JPS59123156A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To suppress reduction in the luminous flux of a compact fluorescent lamp by making the pressure of mercury in a nonlinear inner tube, installed in an outer tube, having U-shaped form or the like and used to form a discharge path, equal to that in an outer tube by providing the inner tube with a hole. CONSTITUTION:A nonlinear inner tube 6 used to form a discharge path, is made by curving a U-shaped glass tube again in U form and charged with mercury and a rare gas. Next, the inner surface of the tube 6 is coated with a phosphor and a hole 9 is provided in the tube 6. Then electrodes 1 and 2 are installed in the end portions of the tube. After that, the ends of the tube 6 are fixed to a base plate 7 by means of frit glass 8 before they are installed in an outer tube 5, thereby constituting a compact fluorescent lamp. Therefore, owing to the hole 9, the pressures of mercury vapor and the rare gas in the inner tube 6 can be made equal to those in the outer tube 5. As a result a high optical output can be obtained by suppressing reduction in the luminous flux by causing the lamp to perform electric discharge without providing the inner tube 6 with any lacking parts such as an opening.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compact fluorescent lamp having a discharge path body for regulating the discharge path within the outer bulb.

2. Description of the Related Art Structure of Conventional Example and Its Problems Conventionally, as an example of this type of fluorescent lamp, the one shown in the figure on page 12 is known. That is, this fluorescent lamp has two discharge path bodies 3 each comprising a U-shaped glass tube having electrodes 1 and 2 at one end, open at the other end, and coated with a phosphor on the inner surface. 4 is provided in the outer tube 5,
Mercury and rare gas are sealed within this outer tube 6.

When this fluorescent lamp is lit with an external ballast and lighting tube connected in the same way as conventional fluorescent lamps, discharge occurs only at one electrode 1.
2 and the other electrode 2' through the gas space between the open ends of the discharge path bodies 3 and 4! , or 1. However, since the discharge between the opening ends does not contribute to light emission, this fluorescent lamp has the disadvantage that the total luminous flux is not high.

OBJECTS OF THE INVENTION The present invention provides a compact, high total luminous flux fluorescent lamp.

Structure of the Invention The present invention seals a base to the opening of an outer tube, and in this outer tube,
A discharge path body is provided which has a glass tube with electrodes hermetically sealed at both ends, mercury and a rare gas sealed inside, and a phosphor 3-base S. coated on the inner surface. By providing holes in the tube, the reduction in luminous flux of the compact fluorescent lamp is suppressed.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 shows a perspective view of a fluorescent lamp which is an embodiment of the present invention. In the figure, the discharge path body 6 has a non-linear glass tube with electrodes 1 and 2 hermetically sealed at both ends and a phosphor coated on the inner surface. In this example, a U-shaped glass tube bent into a U-shape is used as the non-linear glass tube, but it is also possible to use a U-shape or various other shapes. Both ends of the discharge path body 6 are fixed to a base 7 made of metal with an adhesive 8 such as low melting point frit glass. and,
A discharge path body 6 fixed to the base body 7 is provided inside the outer tube 6,
The opening of this outer tube 6 is similarly sealed to the base body 7 with an adhesive such as low melting point glass.

A reservoir hole 9 is formed in the discharge path body 6 to make the mercury vapor pressure and rare gas pressure inside the discharge path body equal to those in the outer tube.

Furthermore, regarding the above fluorescent lamp, FIGS. 3(a) and (b)
) and FIGS. 4(a) and 4(b).

As shown in FIG. 3(a), (■), the base body has a groove 1o at its peripheral edge, and inside thereof two depressions 11 and 12 for receiving both ends of the discharge path body 6. A recess 13 is formed to receive and support the bent portion of the discharge path body 6. A hole 14.15 is formed in the tube of each sparrow of the recess 11.12.

Then, the base body 7, the discharge path body 6, and the outer tube 5 are assembled in the following manner. That is, the lead wire 16 led out from the discharge path body 6 is inserted into the hole 14 of the base body 7, which is formed by pressing a metal plate made of iron-Nisokel alloy, etc., which has excellent adhesion to low-melting frit glass.
Pass the lead wire 17 and exhaust thin tube 18 through the base body 7, insert both ends of the discharge path body 6 into the recessed part 11°5 page 12, and insert the four parts 13
The bent part of the discharge path body 6 is inserted into the base 7, and the discharge path body 6 is inserted into the base 7.
support. Then, after filling the four parts 11 and 12 with low melting point frit glass, the same low melting point frit glass is filled over the entire groove 10 of the base body 7, and the open end of the outer tube 3 is inserted into this groove 10, The whole is heated at a temperature of 400 to 500°C. Then, the low melting point frit glass melts, and the base body 7, the discharge path body 6, and the outer tube 6 are integrally fused at predetermined locations, and the base body 7 is hermetically sealed to the opening of the outer tube 6. After that, the inside of the tube is evacuated through the exhaust tube 18, the electrodes 1.2 are processed, and mercury and rare gas are sealed inside the tube through the exhaust tube 18, and the exhaust tube 18 is sealed to complete the fluorescent lamp. do.

Note that a diffusion film may be provided on the inner surface of the outer tube 6, or a fine uneven pattern may be provided on the inner and outer surfaces.

Next, the operation and characteristics of the above fluorescent lamp will be explained.

When such a fluorescent lamp is connected to a ballast and a lighting tube and turned on, a discharge occurs between the electrodes 1 and 2 of the discharge path body 6, and the discharge path body 6 emits light uniformly. In other words, unlike conventional fluorescent lamps, this fluorescent lamp does not have a missing part in the center of the discharge path that contributes most to light emission, so it has the same discharge path length and the same input power as conventional fluorescent lamps. Compared to a fluorescent lamp, the total luminous flux is improved by about 20 times.

The fluorescent lamp of the present invention has the following surface effect by providing holes in the discharge path body.

On the other hand, even if no hole is provided in the discharge path body, the discharge path body normally emits light and lights up. However, in this case,
Since the airtight discharge path body has a structure further sealed by the outer tube, the wall surface temperature of the discharge path body during lighting increases significantly, and the internal mercury vapor pressure also increases accordingly. As a result, the effectiveness of this fluorescent lamp is significantly reduced.

On the other hand, when holes 9 are provided in the discharge path body 6 as in the fluorescent lamp of the present invention, although the wall surface temperature of the discharge path body 6 increases, the internal mercury vapor pressure is lower than the temperature of the outer bulb 6. Therefore, in this firefly lamp, a decrease in luminous flux is avoided and a decrease in efficiency is suppressed.

It is preferable that the size of the hole provided in the discharge path body be large, but if it is too large, the mechanical strength of the discharge path body will be reduced and the effective light emitting area will also be reduced; When exhausting the air inside the outer tube from the exhaust capillary through this hole, there are problems such as the time it takes to exhaust the air completely, so the diameter of the hole is preferably about 3 to 10 mm, and there are still several. Good too. In the case of one hole, the hole may be placed in any part, but in the case of multiple holes, if the holes are provided close to the electrode part, the discharge will be located in the discharge path. Since there is a possibility that the discharge path does not occur inside the body but occurs outside the body through the holes, it is important to provide the discharge path as far away from the electrode as possible and so that the holes do not come close to each other. - Another feature of the fluorescent lamp according to the embodiment of the present invention is that it has strong mechanical strength. In other words, since the discharge path body is integrally molded with a glass tube, sufficient mechanical strength can be maintained simply by fixing the vicinity of both electrodes to the base body, and vibrations and
Accidents such as damage to the discharge path body due to impact do not occur at all. This is particularly advantageous in the case of long discharge path bodies.

In the fluorescent lamp according to the embodiment of the present invention, the dimensions of the discharge path body can be freely changed, that is, the diameter of the glass tube of the discharge path body and the distance between the electrodes can be freely selected.
It has the advantage that input power can be determined over a wide range.

Next, a specific example of the fluorescent lamp of the present invention will be explained.〇 A glass tube with an outer diameter of 16 holes and a distance between electrodes of 270+ nm is bent into a U shape, and then folded in half, and a hole with a diameter of 3 mm is formed into 2 holes. A discharge path body provided with two discharge paths was fixed with low melting frit glass to a base made of a press-formed alloy plate of 50% Fe-50% Ni, and an outer tube with a diameter of °C and a length of 90 mm was attached to the base in the same manner. Make it stick. After evacuating the inside through the exhaust capillary, mercury and argon are sealed inside the discharge channel body and the outer tube to produce a fluorescent lamp. The inner surface of the discharge path body is coated with a white phosphor, and the inner surface of the outer tube is coated with a white phosphor.
An appropriate amount of white diffusion film was applied to the inner surface of the base.

When the fluorescent lamp was lit with a 10W ballast and tested, a total luminous flux of 660 lumens was obtained with an input power of 12W. This is an improvement in the total luminous flux value by a factor of 20 compared to the total luminous flux of 440 lumens obtained with the same input power using a conventional fluorescent lamp.

By integrating the fluorescent lamp of the present invention with a suitable base, it can be used in the same way as a normal fluorescent lamp.In addition, the fluorescent lamp of the present invention can be used in the same way as a normal fluorescent lamp by integrating it with a suitable base. By doing so, it is also possible to construct a light bulb base type fluorescent lamp.

DETAILED DESCRIPTION OF THE INVENTION As described in detail, the present invention includes a base body sealed in the opening of an outer tube, electrodes hermetically sealed at both ends of the outer tube, and mercury and a rare gas sealed inside. A discharge path body having a non-linear glass tube with a fluorescent material adhered to the inner surface is provided,
Furthermore, since the glass tube is provided with holes and there is no discharge path missing part as in the conventional example, a decrease in luminous flux can be suppressed, and the internal mercury vapor pressure is regulated by the outer tube temperature. It is compact and can avoid a decrease in luminous flux.
It is possible to provide a fluorescent lamp with high light output.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a conventional fluorescent lamp, Fig. 2 is a perspective view showing a fluorescent lamp according to an embodiment of the present invention, and Fig. 3(a) shows a base. A plan view and a sectional view taken along the line A-A, showing an example of the
The discharge path body and the outer tube are installed on the base cut along line B-B in Figure (a), and a cross-sectional view showing a part of the outer tube is cut away, and C-C in Figure 3 0)) FIG. 2 is a cross-sectional view showing a base cut along a line, with a discharge path body and an outer tube provided thereon, and with a part of the outer tube cut away. 1.2...Electrode, 6...Discharge path body, 7
...Base, 8...Adhesive, 9...
... Hole, 1o...Groove, 11゜12.13...
... Groove, 14.16 ... Hole, 18 ...
・Exhaust tube.

Claims (1)

[Claims] The discharge path body includes an outer tube having an opening at one end, a base sealed to the opening of the outer tube, and a discharge path body provided within the outer tube, and the discharge path body has electrodes at both ends. Hermetically sealed, with mercury and rare gas sealed inside.
', and has a non-linear glass tube with a phosphor adhered to its inner surface, a part of the glass tube is fixed to the base, and a hole is formed in the glass tube. Features a fluorescent lamp.