CN1253375A - Non-electrode MF fluorescent lamp - Google Patents

Abstract

A non-electrode MF fluorescent lamp is a discharge-luminous one under the action of both magnetic and electrical fields,and is composed of ferromagnetic coupler dipped with electronic powder, discharge cavity of composite high-B glass tube, low-pressure Hg-A gas in the discharge cavity and lamp holder. The rare-earth fluorescent powder is coated on the inner surface of outer tube of composite tube. In the initial stage of starting up the lamp, the free electrons in electronic powder of coupler are escaped out under the action of magnetic field and then accelerated along the path of discharge cavity by electrical field, to excite the Hg atoms to discharge by ionization. The ions generated by ionic discharge further bombard the electronic powder to generate more electrons, forming an avalenche procedure. The discharge voltage is suddenly dropped to a certain value to hold stable discharge. The 253.7 nm ultraviolet ray generated by discharge radiate the coated layer of outer tube to emit visual light.

Description

The intermediate frequency electrodeless florescent lamp

The present invention relates to a kind of discharge mechanism of novel florescent lamp and the frame mode that adapts with it.

At present, known conventional fluorescent lamps discharge is to be based upon on the theoretical foundation of heat filament generation thermionic emission, thereby on filament and the filament life-span of electronics powder directly influence useful life of fluorescent lamp, in addition, the excessive energy consumption of common inductance type ballast, the stroboscopic of fluorescent lamp 50Hz, bad startup during starter alternating current zero passage voltage and lower power factor and color rendering all are the major defects that influences conventional fluorescent lamps life-span and use.

The nineties initial stage, though the high-frequency induction discharge type electrodeless florescent lamp of being developed by PANASONIC, AM General electrical equipment, Dutch Phillippe has removed the useful life that filament has improved lamp widely, but still exist high-frequency electromagnetic to disturb, the cost height, defectives such as triple-frequency harmonics exceeds standard, and power factor is on the low side.

Reference: [1] electrodeless discharge lamp and progress thereof, electronic vacuum technology, 1995.3

[1] developments of fluorescent lamp, lamp and illumination, 1997.2

[3] Genura ^TMThe architectural characteristic of the electrodeless lamp of R80, lamp and illumination 1997.2

Purpose of the present invention then is at above-listed problem, intermediate frequency electrodeless (no filament) fluorescent lamp is proposed under magnetic, electric field double action, the mechanism of low-pressure mercury gas ionization discharge, use the intermediate frequency electrodeless florescent lamp that this theory is produced, life-span can reach 60,000 hours, higher color rendering is arranged, higher power factor and production technology is simple relatively, product quality is controlled easily, substantially not having simultaneously high-frequency electromagnetic disturbs, triple-frequency harmonics can be suppressed at below 25%, and the cost of lamp and price all can adapt to the level of consumption of Chinese market.

The intermediate frequency electrodeless fluorescent modulated structure of realization the object of the invention is seen Figure of description.

Fig. 1 intermediate frequency electrodeless florescent lamp outline drawing

Fig. 2 removes the structure chart of the intermediate frequency electrodeless florescent lamp of metallic lamp holder

Fig. 3 inner glass tube figure Fig. 4 outer glass tube figure

Fig. 5 intercoupler figure Fig. 6 external coupler figure

Among the figure 1, outer glass tube; 2, inner glass tube; 3, intercoupler; 4, external coupler; 5, metallic lamp holder.

Among Fig. 2, interior outer glass tube adopts high boron glass, intercoupler (3) inner glass tube (2) of packing into, external coupler (4) is enclosed within outside the inner glass tube (2), and then puts outer glass tube (1), and the discharge cavity that inner/outer glass tube forms is to isolate mutually at the coupler end, and be communicated with the complete discharge cavity of formation with outer glass tube at other end inner glass tube opening, discharge cavity vacuumizes the back applying argon gas and annotates mercury, coupler dip-coating or electrophoretic electronic powder, and the outer glass tube inwall is coated with the trichromatic rare-earth powder.

The discharge that realizes purpose of the present invention causes the ray machine reason: the initial special electronic ballast of switching on produces the coupler that the 1-2MHz high-frequency current is fed to the intermediate frequency electrodeless florescent lamp, the electromagnetic field of high frequency that produces on coupler makes the discharge of low-pressure mercury argon gas volume ionization, electron ion is under effect of electric field, obtain kinetic energy and bombard coupler by discharge cavity, make it temperature rise and the electronics of going towards out further excites mercury atoms, this process snowslide is carried out, fluorescent tube discharge cavity voltage is reduced to certain value at the utmost point in the short time, the electric ballast frequency is reduced to 50KHz left and right sides intermediate frequency by 1.5MHz left and right sides high frequency, at this moment, low-pressure mercury argon gas body is by the discharge of electromagnetic induction discharge changing into electric field polarization, because the voltage drop of discharge tube chamber is low, the also corresponding reduction of electron ion kinetic energy, the no longer temperature rise of coupler temperature dynamic balance is about the about 700K of coupler temperature this moment.Therefore, coupler adopts the ferromagnetic metal material to meet the demands fully.Triphosphor Fluorescent Powder is transformed into visible light on the low-pressure mercury argon gas body discharge generation 253.7nm ultraviolet radiation outer tube wall.

Discharge cavity adopts composite pipe structure may reach following purpose.

A, under the prerequisite that guarantees the lamp light-emitting area, prolong discharge cavity effective length, dwindle the discharge cavity diameter, increase the collision probability of electron ion and mercury atom, raising mercury atoms discharging efficiency.

B, discharge cavity discharge path turnover, effectively reduced the quantity of kinetic energy ion, reduced the sputter and the short ultraviolet generation of 185mm of electronics powder.

C, the outer length size that has shortened lamp and the distance of inside and outside coupler.The minimizing of inside and outside coupler distance, the quantity that the free electron in the electronics powder is gone towards out under electromagnetic field effect increases.

Claims (3)

1, the discharge of intermediate frequency electrodeless fluorescent causes light and basic structure, it is characterized in that: the high-frequency induction discharge of lamp starting period accounts for leading role, and the steady operation phase, the discharge of intermediate frequency electric field polarization accounts for leading role.

2, according to the described basic structure of claim 1: discharge cavity is composited by inside and outside high boron glass-tube, it is characterized in that: the multiple tube discharge cavity is isolated mutually in that coupler one end is housed, the other end is communicated with, and vacuumizes the back in the chamber and injects low-pressure mercury argon gas body, and outer tube wall is coated with fluorescent RE powder.

3, according to the described basic structure of claim 1: coupler material adopts iron-nickel alloy or other refractory metal, dip-coating electronics powder.Intercoupler helical form or netted, external coupler are made and are slightly larger than the circular of inner glass tube diameter.

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