JPH0562653A - Incandescent lamp and its manufacture - Google Patents

Abstract

PURPOSE:To provide an incandescent lamp excellent in adhesion and the durability with the base, and preventing the penetration of flux at a low cost and effectively manufactured. CONSTITUTION:The fitting portion of a bulb fitting portion 11 and a base 20 is bonded by means of silicon resin adhesive composed of 15-25 percentage by weight of silicon resin, 82-72 percentage by weight of filler powder, and high temperature volatile solvent. Respective components are blended so as to prepare adhesive. Thereafter the adhesive is left in a closed vessel for 48 hours or longer. After the adhesive is applied to the shell inlet portion of the metal base, the metal base and the bulb fitting portion are fitted each other, and the adhesive is baked and hardened. Thereby the incandescent lamp is manufactured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an incandescent light bulb which has excellent adhesion strength to a base and its durability and prevents flux from penetrating, and a method for efficiently producing this incandescent light bulb at low cost. ..

[0002]

2. Description of the Related Art In a conventional incandescent light bulb, as shown in FIG. 4, a valve fitting portion 2 of a bulb 1 and a metal base 3 are fitted and bonded together via a phenol resin adhesive 4. ..

However, in the above-mentioned conventional incandescent light bulb, the adhesiveness of the phenolic resin adhesive 4 is deteriorated due to heat or ultraviolet ray deterioration at the end of the lighting life of the bulb 1, so that the bulb becomes a loose base, and There was a fear that it would fall.

Moreover, the phenolic resin adhesive used in the conventional incandescent light bulb needs to be stored in a low temperature stocker or the like, and if it is not used within 48 hours after the adjustment, natural curing proceeds and its fluidity However, the handling work requires careful handling.

Also, as a measure against the loose base, a technique of using a silicone resin adhesive instead of a phenol resin adhesive for adhesion of a base (Japanese Patent Application No. 1-76947).
Is proposed.

However, when an incandescent lamp is manufactured using a silicone resin adhesive, the cost, moldability,
Not only are there many restrictions in terms of adhesive strength, handling of the adhesive, mass productivity, etc., but also as shown in FIG.
The flux 5 may penetrate into the metal die 3 at the time of baking the die, and there is a problem that the lead wire 6 is easily broken due to the flux 5 when the bulb is turned on.

[0007]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of investigations for solving the problems in the above-described conventional incandescent light bulb and its manufacturing method.

Therefore, an object of the present invention is to provide an incandescent light bulb having excellent adhesion strength and durability for the base and preventing invasion of flux, and a method for efficiently manufacturing the incandescent light bulb at low cost. Especially.

[0009]

In order to achieve the above object, the incandescent light bulb of the present invention is such that the fitting portion of the bulb fitting portion and the metal base is 15 to 25% by weight of silicone resin and filler powder. It is characterized by being bonded by a silicone resin adhesive composed of 82 to 72% by weight and a high temperature volatile solvent.

The method of manufacturing an incandescent light bulb of the present invention is
After adjusting the silicone resin adhesive having the above composition ratio, leave it in a closed container at room temperature for 48 hours or more,
After applying this adhesive to the shell inlet of the metal base,
The metal base and the valve fitting portion are fitted to each other, and then the adhesive is baked and cured.

Further, in the method for manufacturing an incandescent light bulb of the present invention, after the silicone resin adhesive is applied to the shell inlet of the metal base, the thickness of the adhesive is reduced from the shell inlet of the metal base to the inner part. It is characterized in that the metal base and the valve fitting part are fitted to each other, and more preferably, a volatile solvent is added to the metal base, and then the adhesive is baked and cured. To do.

[0012]

According to the present invention, by optimizing the compounding composition of the silicone resin adhesive applied to the fitting part of the valve fitting part and the metal base, especially the mixing ratio of the high temperature volatile solvent, Adhesive strength of the applied incandescent bulb is 3N
m or more, and the durability of the adhesive does not decrease at the end of the valve life, not only can the loose base be eliminated, but the flux infiltration into the metal die can be effectively suppressed. it can.

Further, according to the method for manufacturing an incandescent light bulb of the present invention, the silicone resin adhesive is applied in a closed container at room temperature.
By using the adhesive after leaving it for 8 hours or more, the familiarity of the adhesive increases, a slight spontaneous curing occurs and the viscosity becomes stable, so that not only moldability problems such as dripping of the adhesive due to aging disappear, The baking and curing temperature of this adhesive can be lowered, which enables energy saving and mass production.

Further, in the method for manufacturing an incandescent light bulb of the present invention, the thickness of the adhesive is gradually increased from the shell inlet portion of the metal base to the inner portion, and then the metal base and the valve fitting portion are fitted together. In addition, more preferably by adding a volatile solvent into the metal die, by baking and curing the adhesive, it is possible to effectively prevent the penetration of flux into the metal die, It is possible to effectively prevent a disconnection accident of the lead wire when the valve is turned on.

[0015]

Embodiments of the incandescent light bulb of the present invention and a method of manufacturing the same will be described in detail below with reference to the drawings.

FIG. 1 is a partially cutaway front view of an incandescent light bulb of the present invention, and FIGS. 2 and 3 are partial cross-sectional views of a metal base showing the manufacturing process of the incandescent light bulb of the present invention.

In FIG. 1, the incandescent light bulb of the present invention is characterized in that the valve fitting portion 11 of the bulb 10 and the metal base 20 are fitted and bonded by a silicone resin adhesive 30.

The metal base 20 has a base eyelet 2 at the bottom.
1, the base eyelet 21 is connected to a light emitting portion 23 such as a tungsten wire through a lead-in wire 22.
Further, the silicone resin adhesive 30 is applied to the shell inlet portion 24 at the fitting portion with the valve fitting portion 11.

The silicone resin adhesive 30 used in the present invention comprises 15 to 25% by weight of a silicone resin,
Preferably 19 to 21% by weight, filler powder 82 to 72% by weight, preferably 77 to 79% by weight, and the high temperature volatile solvent are preferably 2 to 3% by weight so that the total amount becomes 100% by weight. Become.

The filler powder includes calcium carbonate and the like.

Further, examples of the high temperature volatile solvent include naphthenzole and the like.

In the silicone resin adhesive 30 used in the present invention, if the blending amount of the silicone resin is less than 15% by weight, the adhesiveness will be lowered, and if it exceeds 25% by weight, stickiness will occur and the workability will be lowered, which is not preferable. ..

If the content of the filler powder is less than 72% by weight, the amount of the silicone resin-based adhesive 30 increases and the stickiness is generated, resulting in a decrease in work. If it exceeds 82% by weight, the amount of the silicone-resin-based adhesive 30 decreases. And the adhesive strength is reduced, which is not preferable.

The high temperature volatile solvent content is 2% by weight.
If the amount is less than 3% by weight, the mixing property of the silicone resin adhesive and the filler powder is deteriorated.

In the silicone resin adhesive 30 used in the present invention, by optimizing the compounding ratio of each component, particularly the compounding ratio of the above-mentioned high temperature volatile solvent, the adhesive strength of the base of the incandescent light bulb to which this is applied is optimized. It can be maintained at 3 N · m or more, and the durability of the adhesive does not decrease at the end of the valve's life. It not only eliminates the loose base, but also effectively suppresses the flux penetration into the metal die. be able to.

However, the silicone resin adhesive 30 used in the present invention is prepared by mixing the above-mentioned components and thoroughly mixing them, and then leaving them in a closed container at room temperature for 48 hours or more (hereinafter, this is referred to as aging). It is desirable to call it) before putting it into practical use. By aging the silicone resin-based adhesive 30 in this way, the familiarity between the respective components increases, a slight natural curing occurs, and the viscosity stabilizes, so that there is a problem of moldability such as dripping of the adhesive due to aging. In addition to disappearing, the baking and curing temperature of this adhesive can be lowered, which enables energy saving and mass production.
If the above aging is omitted, or if the aging time is less than 48 hours, the viscosity of the silicone resin adhesive 30 is not stable, and the silicone resin adhesive is applied during the feel of applying to the metal die. Agent 30 drips,
Problems such as impairing moldability may occur.

The above-mentioned silicone resin adhesive 30 can be easily aged at room temperature using a metal container with a sealable lid, and even if it is left for a long time of 48 hours or more, the silicone resin adhesive 30 can be aged. Due to the filler powder and the high temperature volatile solvent that are the constituents of the adhesive 30, the natural viscosity does not proceed as much as the conventional phenol resin adhesive, and the stable viscosity can be maintained.

Next, the above-mentioned silicone resin adhesive 3
A method for manufacturing an incandescent light bulb using 0 will be described with reference to FIGS. 2 and 3.

The manufacturing method of the incandescent light bulb of the present invention is basically the same as the conventional manufacturing method in that it goes through the steps of bulb-mount-sealing-exhaust-basing-packaging sacking-packing. This is different from the conventional means in that the silicone resin adhesive 30 having the above-mentioned specific composition is used and a special device is added to the sealing and basing steps.

A specific example of the method for manufacturing an incandescent light bulb of the present invention will be described below with reference to an actual example.

First, 20% by weight of TSE series J manufactured by Toshiba Silicone Co., Ltd. as a silicone resin, 78% by weight of calcium carbonate powder (average particle size 105149 microns) as a filler powder, and Nippon Oil Co., Ltd. as a high temperature volatile solvent. Naphthenazole was blended at a ratio of 2% by weight, and sufficiently stirred and kneaded at room temperature for about 2 hours to prepare a silicone resin adhesive.

This was placed in a metal closed container having a volume of 10 kiloliters, left at room temperature of 15 to 25 ° C. for 48 hours, and aged to measure 8 with a simple penetration meter.
A silicone resin adhesive 30 having a fluidity of 120 seconds / 30 mm was obtained.

Next, the silicone resin adhesive 30 adjusted and aged as described above is applied to the inside of the shell inlet 24 of the metal die 20 as shown in FIG.
Applied to the thickness of.

Then, the metal die 20 coated with the silicone resin adhesive 30 as described above is inverted, left standing for a while, and then returned to the original state. The thickness of the adhesive 30 is gradually increased from the shell inlet portion 24 to the inner portion 25 of the metal die 20, specifically, the shell inlet portion 2
4 has an adhesive thickness L1 of 3 to 4 mm and an inner portion 25 has an adhesive thickness L2 of 1 to 2 mm, and then the metal base 20 and the valve fitting part 11 are fitted to each other, whereby It was possible to obtain a state in which the shell of 20 and the valve fitting portion 11 were fitted and adhered extremely tightly. By closely fitting and adhering in this manner, the metal base 2
When soldering the top portion of No. 0, the gas vapor pressure in the metal base 20 could be increased, and the flux could be effectively prevented from entering the metal base 20.

Then, after adjusting the fitting pressure so that the initial adhesive strength of the die is 3 N · m or more, about 190 to 250 ° C.
The silicone resin adhesive 30 was baked and cured at the temperature of.

Before the baking and curing, the metal die 20
After adding a small amount of volatile solvent such as alcohol to the inside,
By baking and curing the adhesive, the gas vapor pressure inside the metal base 20 was further increased, and the penetration of the flux into the metal base 20 could be prevented more effectively.

As described above, the incandescent light bulb manufactured by the method of the present invention in which the sealing and basing steps have been specially devised can secure the initial bonding strength of 3 N · m or more, and further, the final user turned on the rated light. In that case, the strength is further improved. Therefore, even when the valve is at the end of its life in use by the user, the adhesion strength of the base hardly deteriorates due to heat or ultraviolet rays, and it is possible to maintain a strength of 3 N · m or more and also to break the lead wire due to flux. There is no.

[0038]

As described above, the incandescent light bulb of the present invention can maintain the adhesive strength of the base at 3 N · m or more, and the durability of the adhesive does not deteriorate at the end of the life of the bulb. , Loose base can be eliminated.

Further, according to the method for manufacturing an incandescent light bulb of the present invention, by leaving the silicone resin adhesive in the airtight container at room temperature for 48 hours or more, the familiarity of the adhesive increases and some natural curing occurs. Since the viscosity is generated and the viscosity is stabilized, not only the moldability problem such as sagging of the adhesive due to aging can be eliminated, but also the baking and curing temperature of the adhesive can be lowered, which enables energy saving and mass production.

Further, according to the method for manufacturing an incandescent light bulb of the present invention, it is possible to effectively prevent the penetration of the flux into the metal base, and effectively prevent the accidental disconnection of the lead wire when the bulb is lit. can do.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view of an incandescent light bulb of the present invention.

FIG. 2 is a partial cross-sectional view showing a state in which a silicone resin adhesive is applied to a metal base in the process of manufacturing the incandescent light bulb of the present invention.

FIG. 3 is a partial cross-sectional view showing a state where the thickness of the silicone resin adhesive is changed after applying the silicone resin adhesive to the metal cap in the process of manufacturing the incandescent light bulb of the present invention.

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

[Explanation of symbols]

 10 valve 11 valve fitting part 20 metal base 21 base eyelet 22 lead-in wire 23 light emitting part 24 shell inlet part 25 back part 26 alcohol 30 silicone resin adhesive

Claims (4)

[Claims] 1. A fitting portion between a valve fitting portion and a metal base,
Silicone resin 15-25% by weight, filler powder 82-7
An incandescent light bulb characterized by being bonded with a silicone resin adhesive composed of 2% by weight and a high temperature volatile solvent. 2. A silicone resin adhesive comprising 15 to 25% by weight of a silicone resin, 82 to 72% by weight of a filler powder and a high temperature volatile solvent is prepared and then left in a closed container at room temperature for 48 hours or more. Then, the adhesive is applied to the shell inlet portion of the metal base, the metal base and the valve fitting portion are fitted together, and then the adhesive is baked and cured to produce an incandescent light bulb. .. 3. The thickness of the adhesive is gradually increased from the shell inlet of the metal die to the inner portion by applying a silicone resin adhesive to the shell inlet of the metal die and then reversing the metal die. The method for producing an incandescent light bulb according to claim 3, wherein the metal base and the valve fitting portion are fitted together, and the adhesive is baked and cured. 4. The volatile solvent is added to the metal die before baking and curing the silicone resin adhesive applied to the shell inlet of the metal die, and the volatile solvent is added to the metal die. Method for manufacturing an incandescent light bulb.