JPH09106788A - Halogen electric bulb - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a halogen electric bulb wherein reflected infrared energy can be efficiently utilized as a whole, by combining an infrared reflecting film formed into a tubular bulb having a cylindrical shape, an oval shape or the like with a filament. SOLUTION: There are provided a tubular bulb 1 having a sealed part on one end thereof, a halogen enclosed in the bulb, a filament 3 arranged substantially along the axis of the bulb, and an infrared reflecting film 9 formed on an outer surface or an inner surface of the bulb. Construction is made so that infrared rays emitted from the filament 3 may be reflected and heat the filament 3 and that a current reduction rate of a lamp current may be 1.0% or above. There are also provided internal lead wires 4a, 4b connected to both ends of the filament and a base 7 disposed on the sealed part.

Description

Detailed Description of the Invention

[0001]

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

[0002]

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

FIG. 4 is a partially cutaway sectional front view showing a conventional light bulb. Reference numeral 41 in the figure denotes a spherical bulb, and an infrared reflection film 42 is formed on the surface of the bulb. In addition, a filament 43 of a double or triple coil is arranged inside the valve 41. In the case of a spherical bulb, the infrared rays reflected by the infrared reflection film and returned to the filament are concentrated at almost one point in the center of the bulb.
It is better to make the total filament length as short as possible.

Further, in the filament, a filament wire is wound 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 wires. Good. That is, it is better to reduce the coil pitch D.

In this conventional example, the gap ratio s is 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 total filament length. Therefore, the gap ratio s is 0.3 or less. That is, the smaller the void ratio s of the filament, the more
There is less infrared light passing through the gap. further,
Since the entire length of the filament is shortened, it becomes easy to receive the infrared rays that are concentrated and reflected at one point, and eventually the amount of infrared energy 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 and energy is saved.

[0007]

However, even if the void ratio s is set to 0.3 or less as described above, there are cases where infrared rays are not reflected efficiently depending on the performance of the infrared reflecting film formed on the bulb. In some cases, the desired amount of infrared energy cannot be absorbed.

Moreover, when a tubular valve having a cylindrical or elliptical shape is used as the bulb on which the infrared reflecting film is formed, the infrared rays reflected by the infrared reflecting film and returned to the filament are spherical bulbs. Instead of focusing on one point like the filament, it is returned over the entire length of the filament, so if the filament length is relatively short as in the conventional example, the amount of infrared energy absorbed will increase. It is difficult to do.

Therefore, in the present invention, a halogen bulb capable of efficiently utilizing the infrared energy reflected as a whole by efficiently combining the infrared reflecting film formed on a cylindrical bulb such as a cylindrical shape or an elliptic shape with the shape of a filament. The purpose is to provide.

[0010]

According to the invention of claim 1, a cylindrical valve having a sealing portion at one end; a halogen enclosed in the valve; a filament and a valve arranged substantially on the axis of the valve. Current that has an infrared reflection film formed on the outer or inner surface of the lamp, reflects infrared rays emitted from the filament to heat the filament, and the current reduction rate of the lamp current is 1.0% or more. Reducing means;
It is provided with internal lead wires connected to both ends of the filament; and a base provided in the sealing portion.

Here, the current reduction rate is (1- (A1 / A
0)) * 100 (%), A0 indicates the lamp current when the infrared reflecting film is formed on the bulb, and A1 indicates the lamp current when the infrared reflecting film is not formed.

The clearance rate s is defined based on the current reduction rate shown in FIG. 3, but may be any value as long as the reduction rate is 1.0 or more. That is, the current reduction rate increases as the gap ratio s approaches 0. This is because the use of an infrared reflective film having relatively good performance and the relatively small coil pitch D enhances the reflection efficiency to the filament. At the same time, the amount of infrared energy that passes through the gap between the filaments is reduced, so that the amount of infrared energy that returns to the filament is increased. As a result, the current reduction rate is increased, the current supplied from the outside is small, and energy is saved.

That is, the graph of the current decrease rate of FIG.
It is considered that the vertical movement of the vertical axis of FIG. Therefore, if the performance of the infrared reflecting film is improved, more infrared rays can be reflected to the filament, and if the shape of the filament is optimized, the current reduction rate becomes large and a larger power saving effect can be expected. .

Therefore, in the present invention, the current decrease rate is 1.
The shape of the infrared reflection film and the filament having the performance of 0% is selected.

A preferred range of the void ratio s is a range of more than 0.3 and 0.7 or less. This is because the void ratio s is 0.
When the number is 3 or less, the total length of the filament is shortened, and the infrared rays reflected by the tubular bulb having the infrared reflection film are returned along the entire length of the filament.
It cannot be fully absorbed in the filament full length direction. Further, when the void ratio s is 0.3 or less, it becomes difficult to form the filament into a coil well, which is not suitable for mass production. Further, when the gap ratio s exceeds 0.7, the coil pitch D increases and more infrared rays pass through the gaps between the filaments. As a result, the current reduction rate decreases, and the infrared rays are reflected back by the infrared reflecting film. It cannot absorb much infrared rays.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the halogen bulb of the present invention will be described with reference to FIGS.

FIG. 1 is a side view of a halogen bulb. In the figure, reference numeral 1 is a cylindrical bulb made of quartz or hard glass, and has a cylindrical shape. One end of this valve 1 is sealed and cut, and the other end is formed with a crushed seal portion 2. The tubular valve may be elliptical or the like.

The current reducing means has a filament arranged substantially on the axis of the bulb and an infrared reflecting film formed on the outer or inner surface of the bulb, and has a current reduction rate of 1.
It is configured to be 0% or more.

The infrared reflecting film 9 is formed on the inner surface or the outer surface of the bulb 1 and is made of a material having a relatively good performance that allows visible light to pass therethrough and reflects most of infrared light.

The filament 3 is formed by winding a filament wire in a coil shape, is formed into a double coil, and is disposed inside the valve 1. Further, 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 adjacent wire strands in the coiled filament wire is D, the clearance ratio s (= 1-d / D) exceeds 0.3 and is 0.7 or less.
The filament 3 is disposed in the valve 1 in a state where the coil axis of the filament 3 is substantially aligned with the central axis of the valve 1, and both ends thereof are connected to the support wires 4a and 4b also serving as lead wires which are internal lead wires. .

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

Further, the bead glass 5 in the bulb 1 is
An anchor wire 8 is planted, and the anchor wire 8 holds a substantially middle portion of the filament 3. The bulb 1 is filled with rare gas and halogen to form a halogen bulb.

[0023]

According to the first aspect of the present invention, the current reducing means has a filament disposed substantially on the axis of the bulb and an infrared reflecting film formed on the outer or inner surface of the bulb.
The infrared rays emitted from the filament are reflected to heat the filament, and the current reduction rate of the lamp current is set to 1.0% or more, so that much infrared energy can be efficiently absorbed by the entire filament. Yes, you can save energy.

[Brief description of the drawings]

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

FIG. 2 is a diagram for explaining the primary coil of the filament.

FIG. 3 is a characteristic diagram similarly showing a current decrease rate.

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

[Explanation of symbols]

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

Claims (1)

[Claims] 1. A cylindrical bulb having a sealing portion at one end; a halogen enclosed in the bulb; a filament arranged substantially on the axis of the bulb and an infrared reflection film formed on the outer or inner surface of the bulb. And a current reducing means configured to reflect infrared rays emitted from the filament to heat the filament, and a current reduction rate of the lamp current is 1.0% or more; connected to both ends of the filament. A halogen light bulb, comprising: an internal lead wire; and a base provided in a sealing portion.