JPS60143560A - Compact-type fluorescent lamp - Google Patents

Abstract

PURPOSE:To reduce the loss of the luminous flux of a compact-type fluorescent lamp so as to improve its efficiency by installing a double-U-shaped emission tube in an outer tube globe and providing a light-reflecting means on the inner surface of a base plate used to seal the outer tube globe. CONSTITUTION:A double-U-shaped emission tube 1 contains electrode coils 5 and 6 in its ends and the inner surface of the emission tube 1 is coated with a phosphor. After the emission tube 1 is airtightly fused to a metallic base plate 4 and installed in an outer tube globe 2 the inner surface of which is coated with a white diffusion layer 1, the globe 2 is charged with mercury and argon gas thereby constituting a compact-type fluorescent lamp. The emission tube 1 has a part 9 which is spatially connected to the globe 9. A metallic plate 12 coated with a light-reflecting film 13 composed of tiatanium oxide or similar compound is superimposed on the inner surface of the base plate 4 in order to reflect light from the emission tube 1 outside the globe 2. As a result, light is prevented from being absorbed by the base plate 4, thereby enabling the luminous flux of the lamp to be increased with the same input.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compact fluorescent lamp.

Conventional configuration and its problems 2. Recently, various compact fluorescent lamps have been proposed as energy-saving light sources to replace incandescent light bulbs.

FIG. 1 shows a compact fluorescent lamp of the outer tube vapor pressure regulation type previously proposed by the applicant. A so-called double U-shaped arc tube 1, which is an OU-shaped arc tube bent again, is held inside an outer tube globe 2. ing.

A metal substrate 4 made of stainless steel is sealed to the opening 3 of the outer globe 2 with a glass frit (not shown). The metal substrate 4 has glass stems 7.8 for holding electrodes 5.6 provided at both ends of the arc tube 1.
are sealed using the same glass material (not shown). The arc tube 1 is provided with a conductive portion 9 that spatially communicates with the outer bulb globe 2, and a phosphor 1 is provided on the inner surface of the conductive portion 9.
o is attached. Further, both ends of one arc tube 1 are fixed to a metal substrate 4 with glass frits (not shown). Mercury and rare gas are sealed inside the arc tube 1 and the outer bulb globe 2. Furthermore, a white diffusion material 11 is coated on the inner surface of the outer tube globe 2. Incidentally, in many cases, the lamp device is such a compact fluorescent lamp with a lighting ballast and the like integrated therein, and is further equipped with a light bulb base.

The above-mentioned compact fluorescent lamp has the following characteristics: 1 The mercury vapor pressure when the arc tube 1 is lit is regulated by the tube wall temperature of the outer tube globe 2, so the mercury vapor pressure increases excessively from the standpoint of lamp efficiency. It is maintained at almost the optimum level without any However, the inventors investigated the rate at which light from one arc tube 1 was effectively radiated to the outside of the outer tube globe 2 in such a compact fluorescent lamp of the outer tube vapor pressure regulated type, and found that it was about 80%. there were. Namely.

There is a relatively large luminous flux loss of about 20% of the light from the arc tube 1, which can be said to be one drawback of this type of compact fluorescent lamp.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a compact fluorescent lamp which reduces the loss of the lamp luminous flux, improves the lamp efficiency, and is highly suitable for mass production. SUMMARY OF THE INVENTION In order to achieve the above object, the inventors investigated the cause of the luminous flux loss in the compact fluorescent lamp shown in FIG. As a result, it was found that a part of the light reaching the metal substrate 4 provided in the opening 3 of the outer globe 2 was absorbed and was not radiated to the outside of the outer globe 2. - When mass-producing a lamp that suppresses such loss of luminous flux, it is possible to provide the inner surface of the metal substrate 4 with a reflecting means such as a metal plate with high light reflectance or a metal plate with a white reflective film formed on the surface. It turned out to be extremely effective. Such a configuration reduces the luminous flux loss from about 20% to about 10%.
%, and a compact fluorescent lamp with improved lamp efficiency was realized.

That is, one aspect of the present invention is that a bent thin arc tube is held inside an outer tube globe whose opening is hermetically sealed by a substrate, electrodes are provided at both ends of the arc tube, and A phosphor is coated on the inner surface of the tube, and mercury and rare gas are sealed inside the outer tube globe and the arc tube, and the outer tube globe and the arc tube are spatially connected to each other. The compact fluorescent lamp according to the present invention is characterized in that the compact fluorescent lamp is provided with a reflecting means for reflecting light from the arc tube on the inner surface of the substrate.

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

FIG. 2 shows a compact fluorescent lamp which is an embodiment of the present invention. What is different from the one in Figure 1?

A metal plate 12 having a light reflecting film 13 formed of titanium oxide or the like formed on its surface is superposed and fixed on a metal substrate 4. The table below shows the specifications and characteristics of such a fluorescent lamp in comparison with a fluorescent lamp without such a light reflecting film.

As is clear from the table at the top of page 6, in the fluorescent lamp of the present invention, the luminous flux at the same lamp input is increased by about 10% compared to the previous fluorescent lamp. This is 1 arc tube 1
This is because, unlike previous lamps, part of the light from the lamp is not absorbed by the metal substrate 4, but is reflected by the light reflection film 13 formed on the surface of the metal plate 12 and is finally radiated to the outside of the outer tube globe 2. be.

In addition, the inventors have also considered providing the light reflecting film 13 directly on the inner surface of the metal substrate 4 in a lamp having the structure shown in FIG. The effect was obtained. However, metal substrate 4
If the light reflective film 13 is applied on top of the lamp, the reflective film material may adhere to the glass lift sealing portion during mass production of lamps, causing accidents such as leakage.

Therefore, it has been found that the structure shown in FIG. 2 is superior in terms of mass production of lamps. Furthermore, even when the inner surface of the metal plate 12 was coated with silver plating having a high light reflectance instead of a white reflective film such as titanium oxide, almost the same effect on increasing the luminous flux was obtained.

As mentioned above, according to the present invention, the luminous flux loss of about 20% of the lamp having the structure shown in FIG. This is due to light absorption by the coated outer bulb globe 2. Therefore, as long as such a diffusive outer tube globe 2 is used, it is difficult to significantly reduce the loss of the remaining 910%. In a type fluorescent lamp, by providing a reflection means for reflecting light from the luminous tube on the inner surface of the substrate that airtightly seals the opening of the outer tube globe, the luminous flux of the lamp can be reduced by approximately 10% using the same human power. %, and it is possible to provide a compact fluorescent lamp which is excellent in mass production.

[Brief explanation of drawings]

Page 9, FIG. 1 is a partially cutaway sectional view of a previously proposed compact fluorescent lamp, and FIG. 2 is a partially cutaway sectional view of a compact fluorescent lamp which is an embodiment of the present invention. 1... Arc tube, 2... Outer tube globe,
3...opening, 4...metal substrate, 6.
6... Electrode, 7, 8... Stem, 9.
...Conducting portion, 11...White diffusion material,
12...Metal plate, 13...Light reflecting film. Name of agent: Patent attorney Toshio Nakao
- (＼ 0 (Procedural amendment) March 26, 1985 To the Commissioner of the Patent Office, 1988 Patent Application No. 250934 2. Name of the invention Compact type fluorescent pump → 3. Person making the amendment Relationship with the case Special Permission Application Appointment Location 1006 Kadoma, Kadoma City, Osaka Prefecture Name (
584) Matsushita Electric Industrial Co., Ltd. Representative: Mr. Fujimoto 4 Agent Address: 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 6 Target of amendment 2B17P6 Contents of amendment (1) I will amend the statement in the scope of claims column of the specification as per paper 53110 (2) "Internally," on page 4, lines 19-20 of the specification.
We will correct "of the bent tube" to "inside". 2. Scope of Claims An arc tube is held inside an outer bulb globe whose opening is hermetically sealed by a substrate, electrodes are provided at both ends of the arc tube, and a phosphor is provided on the inner surface of the arc tube. a compact fluorescent lamp, wherein the outer bulb globe and the arc tube are sealed with mercury and a rare gas, and the outer bulb globe and the arc tube are in spatial communication with each other. A compact fluorescent lamp characterized in that the inner surface of the substrate is provided with a reflecting means for reflecting light from the arc tube.

Claims (1)

[Claims] A bent thin arc tube is held inside an outer tube globe whose opening is hermetically sealed by a substrate.
Electrodes are provided at both ends of the arc tube, a phosphor is coated on the inner surface of the arc tube, and mercury and a rare gas are sealed inside the outer bulb globe and the arc tube,
A compact fluorescent lamp in which the outer tube globe and the arc tube are in spatial communication with each other, characterized in that the inner surface of the substrate is provided with a reflecting means for reflecting light from the arc tube. A compact fluorescent lamp.