JPS59148263A - Lamp - Google Patents

Abstract

PURPOSE:To obtain a lamp that uses glass frit with exceedingly high reliability for airtightness in a sealing section by forming a rounded thickness section at the opening end edge section of a bulb. CONSTITUTION:A rounded thickness section 9 is formed on the opening end 2 of a bulb 1. The rounded thickness section 9 is received in the bulb receiving groove 7 of an end plate 3 and is sealed by glass frit 8. Since a lamp with such structure forms the rounded thickness section 9 on the bulb end received by the bulb receiving groove 7 of the sealing section, the contact surface between the side of the bulb receiving groove 7 and rounded thickness section 9 is exceedingly small even when the bulb end is shifted at sealing so as to make contact to the side of the bulb receiving groove 7. Since the vicinity of the contact section is filled with the glass frit 8, sealing strength can fully be maintained.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lamp having a structure in which the open end of a glass bulb and an end plate are hermetically sealed with a sealing low-melting glass called a glass frit.

An example of a rung with this type of horizontal profile is a small discharge lamp as shown in FIG. That is, in FIG. 1, 1 is a glass pulp having an open end 2, 3 is a pair of electrodes 4, and one end surrounds these electrodes 4 in an airtight manner,
It is a ceramic end plate in which two square-shaped inner tubes 5 with the other end open are arranged, and an exhaust thin tube 6 is inserted into the center and sealed. This ceramic end plate 3 has a groove T formed in its periphery as a valve receiver for receiving the open end 2 of the pulp 1, and the valve receiver is in the groove T between the open end 2 of the pulp 1 and the end plate 3. It is hermetically sealed with a glass frit 8.

In a lamp having such a structure, the most common cause of open circuits at present is that the strength of the sealing portion between the pulp 1 and the end plate 3 is unstable, and the reliability of the airtightness of the sealing portion is low. The inventors carefully studied the sealing process in order to improve the reliability described above. As a result, it was found that the main reason why the strength of the sealed portion is unstable is that the valve receiver of the end plate 3 has variations in the direction of the valve receiver of the pulp opening end 2 within the groove T.

Normally, in the manufacturing process of this type of lamp, in order to seal the pulp 1 and the end plate 3, a glass frit 8 is applied to the groove 7 of the bulb holder formed at the peripheral edge of the end plate 3. A method is used in which the glass frit 8 is melted by heating while the bulb opening end 2 is in contact with the bulb. Figures 2 to 4
The figures up to the figure show an outline of this sealing method. First, the pulp receiver of the end plate 3 is coated with glass frit 8 in the groove T as shown in FIG. 2. Generally, the glass frit 8 is applied by mixing a vehicle containing an adhesive such as nitrified cotton in a solvent such as aluminum acetate and powdered glass frit, kneading the mixture to form a paste, and then applying the mixture. This is done by drying and solidifying the solvent. Next, the open end 2 of the bulb 1 is brought into contact with the glass frit 8 coated inside the pulp receiver T in the state shown in FIG. 3, and heated in this state to melt the glass frit 8. When the glass frit 8 melts, the pulp open end 2 is buried in the melted glass frit 8 due to the weight of the bulb 1.

The state will be as shown in Figure 4. The sealing is then completed by cooling as it is. However, all the sealed parts
It would be ideal if the pulp open end 2 was buried in the center of the groove 7, as shown in the figure, but when the pulp open end 2 sinks into the molten glass frit 8,
Due to slight variations in the state of contact between the valve 1 and the end plate 30, the holding of the end plate 3 during heating, etc., one side of the valve opening end 2 may be in contact with the side of the groove 7 of the valve receiver of the end plate 3. Therefore, it often happens that they are sealed in a state as shown in FIG. When sealed in this state, the valve receiver of the end plate 3 has a glass frit 8 of a size sufficient to maintain airtightness at the part where the side surface of the groove 7 and the pulp opening end 2 are in contact. Therefore, airtightness between the inside of the pulp and the outside is substantially achieved only in the vicinity of the open end 2 of the pulp, which is buried in the glass frit 8, and where the pulp receiver is not in contact with the side surface of the groove 7. It has been found that since the sealing strength is maintained at a constant temperature, the sealing strength becomes extremely unstable, which causes a decrease in the reliability of the airtightness of the sealed portion of this type of lamp.

This invention was made in view of the above points, and aims to provide a lamp that uses glass frit in the sealing part, which has extremely high reliability in terms of airtightness. In a lamp having a structure in which a groove is provided to receive the opening end of the bulb, and the end plate and the bulb are hermetically sealed within this groove with a glass frit, a rounded white area is formed around the periphery of the opening end of the bulb. It is characterized by this.

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

FIG. 6 shows the sealed portion of the lamp of the present invention.
1 is a valve having an open end 2; 9 is a rounded white portion formed at the open end 2 of the valve 1; 3 is an end plate;
The valve receiver 7 provided on the peripheral edge of this end plate is a groove. In the white part 9 of the bulb 1, the bulb receiver of the end plate 3 is received in the groove T and sealed with a glass frit 8. Note that the parts other than those shown are the same as those in FIG. 1. In a lamp with such a structure, the pulp receiver in the sealing part has a rounded white part 9 formed at the end of the pulp that is received in the groove 7. Even if it deviates to the state shown in FIG. 7, the contact area between the side surface of the groove 7 and the white part 9 is extremely small, and there is glass frit near the contact area. 8, the sealing strength can be maintained sufficiently.

Next, two embodiments of the present invention will be described.

One end of the approximately cylindrical shape with an outer diameter of 70 mm, a height of 100 fl, and a wall thickness of 0.8 is reduced in diameter, and the open end of the hollow glass pulp is heated with a gas burner to soften it and form a tip part f. A white portion is formed so that the cross section is roughly circular with a diameter of about 2 tnts. A pair of electrodes and a substantially U-shaped inner tube with one end surrounding the electrode in an airtight manner and the other end being open are arranged, an exhaust thin tube is inserted into the center and sealed, and a width of 3 wN is placed at the periphery. The rectangular valve holder with a depth of 2 mm has a grooved ceramic end plate with a diameter of 70 mm and a thickness of 3 mm. After applying the frit, the open end of the pulp is brought into contact with the glass frit and sealed by heating. Next, connect the exhaust tube to the exhaust path, create a vacuum inside, then add a small amount of rare gas and mercury, and seal it. The results of manufacturing 1,000 small discharge lamps using the process described above.

There were no defects caused by loss of airtightness of the sealed portion in the steps after sealing. In addition, in the conventional production line where small discharge lamps are manufactured in the same process as above without forming a lump at the open end of the bulb, cracks in the sealing part and Approximately 3% to 5% of defects occur due to frit peeling, etc.

As described above, the present invention provides a groove for receiving the open end of the pulp on the surface of the end plate, and in the groove, the end plate and the pulp are hermetically sealed with glass frit. Since the edge is formed with a rounded bulge at its edge, it has the effect of making the sealing part extremely reliable in terms of airtightness.

[Brief explanation of the drawing]

Figure 1 shows an example of a lamp in which the pulp and end plate are sealed using glass frit I-wo, and Figures 2, 3,
and FIG. 4 is a diagram explaining the sealing method of the lamp in FIG. 1,
FIG. 5 is an enlarged view of the sealed portion of the lamp shown in FIG. 1, and FIG. 6 and FIG. 1 are enlarged views of the sealed portion showing one embodiment of the lamp of the present invention. In the figure, (I) is pulp, (2) is open end, (3)
(7) is an end plate, (7) is a bulb receiving groove, (8) is a glass frit, and (9) is a fillet. In each figure, the same reference numerals indicate the same or equivalent parts. Agent Shin Kuzuno - Figure 1 Figure 5 Figure 6 Figure 7 Figure 7

Claims (1)

[Claims] (1) A load is provided on the end plate surface to receive the open end of the pulp, and the end plate and the pulp are hermetically sealed within this groove with a glass frit, and the open end of the pulp is attached to the peripheral edge of the end plate. A patented lamp with a rounded interior.