well as the properties were improved. In addition, in this lighting fixture 9, the light bulbs L1 and L
There is no risk of the bulb 1 bursting, but a cover member may be provided to cover the front opening of the instrument body 94 for light control.

[0104]

[Examples] 1. Halogen bulb rating 110V65W For bulb (1) Configuration (same configuration as in Fig. 2) Overall length (B) (excluding exhaust pipe) of bulb (1) 42 ± 0.5mm, Glass tube outer diameter of straight part (11) (D1) 10 ± 0.1 mm, length (B1) 16 ± 0.1 mm, maximum outer diameter (D3) of the bulging portion (12) 12 ± 0.1 mm, length (B2) 26 ± 0. 1 mm, the xy coordinate of the curved surface of the rotating sphere is (x−29) ² + (y + 36.25) ² = 43.25 ² Halogen bulb rating 110V85W Configuration of bulb (1) (same configuration as in Fig. 2) Overall length of bulb (1) (B) (excluding exhaust pipe) 42 ± 0.5 mm, glass tube outer diameter of straight part (11) (D1) 10 ± 0.1 mm, length (B1) 16 ± 0.1 mm, maximum outer diameter (D3) of the bulging portion (12) 12 ± 0.1 mm, length (B2) 26 ± 0. 1 mm, the xy coordinates of the curved surface of the rotating sphere are (x-29) ² + (y + 79) ² = 85 ² 3. Halogen bulb rating 110V130W Configuration of bulb (1) (same configuration as in Fig. 4) Overall length (B) (excluding exhaust pipe) of bulb (1) 42 ± 0.5mm, Glass tube outer diameter of straight part (11) (D1) 10 ± 0.1 mm, length (B1) 16 ± 0.1 mm, maximum outer diameter (D3) of the bulging portion (12) 12 ± 0.1 mm, length (B2) 26 ± 0. 1 mm, curved portion (12a) length (B3) 8 ± 0.1 mm, straight portion (14) length (B5) 10 ± 0.1 mm, curved portion (12b) length (B4) 8 ± 0.1 mm, curved surface portion of the rotating sphere The xy coordinates are (12a) (x−24) ² + (y + 26.5) ² = 32.5 ² (12b) (x−34) ² + (y + 26.5) ) ² = 32.5 ²

[0105]

According to the first aspect of the present invention, various characteristics such as light emission characteristics, life characteristics and arc voltage do not decrease.
In addition, the bulb can be prevented from being ruptured due to internal pressure, and a light bulb having improved safety by preventing personal injury or damage to displayed products can be provided.

According to the second and third aspects of the present invention, it is possible to prevent cracking and peeling of the visible light transmitting infrared reflecting film that complements the deterioration of the light emitting characteristics, to form a film having a substantially uniform thickness, and to have a high pressure resistance. Can provide a light bulb having a bulb with improved performance.

According to the fourth aspect of the present invention, when an overcurrent flows, the fuse is reset within a short period (instantaneous) of 1/2 or less of the commercial power supply frequency cycle (for example, about 10 milliseconds (msec) at 50 Hz). As a result of stopping the arc discharge or the like by fusing, the ingot such as the red-hot filament does not scatter on the inner surface of the bulb, and the bulb does not crack and rupture or break the base. In addition, it is possible to provide a bulb with improved safety, in which the burst of the bulb is reliably prevented in combination with the reduction of the filling pressure of the inert gas.

According to the fifth and sixth aspects of the present invention, the same effect as described in the fourth aspect can be obtained by regulating the diameter and length of the fuse and the lead wire connected to the fuse.

According to the invention of claim 7, a general-purpose fuse can be used.

According to the eighth aspect of the present invention, it is possible to provide a light bulb in which there is no risk of breakage such as cracking or fusing in the main body or shell of the base.

According to the ninth aspect of the present invention, it is possible to provide a light bulb which is resistant to pressure rupture and resistant to thermal shock and which is not likely to burst.

According to the tenth aspect, the first aspect is provided.
Since the bulb having the effects described in claim 9 is provided, it is possible to provide a reflector-equipped bulb with improved safety that can prevent the bulb from being ruptured.

According to the eleventh aspect, the first aspect is provided.
In addition, since the light bulb having the effects described in claim 9 is provided, it is possible to provide a luminaire with improved safety that can prevent bursting of the bulb.

According to the twelfth aspect, the first aspect is provided.
Since the light bulb with the reflecting mirror having the effect described in No. 0 is mounted, a lighting fixture with improved safety can be provided.

[Brief description of the drawings]

FIG. 1 is a front view of a halogen lamp showing a first embodiment of the present invention.

FIG. 2 is an explanatory view of a bulb portion of the light bulb of FIG.

FIG. 3 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. 4 is an explanatory diagram of a valve portion showing a second embodiment of the present invention.

FIG. 5 is a partial cross-sectional front view of a halogen lamp showing a third embodiment of the present invention.

FIG. 6 is an explanatory diagram showing a state of fuse blowing.

FIG. 7 is a graph comparing the arc duration and the remaining rate according to the fuse outer diameter.

FIG. 8 is a partial cross-sectional front view of a halogen lamp with a reflector according to a fourth embodiment of the present invention.

FIG. 9 is a perspective view of a lighting fixture showing a fifth embodiment of the present invention.

[Explanation of symbols]

 L1, L2: bulb (halogen bulb) RL: bulb with reflector (halogen bulb with reflector) 1: bulb 11, 14: straight section 12: bulging section 12a, 12b: curved section 13: maximum outer diameter section 2: Introduced conductor (lead wire) 22: Internal lead wire 23: External lead wire 23c: Fuse 3: Sealing part 4: Exhaust pipe 5: Filament 6: Visible light transmitting infrared reflecting film (multilayer light interference film) 6H: High Refractive index layer 6L: Low refractive index layer 7: Base 71: Base body 72: Shell 74: Cavity (space) 8: Reflector 9: Lighting equipment

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01K 7/00 H01K 7/00 A

Claims (12)

[Claims] 1. A sealing portion, a straight portion connected to the sealing portion, and a curved surface having an outer diameter of 1.4 times or less the outer diameter of the straight portion. 1. a bulb having a bulging portion; 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; 02
A light bulb comprising: a sealed gas sealed in a bulb so as to be 10 ⁵ Pa or less; and a visible light transmitting infrared reflecting film formed on at least a bulging portion of the bulb. 2. The light bulb according to claim 1, wherein a part of the bulging portion is formed of any one of a sphere, a spheroid, a paraboloid of revolution, and an ellipsoid of revolution. 3. The light bulb according to claim 1, wherein a second straight portion is formed in the middle of the bulging portion. 4. A bulb; a filament disposed substantially on a central axis of the bulb; a lead wire having one end connected to the filament and the other end embedded in the sealing portion; While being connected to each other,
A fuse wire which is blown in a time within 1/2 of a commercial power frequency cycle when an overcurrent occurs in the filament;
A light bulb comprising: a sealed gas sealed in a bulb so as to be 3 to 7 × 10 ⁵ Pa when lit; and a visible light transmitting infrared reflecting film formed on a surface of the bulb. . 5. A bulb; a filament disposed substantially on a central axis of the bulb; a lead wire having one end connected to the filament and the other end embedded in the sealing portion; With a wire diameter of 0.18 mm,
A fuse wire formed to have a length of 0 to 100 times and an external lead wire mainly composed of nickel and having a wire diameter of 1.2 to 2.5 times the fuse wire diameter and connected to both ends of the fuse wire. Composed fuse structure; 2.0 at room temperature
A light bulb comprising: a sealed gas sealed in a bulb so as to have a pressure of 2 × 10 ⁵ Pa or less; and a visible light transmitting infrared reflecting film formed on a surface of the bulb. 6. A valve; 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; With a wire diameter of 0.18 mm,
The fuse wire is formed to have a length of 0 to 100 times, and is blown in a time within 1/2 of a commercial power supply frequency cycle when an overcurrent occurs in the filament. A fuse structure composed of nickel-based external lead wires having a wire diameter five times and connected to both ends of the fuse wire; 2.02 × 10 ⁵ Pa at normal temperature;
A bulb comprising: a sealed gas sealed in a bulb as described below; and a visible light transmitting infrared reflection film formed on a surface of the bulb. 7. The fuse wire according to claim 4, wherein the fuse wire is mainly made of nickel and / or copper.
7. The electric bulb according to any one of items 6 to 6. 8. A cavity space volume in a base which is connected to an external lead wire, accommodates a sealing portion, and is joined via an adhesive, is 10 ³ to 10 ⁵ times the fuse volume. The light bulb according to any one of claims 4 to 7, wherein 9. The bulb according to claim 4, wherein the thickness of the bulb is within 1.0 mm ± 15%. 10. A light bulb with a reflector, comprising: the light bulb according to claim 1; and a reflector having a neck fixed to a sealing portion of the light bulb. 11. The apparatus main body; a reflector disposed on the apparatus main body; and a reflector optically opposed to the reflector.
And a light bulb according to any one of claims 9 to 9. 12. A lighting device comprising: a device main body; and the light bulb with a reflecting mirror according to claim 10 disposed on the device main body.