JPH0582109A - Halogen lamp and downlight - Google Patents

Abstract

PURPOSE:To lengthen the service life of a lamp by lowering gas permeability of heat resisting inorganic cement to fix a base onto the outer surface of a sealing end part of a bulb, and preventing the occurrence of cracks caused by contraction in the case of drying/solidifying it. CONSTITUTION:A sealing end part 2a of a bulb 2 is inserted into a base 6, and heat resisting inorganic cement 7 is filled between them, and as for a particle diameter, the heat resisting inorganic cement 7 to fix the base 6 to this sealing end part 2a is formed by mixing fire resisting powder A having a small diameter of 10-20mu and fire resisting powder B having a large diameter of 50-70mu together, and the mixing ratio B/A is set to be 1.5-2.5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen bulb in which a base, which is a base, is fixed to a sealed end of a bulb with a heat-resistant inorganic cement, and more particularly, a halogen bulb having an improved heat-resistant inorganic cement and a down lamp incorporating the halogen bulb as a light source. Regarding lights.

[0002]

2. Description of the Related Art Generally, in a halogen bulb, one end of a pair of outer wells, which are external lead wires made of molybdenum, connected to the filament is hermetically sealed from a sealed end of a bulb made of quartz glass or the like. It is extended to the outside. In addition, in the base which is a base in which a pair of power receiving pins are planted, the sealing end of the valve and the outer ends of the pair of outer wells are inserted and heat-resistant inorganic cement is filled.
A base in which a pair of power receiving pins are planted is fixed to the valve sealing end.

[0003]

However, in such a conventional halogen light bulb, since the heat-resistant inorganic cement has air permeability, even if the outer end of the outer wells made of molybdenum is covered with the heat-resistant inorganic cement. Regardless, it contacts the outside air and oxidizes.

Moreover, since the halogen bulb is heated to a high temperature of, for example, 350 ° C. or higher due to its lighting, there is a problem that the oxidation of the outer wells rapidly progresses, the conductivity is lowered, and the lamp life is shortened.

Further, the conventional heat-resistant inorganic cement is mixed with a large amount of fine particles of refractory powder in order to reduce its air permeability and increase its hardness. There is a problem that a crack is generated in the inorganic cement, and as a result, the air permeability due to the crack is rather increased and the fixing force for fixing the sealing end portion of the valve to the base is reduced.

Therefore, the present invention has been made in consideration of such circumstances, and the purpose thereof is to reduce the air permeability of the heat-resistant inorganic cement and to extend the life of the lamp by suppressing the decrease in the fixing strength. It is to provide a halogen bulb and a downlight incorporating the halogen bulb as a light source.

[0007]

The present invention is configured as follows in order to solve the above-mentioned problems.

The invention according to claim 1 (hereinafter referred to as the first invention) of the present application airtightly extends the molybdenum external lead-in wire connected to the filament from the sealing end of the bulb containing the filament. Then, insert the sealed end of the valve and the outer end of the external lead-in wire into the base, and fill the base with the sealed end of this valve by filling a refractory inorganic cement mixed with refractory powder. In the halogen bulb, the heat-resistant inorganic cement has a particle size of 10 to 20 μm.
Refractory powder A having a small particle size and refractory powder B having a large particle size of 50 to 70 μ are mixed, and the mixing ratio B / A is 1.5 to 2.5.
It is characterized by being set to.

The invention according to claim 2 of the present application (hereinafter referred to as the second invention) is characterized in that the base of the halogen bulb according to the first invention is provided on the reflector and is embedded in the ceiling.

Furthermore, the invention according to claim 3 of the present application (hereinafter referred to as the third invention) is that the visible light reflecting infrared ray transmitting film is formed on the reflector of the downlight according to the second invention. Is characterized by.

Furthermore, the invention according to claim 4 of the present application (hereinafter referred to as the fourth invention) has an infrared reflection film for reflecting infrared rays on the outer surface of the bulb of the downlight according to the second or third invention. It is characterized by forming.

[0012]

[Action]

<First Invention> The heat-resistant inorganic cement has a particle size of 10 to 20.
The refractory powder A having a small particle size of μ and the refractory powder B having a large particle size of 50 to 70 μ are mixed, and the mixing ratio B / A is 1.5 to 2.
Since it is 5, the gaps between the particles having the respective large diameters are densely filled with the particles having the small particle diameters, and the denseness is improved.

For this reason, the air permeability of the heat-resistant inorganic cement is lowered, so that the molybdenum externally introduced wire covered with the heat-resistant inorganic cement oxidizes due to the air permeability of the heat-resistant inorganic cement by contacting with the outside air. It is possible to prevent the halogen bulb from rapidly advancing due to the temperature rise when the halogen bulb is turned on, and thus to prolong the life.

Further, since the shrinkage amount of the heat-resistant inorganic cement during drying and solidification is reduced, it is possible to prevent the shrinkage from causing cracks and lowering the adhesive strength.

<Second Invention> Since the downlight is buried in the ceiling, heat is generally apt to be trapped, and the halogen light bulb which is the light source rises to a high temperature. However, this halogen bulb is according to the first aspect of the invention, and it is possible to prevent the oxidation of the externally introduced wire from proceeding rapidly even when the temperature rises at a high temperature when the halogen bulb is lit, and the fixing strength is reduced. Can be suppressed.

Therefore, it is possible to extend the life of the downlight and prevent the halogen light bulb from dropping downward due to a decrease in fixing force.

<Third invention> Since the visible light reflecting infrared ray transmissive film is formed on the reflector of the downlight according to the second invention, of the light emitted from the light source to the reflector, the heat ray Since infrared rays are transmitted and released to the outside, overheating of the downlight can be prevented.

<Fourth Invention> In the fourth invention, since the infrared reflecting film is formed on the outer surface of the bulb of the halogen bulb which is the light source of the downlight according to the second or third invention, the filament in the bulb is formed. Infrared rays, which are the heat rays generated in step 2, can be efficiently reflected by the filament in the bulb by the infrared reflection film, and the filament can be heated to a high temperature.

Therefore, the luminous efficiency of the filament can be increased.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the first to third inventions of the present application will be described below with reference to FIG.
~ It demonstrates based on FIG.

FIG. 1 is a vertical sectional view showing the overall construction of an embodiment of the first invention of the present application.
Inside the glass bulb 2 is, for example, a vertical filament 3
Is sealed together with a halide and a rare gas, and one end of the bulb 2 is pinched off to form a flat sealing end 2a.

A pair of left and right molybdenum foils 4a and 4b in the figure are embedded in the sealing end 2a. The molybdenum foils 4a and 4b have filaments 3 at the upper ends in the figure.
While being electrically connected to the upper and lower ends in the figure, a pair of left and right outer lead wires 5a and 5b made of molybdenum are connected to the respective end portions in the figure, and the tips of the outer wells 5a and 5b are connected. The portion extends from the sealed end portion 2a to the outside in an airtight manner.

On the other hand, the valve 2 has its sealing end portion 2a inserted concentrically from the opening end into a base 6 which is a bottomed cylindrical die, and further, refractory powder is mixed in the base 5. The base 6 is fixed to the outer surface of the sealing end 2a by filling the heat-resistant inorganic cement 7 described above.

The base 6 has, for example, two pairs of nickel-made power receiving pins 8a and 8b planted on the outer surface of the bottom thereof, and the inner ends of the power receiving pins 8a and 8b are provided with a pair of outer wells 5a and 5b. The outer ends are electrically connected. Therefore, the outer end portions of the pair of outer wells 5a and 5b are entirely covered with the heat-resistant inorganic cement 7 to be shielded from the outside air.

The heat-resistant inorganic cement 7 has a particle size of 10
The refractory powder A having a small particle size of ˜20 μ and the refractory powder B having a large particle size of 50 to 70 μ are mixed, and the mixing ratio B / A is set to 1.5 to 2.5.

That is, in this heat-resistant inorganic cement 7, since the particles B having a small particle size are filled in the gaps between the particles A having a large particle size of the refractory powder, the denseness between these particles is improved and the ventilation is improved. However, the contact (fixing) force increases. This is a new finding obtained through experiments, and further, when the mixing ratio B / A is set to less than 1.5, the shrinkage amount of the heat-resistant inorganic cement 7 at the time of drying and solidifying increases and cracks occur. On the other hand, when the mixing ratio B / A exceeds 2.5, a new finding was obtained that the fixing force is lowered.

Therefore, according to the present embodiment, it is possible to suppress the occurrence of cracks due to the shrinkage of the heat-resistant inorganic cement 7 during the drying and solidification, and to suppress the decrease in the adhesive strength. Further, even when the halogen bulb 1 is heated to about 350 ° C. when it is turned on, the heat-resistant inorganic cement 7 has a high degree of denseness, so that the air permeability is low, and the temperature rise of the pair of outer wells 8a, 8b rapidly increases. Lamp oxidation can be suppressed and the lamp life can be extended.

FIG. 2 is a vertical sectional view of an embodiment of the second invention of the present application, in which the downlight 11 is a ceiling plate 12.
It is buried in a room, etc. to illuminate below the ceiling.
The light source is characterized in that the halogen bulb 1 according to the first embodiment of the first invention is assembled.

That is, the downlight 11 is a ceiling plate 1.
The opening end of the envelope 13 having a cylindrical shape with a lid is inserted and fixed in the mounting port 12a of No. 2, and the envelope 13 has a socket 14 for power supply fixed to the center of the inner surface of the lid, while A hemispherical reflector 15 is concentrically incorporated inside.

The reflecting plate 15 has a visible light reflecting infrared ray transmitting film 15b which reflects visible light and transmits infrared rays on almost the entire inner peripheral surface thereof. The open end of the reflector 15 is supported by the inner peripheral edge of the decorative frame 16, and the decorative frame 1
The outer peripheral edge portion of 6 is fixed to the opening peripheral edge portion of the mounting port 12 a of the ceiling plate 12.

A center hole 15a is formed in the center of the reflection plate 15, the base 6 of the halogen bulb 1 is inserted into the center hole 15a, and a pair of power receiving pins 8a and 8b are inserted into the socket 1.
4 into the pin hole and insert the halogen bulb 1 into the socket 14
Is electrically and mechanically connected to.

According to this embodiment, when the halogen bulb 1 is turned on, the temperature rises to a high temperature, and the halogen bulb 1 is buried in the ceiling.
Since the heat is collected, the halogen bulb 1 is heated to a considerably high temperature when it is turned on. However, as described above, the halogen bulb 1 does not reduce the adhesive strength of the heat-resistant inorganic cement 7 even when the temperature is raised to a high temperature, so that the bulb 2 can be prevented from falling off the base 6 and the temperature rise due to the high temperature rise. Since the lamp life can be extended by suppressing the rapid oxidation of the pair of outer wells 5a, 5b, the life of the downlight 11 can be extended.

Further, the reflection plate 15 transmits infrared rays of heat rays of the light emitted from the halogen bulb 1 and radiates the infrared rays to the outside.
It is possible to prevent the downlight 11 from overheating.

FIG. 3 is a longitudinal sectional view of an essential part of an embodiment of the third invention of the present application, in which the halogen bulb 21 is replaced with the halogen bulb 1 of the downlight 11 shown in FIG. This halogen bulb 21 is characterized in that an almost entire outer peripheral surface of the bulb 2 of the halogen bulb 1 shown in FIGS. 1 and 2 is coated with an infrared reflection film 22 that reflects infrared rays. Otherwise, the halogen bulb 21 shown in FIG. Since it is the same as the light bulb 1,
In FIG. 2, the same parts as those shown in FIG. 1 are designated by the same reference numerals and omitted.

When the halogen bulb 21 is turned on, infrared rays, which mainly serve as a heat source, are radiated from the filament 3 along with visible light and the like, but the infrared rays are efficiently radiated to the inside by the infrared reflection film 22, so that the filament 3 is heated to a high temperature. The temperature can be raised to.

Therefore, the luminous efficiency of the filament 3 can be improved.

[0037]

As described above, the first invention of the present application is
Since the denseness of the heat-resistant inorganic cement has been improved and the air permeability has been reduced, it is possible to suppress rapid oxidation of the externally introduced wire that is oxidized through the air permeability of this heat-resistant inorganic cement due to a high temperature rise when the halogen bulb is lit. ..

Further, since it is possible to suppress the occurrence of cracks due to shrinkage during drying and solidification of the heat resistant inorganic cement,
It is possible to suppress a decrease in the adhesive strength of the heat-resistant inorganic cement and prolong the lamp life.

Further, in the second invention of the present application, since the halogen bulb of the first invention is applied to a downlight which is generally prone to heat, the downlight is generated despite the high temperature rise when the halogen bulb is lit. As a result, the life can be extended.

Further, since it is possible to prevent the fixing force of the heat-resistant inorganic cement from being lowered, it is possible to prevent the valve from falling off the base.

Further, in the third invention of the present application, since the visible light reflecting infrared ray transmitting film is formed by the reflecting plate of the downlight according to the second invention, infrared rays of heat rays of the incident light to the reflecting plate are reflected. Since it passes through the plate and radiates heat, overheating of the downlight can be prevented.

Further, in the fourth invention of the present application, since the infrared ray reflecting film is formed on the outer peripheral surface of the bulb of the halogen light bulb of the second or third aspect of the invention, infrared rays emitted from the filament are reflected by the infrared ray reflecting film. The temperature can be raised to a high temperature by returning to the filament again, and the luminous porosity of the filament can be increased.

It can be extended exponentially.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the overall configuration of a halogen light bulb according to a first invention of the present application.

FIG. 2 is a partial vertical sectional view of an embodiment of the second invention of the present application.

FIG. 3 is a longitudinal sectional view of an essential part of an embodiment of the third invention of the present application.

[Explanation of symbols]

 1,21 Halogen bulb 2 Bulb 3 Filament 4a, 4b Molybdenum foil 5a, 5b Pair of outer wells (external lead-in wire) 6 Base 7 Heat-resistant inorganic cement 11 Downlight 12 Ceiling board 14 Socket 15 Reflector 22 Infrared reflective film

Claims (4)

[Claims] 1. A molybdenum external introduction wire connected to the filament is hermetically extended from a sealing end of a valve containing a filament, and the sealing end of the valve and the external introduction are introduced into a base. While inserting the outer end of the wire,
In a halogen bulb in which a heat-resistant inorganic cement mixed with refractory powder is filled and a base is fixed to the sealing end of the bulb, the heat-resistant inorganic cement is a refractory powder A having a small particle size of 10 to 20 μ, A halogen light bulb characterized by being mixed with a refractory powder B having a large particle size of 50 to 70 μm and having a mixing ratio B / A set to 1.5 to 2.5. 2. A downlight in which the base of the halogen light bulb according to claim 1 is provided on a reflector and is embedded in a ceiling. 3. The downlight according to claim 2, wherein a visible light reflecting infrared ray transmitting film is formed on the reflecting plate. 4. The downlight according to claim 2, wherein an infrared reflection film for reflecting infrared rays is formed on the outer surface of the bulb.