JPS58214269A - Halogen bulb for headlight - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a halogen light bulb for headlights, in which two main and sub filaments are provided parallel to the pulp axis, and a molybdenum cup for light distribution control is provided adjacent to the sub filament. It is.

This type of halogen bulb is used for car headlights.
It has already been widely used, and its main characteristics have already been defined in the IEC standards for ki4) and rogen light bulbs. Although it has been put into practical use so far and fully satisfies the efficiency and life span stipulated by the IEC standard, it has the following drawbacks.

That is, in this H4 halogen bulb, when the lamp is first lit after manufacture, especially when only the main filament is lit, a yellow substance is deposited on the inner surface of the bulb around the sub-filament, causing a so-called yellowing phenomenon. When yellowing occurs,
The light color becomes reddish, and the white light that is characteristic of halogen bulbs is lost. This yellowing substance aggregates in the coldest part of the halogen bulb as the bulb continues to be lit, but it takes quite a long time, from several hours to several tens of hours, for it to completely aggregate.

Also, this yellowing is very noticeable when the filament power is low, for example, 35W/
With 35W halogen bulbs, the yellow color lasts for a long time, and it is extremely difficult to quantify halogen bulbs with good light properties in practice.

The present invention has been made to eliminate these conventional drawbacks.
It is fC thing.

As a result of various studies, the inventors learned the following.

That is, the yellowing phenomenon is closely related to the temperature distribution of the pulp. If the temperature of the pulp is high enough, such a yellowing phenomenon will not occur.

For example, if the main filament and the sub-filament are turned on at the same time, the yellow color that appears once will disappear.

In addition, this yellowing is closely related to the manufacturing process of halogen light bulbs, and it is possible to reduce the yellowing by thoroughly vacuuming the lead-in wire and molybdenum cup, and carefully exhausting the pulp for a long time. It was Canada. However, even if such measures were taken, the yellow color could not be completely eliminated.

The cause of the yellow color is still not clear (Hega, trace amounts of oxygen remaining in the pulp combine with molybdenum, which is the constituent material of the lead wire and cup, and bromine, which is the filler gas).
It is estimated that oo2Br2 is generated. Completely removing such a small amount of oxygen from within the pulp causes extremely high costs.

In order to eliminate this yellowing phenomenon, the inventors considered using chlorine as a halogen, and found that by using chlorine in a limited range, this problem could be solved without adversely affecting the service life. was able to be completely resolved.

That is, the present invention uses 3.76X as a halogen gas.
The object of the present invention is to provide a new halogen bulb for headlights that completely eliminates the drawbacks of the above-mentioned bromine-filled bulbs by encapsulating 10 to 7.5×10 gram atoms of chlorine.

Embodiments of the present invention will be described below with reference to the drawings.

The figure shows the production of H4 halogen light bulbs. The main filament 1 and the side filaments 2 are installed parallel to the rung axis and spaced apart from each other.

A molybdenum cup 3 for controlling light distribution is installed adjacent to the sub-filament 2. The filament 1.2 is connected to a lead-in wire 4 made of molybdenum or a molybdenum-based alloy. It is made of pulp, quartz, or halogen-resistant hard glass, and contains an inert gas such as krypton and a trace amount of chlorine gas as the sealed gas.

A black light beam plate 6 is painted on the outer surface of the top of the pulp 5.

Example 1 In the Shinzo chlorine-containing halogen bulb shown in the figure, i2
vs O/5.5 WH4 halogen bulb I EC
The rated center value specified in the standard, that is, the power supply voltage 1
At 3.2V the main filament e s Vv', 1650
1m.

Using a filament coil that gives a secondary filament of 62W and 10001m, cH3cl and C,
Krypton gas containing an equal amount of HCl3 was used.

The amount of charged chlorine was controlled by changing the concentration of the CH2O2/CHCl3 mixed gas and the pressure of the charged gas.

The actual results are shown in Table 1.

As is clear from Table 1, the amount of chlorine enclosed is 3.75X
In the range of 10 gram atoms to 7.5 x 10 gram atoms, blackening did not occur until the next term of life, and blackening occurred in all products outside this range. and,
No yellow color occurred in all the tested ranges.

With the same amount of chlorine, a long culm life can be obtained due to high sealing pressure, but when the culm was filled with 4 atmospheres or more, some exploded during lighting. Although the lifespan is not specified in the IEC standard, the lifespan is 100 hours for the main filament and 2 hours for the secondary filament at a power supply voltage of 13.2V, which is common.
The lower limit of the sealing pressure for calculating the Q time is 1.6 atmospheres. Therefore, a suitable sealing pressure is between 1.5 and 4 atmospheres.

Example 2 A large number of 710 gen light bulbs having the same structure as in Example 1 were produced and compared with a conventional bromine-containing...rogen light bulb. These custom halogen bulbs have a main filament voltage of 69.5 to 69.5V when measured at a power supply voltage of 13.2V.

16ryo01rn sub-filament is 62W, 10501m
The secondary filaments were s2W and 1oso1m.

Enclosed chlorine amount (rj:, exlo is gram atom,
Krypton was sealed at 3 atm as an inert gas. When these halogen bulbs were tested for life, the occurrence of yellow color was 1.
There were no lights either.

Furthermore, a prototype rogen light bulb was made using the same filament coil as above and filled with approximately the same amount of bromine, and a lifespan test was conducted. Almost all of these) Rogen bulbs emit a pale yellow color when the main filament is first lit.

The above life test was conducted on 30 bulbs at a power supply voltage of 14V, and Table 2 shows that the chlorine-containing non-halogen bulb according to the present invention has a higher lifespan than the conventional bromine-containing halogen bulb. It can be seen that, although the average life expectancy is only slightly worrying, the dispersion has decreased significantly. This suggests that the trace amount of residual oxygen that causes the yellow color when bromine is included also affects the variation in lifespan.

Example 3 The NO-Rogen light bulb with the structure shown in the figure, which has a main filament of 35 W and 7001 m and a sub-filament of 35 W and 4401 m at a power supply voltage of 6.3 V, is not yet officially standardized by IEC, but is currently used in motorcycle headlights. It is being considered for use in The amount of chlorine sealed in a trial production of a non-rogen light bulb with the structure shown in the above-mentioned custom-made diagram is 3.75X1.
It was 0-7 gram atoms, and krypton was sealed as an inert gas at 3.5 atmospheres.

This Rogen bulb produced no yellow color and had an average lifespan of 147 hours for the main filament and 500 hours for the secondary filament.

On the other hand, a prototype lamp containing the same amount of bromine produced at the same time produced a striking yellow color.

Example 4 24V, 75/70WH4 specified in IEC standard
Using a filament coil that gives characteristics close to the upper limit filament power of the standard for halogen bulbs, that is, 85 to 20 V at a power supply voltage of 13.2 V, and the luminous flux as well, that is, 21851 m for the main filament and 22801 m for the auxiliary filament, as shown in the figure. A prototype lamp with the structure shown was fabricated. The amount of chlorine sealed was 7.5 x 10'-7 gram atoms, and 4 atm of krypton was sealed as an inert gas. This halogen bulb produced no yellow color and had an average life of 206 hours for the main filament and 520 hours for the secondary filament.

As explained above, the halogen bulb of the present invention has the best lifespan characteristics, and can completely solve the problem of the yellow color at the beginning of lighting, which was the problem with conventional bromine-containing halogen bulbs. The improvement effect is significant.

[Brief explanation of the drawing]

The figure is a front view of a Rogen light bulb, which is an embodiment of the present invention. 1... Main filament, 2... Sub-fillant, 3... Molybdenum cup, 4...
Incoming line, 5...valve.

Claims (1)

[Claims] (1) A main filament and a sub-filament are provided in the bulb parallel to the bulb axis, and the sub-filament is provided with a molybdenum cup for light distribution control close to the filament, and the main filament and the sub-filament have a structure connected to an internal lead-in line made of molybdenum or a molybdenum alloy, respectively, and the halogen bulb for headlights contains chlorine gas or inert gas as the sealed gas. 3.75 x (Sakaki) The pressure of the inert gas is measured at room temperature from 1.5 to 4 atm.