JPS6185763A - Bulb type fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain a high efficiency lamp through voltage increase up to a lamp voltage which cannot ignite in a choke type stabilizer by presetting the composition of gas sealed within a lamp which given optimum efficiency to a high frequency ignition circuit. CONSTITUTION:A lamp is composed of a luminous internal bulb 1, an external bulb 2 and an electrode 3 and is excited by a high frequency ignition circuit device. This lamp is filled with the Ar gas 100% and a mixed gas changing a mixing ratio of neon up to a gas pressure of 2.5Torr. In this case, the sealing pressure P (Torr) of mixed gas is in the range of 1.5<=P<=6, a mixing ratio of neon (A%) is in the range of 10<=A<=50, and excitation frequency of lamp is set to 10KHz or more.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the luminous efficiency of a high-frequency lighting system for a self-ballasted fluorescent lamp used as a replacement for a light bulb, and particularly to a lamp suitable for increasing the luminous efficiency of the system.

[Background of the invention]

It has been disclosed that a curved tube fluorescent lamp device equipped with a conventional high-frequency lighting device is useful for improving overall efficiency in terms of bulb length, tube diameter, and lamp current, as described in JP-A-58-135564. has been done. However, no consideration was given to the composition of the filled gas.

[Purpose of the invention]

An object of the present invention is to further improve system efficiency by optimizing the filler gas composition and to provide a highly efficient self-ballasted fluorescent lamp.

[Summary of the invention]

In general, in fluorescent lamps, by increasing the length of the pulp tube, the positive column becomes longer and loss due to electrode drop is reduced. Therefore, an attempt is made to increase the light output, but when starting with a choke ballast, the starting circuit will restart if the lamp voltage is not kept below a certain value, so measures such as increasing the diameter of the tube are taken. As mentioned above, this type of fluorescent lamp using a choke-type ballast has limitations on tube length and is aimed at miniaturization, so it is difficult to improve the overall efficiency due to limitations on tube diameter. By doing so, the pulp tube length is increased and the lamp voltage is increased to a range where it is impossible to start with a choke type ballast, thereby improving efficiency. In addition, the high-frequency lighting circuit increases the lamp voltage as much as possible and throttles the lamp current.

Circuit efficiency has been improved by reducing parastross. However, since the optimal lamp voltage during high-frequency lighting is usually about 10 to 200 times lower than when lighting with a choke-type ballast, improving efficiency is not easy.Therefore, we investigated the composition of the filled gas in order to further increase the lamp voltage. . The method of increasing lamp voltage by changing the composition of the filled gas is as follows:
Keep the average molecular weight of the filled gas small. In other words, by mixing an inert gas with a small atomic weight with argon gas, the lamp current is reduced and the lamp voltage is increased. However, if the conversion efficiency to optical output is not sufficiently considered due to the use of a mixed gas, it is conceivable that the improvement in circuit efficiency and the decrease in conversion efficiency will offset each other. Accordingly, the present invention attempts to achieve the above object by evaluating the overall efficiency of the system and setting the gas composition of the lamp that provides an appropriate efficiency for the high-frequency lighting circuit.

[Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be described with reference to figures including FIGS. 1 to 5. The structure of a separate inner tube fluorescent lamp is shown in Fig. 1.The lamp has an inner tube diameter of 12φ and a discharge length of 310 mm. Outer tube valve 2. It is composed of electrodes 3 and is driven by a high frequency lighting circuit device shown in FIG. 1st
A gas pressure of 2,5 To
Figure 3 shows the efficiency and lamp voltage measured using a choke-type ballast while keeping the lamp power constant for a lamp filled with RR.From these results, the lamp voltage increases as the neon mixing ratio increases. On the other hand, it can be seen that the optical output is decreasing.

Next, the above-mentioned lamp was combined with a high-frequency lighting device and the overall efficiency of the system was compared.The results are shown in Figure 4.The point with the highest overall efficiency is N.

The neon mixture ratio (A%), which was found to be 10≦A≦50, was found to be 10≦A≦50, which clearly shows a significant difference compared to an argon-filled lamp, taking into account the various lamp manufacturing variations.A<10. When 50<A, there is no difference with argon filling, or on the contrary, the efficiency decreases.The relationship between the 0th order filled gas pressure and efficiency is about the results when using a mixed gas of 30% neon and 70% argon. The maximum luminous flux value when using the above mixed gas shown in FIG. 5 is obtained around 2.9 Torr. As the neon mixing ratio increases, the pressure of the filled gas that provides the maximum luminous flux shifts to the high pressure side. If the filled gas pressure is less than 1.5 Torr, the electrode will be severely damaged and it will be difficult to ensure its life. Furthermore, if the pressure exceeds 6 Torr, the optical output will drop significantly.

〔Effect of the invention〕

As described above, with the present invention, it is possible to increase the lamp voltage to a level that cannot be lit with a choke-type ballast by using high-frequency lighting, and further, by optimizing the neon-argon mixing ratio, it is possible to increase the overall efficiency, which is effective in improving efficiency. There is.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a separate inner tube type fluorescent lamp according to the present invention;
Figure 2 is a block diagram of the high frequency lighting circuit, Figure 3 is a diagram of the relationship between neon-argon mixing ratio, light output, and tube voltage, Figure 4 is a diagram of the relationship between argon-neon mixture ratio and overall efficiency, and Figure 5 is a diagram of the relationship between argon-neon mixture ratio and overall efficiency. FIG. 3 is a diagram showing the relationship between filler gas pressure and relative luminous flux.

Claims (1)

[Claims] 1. In a lamp consisting of an arc tube having at least a partially bent part and a mixed gas of argon and neon sealed therein, the pressure P (Torr) of filling the mixed gas is 1.5≦P≦6.
A compact fluorescent lamp characterized in that the mixing ratio (A%) of neon is 10≦A≦50 in the range of 10≦A≦50, and the lamp is driven at a frequency of 10 KHz or more.