JPS59201362A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To provide a compact fluorescent lamp with good eyesight and high efficiency. CONSTITUTION:When a holder 4 to which inner tubes 3a, 3b and 3c adhere is positioned and secured on top of a stem 2, a discharge path is formed by the connection paths D1 and D2 of the bottom opening and the top of the stem 2. In addition, since an inner tube insertion hole B3 and a hole A are connected by an open path that is opened to the inside surface E of the holder, the inside and outside of the inner tubes 3a, 3b, and 3c have the same airtightness and mercury vapor can freely pass through the inside and outside of the inner tube 3. Since the vapor pressure is determined by the tube wall coolest temperature of an outer tube 1 separated from the inner tube 3, almost optimum violet ray radiation is possible and high efficiency can be achieved independently of its compact size.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a compact fluorescent lamp in which an inner tube is housed in an airtight space formed by an outer tube and a stem, and the inner tube serves as a discharge path.

(Background technology) In recent years, against the backdrop of energy conservation, in the field of light sources, the principle of fluorescent lamps, which have the great advantages of high efficiency and long life, has been used to replace the principle of fluorescent lamps, which have the fatal disadvantages of low efficiency and short life. A fluorescent lamp with a compact structure that can replace an incandescent light bulb is being actively studied.

In line with this trend, the present applicant has developed a plurality of curved inner surfaces in which a fluorescent material can be applied to the inner surface of the airtight space formed by the outer tube and the stem via a disc-shaped holder that is fixed to the stem. A fluorescent lamp has been proposed in which a series of discharge paths are formed by a tube and communication paths provided in the inner tubes and the holder, and a pair of electrodes are disposed at both ends of the discharge path.

FIGS. 1 and 2 show an example of the above-mentioned fluorescent lamp, and in the figures, 1 is an outer tube, 2 is a stem, and 3a.

3b and 3c are inner tubes that can be bent into a U-shape, 4 is a holder, and 5
is a phosphor, 6 is a communication path with an opening on the top surface, 7 is a communication path with an opening on the bottom surface, 8 is an adhesive for fixing the inner tubes 3a, 3b, and 3c to the holder 4, 9 is an electrode, and 10 is for fixing the holder. The holder 4 is positioned and fixed on the upper surface of the stem 2 by bending the tip along the enclosing line. 11 is an exhaust pipe.

In such a fluorescent lamp, the stem 2 and the holder 4 do not necessarily need to be hermetically sealed;
, 3b, 3c are fixed to it, a series of discharge paths can be formed by simply placing the holder 4. Therefore, a compact size firefly with double tube structure and high efficiency achieved by making the inside and outside of the inner tube equally airtight. Although it is a light lamp and is easy to manufacture, the holder 4 has the following problems.

■ Since one of the communication channels 6 is open at the top, when the lamp is lit, the blue luminescence of mercury leaking from the communication channel 6 can be seen in the white or bulb-colored light emitted by the phosphor 5, creating an unfavorable visual impression. was giving.

■ If the holder 4 is made of ceramic, the communication path 6
．． 7 is located on the upper and lower surfaces of the holder 4, the shape becomes unbalanced on the upper and lower surfaces, resulting in large deformation distortion during molding, resulting in poor processing yield.

(Object of the Invention) The present invention was made in view of the above-mentioned problems, and its object is to provide a compact fluorescent lamp that is visually pleasing and highly efficient.

(Disclosure of invention) Hereinafter, the present invention will be explained with reference to FIGS. 3 and 4.

FIG. 3 is a plan view showing an embodiment of the holder according to the present invention. The disc-shaped holder 4 is made of ceramic, and a hole A is provided in the center, and around the hole A there is approximately Six inner tube insertion holes B1 to B6 are provided at equal intervals, and each inner tube insertion hole B1 to B6 has inner tubes 3a, 3b, and 3c.
A crotch seat C is provided to facilitate the fixation of the inner tube, and the inner tube insertion hole B2 and the inner tube insertion hole B3 are connected to a communication path D having an opening on the bottom surface.
1, the inner tube insertion hole B4 and the inner tube insertion hole B5 are connected by a communication path D2 opened on the bottom surface, and the inner tube insertion hole B3 and the hole A are connected.
are connected by an open passage F of a lower surface opening opening to the inner side surface E of the holder forming the ignition. In addition, the thickness of the opening forming the open path F is 611 from the relationship of exhaust efficiency, which will be described later.
It is preferable that the angle is not less than angle IIIl. Further, G in the figure is a notch for engaging the enclosing wire.

FIG. 4 shows a holder 4 having such a structure assembled in the same manner as the conventional example, and this figure is a cross-sectional view developed along the discharge path, and the enclosed wire for fixing the holder is shown as in the conventional example. When the boulder 4 is positioned and fixed on the upper surface of the stem 2 by bending the tip of the stem 10, the communication path D of the lower surface opening is opened.
A discharge path is formed between I and D2 and the upper surface of the stem 2, and the discharge is caused from the electrode 9 inserted into the inner tube insertion hole B1 to the inner tube 3a, the inner tube insertion hole B2, Communicating#
@Route D1, inner tube insertion hole B3, inner tube 3b, inner tube insertion hole B4
, the communication path D2, the inner tube insertion hole B5, and the inner tube 3C to reach the electrode 9 inserted into the inner tube insertion hole B6.

Although it is the same in the conventional example, a part of the discharge path is connected to the airtight space formed by the outer tube 1 and the stem 2 via the open path F (in the conventional example, the communication path 6 is opened at the top). The purpose of opening the inner tubes 3a, 3b, and 3c is to efficiently exhaust the air inside the inner tubes 3a, 3b, and 3c at the same time when the airtight space formed by the outer tube 1 and the stem 2 is exhausted from the exhaust pipe 11. If there were no such open path F, the exhaust inside each inner tube 3a, 3b, 3c would be carried out through a small gap created between the upper surface of the stem 2 and the lower surface of the holder 4, which would be sufficient in terms of conductance. Therefore, proper exhaust and degassing cannot be expected, and therefore normal lamp characteristics cannot be ensured. Further, although the same is true of the conventional example, the fluorescent lamp according to the present invention allows the inner tube 3 to be
The inside and outside of a, 3b, and 3c are equally airtight, and mercury vapor can freely enter and exit the inside and outside of the inner tube 3, and the vapor pressure is equal to the coldest temperature of the tube wall of the outer tube 1, which is far from the inner tube 3, which is the discharge part. Since it is determined by This also contributes to high efficiency during the initial stage of lighting.

6- Note that the present invention is not limited to the above-mentioned embodiments. For example, the communication paths DI, D2 and the open path F formed in the holder 4 do not need to be in the shape of a groove with an open bottom surface, but may be in the shape of a tunnel. The inner tube 3 need not be limited to a U-shape, but may be any bent tube with both open ends substantially on the same plane, and it goes without saying that it may be two or more. There is no such thing.

(Effects of the Invention) As described in ``-'', the present invention applies a phosphor to the inner surface of an airtight space formed by an outer tube and a stem via a disc-shaped holder fixed to the stem. A plurality of bent inner tubes are arranged, a series of discharge paths are formed by communication paths provided in each inner tube and the boulder, and a pair of electrodes are arranged at both ends of the discharge path. A fluorescent lamp comprising: a hole provided in the center of the holder, and an open path that opens only on the inner surface forming the hole and connects to the second discharge path, Since the open channel does not open on the top surface but on the inner surface, the leakage of mercury emission is reduced to the extent that it does not pose a visual problem, providing a highly efficient and compact fluorescent lamp with improved commercial value. can. In addition, if two communication channels molded with ceramic are formed in the openings on the bottom surface as in the above embodiment, the shape of the holder becomes more symmetrical, which improves the yield of molding and reduces costs. There are also additional effects.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the conventional example, Figure 2 is a plan view of the same, and Figure 3 is a perspective view of the conventional example.
FIG. 4 is a plan view showing an embodiment of the holder according to the present invention, and FIG. 4 is a cross-sectional view showing a fluorescent lamp according to the present invention constructed using the above-mentioned holder, developed along a discharge path. 1...Outer tube, 2...Stem, 3...Inner tube, 4...
・Holder, 5... Fluorescent material, 9... Electrode, A...
Hole, D...connection road, F...open road. Patent distributor Matsushita Electric Works Co., Ltd. Agent Patent attorney Toshimaru Takemoto (and 2 others)

Claims (1)

[Claims] (1) In the airtight space formed by the outer tube and the stem, a plurality of bent inner tubes whose inner surfaces are coated with a phosphor are arranged via a disc-shaped holder fixed to the stem, and In a fluorescent lamp, a series of discharge paths are formed by communication paths provided in each inner tube and the boulder, and a pair of electrodes are arranged at both ends of the discharge path, and a hole is provided in the center of the holder. . A fluorescent lamp characterized in that an open path is provided only on the inner surface forming the hole and connected to the discharge path.