JPS6364028B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to low current fluorescent lamp electrodes. As the auxiliary anode 24 in the fluorescent lamp electrode of a conventional low current type fluorescent lamp, especially a rapid start type fluorescent lamp, a ring-shaped non-connected type that is not connected to the filament 23 as shown in Fig. 1 is used. It facilitates local discharge between the filament terminals and prevents blackening of the fluorescent lamp tube due to scattering of emitter substances (thermion-emitting substances such as BaO, SrO, CaO, etc.), but the anode cycle Since there is no shunting effect of the tube current, the main electrode is susceptible to strong electron impact, which causes consumption of the emitter material, resulting in blackening and shortened lifespan. The present invention has been made in view of the above, and includes:
Fluorescent lamps that can effectively prevent scattering and consumption of emitter substances, prevent blackening of the fluorescent lamp tube, maintain long lifespan, shorten startup lamp lighting time, and start with low voltage and reduce loss. The purpose is to provide an electrode. The present invention will be explained in detail below with reference to Examples. FIG. 2 shows an embodiment of the electrode of the present invention, where 7 is a stem, and 1 and 2 are internal lead-in wires electrically connected to external terminal pins and introduced into the fluorescent lamp tube. Reference numeral 3 denotes a filament, which is connected and installed between the upper parts of the internal lead-in wires 1 and 2. A pair of auxiliary anodes 4 and 5 are made of Ni plate or
It is formed into a dome shape by bending an Fe plate or the like into a substantially C-shaped cross section with an opening 11 at the bottom, and each auxiliary anode 4, 5 is connected to the support wires 8, 9 through the internal lead-in wires 1, 2. The connection is fixed. Therefore, the auxiliary anodes 4 and 5 are electrically connected to the internal lead-in lines 1 and 2 via the support lines 8 and 9.
A pair of auxiliary anodes 4 and 5 are opposed to each other with a small gap 6 interposed therebetween, and furthermore, both auxiliary anodes 4 and 5 are placed over the outer periphery of the filament 3 with a gap therebetween to cover the filament 3. The auxiliary anodes 4 and 5 are disposed on the outer periphery of the filament 3, which is a pair of opposing filaments 3 provided at both ends of the fluorescent lamp tube, so that the opening 11 faces the opposite side of the opposing filament 3. Here, the size of the minute gap 6 is preferably 2 mm or less; if it is wider than this, it becomes difficult for discharge to occur between the auxiliary electrode plates 4 and 5. The dimension of the gap 10 between the inner peripheral surface of the auxiliary anodes 4 and 5 and the outer peripheral surface of the filament 3 is preferably 1 to 2 times the coil diameter of the filament 3, particularly around 3 mm. If it is wider than this, the effect of preventing heat loss, which will be described later, will be small, and it will also be structurally inconvenient. Here, the reason why the gap 10 between the inner circumferential surfaces of the auxiliary anodes 4 and 5 and the outer circumferential surface of the filament 3 is set to approximately 3 mm will be explained. Figure 4 shows the spark voltage between parallel plate electrodes, that is, Patsien's law.
The horizontal axis shows the gap length x atmospheric pressure (p.d), and the vertical axis shows the spark voltage. In other words, this is based on Patsien's law during gas discharge, and Figure 4 shows an example of air.
Argon is a common gas sealed in fluorescent lamps.
Then, as shown in Tables 3 and 2 of Part 95 of "Ionized Gas Ring" (University Lectures of the Institute of Electrical Engineers of Japan (edited by the Institute of Electrical Engineers of Japan)), which shows the relationship between the minimum spark voltage and the p・d product that gives it, There is. When the p・d product is 7.6 (mm・mmH ⁺⁾ , the spark voltage obtains the minimum value of 233 (V). Therefore,
If the gas in the fluorescent lamp is argon, then p・d=7.6 (mm・mmHg), and the gas (argon) pressure is 3mm・mmHg.
Then, d2.5mm. At this time, the spark voltage is at its minimum. In this way, by not making the gap 10 between the auxiliary anodes 4, 5 and the filament 3 larger than 3 mm, the spark voltage can be kept low and it is possible to start at a low voltage. According to Patsien's law, if the spark voltage is lower than the minimum value of the p.d product, the value of the spark voltage will increase, so it is preferable to set it lower than the above value, that is, 2.5 mm. Therefore, in the electrode of the present invention, the stem 7
A filament 3 is attached between a pair of internal lead-in wires 1 and 2 supported by Since the outer periphery of the filament 3 is surrounded by the auxiliary anodes 4 and 5 through an opening, and each of the auxiliary anodes 4 and 5 is connected and fixed to the pair of internal lead-in wires 1 and 2, the inner lead-in wires are A voltage is applied to the auxiliary anodes 4 and 5 fixedly connected to the auxiliary anodes 1 and 2 at the time of startup, and a local discharge occurs in the small gap 6 between the auxiliary anodes 4 and 5, making it easier to transition to an arc than in a normal lamp. This shortens the time it takes to turn on the light. Also, since the auxiliary anodes 4 and 5 are connected to the internal lead-in wires 1 and 2 in this way, part of the tube current is shunted during the anode cycle, and the electron impact on the main electrode (filament 3 in this case) is alleviated. , which is useful for reducing emitter material consumption, and by reducing emitter material consumption, it is possible to reduce blackening of the fluorescent lamp tube.
Furthermore, by attaching the auxiliary anodes 4 and 5 in a manner that wraps around the filament 3, it is possible to reduce heat dissipation loss from the filament 3, and also to prevent scattering of emitter substances, thereby preventing blackening of the fluorescent lamp tube. It is. Furthermore, by setting the gap 10 between the filament 3 and the auxiliary anodes 4 and 5 to approximately 3 mm, based on Patsien's law during gas discharge, for example, from the relationship between the body and gas pressure in a fluorescent lamp, Gap 1 between auxiliary anodes 4, 5 and filament 3
By setting 0 to a predetermined value, that is, approximately 3 mm, the spark voltage can be kept low and the fluorescent lamp can be started with a low voltage. Next, the effects of the present invention will be specifically shown. A 40WFL lamp was tested using a 40WFL double coil and an electrode with the following structure. Auxiliary anode material: 0.1mm thick, stable against Hg
Ni plate Small gap: 1 mm Gap between filament and auxiliary anode: 3 mm Performance tests were conducted on the electrode according to the present invention and a commercially available 40WFL lamp, and the results are shown in the table below.

[Table] "Life span" is expressed as the number of short-term repeated flashes until the light stops flashing or does not light up, with one cycle being 5 seconds on and 5 seconds off. "Lighting time" is expressed as the time from switch ON to full lighting when starting lighting with a glow bulb (average of 4100 times). The "degree of blackening" is expressed as a value after 100,000 flashes.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a conventional example, Fig. 2 is a perspective view of an embodiment of the present invention, Fig. 3 is a partially omitted enlarged perspective view of the same, and Fig. 4 is a diagram showing Patsien's law of the same. . 1 and 2 are internal lead-in wires, 3 is a filament, 4,
5 is an auxiliary anode, 6 is a minute gap, and 7 is a stem.

Claims (1)

[Claims] 1. A filament is installed between a pair of internal lead-in wires supported by a stem, and a pair of approximately C-shaped auxiliary anodes opening on the stem side are opposed to each other via a minute gap with a maximum of 2 mm, and each auxiliary anode is The outer periphery of the filament is surrounded by a gap, the gap between the filament and the auxiliary anode is set to approximately 3 mm, and each auxiliary anode is connected and fixed to a pair of internal lead-in wires. Fluorescent lamp electrode.