JPS59151731A - Manufacture of lamp - Google Patents

Abstract

PURPOSE:To sharply reduce time required for exhaust process by a method in which low-melting point glass is sticked in advance to the bulb opening end and said bulb opening end is put closely to an end plate for heating while melting the low-melting point glass for sealing. CONSTITUTION:The opening end 4 of a preheated glass bulb 3 is dipped into the melted low-melting point glass 2 followed by pulling it out for cooling. The low- melting point glass 2 is sticked to the opening end 4 of the bulb 4. Next, the opening end 4 of the bulb 3 to which the low-melting point glass 2 is sticked is closely put to the groove 8 of an end plate 9 so as to enter it while melting the low-melting point glass sticked by heating followed by cooling and solidifying. Thereby, the bulb opening end and the end plate are sealed by the low-melting point glass 2.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a lamp having a structure in which a limited space is formed by a pulp having an open end and an end plate that closes the opening of the pulp.

Normally, this kind of lamp, for example, a glass pulp with an open end, whose opening is hermetically sealed with a ceramic end plate, and inside which is arranged a pair of electrodes and an inner tube that regulates the discharge path between these electrodes. In the manufacturing process of small-sized discharge lamps, etc., low melting point glass powder, commonly known as glass frit, is used as an adhesive to seal the pulp and end plates. To seal the pulp and end plates using this glass frit, first, use a vehicle prepared by dissolving an adhesive such as nitrified cotton in a solvent such as acetic acid aluminum ester.

Glass frit powder is added and kneaded into a paste, which is then filled into the grooves formed in the areas where the end plates are to be sealed.Secondly, the open ends of the pulp are buried in the frit in the grooves. Conventionally, a method has been generally used in which the pulp and end plate are brought into contact with each other, heated to volatilize and remove the solvent and adhesive, melt the frit, and then cooled.

However, in the conventional sealing method as described above, during the heating process to melt the frit, decomposed gases from the solvent and adhesive volatilize from the frit-applied area, and some of it remains inside the pulp, causing damage to the inner surface of the pulp. Since these adsorbed gases are adsorbed on the surface of the pulp and electrodes, these adsorbed gases must be completely removed when the inside of the pulp is evacuated in the secondary process, and the disadvantage is that the evacuating process takes a long time. .

This invention was made to eliminate the above-mentioned drawbacks.
Specifically, when manufacturing a lamp with a structure in which an end plate is sealed to the open end of the pulp, low-melting glass is attached to the open end of the bulb in advance, and the open end of the pulp is brought into contact with the end plate. Its characteristic is that it is heated to melt and seal the low-melting point glass. In this method, to attach low melting point glass to the open end of the pulp, 1. For example, prepare a Japanese cypress with a low melting point glass inside and heat it to melt it, and then heat it in advance to near the softening temperature of the low melting point glass. It can be easily attached by dipping the open end of the pulp, then pulling it out and cooling it.

The low melting point glass attached in this way does not contain any substances other than glass, so when sealing the pulp and end plate, the inside of the bulb will not be contaminated with impure gas.
Therefore, compared to the conventional method, which involves adding a solvent and an adhesive to glass frit, applying it, and then heating and sealing, the time required for exhaust treatment in the exhaust process after sealing can be significantly shortened.

Hereinafter, as two embodiments of the present invention, a case where the method of the present invention is applied to the manufacture of a small discharge lamp will be described with reference to FIG. 2, following the manufacturing procedure.

(1) First, in a 300cc platinum evaporating dish (1) as shown in Figure 1, put 1 kg of low melting point glass (2) whose main components are boric acid and lead oxide and has a softening temperature of 370°C.
Heat to 70°C to melt the low melting point glass.

(2) Next, as shown in Figure 2, 36
Open end (4) of glass pulp (3) heated to 0℃
) is immersed in molten low melting point glass (2).

(3) Then, the soaked pulp (3) is pulled up and cooled. At this time, the low melting point glass (2) is attached to the open end (4) of the bulb (3) in a state as shown in FIG.

(4) Next, as shown in Fig. 4, a pair of electrodes (5) and two approximately U-shaped inner tubes (6) each having one end hermetically surrounding the electrode (5) and the other end open. The exhaust thin tube (7) is inserted into the center, and the open end (3) of the pulp (3) is inserted into the periphery.
4) a ceramic end plate (9) formed with a receiving groove (8);
To.

The open end (4) of the pulp (3) with the low melting point glass (2) attached! ! %1 (Abut so that it falls into 81.

(5) Next, it is heated to 420° C. to melt the attached low melting point glass, and then cooled and solidified. As a result, the opening end of the valve and the end plate are sealed with the low melting point glass (2) in the state shown in FIG.

(6) Then, connect the exhaust tube (7) to the exhaust route.

After creating a vacuum inside the lamp, a small amount of rare gas and mercury are filled in and sealed to complete the discharge lamp.

When manufacturing a small discharge lamp using the above method, the time spent in the evacuation process is the same as that of the conventional method.

That is, the time can be reduced to about 1/2 compared to a method in which the open end of the pulp is buried in a paste-like frit coated on the end plate and then heated to melt and seal the frit.

In addition, in the above example, a low melting point glass with a softening temperature of 370°C is used, which is heated to 470°C to melt it, and pulp heated to 360°C is immersed in it, but the melting temperature and immersion are different. The temperature of the pulp should be appropriately set depending on the properties of the low melting point glass used, especially the viscosity-temperature characteristics. In addition, when sealing is performed using low melting point glass, the optimal temperature for sealing is usually higher than the softening temperature of the low melting point glass used, so it is important to prevent deformation of the pulp due to heating during sealing. Naturally, the low melting point glass used in the method of the present invention must have a softening temperature lower than that of the bulb glass to be sealed.

As mentioned above, when sealing an end plate to the open end of the pulp, a low melting point glass having a softening temperature lower than that of the pulp is attached to the open end of the pulp, and then the end plate and the pulp are sealed. The method of the present invention, in which the open end of the glass is brought into contact with the open end of the glass and heated in this state to melt the low melting point glass, is an effective lamp manufacturing method that can significantly shorten the time required for the exhaust process after sealing.

[Brief explanation of drawings]

1 to 5 are diagrams showing the steps of the method of the present invention. In the figure, (2) is low melting point glass and (3) is pulp. (4) is an open end, and (9) is an end plate. Note that the same reference numerals in each figure indicate the same or corresponding parts. Agent Makoto Kuzuno - Figure 1. 1 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] When sealing an end plate to the open end of the pulp, a low melting point glass having a softening temperature lower than that of the pulp is attached to the open end of the pulp, and first, the end plate and the open end of the pulp are brought into contact. , a method for producing a rung characterized by heating in this state to melt the low melting point glass.