CN2306568Y - Small power fluorescent tube - Google Patents

Abstract

The utility model relates to a small power fluorescent lamp tube which adopts an oxide thin film cold cathode structure and effectively overcomes the problem that a cold cathode lamp tube is badly blackened early. Simultaneously, the inner part of a tube shell is provided with an auxiliary electrode or an inner induction starting line as a starting component, which leads starting voltage to be greatly reduced, and leads the utility model to be quickly started in voltage of 160V. The utility model also has the advantages of stable operation, high power factor, simple structure, low cost, etc. The service life of the utility model can reach 8000 hours.

Description

The small-power fluorescent tube

The utility model relates to a kind of microminiature small-power fluorescent tube that is applicable to making illuminator at night or indicator light.

In the past night illuminator or indicator light generally adopt incandescent lamp bulb, its power is generally about 10W because the filament manufacturing of the following incandescent lamp of 7W very the difficulty.And usually to night illuminator or indicator light brightness requirement not high, particularly in the bedroom, use, brightness is too high, not only influence sleep, and waste electric energy.In recent years, had the following small-power fluorescent lamp of 3W, it utilizes the capacitor current limliting, and good electricity-saving effect is arranged, but the tube cathode of this lamp is a hot cathode, and its power factor is not high, and the cost of lamp is also higher.General cathode fluorescent tube cathodic sputtering is bigger, and the early stage blackout in cathodic region is more serious, and the general volume of this fluorescent tube is bigger, if make the compact low power fluorescent tube, the ratio that its blackout district accounts for light-emitting area will be very high, have a strong impact on the useful life of fluorescent tube from face, make it lose practical value.

The purpose of this utility model provides the fluorescent tube of a kind of microminiature low-power (2W following), and it is the power factor height not only, and start fast, working stability, useful life be long.

Fluorescent tube of the present utility model comprises shell, negative electrode and activation member.Negative electrode is the sull cold cathode, and the distance between two negative electrodes is 11～36mm.Cathode fluorescent tube according to this configuration, its activation member can have two kinds of forms: a kind of is that activation member is an auxiliary electrode, is arranged at respectively near two negative electrodes, and the distance of auxiliary electrode and negative electrode is 0.7～3mm; Another kind is that activation member is that internal induction starts line, it is that one section appearance is with the lead (good conductor) of insulating barrier or the resistive element of 10～20K Ω, the lead-out wire of fluorescent tube two negative electrodes is positioned at the same end of fluorescent tube (this end is called exit), and internal induction starts line and connects negative electrode and the lead-out wire thereof that is positioned at the other end relative with exit as line.

Fluorescent tube of the present utility model can be made straight tube shape or U-shaped that lead-out wire lays respectively at two ends when adopting auxiliary electrode to make activation member; When adopting internal induction startup line to make activation member, then generally make the straight tube shape that lead-out wire is positioned at same end.

When fluorescent tube of the present utility model is made light fixture, can directly carry out ballast by pure resistor.

Adopt the fluorescent tube of auxiliary electrode as activation member, draw the auxiliary electrode of receiving the fluorescent tube other end by a resistance respectively at the lead-out wire of two negative electrodes, arbitrary therein then negative electrode is connected in series a resistance and connects civil power again, and another negative electrode directly connects civil power.After the energized, by the effect of current-limiting resistance, at first glow discharge between negative electrode and auxiliary electrode excites gas conducting in the fluorescent tube, lights fluorescent tube.

Adopt internal induction to start the fluorescent tube that line is made activation member, when internal induction startup line is lead, only need connect civil power again by serial connection one resistance on a cathode terminal, another cathode terminal directly connects civil power.When internal induction startup line was resistive element, two cathode terminals can directly connect civil power, and do not need series resistor again.After the energized,, the fluorescent tube starting resistor is declined to a great extent to the 160V because internal induction starts the induced potential of line.

Fluorescent tube of the present utility model has solved the early stage blackout problem of cold cathode fluorescent lamp preferably owing to adopt the cold cathode of sull structure, and the useful life of fluorescent tube is prolonged more than the several times, reaches 8000 hours.Simultaneously, owing to adopt cold cathode structure, the power factor of its light fixture of making is improved largely than hot cathode lamp pipe, reach and approach COS φ=1, and reduced system lamp cost, in addition, owing in fluorescent tube, be provided with activation member, starting resistor is significantly reduced, guarantee that fluorescent tube can start fast under lower line voltage, and steady operation.

When fluorescent tube of the present utility model was 1W or 2W when its power, concrete parameter was: rated voltage 220V, operating voltage 175V, starting resistor 160V, operating current 4.5mA/1W, 8mA/2W, light efficiency 11Lm/W, 8000 hours life-spans.

The utility model fluorescent tube is specially adapted to make illuminator or indicator light at night.

The utility model is described in further detail below in conjunction with accompanying drawing.

Fig. 1 adopts the lamp tube structure schematic diagram of auxiliary electrode as activation member.

Fig. 2 is the circuit theory diagrams that the fluorescent tube of Fig. 1 is made light fixture.

Fig. 3 adopts internal induction to start the lamp tube structure schematic diagram of line as activation member.

Fig. 4 is the circuit theory diagrams that the fluorescent tube of Fig. 3 is made light fixture.

Among Fig. 1,1 is the fluorescent tube shell, and 2 is the sull cold cathode, and 3 is auxiliary electrode.The distance of two negative electrodes is 11～36mm, and the distance that auxiliary electrode 3 and negative electrode are 2 is 0.7～3mm.

Among Fig. 2, two negative electrodes 2 of fluorescent tube draw on the auxiliary electrode 3 of receiving the other end by resistance R 2 and R3 respectively, connect civil power behind one of them negative electrode series resistor R1, and another negative electrode directly connects civil power.

Among Fig. 3,1 is the fluorescent tube shell, and 2 is the sull cold cathode, and 4 are internal induction startup line.Distance between two negative electrodes is 11～36mm, and the lead-out wire of two negative electrodes is positioned at the same end of fluorescent tube (exit), and internal induction starts negative electrode and the lead-out wire thereof that line 4 connects the other end relative with exit.It is good conductor or 10～20K Ω resistive element that internal induction starts line, and its surface makes the interior gas-insulated of itself and fluorescent tube, and do not produce gas discharge between the negative electrode of exit with insulating barrier and fluorescent material.

Among Fig. 4, internal induction line 4 is good conductor (lead), and serial connection one resistance R 1 connects civil power again on the cathode terminal that it connected, and another cathode terminal directly connects civil power.

Claims (3)

1, a kind of small-power fluorescent tube is characterized in that comprising shell, negative electrode and activation member, and negative electrode is the sull cold cathode, and the distance between two negative electrodes is 11～36mm.

2, according to the described fluorescent tube of claim 1, it is characterized in that activation member is an auxiliary electrode, be arranged at respectively near two negative electrodes, with negative electrode at a distance of 0.7～3mm.

3, according to the described fluorescent tube of claim 1, feature is that activation member is that internal induction starts line altogether, it is that one section appearance is with the lead of insulating barrier or the resistive element of 10～20K Ω, the lead-out wire of two negative electrodes is positioned at the same end of fluorescent tube, and internal induction starts line and connects negative electrode and the lead-out wire thereof that is positioned at the other end relative with exit as line.

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