JPH10162736A - Manufacture of double ring-shaped fluorescent lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a uniform shape by arranging a guide plate in the center of a recess of a part where a drum and glass tubes contact with each other so as to keep a regular interval in order to keep an interval between two tubes constant. SOLUTION: A central part of a straight sealed tube is heated and softened by a gas burner, and is faired in a U shape, and this is heated and softened further by a heating furnace, and a recess 4 of a sealing part is gripped, and is pulled and introduced to a winding drum 3. The winding drum 3 has a semicircular recess, and a guide plate 2 to keep an interval between glass tubes constant is also arranged in a central part. An almost annular double rung-shaped lamp can be formed by this fairing work. However, since an end part remains in a straight shape, this part is heated and softened further later on, and is faired in an annular shape. After this fairing is completed, noble gas and mercury are sealed after air is exhausted through an exhaust pipe 5. Therefore, the same effect such as two lamps are arranged on the same plane can be obtained, and high illuminance according to the realization of high watt can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a fluorescent lamp, and more particularly, to a method for manufacturing a ring-shaped fluorescent lamp having a double ring shape.

[0002]

2. Description of the Related Art Conventionally, a ring-shaped fluorescent lamp generally used is provided with electrodes at both ends, and a straight sealed tube coated with a phosphor on an inner surface is first heated and softened as a whole, and then is softened. The part that guides and bends the glass tube is wound on a circular drum with a semicircular recess, the glass tube is shaped into a ring shape, and exhausted in the next process, and manufactured by the process of enclosing the rare gas and mercury Is done.

[0003]

With the conventional tube bending process, a double annular ring-shaped fluorescent lamp cannot be shaped. Also, make one ring-shaped fluorescent lamp one by one, arrange two lamps on the same plane before evacuation, and then make a hole at an appropriate place by a combination of heating and rare gas pressure at the end of the tube. Later, a method was considered in which both the lamps were brought closer to each other to fuse the melted glass portion. However, in this case, it was impossible to efficiently join the lamps in terms of production technology due to variations in the tube diameter and the ring diameter of the individual lamps. And in this method 2
There is a drawback in that it is necessary to separately manufacture individual ring-shaped fluorescent lamps, and the working efficiency is extremely poor. There has never been a technology for efficiently producing a double tube ring-shaped fluorescent lamp, and a solution has been awaited.

[0004]

According to the present invention, in a continuous manufacturing process using a straight glass tube, first, two straight glass tubes are integrated by U-shape or bridge shaping. In this process, the shape of the take-up drum that bends the tube into a ring shape is devised, and a step of finally shaping the drum into a double ring is realized. That is, if a U-tube is simply bent by heating,
It was difficult to keep the spacing between the individual tubes constant, and the finished lamp was extremely irregular in shape, making it impossible to produce a product.

In the present invention, in order to solve this problem,
A device was added to the part where the winding drum and the glass tube were in contact. Generally, the contacting part is a simple semicircle or a depression, but in order to keep the distance between the two tubes constant, a certain distance can be kept in the center of the depression of the contact part between the drum and the glass tube By providing the guide plate at the center of the recess as described above, a double-tube annular fluorescent lamp having a uniform shape could be completed.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The manufacturing process of the present invention will be described. FIG. 3 shows a sealed tube provided with electrodes and exhaust pipes at both ends, and a fluorescent substance applied inside the glass tube. The central part of this straight sealed tube was heated and softened by a gas burner,
Shape it into a U-shape. This is shown in FIG. Next, the entirety of the U-shaped tube is heated and softened by a heating furnace and guided to a winding drum shown in FIG. The guidance at this time is the depression 4 of the sealing part.
Can be performed by gripping the metal and pulling it toward the drum. At this time, the exhaust pipe 5 is bent in advance in a manner perpendicular to the dent of the drum so that the exhaust pipe does not hit the drum.

The take-up drum 3 has a semicircular recess, and a guide plate 2 at the center for keeping the distance between the glass tubes constant.
Is provided. The metal fitting 4 rotates toward the circumferential direction of the winding drum and guides the glass tube 1. The winding drum shown in FIG. 1 is substantially semicircular except for the central guide plate 2, but it may be cylindrical. If an air gap is provided in a portion where the exhaust pipe 5 and the metal fitting move, rotation is possible. By this shaping operation, a substantially annular double annular lamp shown in FIG. 5 is obtained. However, since the end portion 6 remains in a straight shape, this portion is further heated and softened later and shaped into an annular shape. FIG. 6 shows a state in which the shaping into a ring shape has been completed. This is evacuated and filled with a rare gas and mercury to complete a ring-shaped fluorescent lamp having a double ring.

[0008]

In the manufacturing process according to the present invention, a ring-shaped fluorescent lamp having a double ring can be completed by a continuous production process by successively using one glass tube. Compared to the method of bending two lamps separately and then drilling and welding holes between the lamps, the working time is about 60%, and the mechanical strength and uniformity of the shape of the finished lamp are remarkably much higher. Are better.

The double ring-shaped fluorescent lamp thus obtained has the same effect as two lamps arranged on the same plane, so that high illuminance accompanying high wattage can be achieved, and performance is reduced. The improvement was extremely large. For example, conventional JISC76
The combined luminaire of FCL32 and FCL40 according to No. 01 can output the same 72 watts with one double-ringed ring lamp according to the present invention, and the illuminance is reduced because the lamps are arranged on the same plane. By 20%, the device itself could be reduced to about half the thickness.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a sealed valve and a take-up valve that have been previously shaped into a U shape.

FIG. 2 is a plan view showing the entire winding drum.

FIG. 3 is a front view showing a straight sealed valve.

FIG. 4 is a front view showing a sealed valve shaped into a U shape.

FIG. 5 is a front view showing a double annular sealed valve after bending.

FIG. 6 is a front view showing the overall shape of the valve after completion by correcting a straight portion into a ring shape.

[Explanation of symbols]

1 ... Bulb after phosphor application, firing and mount sealing
Reference numeral 2 denotes a partition wall provided at the center of the take-up valve, 3 denotes an outer wall of the take-up valve, 4 denotes a recess in the sealing portion, 5 denotes an exhaust pipe, and 6 denotes a straight portion of the valve before completion of the annular shaping.

Claims (2)

[Claims] 1. A glass tube coated with a fluorescent material is sealed at both ends with mounts provided with electrodes. First, a central portion of a straight tube is heated and softened and then bent to form a U-shape. Alternatively, two straight tubes having a mount sealed to only one end are brought close to each other, and the ends on the non-electrode side are bridge-joined to form a discharge path between the electrodes. Then, after the whole is heated and softened, the two tubes are guided to a drum having a semicircular or cylindrical cross section, wound around the drum while rotating the drum, and shaped into an annular shape. A method for producing a double annular fluorescent lamp, characterized by enclosing mercury or a mercury alloy. 2. A double ring type drum having a semicircular or cylindrical cross section, wherein a drum having a guide plate at a central portion is used so as to keep a constant interval between two tubes. Manufacturing method of fluorescent lamp.