JPS60117537A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To improve optical output during a lamp is lighting with a high frequency power supply by setting the external bulb length and internal bulb length to the particular values and by filling the inside with the predetermined amount of argon gas in a fluorescent lamp of double-bulb structure comprising the U- shaped internal bulb forming the discharge path. CONSTITUTION:A compact size fluorescent lamp is formed with such a double- bulb structure as comprising an external bulb 1 forming the sealed space and the U-shaped internal bulbs 2 which are sealed within the external bulb 1 and form the discharge paths. In case of lighting such fluorescent lamp with a high frequency power supply, the external bulb length L is set in the range of 75mm.<=L <=80mm. and the internal bulb length is set in the range of 58mm.<=l<=65mm. and simultaneously the sealed space is filled with the argon gas in the pressure of 3.5Torr. Accordingly, a high optical output can be obtained by setting the external bulb length to such a value not deteriorating a compact lamp size and the internal bulb length l to a value which minimizes a lamp power required for obtaining the same optical power.

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 a discharge space formed by an outer tube and a stem, and the inner tube serves as a discharge path. .

(Background Art) Fig. 1 is a perspective view showing an example of a compact fluorescent lamp, which consists of a lamp part A, a lighting part B, and a screw cap part C. Fig. 2 is an exploded perspective view of the lamp part A. It is a diagram.

The lamp section A consists of an outer tube 1, a U-shaped inner tube 2, a spacer 6, and a stem 4. The inner wall of the inner tube 2 is coated with a phosphor 5 and fired. Six inner tube insertion holes 7a to 7f having counterbores s6 for positioning and fixing both ends are provided. Among the six inner tube insertion holes 7a to 7f, insertion holes 7a that are aligned with each other,
Reference numeral 7b denotes a delivery hole 8 which is open in the vertical direction, and the other adjacent insertion holes 7d and 7e in the housing are connected by a communication groove 9 which is open only on the surface. The communication hole 8 is provided by
A space formed by the outer tube 1 and the stem 4, and each of the inner tubes 2
This is to share the same space for vomiting. 10 is stem 4
This is a spacer fixing encapsulating wire insertion groove for fixing the spacer 3 thereon. The stem 4 has four lead wires 11 and 4.
An enclosed wire 12 for fixing the spacer is enclosed, and an electrode 13 is attached to the tip of the lead wire 11.

Note that 14 is an exhaust pipe.

Next, let's talk about assembly. First, both open ends of each inner tube 2 are fitted into the counterbore portions 6 of the inner tube insertion holes 7a to 7f, and then attached to the spacer B with an adhesive such as a heat-curable heat-resistant inorganic adhesive or glass frit. Fix airtightly. This airtight fixation does not necessarily require airtightness as long as the gap created between the outer wall of the inner tube 2 and the counterbore 6 of the spacer 6 is made small. Next, the spacer 3 integrated with the inner tube 2 in this way is attached to the stem 4, and both electrodes 16, 16 provided on the stem 4 and the encapsulated wire 12 for fixing the spacer are attached to the stem 4.
They are arranged so as to correspond to the inner tube insertion hole 7C17f provided in the spacer 6 and the enclosing wire insertion groove 10, respectively. The spacer 6 and the stem 4 are fixed by bending the spacer fixing encapsulation wire 12 inward toward the upper surface of the spacer B. Through this step, i&11 and each inner tube 2 are connected in series to form one discharge path. Stem 4 of spacer 6
Fixing to the cap does not necessarily require airtightness if the cap is made small. After the open end of the outer bulb 1 and the outer periphery of the stem 4 are hermetically sealed, the lamp part A is completed by performing the usual electrode material activation treatment, exhausting, and filling with discharge gas and mercury from the exhaust pipe 14. do.

Therefore, such a fluorescent lamp has a power source for drawing, that is, 50~
60■zo) It is designed to efficiently light up at the operating frequency. To explain it with a specific example, from the viewpoint of ambient temperature characteristics and starting performance, argon gas is used as a discharge gas in the pipe. The lamp size is 75 mm and the diameter of the outer tube is 60 mm, so that the lamp size is comparable to a 60 watt incandescent bulb, and the light output is 8007 m, which is equivalent to a 60 watt incandescent bulb. In order to secure this number, we have hired 55 Uchikancho l.

However, when the above-mentioned fluorescent lamp is lit at high frequency, it is impossible to obtain the local light output, which is a feature of high-frequency lighting.

(Object of the Invention) The present invention has been made in view of the above points, and its object is to provide a fluorescent lamp that can easily obtain high light output during high frequency lighting without compromising the compact size of the lamp. is to provide.

(Disclosure of the Invention) The present invention will be explained below. FIG. 6 is a front view of a lamp section (corresponding to the lamp mA shown in FIG. 1) for explaining the present invention. The structure is the same as that of the lamp section A of the fluorescent lamp, so the explanation will be omitted by giving the same reference numerals to the same parts.

First of all, in order not to spoil the compact size of the lamp,
As mentioned above, the external length must be ≦80 brains.

Under these conditions, we prototyped a lamp in which the outer tube length and the inner tube length l were greatly varied, and the lighting frequency was approximately 5QKH.

Figure 4 shows the results of measurements taken with the lights on. In addition, in the same figure, the horizontal axis is the lamp power [W], and the vertical axis is the light output C1m.
"J", and the numbers in the figure, for example 75150, indicate that the outer tube length is 75 heads and the inner tube length l is 5011.

As is clear from Figure 3, the foreign currency length and the inner pipe length 1'-)
As the difference decreases, the ratio of increase in light output to increase in lamp power decreases. This is because as the temperature of the coldest part of the lamp increases, the amount of evaporation of mercury sealed in the tube increases, and ultraviolet photons are lost due to self-absorption of mercury.

In addition, from FIG. 3, in the case of lFf+- Naikancho, the coldest wire temperature of the pigeon lamp with a long outer tube length is lower, so the loss due to the above self-absorption is reduced, and the light output is increased. i
It can be seen that in order to secure a light output of o o o j'm, the outer pipe length needs to be 75 or more. Therefore, the length of the outer tube must be 75g1g≦L≦80M.

Next, by making the inner 1" length l variable, there is a range of inner tube length where the lamp power required to emit 10007 In of light is minimum, and when the outer tube length L = 80M, the front view of the lamp section ,
FIG. 4 and FIG. 5 are characteristic diagrams, respectively.

1...Outer 1.2...Inner pipe, L...Outer pipe length, L...
・Inner manager.

patent applicant Matsushita Kameko Co., Ltd. Representative Patent Attorney Toshimaru Takemoto (2 people) Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A double tube structure consisting of an outer tube that forms an airtight space and a U-shaped inner tube that is placed inside the outer tube and forms a discharge path, and the inside and outside of the inner tube are the same airtight space. In the fluorescent lamp, the length of the outer tube and the length of the inner tube are 75u≦L≦80 and 58W≦l≦65 wrinkles, and argon gas is injected into the airtight space at 3°5T.
A fluorescent lamp characterized by containing 6rr,