JPS6212048A - fluorescent lamp - Google Patents

Abstract

PURPOSE:To produce a small bulb type fluorescent lamp having uniform outer tube brightness distribution and light distribution characteristic by arranging such that the linear sections of three inner tubes will form a right hexagonal post while specifying the distance between adjoining linear sections. CONSTITUTION:Assuming the diameter at the bottom 2 of outer tube is 70mm while the width of sealing margin (dot line circle) against the outer tube is 3mm, it is found that good brightness distribution can be achieved if the distances d1, d2 between the linear sections of inner tube are approximately same and shorter than 5mm for 94% light transmission rate through the diffusion film 15 of outer tube by inspecting the brightness distribution and the light distribution characteristic of outer tube while varying said discharge d1, d2. Even when the diffusion film is made thinner or eliminated, such arrangement of inner tube may improve the appearance because the light emitting section will appear as an uniform block. The outer tube 1 and the bottom section 2 of outer tube are adhered (frit) through low melting point glass or adhered through fusion (welding).

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a fluorescent lamp, and particularly to a compact fluorescent lamp suitable for miniaturization.

[Background of the invention]

In recent years, bulb-shaped fluorescent lamps have appeared and are becoming popular as an alternative to incandescent lamps, which have low efficiency. As one of these,
There is a lamp having a structure described in Japanese Patent Application No. G-1132259 (see Fig. 2). This lamp has an outer tube 1 that forms an airtight space, and inner tubes 3 and 4 that define a discharge path.
．． 5 are connected in series via a spacer 13.

One of the spacers is an opening 14. The electrodes 6 and 7 are arranged at both ends of the inner tube connected in series. In the figure, 11 is a base, 12 is a screw, and 16 is a diffusion membrane. The space inside the outer tube 1 is filled with a small amount of mercury and a rare gas of several Torr. Although not shown in the diagram, inner pipes 3 and 4
．． A phosphor is coated on the inside of 5, and it emits light by converting the ultraviolet rays of mercury generated by a discharge as shown by the arrow in the figure into visible light. Spacer 13 with this lamp
Since there is an open part 14 in one place, the space inside the inner tube and the outer tube 1
The space inside is continuous. Therefore, the mercury vapor pressure inside the inner tube, which affects the efficiency of the lamp, is determined by the temperature of the coldest part of the outer tube 1. Since the outer bulb 1 has a large surface area, heat dissipation is facilitated, and a decrease in efficiency due to an excessive rise in lamp temperature, which is a problem when the power consumption of the lamp is increased, can be suppressed.

On the other hand, since this lamp is intended to replace incandescent light bulbs, it is required that the luminance distribution and light distribution characteristics of the outer bulb be uniform. However, this point is not taken into consideration in the known examples.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a compact compact fluorescent lamp with uniform outer tube brightness distribution and light distribution characteristics.

[Summary of the invention]

The uniformity of the lamp's light is improved by arranging the straight sections of the inner tube at equal intervals and with high density. Furthermore, under these conditions, we have found the conditions that make the lamp the most compact.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a view of the lamp of FIG. 2 viewed from the entrance direction. The diameter of the outer tube base 2 was 70 Am, and the width of the sealing margin (dotted line circle in the figure) with the outer tube was 3 mm. Using this lamp, the brightness distribution and light distribution characteristics of the outer tube were investigated by changing the distances d, d2 between the straight parts of the inner tube. As a result, it was found that when the diffused light transmittance of the diffusion film 15 of the outer bulb is 94%, a good brightness distribution can be obtained by setting it to d□2d2 and making it 5 mm or less.

Furthermore, even if the diffusion film is made thinner than this or the diffusion film is eliminated, the appearance will be improved because the inner tube is arranged according to the present invention and the light emitting part looks like a uniform mass.

FIG. 3 shows another embodiment. This is 2 of the 3 inner tubes.
The books are connected in series at the connection part 9, and the remaining one is connected to the open end 10.
The lamps are connected in series through the This lamp is easier to manufacture than the lamp of FIG. 2, which uses spacers 13 to connect the contents, and the lack of spacers also makes it easier to reduce the gap between the straight sections of the inner tube.

In the above lamp, the outer bulb 1 and the outer bulb base 2 are bonded together using low-melting glass (fritting) or by melting the material between them (welding). In either case, if the connecting portion (circumference at the base of the outer tube) is large, adhesion becomes difficult. Considering the yield, the upper limit for the diameter of the outer tube base is 70 mm. Furthermore, it is necessary to provide a sealing margin of at least 3 mm from the edges. Based on the above restrictions, the inner tubes 3 and 4.5 are arranged as shown in Figure 1, d, = d,
= O, the outer diameter of the inner tube is 21mmn1 (the inner diameter is 19mm
) is the upper limit. If the inner tube diameter is made thinner, the outer tube base 2 can be made smaller, but 1! The flow density increases and the efficiency of the lamp decreases. Practically, the lower limit of the inner diameter of the inner tube is 10 mm.

From the above, the appropriate inner diameter of the inner tube Φ(n+m) is 10≦Φ≦19.

Furthermore, in this lamp, a lighting circuit (ballast, starter) is built into the base 11, but it is cheapest to use a choke coil for the ballast. In Japan, the power supply voltage is generally 100V, so the lamp voltage is 54 to 60V.
It needs to be V.

To achieve this, we measured the relationship between the height H of the outer tube (see Figure 3), the inner diameter Φ of the inner tube, and the lamp voltage. The gas filled in the lamp is Ar2.5 Torr, and the current is 0.25 to 0.
．． It was set to 35A. Also, the force between the tip of the inner tube and the outer tube Q (
(see Figure 3) was 5-b. A is the easiest to make and is suitable for downsizing the lamp. H and Φ under the above conditions
Fig. 4 shows the relationship between the lamp voltage and the lamp voltage. As a result, the lamp voltage 54V line a is Φ=0.6H-26, and the lamp voltage 60V (7) line is O=0.54H-27,5't'
I found out that it was expressed. From the above, the lamp voltage is set to 5
To make it 4 to 60V, (Φ+26)/0.6≦H≦(
It is sufficient to maintain H at a value of Φ+27.5)/0.54.

This result almost holds true when the gas filled in the lamp is a mixed rare gas number Torr of 90% or more Ar. Kr and Ne
It is most desirable to use Ar as the filler gas, since mixing them in a ratio higher than this will be disadvantageous in terms of efficiency and flickering of the luminous flux.

〔Effect of the invention〕

According to the present invention, the outer tube luminance distribution and light distribution can be made uniform, and the lamp can be made smaller.

[Brief explanation of the drawing]

Figure 1 is a view from the entrance direction of the lamp in Figure 2; Figure 2;
Figure 3 is a configuration diagram of a compact fluorescent lamp, Figure 4 is the inner diameter of the inner tube,
It is a graph showing the relationship between outer bulb height and lamp voltage. 1... Outer tube, 2... Outer tube base, 3, 4.5...
Inner tube, 6.7... Electrode, 8... Exhaust pipe, 9... Connection part, 10... Open end, 11... Cap, 12... Screw-in, 13... Spacer, 14 ... opening, 15
...Diffusion membrane.

Claims (1)

[Claims] 1. An outer tube forming an airtight space, a base of the outer tube, three U-shaped inner tubes connected in series within the space, and an outer tube disposed at both ends of the series-connected inner tubes. In a fluorescent lamp consisting of two electrodes and an opening for the space provided in the inner tube, the straight portions of the three inner tubes are arranged so as to form a substantially regular hexagonal column, and the straight portions of the inner tubes are adjacent to each other. A fluorescent lamp characterized in that the distance between parts is 5 mm or less. 2. In the fluorescent lamp, the inner tube inner diameter Φ (mm) and the outer tube height H (mm) are 10≦Φ≦19 and (Φ+26)/
2. The fluorescent lamp according to item 1, which satisfies the following relationship: 0.6≦H≦(Φ+27.5)/0.54.