JPH10188920A - Bulb with reflecting mirror, and luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an electric bulb with a reflector, which can lower or prevent the generation of cracks due to abnormal temperature rise of an adhesive, by reducing diameter of a fitting hole of a reflector, and reducing an annular clearance between the fitting hole and a bulb sealing part, and filling inside of this small annular clearance with the adhesive. SOLUTION: In a bulb 1 with reflector, a single ended tungsten halogen lamp 2 is concentrically housed in a bowl-shaped dichroic mirror 3, and a sealing part 2b of a glass bulb 2a of the tungsten halogen lamp 2 is concentrically inserted into a fitting hole 5 of a neck part 4 as a supporting cylinder for the dichroic mirror 3. Inside of an annular clearance between the fitting hole 5 and the sealing part 2b is filled with the adhesive 6 such as cement so as to fix both them. Diameter D of the fitting hole is set at 115% or less of the maximum width W of the sealing part 2b of the tungsten halogen lamp 2. When voltage is applied across a pair of power feed pins 10a, 11b of the tungsten halogen lamp 2, and a filament 7 is electrified for light emission, emitted light is transmitted through the glass bulb 2a, and enters an infrared ray reflecting film 11 provided in the outer surface of the glass bulb 2a.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflector-equipped bulb and a lighting apparatus in which a bulb such as a halogen lamp is mounted on a reflector.

[0002]

2. Description of the Related Art Conventionally, an example of this type of bulb with a reflector is disclosed in Japanese Utility Model Laid-Open No. 55-68206. This reflector-equipped light bulb has a sealing portion formed at one end of a light bulb having an outer diameter of about 12 mm, and the sealing portion is attached to an outer surface thereof with an adhesive applied to a mounting hole in a neck portion of the reflector. And fixed with an adhesive.

[0003]

However, in the mounting hole of the reflector having such a conventional size, a sealing portion of a bulb having a diameter smaller than that of a conventional bulb, for example, having a bulb outer diameter of about 9 mm, is provided. When inserted and fixed with adhesive, the insertion hole in the neck part is relatively large compared to the outside diameter of the valve,
The annular gap between the mounting hole and the sealing portion becomes excessive. For this reason, when the gap is filled with the adhesive, there is a problem that the adhesive drips and adheres to the bulb side of the electric bulb, thereby causing a defective product.

Further, since the annular gap between the mounting hole of the reflector and the sealing portion of the bulb becomes relatively large, when the heat generated in the filament of the bulb convects in the reflector, a part of the heat is generated. However, the amount of heat applied to the adhesive at the neck is large. For this reason, there is a problem that the temperature of the adhesive rises abnormally, cracks and the like occur, and the fixing strength for fixing the bulb sealing portion to the neck portion of the reflector decreases.

Accordingly, the present invention has been made in view of such circumstances, and an object of the present invention is to provide an adhesive filled in an annular gap between a mounting hole of a reflector and a bulb sealing portion inserted into the mounting hole. It is an object of the present invention to provide a reflector-equipped light bulb with a reflector and a lighting apparatus capable of reducing or preventing dripping of the adhesive on the outer surface of the light bulb, and reducing or preventing the occurrence of cracks due to abnormal temperature rise of the adhesive.

[0006]

According to the first aspect of the present invention,
A light-transmitting hermetic container having a sealing portion at one end, and a light bulb comprising a filament disposed in the container;
A reflector having a neck portion having a sealing portion mounting hole formed within 115% of a maximum width of the bulb sealing portion and a reflecting surface for reflecting light from the bulb; and an outer surface of the bulb sealing portion. An adhesive filled in a gap between the mounting hole of the reflector and the mounting hole of the reflecting mirror.

According to this invention, since the diameter of the mounting hole of the reflector is reduced to 115% or less of the maximum width of the bulb sealing portion, the annular gap between the mounting hole and the bulb sealing portion is reduced. Can be reduced.

Therefore, the amount of the adhesive to be filled in the small annular gap can be reduced and the weight thereof can be reduced, so that the adhesive is dripped and adhered to the bulb side, and the occurrence of defective products is reduced. Or can be prevented.

In addition, since the annular gap between the mounting hole of the reflector and the bulb sealing portion is reduced, when heat generated from the bulb convects in the reflector, a part of the heat is generated in the annular gap. The amount of heat applied to the adhesive can be reduced. For this reason, it is possible to reduce or prevent the occurrence of cracks due to abnormal temperature rise of the bulb sealing portion.

The invention according to claim 2 is characterized in that the maximum width of the sealing portion of the electric bulb is approximately 9 mm.

According to the present invention, in addition to the function and effect of the first aspect of the present invention, since the outer diameter of the sealed portion of the airtight container of the light bulb is small, the diameter of the mounting hole of the reflecting mirror into which the sealed portion is inserted is reduced. The reflection surface around the mounting hole can be enlarged by reducing the size. For this reason, the center luminous intensity can be improved.

The invention according to claim 3 is characterized in that the reflecting mirror has an infrared transmitting visible light reflecting film which reflects visible light and transmits infrared light on a reflecting surface thereof.

According to this invention, in addition to the functions and effects of any one of claims 1 and 2,
Since the infrared transmitting visible light reflecting film is formed, heat generated in the filament of the bulb can be radiated from the infrared transmitting visible light reflecting film to the outside of the reflecting mirror. That is, heat dissipation can be improved.

According to a fourth aspect of the present invention, there is provided a light-transmitting hermetic container having a sealing portion at one end and a light bulb including a filament disposed in the container; A reflector having a neck portion having a sealing portion mounting hole formed within 115% and a reflecting surface for reflecting light from the bulb; and a gap between the outer surface of the bulb sealing portion and the mounting hole of the reflector. And an infrared-reflective film formed on at least one of the inner and outer surfaces of the airtight container of the bulb and transmitting visible light and reflecting infrared light.

According to the present invention, in addition to the function and effect of the first aspect of the present invention, since the infrared reflecting film is formed on at least one of the inner and outer surfaces of the airtight container of the bulb, the infrared ray generated by the filament of the bulb is formed. Is reflected by the infrared reflecting film of the airtight container, is returned to the filament again, and is heated, so that the luminous efficiency of the bulb can be improved.

[0016] The invention according to claim 5 provides the invention according to claims 1 to 4.
And a device main body provided with a socket electrically connected to the light bulb.

According to the present invention, since the light bulb with the reflector according to any one of claims 1 to 4 is provided, substantially the same operation and effect as those can be obtained.

[0018]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
A description will be given based on FIG. In these figures, the same or corresponding parts are denoted by the same reference characters.

FIG. 1 is a longitudinal sectional view of a reflector-equipped light bulb 1 according to a first embodiment of the present invention. In this figure, a reflector-equipped bulb 1 is a bulb, for example, a one-sided halogen lamp 2
Is concentrically housed in a bowl-shaped dichroic mirror 3,
Sealing part 2 of glass bulb 2a of this halogen lamp 2
b is a neck part 4 which is a support cylinder of the dichroic mirror 3
Are concentrically inserted into the mounting hole 5, and an annular gap between the mounting hole 5 and the sealing portion 2b is filled with an adhesive 6 such as cement or the like to fix them.

In the halogen lamp 2, an outer diameter of a bulb 2a made of quartz glass or the like, which is an airtight container, is formed to have a small diameter of, for example, about 9 mm, and one end of the bulb 2a is crushed in a diametrical direction to obtain a solid flat. The sealing part 2b is formed integrally. A covered cylindrical portion 2c is formed integrally and continuously with the sealing portion 2b.
At the top end (left end in FIG. 1) of the lid portion, a thin tube portion 2d remaining after sealing and cutting the exhaust pipe is integrally connected.

A filament 7 is built in the valve cylindrical portion 2c, and a pair of inner lead wires 8a, 8b electrically connected to both ends of the filament 7 are supplied to a pair of power supply via a pair of molybdenum foils 9a, 9b. Pins 10a, 10b
Is electrically connected to This pair of molybdenum foils 9
a, 9b are embedded in the sealing portion 2b,
The distal ends of Oa and 10b protrude from the sealing portion 2b to the outside in an airtight manner.

An infrared reflecting film 11 for transmitting visible light and reflecting infrared light is formed on the outer surface (or inner surface) of the bulb cylindrical portion 2c. This infrared reflection film 1
1 is titanium oxide (TiO ₂ ), tantalum oxide (Ta ₂₎
O ₅ ), zirconium oxide (ZrO ₂ ), zinc sulfide (Z
nS) and at least one high refractive index layer composed of silicon oxide (silica = SiO ₂ ), magnesium fluoride (MgF ₂ ), etc.
It is configured as a multilayer film having a total of 6 to 80 layers,
Such a multilayer laminated film has a function of reflecting infrared light by a multilayer interference effect and transmitting visible light.

On the other hand, the dichroic mirror 3 has an infrared transmitting visible light reflecting film 12 formed on the inner surface of a bowl-shaped glass or metal reflecting substrate to reflect visible light, while transmitting infrared light to the outside. The heat is dissipated to

An infrared reflecting film 14 similar to the infrared reflecting film 11 is provided on one of the inner and outer surfaces of the light emitting front glass 13 fitted in the light emitting opening of the dichroic mirror 3.
Has been adhered.

The dichroic mirror 3 has a cylindrical neck 4 projecting concentrically and integrally from the bottom of the bowl, and the inside of the neck 4 is formed in a mounting hole 5.
The diameter D of the mounting hole 5 is set within 115% of the maximum width W of the sealing portion 2b of the halogen bulb 2.

Since the reflector-equipped light bulb 1 is configured as described above, the pair of power supply pins 10a and 10a of the halogen lamp 2 are provided.
When a predetermined voltage is applied between 0b and the filament 7 is energized and emits light, the emitted light passes through the glass bulb 2a and enters the infrared reflection film 11 on the outer surface thereof.
Then, the visible light of the incident light is transmitted through the infrared reflective film 11 and emitted to the outside of the glass bulb a2,
The infrared rays are reflected and radiated again to the filament 7 to heat it. Thereby, the lamp efficiency of the halogen lamp 2 is improved. Further, ultraviolet rays can be cut or reduced.

Further, the infrared reflecting film 1 of the bulb 2a
Some of the infrared light that has passed through 1 is reflected again by the infrared reflective film 14 of the front glass 13 and returned to the halogen lamp 2 and its filament 7 to heat it, so that the lamp efficiency can be further improved. Note that one of the two infrared reflection films 11 and 14 may be omitted.

FIG. 2 shows the light distribution of the light bulb 1 with the reflecting mirror constructed as described above in comparison with that of the conventional example. In the figure, the curve A shows the light distribution of the present embodiment provided with the halogen lamp 2 in which the outer diameter of the bulb 2a is formed to be a small diameter of about 9 mm, and the curves B and C show the diameter of the bulb 2a of the present embodiment. 9 shows a light distribution of a conventional example including a conventional halogen lamp having a diameter larger than that of the bulb 2a.

As shown in FIG. 2, according to the bulb with reflector 1 according to the present embodiment, since the diameter of the halogen lamp 2 is reduced, the diameter of the mounting hole 5 of the neck 4 of the dichroic mirror 3 is reduced. Accordingly, the amount of reflected light can be increased by enlarging the reflection surface around the mounting hole 5 accordingly. Therefore, the central luminous intensity around the central optical axis O can be improved.

Further, since the diameter of the mounting hole 5 of the neck portion 4 is reduced, the annular gap between the mounting hole 5 and the sealing portion 2b of the halogen lamp 2 can be reduced. Therefore, it is possible to reduce or prevent the adhesive 6 filled in the annular gap from dripping and adhering to the halogen lamp 2 and becoming a defective product. Furthermore, since the amount of heat convection in the dichroic mirror 3 flowing into the annular gap is reduced, the occurrence of cracks due to an abnormal rise in the temperature of the adhesive 6 filled in the annular gap is not reduced. Can be prevented.

Further, the infrared rays generated by the filament 7 of the halogen lamp 2 are reflected by the infrared reflecting film 11 so as to return to the filament 7 side. For this reason, the filament 7 can be heated by infrared rays to improve the luminous efficiency, while the amount of heat radiated from the halogen lamp 2 into the dichroic mirror 3 can also be reduced.

On the other hand, since the infrared rays in the dichroic mirror 3 can be radiated to the outside by the infrared transmitting and visible light reflecting film 12, the amount of infrared rays in the dichroic mirror 3 can be reduced to lower the temperature. For this reason, the amount of heat convection in the dichroic mirror 3 is reduced, so that the amount of heat applied to the adhesive 6 in the neck portion 4 can be further reduced. Therefore, it is possible to further reduce the occurrence of cracks due to abnormal temperature rise of the adhesive 6.

FIG. 3 is an external front view of a reflector-equipped bulb 1A according to a second embodiment of the present invention, in which a pair of power supply pins 10a and 10b shown in FIG. There is a characteristic in that. According to this, the light bulb with reflector 1
Since A can be used in a place having a light bulb type socket, versatility can be improved.

FIG. 4 is a longitudinal sectional view of a main part of a lighting device 21 according to a third embodiment of the present invention. This lighting device 21 accommodates, for example, the reflector-equipped light bulb 1 shown in FIG. 1 in a fixture body 22, and inserts a pair of pins 10 a and 10 b of a halogen lamp 2 into a socket 23 provided in the fixture body 11. Power is supplied.

Since the lighting device 21 incorporates the above-described light bulb 1 with a reflecting mirror, the same operation and effect as the light bulb 1 with a reflecting mirror can be obtained, for example, the center luminous intensity around the central optical axis can be improved. Can be.

[0036]

As described above, the first aspect of the present invention is:
The diameter of the mounting hole of the reflector is set to 115 which is the maximum width of the bulb sealing portion.
% Or less, the annular gap between the mounting hole and the bulb sealing portion can be reduced.

Accordingly, the amount of the adhesive to be filled in the small annular gap can be reduced and the weight thereof can be reduced, so that the adhesive can be prevented from dripping and adhering to the bulb side and leading to defective products. Or can be prevented.

Further, since the annular gap between the mounting hole of the reflector and the bulb sealing portion is reduced, when the heat generated from the bulb convects in the reflector, a part of the heat is transferred into the annular gap. The amount of heat applied to the adhesive can be reduced. For this reason, it is possible to reduce or prevent the occurrence of cracks due to abnormal temperature rise of the bulb sealing portion.

According to the second aspect of the present invention, in addition to the function and effect of the first aspect, since the outer diameter of the sealing portion of the airtight container of the light bulb is small, the mounting of the reflecting mirror for inserting the sealing portion is provided. By reducing the diameter of the hole, the reflection surface around the mounting hole can be enlarged. For this reason, the center luminous intensity can be improved.

According to the third aspect of the present invention, in addition to the functions and effects of the first or second aspect, the reflecting surface of the reflecting mirror has
Since the infrared transmitting visible light reflecting film is formed, heat generated in the filament of the bulb can be radiated from the infrared transmitting visible light reflecting film to the outside of the reflecting mirror. That is, heat dissipation can be improved.

According to the fourth aspect of the invention, in addition to the functions and effects of the first aspect, since the infrared reflecting film is formed on at least one of the inner and outer surfaces of the airtight container of the bulb, the filament of the bulb is formed. Is reflected by the infrared reflecting film of the airtight container, is returned to the filament, and is heated, so that the luminous efficiency of the bulb can be improved.

According to the fifth aspect of the present invention, since the reflector-equipped light bulb according to any one of the first to fourth aspects is provided, substantially the same operation and effect can be obtained.

[Brief description of the drawings]

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

FIG. 2 is a diagram showing a light distribution of the light bulb with a reflector shown in FIG. 1 in comparison with that of a conventional example.

FIG. 3 is an external front view of a bulb with a reflector according to a second embodiment of the present invention.

FIG. 4 is a longitudinal sectional view of a lighting device according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bulb with a reflector 2 Halogen lamp 2a Bulb of a halogen lamp 2b Sealing part of a halogen lamp 3 Dichroic mirror 4 Neck part of a dichroic mirror 5 Mounting hole of a dichroic mirror 6 Adhesive 7 Filament 12 Infrared transmission visible light reflection film 13 Front Glass 11, 14 Infrared reflective film 21 Illumination device 22 Instrument body 23 Socket

Claims (5)

[Claims] 1. A light-transmitting hermetic container having a sealing portion at one end and a light bulb including a filament disposed in the container; formed within 115% of the maximum width of the light bulb sealing portion. Reflector having a neck portion having a sealed portion mounting hole and a reflecting surface for reflecting light from the bulb; and an adhesive filled in a gap between the outer surface of the bulb sealed portion and the mounting hole of the reflector. And a light bulb with a reflector. 2. The bulb with a reflector according to claim 1, wherein the maximum width of the sealing portion of the bulb is approximately 9 mm. 3. The reflecting mirror according to claim 1, wherein an infrared transmitting visible light reflecting film for reflecting visible light and transmitting infrared light is formed on a reflecting surface of the reflecting mirror.
A light bulb with a reflector as described. 4. A light-tight hermetic container having a seal at one end and a light bulb comprising a filament disposed within the container; formed within 115% of the maximum width of the light bulb seal. Reflector having a neck portion having a sealed portion mounting hole and a reflecting surface for reflecting light from the bulb; and an adhesive filled in a gap between the outer surface of the bulb sealed portion and the mounting hole of the reflector. And an infrared reflecting film formed on at least one of the inner and outer surfaces of the airtight container of the light bulb and transmitting visible light and reflecting infrared light. 5. A light bulb with a reflector according to any one of claims 1 to 4; and a device main body provided with a socket electrically connected to the light bulb. Lighting equipment.