JPS5814447A - Manufacture of curved fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent the curved outer side of a central curved part of a straight glass bulb from becoming thinner than the other parts of the bulb, and increase the strength of a U-shaped bulb by heating the curved inner side of the central curved part to a higher temperature than the curved inner side of the central curved part. CONSTITUTION:A central curved part 3 of a straight glass bulb 1 is heated with burners 4 and 4 over its width range of 80mm. to 100mm.. Here, the temperature of the curved inner side on the side of a formation drum 5, whih is about 740 deg.C, is made about 20 deg.C higher than the temperature of the curved outer side, which is about 720 deg.C. After the heating process of the central curved part 3 is completed in such a manner as above, the bulb 1 is sent to a curving process in which the curved part 3 is wound around almost half the circumference of the formation drum 5 so as to curve the bulb 1 into a U-shape, thereby forming a central curve 6. By the means mentioned above, since the viscosity of the curved outer wall of the U-shaped bulb is maintained low due to the low temperature of this part, any decrease of the glass thickness of the curved outer wall can be prevented by suppressing the expansion of the curved outer wall during the curving work. Consequently, the bulb intensity of the curved part of the U-shaped bulb is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a one-tube fluorescent lamp that is bent into a generally saddle shape, for example.

As people become more conscious of energy conservation, it is desired that a power-saving light source be developed for the minute hand as well. From this,
Recently, Mr. Honde has released the fluorescent lamp device #II, which can be used by attaching a screw-in cap to a fluorescent lamp and screwing it into an existing incandescent lamp socket, and it is becoming widely used. This item is the device body with a cap.
ii! The structure is such that a lighting aSS product such as a meter and a fluorescent lamp are attached, and the fluorescent lamp is surrounded by a glove. In this case, since the fluorescent lamp is desired to improve the amount of light emitted, it is necessary to make the length of the discharge path within the limited space within the turtle globe as long as possible. Therefore, in this fluorescent lamp device, one
It uses a single-tube fluorescent hoop. This one-tube fluorescent lamp has a curved structure S that is approximately U-shaped at three locations in the pulp. Curved into a shape II
While forming a curved section S of I, both jI1st and 82 curved sections JkJilI are formed in a substantially 0-shape in a direction substantially orthogonal to the plane including the U-shape, and l pairs of 82 curved sections JkJilI are formed. It is common to form the metal body into a saddle shape.

By the way, the conventional method for bending straight pipe-shaped glass pulp into a U-shape is to rotate the glass pulp in the direction around the axis while preparing the bending process. Ill1 is heated and softened with a burner, etc., and an inner retention is created in this part to be curved to make it a thickness inner part, and then this softened Isseiyo*S+
A method is known in which the material is bent into a substantially U-shape by winding it around a forming drum. When applying this method to the above-mentioned saddle-shaped light beam, this saddle-shaped light beam is the curve formation IIJk1 of jll! After completing II,
Furthermore, since the pair of 1 growth plan lI between the curved feed and both ends of this ill is to be bent into a U-shape again, it is impossible to heat these curved plans 1I while rotating them at the same time. However, in the end, the above bending method cannot be adopted.

Therefore, we adopted another method in which glass pulp 1 was uniformly heated as a whole without being rotated, and then wrapped around a forming drum. Therefore, due to IIk of the forming drum, the outer side of the bending area is greatly stretched, and the thickness of the pulp in this area is reduced to about half of the inner side, reducing the strength of the pulp. There is a problem where the performance drops slowly.

The present invention was made based on the above circumstances.1
The purpose of this is: - 1.
This prevents the 81st part from becoming thinner than other parts.
The present invention aims to provide a method for manufacturing a curved tube fluorescent lamp that improves pulp strength.

That is, the method of the present invention achieves the above-mentioned object by producing one glass pulp -Nariko'ii! In the st-heating process, this curve formation 'ii! % compensation for heating the tube wall on the inside of the bend to a higher temperature than the tube wall on the outside of the bend.

The method of the present invention will be explained above based on a case where it is applied to a dramatic tube-shaped fluorescent lamp having a generally saddle shape.

First, as shown in FIG. 111, both ends S of a straight glass pulp body to which a maknt has been sealed in advance are supported by chucks 2.2. In this example, the total length is 2.
80■, pulp outer diameter 17. J$ ■ Ginseng and pulp wall thickness is 11. I use Maro's pulp J'&-. Then, the central curved portion ttss located at the axial center of the pulp 1 is heated over a width of 80 cm to 100 cm by the nosena 4.4 arranged oppositely so as to sandwich the central curved portion 1. The heating time varies depending on the type of glass, but in this example, it was heated for about 50 seconds, and the temperature of the tube wall on the inner side of the bottom drum was about 740°C on this bending circle side.
ij! The temperature of the tube wall on the outside of the pair of ears is about 720°C,
The temperature of tube 11 on the inside of the bend was increased by approximately 20 degrees Celsius. When the heating of the solid bending s3 is completed in this way, the bending process shown in Fig. s2 continues. In this bending process, the forming drum 6 is still brought into contact with the bent pipe wall of the central portion 3 to be formed, and then the chucks 2.2 are moved upward in a direction approaching each other. , Wrap the above-mentioned brass J around the forming drum 5 halfway around it to form a U-shape.
An acid part 6Jk is formed. Then, a gas such as an inert gas is sealed in the glass pulp l in this forming part to adjust the shape of the cut w of the central curve s6. Through the steps up to ζζ, the glass pulp 1 is bent into a U-shape, and both ends is r * r are mutually K1
1l and are located in the same direction.・Next, the central curve formation S# 7-car 1 amr in glass pulp l, the both-end curve schedule @II, 1 located in the r building, are in the same iit shape as in the case of the upper central self-generation schedule tFsJ! heated to. Then, 92 g of forming drums are brought into contact with the inner tube walls of both ends scheduled to be bent @# and J, respectively, and then the center curved S# and both ends -,
By moving the rr upwards in a direction closer to each other, the two ends s1 and 1 to be bent are wound half around the forming drum 9.1 to form a U-shape, and both ends are bent @10.
,1tllk is formed. In addition, in the same way as when this self-generated ridge was formed with seven curves in the center part g, gas was sealed in 1 yen of glass pulp and the cross-sectional shape of the curved both ends W6to*te was adjusted. By bending the glass pulp 1, the central curved acid part 6 and both ends @IF and F are 1lill
t.

and are positioned in the same direction, and the whole is curved into a saddle shape.

In this example, bending was performed with the radius of curvature of the central beam rii and miea 19 set at 30 cm.

However, according to such a method, the central curve planned portion 3
When heating the both-end bending plan s8.8, the tubes 11 on the inside of these bends are heated to a higher temperature than the tube walls on the outside of the bends. In other words, when bending the bulb 1, the temperature of the tube wall on the outside of the bend where the bulb 1 is stretched is kept low, so the viscosity of the glass in this part is kept low. Elongation of the outer bent portion is suppressed, and a decrease in inner thickness can be prevented.

This (/J) has the advantage that the bulb strength of the central i! IFN portion 68 and both end bent portions 10 e IO is improved, and damage accidents during the lamp manufacturing process and transportation are reduced.

8. In the above embodiment, the center curved portion was first bent, and then the both end curved portions were bent. However, the order of bending the rope is not limited to this, and the both end curved portions are bent. After completing the song, create the central song sJl! : You can make it similar to the song.

It goes without saying that the heating temperature of the portion to be bent and the dimensions of the bulb are not limited to those of the above-mentioned embodiments, and the method for manufacturing a curved tube-shaped fluorescent lamp according to the present invention is a method for manufacturing a saddle-shaped fluorescent lamp. For example, the present invention is not limited to a U-shaped lamp or a lamp having a continuous U-shaped curved portion.

In the method of the present invention described in detail above, after heating the bent portion tFs of a straight glass bulb, this bent portion 5i! 81 is wound around a forming drum, when heating the portion to be bent, this self-forming pre'ii! In this manufacturing method, the tube wall on the inside of the tube is heated to a higher temperature than the tube wall on the outside of the tube. According to this method, the tube wall temperature on the outside of the bend is low and the viscosity of the glass in this portion is kept low, so that the expansion of the glass on the outside of the bend in the portion to be bent during bending is suppressed. Therefore, it is possible to prevent a decrease in the wall thickness of the outer 11 parts of the lamp, thereby improving the pulp strength of the acid part, which has excellent effects such as reducing bulb breakage accidents during the lamp manufacturing process etc. .

[Brief explanation of the drawing]

The drawing is part 1 of the method of the present invention! An example is shown, and IKlm to 186s are working process %-Il[%-1 yang explanatory diagrams to be shown later. 1-...Straight glass pulp, J, #--Bending section (
Central curved section 1 both ends scheduled to be curved - 1st generation Sannin bento earthen bell Etakehiko

Claims (1)

[Claims] After heating the straight tube-shaped glass pulp bending plan S, this bending plan 'ii! In the method for manufacturing a curved tube-shaped silicone lamp in which the glass pulp is bent by winding the glass pulp onto a forming drum, when heating the part to be bent, the inner flange of the part to be bent is heated. A method for manufacturing a one-tube type silicon lamp, characterized in that the tube wall is heated to a higher temperature than the tube wall on the outside of the bend.