JPH05809B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a method for manufacturing a discharge lamp in which the bottom of a bulb is fixed to an end plate via an adhesive (hereinafter referred to as glass frit), and in particular, to Regarding the fixing method.

[Prior art]

In recent years, in the field of discharge lamps, particularly fluorescent lamps, various compact fluorescent lamps have been proposed with the aim of making the shape more compact. FIG. 1 shows an example.

In the figure, 1 indicates two U-shaped glass tubes 1.
A glass bulb having one end side of 1 in communication with each other,
2 is a ceramic end plate that closes the open bottom parts 12 and 13 of this bulb 1; 4 is a glass stem to which an electrode 3 is sealed; this stem 4 is connected to the glass tube 1;
One of each is disposed within one end side of 1. 6 is a glass exhaust pipe. Further, 14 is a connecting portion of the bulb 1, and 9 is a phosphor layer deposited on the inner surface of the bulb 1.

In such a fluorescent lamp, the bulb 1, stem 4, end plate 2, exhaust pipe 6, etc. are arranged in a compact manner, so it is extremely difficult to heat and directly seal these parts together, so generally a glass frit 5 is used. Fixation is done through the Moreover, if the glass frit 5 is used for fixing, the temperature for the solidifying operation can be lower than that in the case of direct sealing.
Furthermore, since the glass frit 5 serves as a cushion between the fixed parts, the coefficients of thermal expansion of each part do not need to be exactly the same. Therefore, there are also advantages such as a wider range of material selection for each component.

However, in the method for manufacturing the lamp configured as described above, the bulb 1, end plate 2, stem 4, and exhaust pipe 6 are each made as separate parts, and these are fixed on the surface of the end plate 2. Because of this, the number of parts and places that are stuck will increase when the force sticks. Therefore, it is desirable that the coating work and assembly work of the glass frit 5 be as streamlined as possible.

Furthermore, since the glass frit 5 is usually used in the form of a paste made by mixing the glass frit powder 5 in a vehicle of a solvent and a binder, if the glass frit 5 is not sufficiently dried, the solvent and binder in the glass frit 5 will be trapped inside the bulb 1, which will have a negative effect on the lamp characteristics. effect.
If a pre-formed molded product is used as the glass frit 5, the above problem will be eliminated, but in particular, in order to secure the bottom parts 12 and 13 of the bulb 1, it must be made to have the same size as the bottom diameter of the bulb 1. A new problem arises in that it is difficult to obtain large molded products.

Furthermore, when heating the glass frit 5 to melt and solidify it, for example, if the stem 4 and exhaust pipe 6 are fixed to the end plate 2 and then the bottom parts 12 and 13 of the bulb 1 are fixed, the previously fixed part is This causes thermal distortion to occur, leading to a decrease in the strength of the fixed portion.

[Summary of the invention]

This invention was made in view of the above circumstances, and provides an improved method for manufacturing a lamp in which the bottom of the bulb, the stem, and the exhaust pipe are fixed to the end plate via a glass frit. In particular, it is an object of the present invention to provide a fixing method that streamlines glass frit coating work, parts assembly work, and glass frit melting and solidification work, facilitates automation of these works, and is favorable in terms of lamp characteristics.

[Embodiments of the invention]

Next, an embodiment of the present invention will be explained based on FIGS. 2 to 6. In these figures, 1 is a bulb, and this bulb 1 has two U-shaped soda glass tubes 11 with open ends 12 and 13, one end of which is connected to the outside in an airtight manner. Become.
Reference numeral 2 denotes a square end plate made of forsterite ceramics that airtightly closes the open bottom parts 12 and 13 of the valve 1, and furthermore, at a predetermined position on the upper surface 25 of this end plate 2, the open bottom parts 12 and 13 of the valve 1 are closed. A stem insertion hole 24 for a stem (described later) is formed in one of the grooves 22, and an exhaust pipe insertion hole 26 is integrally formed in one of the grooves 23. be. Note that one of the grooves 22 also serves as a stem receiver.

Reference numeral 4 denotes a flared stem made of lead glass, and the electrode 3 is sealed to the stem 4, and a lead wire 33 and a glass capillary tube 34 protrude outward. Further, the flare diameter of the stem 4 is made slightly smaller than the inner diameter of the glass tube 11 of the bulb 1 described above. Reference numeral 6 denotes an exhaust pipe made of lead glass, and near the tip 61 of the exhaust pipe 6 on the side included in the valve 1, there is a collar-shaped enlarged diameter part 66 that is enlarged to a diameter larger than that of the exhaust pipe insertion hole 26. is formed. 55 is a cylindrical pellet made by molding glass frit 5, which will be described later. Further, 14 is a communication portion of the bulb 1, and 9 is a phosphor layer deposited on the inner surface of the bulb 1.

Next, a method of fixing the lamp thus constructed using glass frit will be explained step by step.

1 Glass frit powder whose main component is lead borate (for example, IWF- manufactured by Iwaki Glass Co., Ltd.)
A glass frit 5 in the form of a paste is prepared in advance by mixing the glass frit 5 (T029) and a vehicle (nitrified cotton dissolved in isoamyl acetate).

As shown in FIG.
The above-mentioned glass frit 5 is applied to the insides of 2 and 23.

2. After the coating is completed, the end plate 2 is inserted into a tunnel drying oven A as shown in FIG. 4 and dried at about 150° C. for 15 minutes to dry the vehicle in the glass frit 5.

3. Next, after inserting the exhaust pipe 6 into the exhaust pipe insertion hole 26 of the groove 23 on one side of the end plate 2, the pellet 55 is fitted from the tip 66 of the exhaust pipe 6.

4 Next, the lead wire 33 and the glass capillary tube 34 are inserted into the lead wire insertion hole 24 in the other concave groove 22 of the end plate 2.
Place the stem 4 in a state where it is inserted into the.

5 After this, insert the valve 1 into the respective grooves 22 and 23.
The bottom parts 12 and 13 of each are placed. FIG. 5 shows the state in which the tasks described in sections 3, 4, and 5 have been completed. Note that B is an end plate support jig.

6. When the assembly work is completed, the glass frit 5 and the pellets 55 of the glass frit 5 are heated and melted by putting it in the tunnel fixing furnace C as shown in FIG. 6 and maintaining it at 450° C. for 5 minutes to complete the series of fixing operations.

That is, according to such a fixing method, the glass frit 5 can be applied to the necessary fixing locations such as the bottoms 12, 13 and the stem 4 of the bulb 1 in one step, making the coating work easier. Furthermore, since there are no obstructions other than the end plate 2 during the application of the glass frit 5 to the end plate 2 and the drying process, it can be handled as a square plate. Therefore, the glass frit 5
The coating machine and drying oven A can be simplified, and
It also becomes easy to transport and take out the end plate 2 before and after each process.

On the other hand, when assembling the parts to the end plate 2, the exhaust pipe 6, pellet 55, stem 4,
Since it is only necessary to place and insert the valve 1 in sequence, it can be easily performed as a series of operations. Since all the fixing is done in one heating process, the fixing process can be simplified and the strength of the fixed parts will not be reduced.

Furthermore, since the vehicle in the paste-like glass frit 5 is dried with only the glass frit 5 coated on the front end plate 2 on which the bulb 1 is placed, the vehicle evaporates smoothly and remains until the subsequent process. Nothing happens. Therefore valve 1
The problem of vehicle getting trapped inside is also eliminated. exhaust pipe 6
Since the pellets 55 used for fixing are dry molded, there is no such problem originally. Also, since this pellet 55 has a small diameter, the pellet 5
5 itself is not difficult to manufacture.

In the above embodiment, the pellet 55 is fitted into the tip 61 of the exhaust pipe 6 after the exhaust pipe 6 is inserted into the insertion hole 26, but it is possible to fit the pellet 55 into the tip 61 in advance. There is no problem even if this exhaust pipe 6 is inserted into the insertion hole 26.

Moreover, the airtight adhesion between the exhaust pipe 6 and the end plate 2 is achieved by applying paste-like glass frit 5 to the upper surface of the enlarged diameter portion 66 of the exhaust pipe 6, as shown in FIG. Furthermore, that frit 5
The exhaust pipe 6 which has been dried may be inserted into the insertion hole 23. With this method, the paste used for fixing the bulb 1 and stem 4 can be used as is without detracting from the effects of the above-described embodiments, and the glass frit paste 5 can be shared.

Further, in the above-described embodiment, the case where there is only one valve 1 has been described, but as shown in FIG. Of course, this fixing method can also be applied to lamps with a double tube structure consisting of. That is, in the lamp of FIG. 8, the end plate 2 further includes a groove 2 for receiving the bottom part 20 of the second bulb 10.
7 is formed, and the concave groove 22 of the first valve 1,
When applying the glass frit 5 to the groove 23, the glass frit 5 may also be applied to the groove 27. Further, in order to assemble the parts, it is sufficient to place the first valve 1 and then subsequently place the second valve 10. In the lamp shown in FIG. 8, the discharge space is formed by the second bulb 10 and the end plate 2, so the insertion hole 2 of the exhaust pipe 6 is
6 is not particularly limited to the inside of the groove 23, and the insertion hole 26 can be provided in other parts as shown in the figure. 15 is a notch for gas conduction.

〔Effect of the invention〕

As described in detail above, the present invention is a method for manufacturing a discharge lamp in which a bulb and an end plate that closes the bottom of the bulb are fixed with glass frit, in which glass frit is applied to the portions of the end plate surface where the bulb and stem are to be fixed. a step of drying to remove the solvent of the applied adhesive; and a step of inserting an exhaust pipe having an enlarged diameter portion larger in diameter than the diameter of the exhaust pipe insertion hole into the exhaust pipe insertion hole of the end plate. , the step of fitting a molded glass frit containing no solvent onto the enlarged diameter part of the exhaust pipe, and placing the corresponding stem and valve on the glass frit painted at predetermined locations on the end plate surface. It was composed of the process of melting and solidifying each of the glass frits mentioned above.
Coating, drying and solidifying the glass frit, as well as assembling the parts to the end plates, can each be done in one process. Moreover, the work that connects each process can be done in a series of assembly steps with the glass frit coated side of the end plate facing up. Therefore, manufacturing can be rationalized and automated, and product costs can be reduced. In addition, in the above manufacturing method, adhesive was applied in advance to the enlarged diameter part of the exhaust pipe, dried and adhered separately, and this exhaust pipe was inserted into the exhaust pipe insertion hole of the end plate. In addition to the effects, there is also the advantage that the glass frit can be shared.

[Brief explanation of the drawing]

FIG. 1 is a perspective view partially showing a small fluorescent lamp, FIGS. 2 to 6 are diagrams illustrating an embodiment of the present invention, FIG. 2 is an exploded perspective view of the lamp, and FIG. FIG. 4 is a sectional view showing the coating process, FIG. 4 is a drying process diagram, FIG. 5 is a sectional view showing the state of the glass frit before the solidification process, FIG. 6 is a glass frit solidification process diagram, and FIGS. 7 and 8 are FIG. 7 is a partially enlarged view, and FIG. 8 is an exploded perspective view of the lamp. In the figure, 1 is the bulb, 12 and 13 are the bottom of the bulb, 2 is the end plate, 25 is the top surface of the end plate, 26 is the exhaust pipe insertion hole, 4 is the stem, 5 is the glass frit, 5
5 is a pellet, 6 is an exhaust pipe, and 66 is an enlarged diameter portion. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A method for manufacturing a discharge lamp in which a bulb and an end plate that closes the bottom of the bulb are fixed with an adhesive, in which the adhesive is applied to the portions of the end plate surface where the bulb and stem are to be fixed. step, a drying step to remove the solvent of the applied adhesive, and inserting an exhaust pipe having an enlarged diameter part larger than the diameter of the exhaust pipe insertion hole into the exhaust pipe insertion hole of the end plate. A process of fitting a molded adhesive that does not contain a solvent onto the enlarged diameter part of the exhaust pipe, and placing the corresponding stem and valve on the adhesive applied to each predetermined location on the end plate surface. A method for manufacturing a discharge lamp, comprising a step of subsequently melting and solidifying each of the adhesives described above. 2. The method of manufacturing a discharge lamp according to claim 1, wherein the bulb includes a first bulb and a second bulb that airtightly surrounds the first bulb. 3. The method of manufacturing a discharge lamp according to claim 1 or 2, characterized in that after the exhaust pipe is inserted into the insertion hole, a molded adhesive containing no solvent is fitted. 4. The method of manufacturing a discharge lamp according to claim 1 or 2, characterized in that an exhaust pipe fitted with a molded adhesive that does not contain a solvent is inserted into the insertion hole. 5. In a method for manufacturing a discharge lamp in which a bulb and an end plate that closes the bottom of the bulb are fixed with an adhesive, there is a step of applying the adhesive to the part of the end plate surface where the bulb and stem are to be fixed, and The drying process removes the solvent from the adhesive, and the step of forming an enlarged diameter part with a diameter larger than the diameter of the exhaust pipe insertion hole provided in the end plate, and applying adhesive to the upper side of the enlarged diameter part. The step of inserting the dried exhaust pipe into the exhaust pipe insertion hole of the end plate, and placing the corresponding stem and valve on the adhesive applied to each predetermined location on the end plate surface, and then applying each of the above adhesives. A method for manufacturing a discharge lamp, comprising a step of melting and solidifying.