JPS60172162A - Tubular bulb - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improvements in tubular light bulbs for use in stores and general lighting.

Conventional Structures and Problems There has been a trend toward downsizing of light sources for stores and general lighting, and compact, high-efficiency halogen light bulbs have been used in the past.

However, although such halogen light bulbs are small and highly efficient, they use quartz glass and encapsulate halogen, so they have high material costs and are complicated to manufacture.
As a result, the man-hour costs were high and the lamp price was practically high.

In addition, since it is made of quartz glass, if it is touched with bare hands, it may devitrify during lighting, leading to an early drop in luminous flux or premature end of life.

OBJECTS OF THE INVENTION The present invention obviates the above-mentioned drawbacks and provides a compact, highly efficient and inexpensive tubular light bulb.

Structure of the Invention The present invention is characterized by a tubular light bulb in which a filament is provided in a glass tube made of aluminosilicate glass and a mixture of krypton, argon, and nitrogen is sealed therein.

Description of examples Examples of the present invention will be described below.

The outer diameter of the tube is 208 mm, and the composition is Si, 0□62 mm by weight,
M120317, B2034, M, 07.

(BOs%) A filament consisting of a tungsten double coil made with a 100 V 150 W design was installed in a glass tube made of aluminosilicate, the remainder of which was a very small amount of oxide, and the volume ratio was 76 inches of Lipton, 15 inches of argon, A mixed gas consisting of 10% nitrogen is charged at a pressure of 670T.
A single-cap tubular light bulb with a total length of 76 mm was produced by enclosing it with Qrr. In addition, a metal getter made of zirconium was installed inside the bulb.

In addition to manufacturing the above-mentioned tubular light bulb, for comparison testing, soda glass for general incandescent light bulbs has drawbacks in terms of heat resistance, so borosilicate glass, which has a higher softening point than soda glass, was used to create the same dimensions and design as above. A tubular light bulb with

Borosilicate glass is 70% 5in2 by weight, B2O
5 is 20% y A (hos is 2chi, Na2O and 2
The composition used was 7% 0 and the remainder was a very small amount of oxide.

We compared the lighting characteristics of the above two types of tubular light bulbs with a halogen light bulb with a rating of 100"/150W (tube outer diameter: 14 g, 111 mm, total length: 68 words). As a result, the tubular light bulbs made of borosilicate glass had better performance than the glass tube. It swelled during lighting and became unusable at an early stage.On the other hand, tubular light bulbs made of aluminosilicate glass did not cause any abnormalities in the glass tube during lighting, had an initial luminous flux of 2,400 lumens, and had a lifespan of 1,600 hours. The above results showed properties equivalent to those of halogen light bulbs.Also, even when touched with bare hands, no devitrification of the glass occurred throughout the life of the glass.In other words, when using borosilicate glass, the maximum operating temperature of the glass Since the temperature is about 600'C, it becomes necessary to maintain the heat resistance limit by using a glass tube with a considerably larger diameter than that of a halogen bulb.

On the other hand, when using aluminosilicate glass,
Since the maximum operating temperature of glass is approximately 600'C,
Even though the power is quite high at 150W, it can maintain a compact size even if it has a slightly larger diameter than a halogen bulb, and it uses krypton, which suppresses tungsten evaporation as much as possible, and argon-nitrogen, which is normally used in general bulbs. Since the bulb is added to the filler gas and sealed, the initial luminous flux, lifespan, and luminous flux maintenance rate are on the same level as halogen bulbs.

In addition, by using a large amount of krypton, which reduces heat convection loss in the glass tube and suppresses evaporation of the tungsten filament, we can use krypton-argon without using any argon at all, without changing the characteristics of krypton-argon. Since a ternary mixed gas composition of nitrogen can be applied,
It is also practical in terms of material costs, such as saving on the amount of expensive Lipton used.

Note that krypton is added to the aluminosilicate glass tube of the present invention.
The tubular light bulb filled with argon-nitrogen mixed gas can be used as a substitute for various wattage tubular halogen light bulbs other than the tubular light bulb of the example, and the krypton T argon-nitrogen mixture ratio, filling pressure, and The encapsulated getter material, the composition of the aluminosilicate glass, the dimensions of the glass tube, etc. are not limited to the examples.

As described in detail, the tubular light bulb of the present invention does not use quartz glass or halogen gas, so the material cost is low, and it has improved effects such as saving money by using expensive Lipton together with argon. are doing. Furthermore, since it does not contain halogen and does not use quartz, it is easy to process and manufacture, reducing man-hours, and has practically the same characteristics as halogen light bulbs, and is a tubular light bulb that is almost similar in size. can be manufactured at low cost.

It should be noted that ordinary light bulbs filled with krypton are known, and in this case, there are those shaped like a soda glass container or shaped into a ball. For example, in the case of eggplant shape 1
For a 50W light bulb, the glass container is quite large, with an outer diameter of 75 mm and a total length of 166 mm, making it unsuitable for use in places where small halogen light bulbs are used, or for stores.

Therefore, the tubular light bulb of the present invention can be used as a substitute for conventional halogen light bulbs.

In addition, in the tubular light bulb of the present invention, the glass seal at the end of the cap side can be pinch-sealed in the same way as a halogen light bulb, and if necessary, the molybdenum foil as a conductive material located in the sealing part of a halogen light bulb can be omitted. It also has the advantage of reducing costs in terms of materials, man-hours, etc.

Claims (1)

[Claims] A tubular light bulb characterized in that a filament is provided in a glass tube made of aluminosilicate glass and a mixed gas of krypton, argon, and nitrogen is sealed.