JPH0266832A - Manufacture of single-ended base type fluorescent lamp - Google Patents

Abstract

PURPOSE:To form an aperture which does not expose a phosphor substance to the outside by breaking a part of the side wall of a glass bulb which has a phosphor membrane on the inner wall surface by decompression of gas in the bulb. CONSTITUTION:Glass bulbs 11 and 23 which have phosphor membrane at the inner wall surface are contacted at the apertures 22 and 24 formed respectively, to form a single-ended metal type fluorescent lamp linking each other. The formation of the aperture 22 is made by heating and softening the scheduled connection part 19 of the glass bulbs 11 and 23 whose one end is sealed and an exhaust pipe 14 and a stem are sealed up at the other end, and a dry air or the like is pressed in the bulb from the exhaust pipe 14 to form a projection 20. Then the air pressure in the bulb is reduced through the exhaust pipe 14, the projection is sucked up to the inside and broken, and the aperture 22 is formed. At the aperture 22, no phosphor is exposed to the outside, and it is connected to the aperture 24 formed in the same manner at the bulb 23.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention bends a discharge path by joining a plurality of straight glass bulbs by fusing the end side walls of adjacent bulbs. The present invention relates to a method of manufacturing a single-capped fluorescent lamp in which an electrode mount is sealed to one end of the lamp.

[Prior Art] Recently, various single-capped fluorescent lamps have been developed and put into practical use. As an example of this, as shown in Figure 1, a single-capped fluorescent lamp has a plurality of glass bulbs whose end side walls are fused together to conduct and connect them to each other to form a single curved discharge path as a whole. is proposed. And, JP-A-55-13
Japanese Patent No. 3730 discloses a method for manufacturing the single-ended fluorescent lamp.

In this manufacturing method, first, as shown in FIG. 2, a phosphor film 2 is deposited on the inner wall surface, one end is closed, and a stem 3 equipped with an exhaust v4 and an electrode filament 5 is installed at the other end. Two sealed glass bulbs 1 are prepared.

Next, as shown in FIGS. 3 and 4, a part of the side wall of the glass bulb 1 on the closed end side is heated by a burner 6.
The opening 8 with the collar 7 is formed by softening and blowing this softened part outward from the inside of the glass bulb with a slight excess pressure of dry air or inert gas injected through the exhaust pipe 4. , two glass bulbs are joined together so that these collars are electrically connected to each other.

[Problems to be Solved by the Invention] However, according to the above manufacturing method, the end side walls of the glass bulbs to be joined are heated and softened, and the side walls are heated and softened from the inside to the outside by excessive gas pressure supplied into each glass bulb. In order to cause the bulb to blow out in the opposite direction, the periphery of the opening is opened outward as shown in FIG. 5, and the phosphor film deposited on the inner wall surface of the bulb is exposed to the outside of the opening.

For this reason, when the collar of the glass bulb is fused in the next step, the phosphor substance is trapped in the glass, and there is a risk that the mechanical strength and airtightness of the joint may be reduced.

[Means for Solving the Problems] The present invention has been made in view of the above-mentioned problems, and consists of bonding and conducting a plurality of glass bulbs each having a phosphor film coated on their inner walls to form a single discharge path. An object of the present invention is to provide a method for manufacturing a single-cap fluorescent lamp having a highly reliable bonding means that does not entrap phosphor material into the glass at the bonding portion. purpose.

In order to achieve the above object, the method for manufacturing a single-capped fluorescent lamp according to the present invention includes a method for manufacturing a single-capped fluorescent lamp, in which a phosphor film is adhered to the inner wall surface, one end is closed, and the other end is sealed with an electrode mount. Using a glass bulb, heat the area to be joined on the side wall of the closed end.
After softening and supplying excess gas pressure inside the glass bulb to form a protrusion and a local thin wall, the thin wall is heated again to soften it and reduce the pressure inside the glass bulb to remove the inside of the bulb. It is characterized in that by sucking and tearing the glass, an opening is formed that does not expose the phosphor material to the outside, and then the openings are brought into contact with each other and fused.

[Function] According to the manufacturing method according to the present invention, when a plurality of glass bulbs each having a phosphor film coated on their inner wall surfaces are bonded and electrically connected to each other, the portions of the side walls of the glass bulbs to be bonded are heated in advance; a softening step, a step of supplying excessive gas pressure into the glass bulb to form a protrusion and a local thin wall portion, and then heating the thin wall portion again to soften it and soften the inside of the bulb. This method includes the step of forming an opening by reducing the pressure and sucking it inward to the glass bulb.
The phosphor material deposited on the inner wall surface of the bulb is not exposed to the outside of the opening, and the mechanical strength and airtightness of the joint are reduced and defects are prevented due to the phosphor material being trapped in the glass. Fewer and more reliable joints can be obtained.

[Example] Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIGS. 6 to 14 are explanatory diagrams showing the steps of an embodiment of the manufacturing method according to the present invention.

First, as shown in FIG. 6, a suspension of a phosphor substance is applied to the inner wall surface of a straight glass bulb 11, dried, and then fired to form a phosphor film 12.

Next, as shown in FIG. 7, one end of the glass bulb 11 is heated and closed to form a closed part 16, and the other end, an open end 17, is closed.
A phosphor film removed portion 18 is formed by removing the phosphor film near the phosphor film. Then, the stem 13 provided with the exhaust pipe 14 and the electrode filament 15 is sealed in the removal section 18 .

FIG. 8 shows the glass bulb 11 after the above-mentioned process is completed, and the part 19 of the glass bulb 11 to be joined near the closed part 16 is heated and softened, and then dried from the exhaust pipe 14 as shown in FIG. Pressure is applied by supplying air or an inert gas to form a protrusion 20 and a local thin wall portion 2.
Form 1. FIG. 10 is a partially enlarged view for explaining the protrusion and thin wall portion formed by the above process.

Furthermore, as shown in FIG. 11, the thin portion is heated again,
While softening, the pressure inside the bulb is reduced using a pressure reducing means such as a vacuum pump, and the glass in the thin wall portion is sucked and broken to form the opening 22.

FIG. 12 is a partially enlarged view showing the vicinity of the opening after the opening is formed, and the thin wall portion is heated and softened, the pressure inside the bulb is reduced, and the glass is sucked inward to the bulb to break it, so that the inner wall surface is It is possible to obtain an opening in which the deposited phosphor material is not exposed to the outside.

Then, as shown in FIG. 13, another glass bulb 23 in which an opening 24 is formed is formed in a process similar to the above process, and the glass bulb 11 and the glass bulb 23 are aligned with each other so that the openings are aligned. They are joined by heating and fusing.

Next, the intermediate stage fluorescent lamp shown in FIG.
4, and a single-capped fluorescent lamp is manufactured by the usual process.

Note that the method for manufacturing a single-cap fluorescent lamp according to the present invention is not limited to the above-mentioned fluorescent lamps; for example, a single-cap fluorescent lamp having four glass bulbs arranged in a plane, or a square cross-section 4 three-dimensionally structured
The present invention can be applied to a single-cap type fluorescent lamp having a large number of glass bulbs, and can also be applied to a fluorescent lamp having a large number of glass bulbs.

Furthermore, the present invention can also be applied to a single-cap fluorescent lamp in which two or more glass bulbs bent into a U-shape are joined and electrically connected at the side walls of the straight pipe portions.

[Effects of the Invention] As explained above, the present invention provides a single-cap type in which a single discharge path is formed by bonding and conducting a plurality of glass bulbs whose inner walls are coated with a phosphor film. In a method for manufacturing a fluorescent lamp, when forming an opening, the side wall of the glass bulb is heated and softened in advance, and excessive pressure is supplied into the bulb to form a protrusion and locally thin walled portion. The process includes a step of forming a thin wall, and then a step of heating the thin wall part again to soften it and reducing the pressure inside the bulb to suck the glass inward, thereby removing the phosphor material that adheres to the inner wall surface. An opening with no exposure to the outside is obtained, no phosphor substance is trapped in the glass during the subsequent bonding process, and a highly reliable bonded part with few defects or decreases in mechanical strength and airtightness is obtained. It has the excellent effect of being

[Brief explanation of the drawing]

FIGS. 1 to 5 are explanatory diagrams of a conventional method for manufacturing a single-capped fluorescent lamp, and FIGS. 6 to 14 are explanatory diagrams following the process order of a manufacturing method showing an embodiment of the present invention. 11...Glass bulb, 12...phosphor film, 13...
Stem, 14・Exhaust pipe, 15・Electrode filament, 1
6... Closed part, 17... Open end part, 18. Fluorescent material removed part, 19... Part to be joined, 20... Protrusion part, 21.
...Thin wall part, 22...Opening, 23...Glass bulb, 24...Opening

Claims (1)

[Claims] (1) Heating and softening the end side wall of a glass bulb whose inner wall surface is covered with a phosphor film, one end is closed, and the other end is sealed with a stem equipped with an exhaust pipe and an electrode filament. a step of supplying excessive gas pressure into the bulb to form a protrusion on the side wall and a locally thinned portion; and a step of heating and softening the thinned portion again and heating the inside of the bulb. A method for manufacturing a single-capped fluorescent lamp, which includes the step of forming an opening by reducing the pressure and sucking and breaking the glass in the thin wall portion inward of the bulb.