JPH0822807A - Fluorescent lamp and its manufacture - Google Patents

Abstract

PURPOSE:To secure effective length of a discharge path within limited space and besides, improve light emission utilization efficiency by adding twist to a light emitting bulb. CONSTITUTION:After application of a phosphor on the inner face of a glass tube, and both ends are sealed with electrodes, whereby the glass tube is made in U shape. And, a twist is added within the range of 45-180 deg. and it is processed while holding the apex of the lamp processed in U shape and the vicinity of the electrode and heating and softening the glass tube. As a result, though the overall length of the lamp is long, compact shape can be obtained, and besides this fits to a spherical globe, too.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp, and more particularly to a compact fluorescent lamp.

[0002]

2. Description of the Related Art Compact fluorescent lamps have been increasingly used in recent years because of their high luminous efficiency and simplicity. Also, the shape of the lamp is various,
There is a U-shaped lamp that is previously processed into a saddle shape, or a spiral shape.

Further, these lamps are used alone or housed in a globe, and are usually provided with a lighting circuit.

[0004]

In compact fluorescent lamps, particularly those in which the lamp is housed in a globe, it is essential to accommodate a lamp having a long discharge path length in its small volume. Therefore, the processing is complicated with the conventional shape. Further, as shown in FIG. 2, for example, the conventional compact fluorescent lamp has many parallel portions in the arrangement of the light emitting bulbs, so that the lights emitted from the tube surfaces facing each other of the light emitting bulbs are mutually emitted. Is a shadow, and the amount of emitted light can be substantially reduced to the outside, resulting in poor light utilization efficiency.

The present invention relates to an improvement in such a small curved tubular fluorescent lamp, and has been made for the purpose of improving how to efficiently store the lamp in a globe and to improve the luminous efficiency of the lamp. It is a thing.

[0006]

[Means for Solving the Problems] By further twisting and processing a U-shaped lamp, the volume inside the globe can be effectively utilized. Further, since the shaded portions of the light emitting bulb can be reduced, the light emission efficiency of the lamp is significantly improved.

[0007]

[Operation] By adding a twist to the arc tube, an effective discharge path length can be secured in a restricted space, and the efficiency of light emission can be improved. Brightness exceeding that of a compact fluorescent lamp can be obtained.

[0008]

EXAMPLE After applying the phosphor to the inner surface of the glass tube, the electrode parts are sealed at both ends thereof to form a U-shape. The lamp may be U-shaped with a bulge. Further, these processes may be performed before the electrodes are sealed in the glass tube.

The glass tube near the top and the electrode of the U-shaped lamp was gripped, and twisted in the range of 45 to 180 degrees while heating and softening the glass tube for processing. In this way, the processed lamp not only obtains a compact shape, but also fits a spherical globe, despite the long lamp length.

As described above, for example, the vicinity of the electrode portion of the lamp formed in a U shape and the top portion are grasped,
A twist of 90 degrees was added while heating to obtain a curved tube shape as shown in a, b or c, d of FIG. At this time, an inert gas blow having a pressure higher than the atmospheric pressure was injected from both ends of the lamp or an opening on one side.

[0011]

As a result, a compact lamp having high luminous efficiency can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view of a fluorescent lamp shape according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a conventional compact fluorescent lamp.

Claims (4)

[Claims] 1. A compact fluorescent lamp having a built-in lighting circuit or being mounted on a device as a single lamp, wherein the luminous bulb is twisted. 2. A fluorescent lamp characterized in that a U-shaped lamp is further twisted within a range of 45 to 180 degrees while gripping and heating the top of the lamp. 3. A method for producing a fluorescent lamp, which comprises heating the lamp into a U-shape and then heating the lamp while gripping the top of the lamp to add twist in the range of 45 to 180 degrees. 4. A compact fluorescent lamp comprising a luminous bulb in which straight tube luminous bulbs are three-dimensionally deformed and arranged, and a discharge path of the luminous bulb other than an electrode forming portion of the deformed and arranged luminous bulb. A compact fluorescent lamp where there are virtually no parallel parts.