JP3285148B2 - Halogen bulb - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a halogen lamp having an infrared reflecting film.

[0002]

2. Description of the Related Art Conventionally, a light bulb having an infrared reflecting film is disclosed in, for example, Japanese Patent Application Laid-Open No. 56-82564 (prior art)
It is described in. This light bulb will be described with reference to FIG.

FIG. 4 is a partially cutaway front view showing a conventional light bulb. In the figure, reference numeral 41 denotes a spherical bulb, on which an infrared reflecting film 42 is formed. A double or triple coil filament 43 is provided inside the bulb 41. In the case of a spherical bulb, the infrared ray reflected by the infrared reflection film and returned to the filament is concentrated at almost one point at the center of the bulb.
It is better to make the overall length of the filament as short as possible.

Further, the filament is formed by winding a filament wire in a coil shape, and it is better to prevent infrared rays from passing through a gap formed by a distance (coil pitch) D between centers of adjacent filament wires. Good. That is, it is better to reduce the coil pitch D.

In this conventional example, the gap ratio s is expressed as s using the coil pitch D of the filament and the diameter d of the filament wire.
= 1-d / D and the coil pitch D is reduced to shorten the overall filament length. Therefore, the gap ratio s is 0.3 or less. That is, the smaller the gap ratio s of the filament is,
Infrared rays that pass through the gap are reduced. further,
Since the total length of the filament is shortened, it is easy to receive the infrared rays which are concentrated and reflected at one point, and eventually, the energy amount of the infrared rays absorbed by the entire filament is increased. And while the infrared energy received by the filament raises its operating temperature,
It reduces the amount of energy required to heat the filament. As a result, the power consumed to obtain the same amount of light output is reduced, saving energy.

However, when the void ratio s is set to 0.3 or less as described above, it is difficult to actually form the filament. Furthermore, when using a cylindrical valve in which the bulb on which the infrared reflective film is formed is cylindrical or elliptical, the infrared light reflected by the infrared reflective film and returned to the filament is, as in the case of a spherical bulb. Instead of being concentrated at one point of the filament, it is returned in the direction of the entire length of the filament. Therefore, in the case where the overall length of the filament is relatively short as in the conventional example, the amount of energy of infrared rays to be absorbed hardly increases. Things. Further, in the related art, there is no technique in which the gap ratio of the filament is regulated based on the current reduction rate.

Therefore, in the present invention, in a halogen lamp having an infrared reflecting film formed on a cylindrical bulb such as a cylindrical or elliptical bulb, the infrared energy reflected by defining the gap ratio of the filament and the current reduction ratio is determined. An object is to provide a halogen bulb that can be used efficiently.

According to the present invention, there is provided a halogen lamp comprising: a cylindrical quartz bulb having a sealing portion at one end; a halogen sealed in the bulb; When the pitch of the next coil is D, the gap ratio s
(= 1-d / D) being not less than about 0.50 and not more than about 0.66, and a double coil filament disposed substantially on the axis of the valve; and an anchor supporting a substantially intermediate portion of the filament. An infrared reflective film formed on the outer or inner surface of the bulb facing the filament; an internal lead connected to both ends of the filament; a bead glass for embedding and supporting the ends of the internal lead and the anchor wire. And a metal foil conductor electrically connected to the internal lead wire and embedded in the sealing portion; and a base provided in the sealing portion.

In the graph of the current reduction rate shown in FIG. 3, circles are points at which the experiment was performed, and the gap ratio s (=
1-d / D) are present at positions of about 0.50 to about 0.66, respectively, and the current reduction rate at that time is present at about 1.30% to about 2.17%.

[0008] When the gap ratio s is reduced, the total length of the filament is reduced, and in the cylindrical valve provided with the infrared reflecting film, the reflected infrared rays are returned along the entire length of the filament. Can not be absorbed. Further, it is difficult to form the filament in a coil shape, which is not suitable for mass production. On the other hand, if the gap ratio s is too large, the coil pitch D becomes large, so that more infrared light passes through the gap between the filaments. As a result, it is not possible to absorb much infrared light reflected and returned by the infrared reflecting film. For this reason, the current reduction rate is reduced.

Therefore, in the present invention, the positional relationship between the infrared reflective film formed on the bulb and the filament is specified, and the gap ratio s of the filament is set to about 0.50 or more and about 0.1 mm.
In the range of 66 or less, a substantially middle portion of the filament is supported by an anchor wire.

In the structure of the present invention, an infrared reflecting film is formed on the outer surface or inner surface of a cylindrical quartz glass, a metal foil is embedded in a sealing portion, and the sealing portion is disposed in a base. If you try to increase the porosity and increase the filament length,
Since there is a possibility that the filament is deformed, it is possible to provide a halogen lamp that is more easily manufactured by providing an anchor that supports a substantially intermediate portion of the filament.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a halogen lamp according to the present invention will be described with reference to FIGS.

FIG. 1 is a side view of a halogen lamp. In the figure, reference numeral 1 denotes a cylindrical valve made of quartz glass, which has a cylindrical shape. One end of the valve 1 is sealed and cut, and a crush seal portion 2 is formed at the other end. Note that the cylindrical valve may be elliptical or the like.

The infrared reflecting film 9 is formed on the outer surface or the inner surface of the bulb facing the filament except for the tip end side of the bulb, and has a relatively high performance which transmits visible light and reflects most of infrared rays. Have been.

Therefore, on the distal end side of the valve,
Since the infrared rays reflected from the section formed in the cross-sectional curve are reduced, the possibility of partially heating the filament is reduced. That is, the infrared rays reflected by the infrared reflection film 9 and returned to the filament are less likely to be concentrated at one point of the filament as in the case of a spherical bulb, and are returned evenly over the entire length of the filament. is there.

The filament 3 is formed by winding a filament wire in a coil shape. The filament 3 is formed in a double coil and is disposed in the bulb 1. The shape of the filament 3 is shown in FIG. As shown, when the diameter of the filament wire of the primary coil is d and the distance (coil pitch) between the centers of the adjacent wires in the coiled filament wire is D, the gap ratio s (= 1-d / D) is not less than 0.50 and not more than about 0.66, and the current reduction rate is 1.30.
The configuration is as described above. The filament 3 is disposed in the bulb 1 with the coil axis substantially aligned with the central axis of the bulb 1, and both ends of the filament 3 are connected to support wires 4a and 4b serving as internal leads, which also serve as lead wires. .

The support wires 4a and 4b penetrate the bead glass 5 and are guided to the crushed sealing portion 2, and the metal foil conductor 6 made of molybdenum or the like sealed in the crushed sealing portion 2.
a, 6b. These metal foil conductors 6a,
6b is connected to the base 7 via an external lead wire (not shown).

The bead glass 5 in the bulb 1 includes:
An anchor wire 8 is implanted, which anchors the substantially intermediate portion of the filament 3. Note that a rare gas and halogen are sealed in the bulb 1 to constitute a halogen bulb.

[0017]

According to the present invention, the infrared reflecting film is formed on the bulb surface so as to face the filament disposed substantially on the axis of the bulb and the void ratio of the filament is defined. The infrared light reflected back to the filament is not concentrated at one point of the filament as in the case of a spherical bulb, but is returned evenly along the entire length of the filament. Further, since a filament having a length such that a large amount of infrared energy is efficiently absorbed by the entire filament is formed, energy can be saved.

Further, in the present invention, an infrared reflecting film is formed, a metal foil is embedded in a sealing portion, and the sealing portion is provided on a base. If an infrared reflective film is formed on the bulb tip side, local heating of the filament on the bulb tip side becomes large. This heating increases as the gap ratio of the filament decreases. On the other hand, when the gap ratio is large, local heating of the filament is stopped, but infrared rays that pass through the gap between the filaments and reach the metal foil increase. When infrared rays reaching the metal foil increase, there is a problem that the metal foil overheats,
Although it becomes necessary to cool the metal foil, the above configuration allows the metal foil to be cooled.

Further, according to the present invention, the gap ratio s of the filament is in a range of about 0.50 to about 0.66, and an infrared reflecting film is formed on an outer surface or an inner surface of the bulb facing the filament. Since the metal foil electrically connected to the internal lead wire is embedded in the sealing portion, the product can be manufactured without the above-mentioned problem.

[Brief description of the drawings]

FIG. 1 is a side view of a halogen lamp showing one embodiment of the present invention.

FIG. 2 is a diagram illustrating a primary coil of a filament.

FIG. 3 is a characteristic diagram showing a current reduction rate.

FIG. 4 is a partially cutaway front view showing a conventional light bulb.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Cylindrical valve 3 ... Filament 4a, 4b ... Support wire 7 ... Base 9 ... Infrared reflective film

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-1-206558 (JP, A) JP-A-9-106788 (JP, A) JP-A-62-246246 (JP, A) JP-A-54- 124587 (JP, A) JP-A-55-98459 (JP, A) JP-A-56-7259 (JP, U) Patent 3164144 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) ) H01K 1/14 H01K 1/32

Claims (1)

(57) [Claims] A cylindrical quartz bulb having a sealing portion at one end; a halogen sealed in the bulb; a diameter of the filament wire d; a pitch of the primary coil D;
Then, the gap ratio s (= 1−d / D) becomesAbout 0.50 or less
0.66 or lessFormed almost on the axis of the valve
A double coil filament disposed;An anchor wire supporting a substantially intermediate portion of the filament;  On the outer or inner surface of the bulb facing the filament
An infrared reflective film formed; and internal leads connected to both ends of the filament;Embed and support the ends of internal leads and anchor wires
Bead glass;  It is electrically connected to the internal lead wire and sealed
A metal foil conductor embedded in the sealing portion; and a base provided in the sealing portion.