JPS5816597B2 - How to make light bulbs - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a light bulb, which includes a step of reducing conducting wires inside the light bulb, such as filaments, anchors, internal lead-in wires, etc., as a pretreatment for manufacturing the light bulb.

A light bulb has internal conductors such as filament, anchor,
If the internal lead-in wire is completely oxidized, poor contact may occur at the connecting part of the filament or the connection part with the internal conductor, and furthermore, impurity gas may be gradually released during lighting, causing the filament to become damaged. These phenomena, which cause wire breakage and blackening of the inside of the bulb, are particularly noticeable in special light bulbs such as halogen light bulbs, and are the cause of significantly shortening the life of the bulb.

In contrast, in the conventional light bulb manufacturing process, after the filament is fixed in the bulb, no special treatment is performed to remove oxides from the conductor wire, and in the process of slightly exhausting the bulb, it is placed in a forming gas. All I had to do was turn on the filament and perform a reduction process on the filament.

For this reason, it has not been possible to remove oxides from internal lead-in wires, anchors, etc. inside the light bulb.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a method for manufacturing a light bulb that includes a reduction treatment step that can remove oxides from the conductive wire inside the light bulb, which is a factor that deteriorates the characteristics of the light bulb.

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

FIG. 1 shows a schematic configuration diagram for explaining the method according to the present invention.

In the figure, 1 is a bulb of a light bulb, and a stem 2 is welded to the opening of the bulb 1.

A pair of internal lead-in wires 3 and 4 to be introduced into the bulb 1 are implanted in the stem 2.

An anchor 6 is provided in the middle of these internal lead-in wires 3 and 4 via a glass bead 5.

This anchor 6 supports a filament 7 provided between the tips of the internal lead-in wires 3 and 4.

Further, an exhaust pipe 8 is welded to the stem 2.

This exhaust pipe 8 is connected to an exhaust and gas filling device (not shown).

On the other hand, an annular electrode 9 is provided around the tube 1, and a high frequency power source 10 is connected between the electrode 9 and the internal lead-in wire 3.

This high frequency power supply 10 generates an output on the order of MHz.

In this case, the electrode 9 may be a cylindrical electrode surrounding the tube 1 as shown in FIG. 2, or one or more conductors or conductor rods may be arranged close to the tube 1 (not shown). Good too.

Further, the high frequency power source 10 may be connected between both the internal lead-in wires 3 and 4 and the electrode 9 as shown by the broken line in the figure.

In such a configuration, the inside of the tube 1 is first evacuated through the exhaust pipe 8, and then a reducing gas such as hydrogen or a forming gas mixed with hydrogen is fed into the tube 1.

In this state, high frequency power on the order of MHz is supplied from the high frequency power source 10 between the electrode 9 and the internal lead-in line 3.

In this way, inside the bulb 1, a conductor such as filament γ, internal lead-in wires 3, 4, anchors 6 and electrodes 9 generate a discharge due to the high frequency electric field, and the reduction action of activated hydrogen generated and the discharge The introduction line 3 of the part in a hydrogen atmosphere is
.

According to such a method, the oxidation of the conductive wire inside the bulb can be sufficiently reduced as a pretreatment for producing the bulb, so that the characteristics of the produced bulb can be improved, and in particular, the blackness of the tube wall can be improved. It is extremely effective in preventing oxidation.

By the way, in the manufacturing process of halogen light bulbs, if the conductive wire inside the light bulb was not subjected to reduction treatment, more than 70% of the light bulbs were blackened.

In contrast, in the present invention, as a specific example, the high frequency power supply, that is, the oscillator, has an oscillation frequency of 1 to 500 MHz, and an oscillation power of 5 W to 500 MHz.
IKW, no-load voltage (required to start discharging) 100V to 20
Use a gas in the KV range and keep the pressure of the forming gas sent into the bulb below 760 torr (atmospheric pressure) (the lower limit is 0.1 torr as long as there is gas in it).
As a result of conducting various reduction treatments under conditions of a discharge current of 50 mA to 5 A, it was found that the base ratio could be reduced to 3% or less without causing blackening.

Next, an example of a combination of the reduction treatment process ζ and other processes according to the present invention, that is, filament treatment and baking treatment using a gas flame, an electric heater, etc., will be explained with reference to the schematic diagram shown in FIG.

In FIG. 3, the same parts as those in FIG. ,4
A filament lighting device 15 powered by a commercial AC power source or a DC power source is connected between the two through coils 13 and 14.

Here, the capacitors 11 and 12 block the passage of commercial AC power or DC power of the filament lighting device 15, and the coils 13 and 14 block the passage of high frequency power of the high frequency power supply 10.

Further, the bulb 1 is housed in a baking oven 16 using an electric heater or a gas flame.

In such a configuration, first, the inside of the tube 1 is baked in the furnace 16 and evacuated.

``Then, a reducing gas such as hydrogen or forming gas is introduced.

In this state, high-frequency power is supplied from the high-frequency power supply 10 between the electrode 9 and the internal lead-in wires 3 and 4, and the inside of the tube is reduced in the same manner as described above.

In addition, at the same time or alternately, the filament lighting device 15
Commercial AC power or DC power is supplied to the filament 7 to heat the filament for lighting.

In this case, the functions of the capacitor 1L12 and the coils 13 and 14 prevent the mutual processes from influencing each other.

According to such a method, the filament treatment step can be efficiently combined with the reduction treatment step according to the present invention, which can greatly contribute to shortening the working time of the entire light bulb manufacturing process.

Next, an example of manufacturing a large number of light bulbs will be described with reference to the schematic configuration diagram shown in FIG. 4.

FIG. 4 shows the case where three light bulbs are manufactured at the same time, and the same parts as in FIG. 1 are given subscripts 1, 2, and 3.

In this case, each exhaust pipe 8 of the tube 1□, 1□, 13.

82 and 83 are connected to the common manifold 17.

This manifold 11 is connected to an exhaust and gas fill system (not shown).

Also, tube 10.1□, 13 light bulb 9□192 j 9
3 are commonly connected and connected to one output terminal of the high frequency power supply 10, and the tubes 1. , 'i2, 13 are commonly connected via capacitors 111, 112, 113, and connected to the other output terminal of the high frequency power supply 10.

Also, 1 tube each, if necessary. 12. High frequency blocking coil 13° in the internal lead-in wire of 13.

A filament lighting device (not shown) is connected via 141, 132, 142, 133, 143.

Therefore, in such a configuration, if high frequency power is supplied from the high frequency power source 10 to each of the bulbs 1□, 12, and 13 in the above-described procedure, the oxidation of the conductive wire inside each bulb can be simultaneously reduced.

It should be noted that the present invention is not limited to the above-mentioned embodiments, but can be implemented with appropriate modifications within the scope without changing the gist.

For example, in the embodiments described above, a light bulb having a stem has been described throughout, but the present invention can also be applied to a pinch seal type light bulb.

Further, by inserting an impedance circuit such as a coil, a capacitor, or a resistor between the high-frequency power source 10 and the electrode 9 or the internal lead-in wires 3 and 4, the discharge state can be stabilized.

In this case, if the impedance of this circuit is made variable, the discharge state can be controlled.

Furthermore, the oscillation element in the high-frequency power source may be a vacuum tube, a transistor, a power FET, or any other element, and may be combined in any combination such as single, multiple parallel, series bush-pull, complementary, etc.

Further, the oscillation circuit may be any circuit such as Hartley, Colpitts, Clapp, etc., any modification thereof, or a combination of an oscillator and a high frequency power amplifier.

As described above, according to the present invention, it is possible to effectively remove oxides from the conductive wire inside the light bulb, which is a factor that deteriorates the characteristics of the light bulb.

[Brief explanation of drawings]

1 to 4 are layout diagrams showing each side of the apparatus used in the present invention. 1...Tube, 2...Stem, 3, 4...Internal lead-in wire, 5...Glass bead, 6...Anchor, 7...
・Filament, 8... Exhaust pipe, 9... Electrode, 10
...High frequency power supply, 11.12... Conan? , 13
．． 14... Coil, 15... Filament lighting device, 16... Baking furnace, 17... Manifold.

Claims (1)

[Claims] 1. As a pretreatment for manufacturing a light bulb, a reducing gas is introduced into the bulb constituting the bulb, and high-frequency power is supplied between the conductor inside the bulb and the electrode arranged outside the bulb to make the tube. A method for manufacturing a light bulb, comprising a step of generating electric discharge inside the bulb and reducing the conductive wire inside the bulb.