US2843804A - Device for supplying lighting panels - Google Patents

Device for supplying lighting panels Download PDF

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Publication number
US2843804A
US2843804A US407079A US40707954A US2843804A US 2843804 A US2843804 A US 2843804A US 407079 A US407079 A US 407079A US 40707954 A US40707954 A US 40707954A US 2843804 A US2843804 A US 2843804A
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United States
Prior art keywords
voltage
capacitor
inductance
lighting panel
cathode
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Expired - Lifetime
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US407079A
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English (en)
Inventor
Diemer Gesinus
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US Philips Corp
North American Philips Co Inc
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US Philips Corp
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Publication date
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Publication of US2843804A publication Critical patent/US2843804A/en
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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B44/00—Circuit arrangements for operating electroluminescent light sources

Definitions

  • the present invention relates to an electro-luminescent lighting panel device.
  • luminescent substances such as, for example, Zinc sulphide, cadmium sulphide, and mixed crystals thereof, emit visible rays under the action of a variable electric field.
  • lighting panels which consist of two plane electrodes made of electrically conductive material and having a thin layer of such an electroluminescent substance interposed between them as dielectric. At least one of the electrodes is transparent. On the side of this electrode the panel emits light, if an alternating voltage of sufficient intensity, for example, of some hundreds of volts, is set up between the electrodes.
  • An electro-luminescence which is useful in practice is generally produced only if the frequency is comparatively high, for example, of the order of some thousands of cycles per second. Consequently, direct connection to the electric power supply is usually not possible, so that a device is included which raises the power supply frequency.
  • This may be a frequency multiplier or oscillator comprising one or more amplifier tubes which are supplied with rectified supply voltage, if the power supply is an A. C. supplyv p
  • Such devices are complicated and have a low efficiency.
  • the present invention provides a device for supplying a lighting panel which with high efficiency transforms the power supply voltage into alternating voltage at optimum frequency and voltage. It can be used not only with an alternating voltage supply, but also with a direct voltage supply.
  • an oscillator is provided with feedback and its frequency is substantially determined by a capacity and a resistance.
  • an alternating voltage having steeply rising wave edges is produced which is very advantageous for supplying the lighting panel.
  • the oscillator it is possible for the oscillator to be supplied from the alternating voltage power supply directly, that is without interposition of a rectifier. It has been found that the fact that in this event the oscillations are interrupted periodically raises no difficulty in providing a device which is advantageous in practice.
  • inductive feedback is used, an inductance being connected in three-point connection to the anode, the control-grid and the cathode of a controlled discharge tube.
  • the control-grid of the tube is connected through a capacity to one end of the inductance and through a resistance to the cathode.
  • the dimensions of the different elements are such that the frequency set up is substantially determined by the said capacity and resistance.
  • the lighting panel may be connected in parallel with the inductance or a part thereof as a capacity.
  • the inductance In order to adapt different lighting panels to the device in optimum manner it is desirable for the inductance to be provided with a number of tapping points, in which case the cathode of the tube may be connected at will to one of said tapping points by means of a switching member.
  • the cathode may be directly heated in that it is also connected directly to the alternating current power supply in series with a capacitor of suitable capacity.
  • Fig. l is a schematic diagram of an embodiment of the device of the present invention.
  • Fig. 2 is a graphical illustration aiding in the explanation of the operation of the device of the present inventlon
  • Fig. 3 is a schematic diagram of another embodiment of the device of the present invention.
  • Fig. 4 is a schematic diagram of still another embodiment of the device of the present invention.
  • reference numeral 1 designates a lighting panel, which may be looked upon as a capacitor. It is connected in parallel with an inductance 3 which is connected in three-point connection to an anode, a controlgrid and a cathode of a triode 2 which acts as an oscillator.
  • the inductance 3 may consist of a coil comprising a core made of substantially ncn-conductive magnetic material.
  • the inductance 3 has a tapping point 4 connected to one of the power supply terminals 8 and also through a capacitor 6 to one end of the cathode, which is also the filament, of the triode.
  • the inductance 3 may have one or more additional tapping points; for example, a tapping point 4, with which a switch arm 10 may cooperate in order to adapt different lighting panels to the device in optimum manner.
  • the other end of the cathode is connected to the other one of the power supply terminals 8.
  • the power supply is supposed to be an alternating voltage supply.
  • One end of the coil 3 is connected directly to. the anode, the other end being connected through a capacitor 5 to the control-grid of the triode.
  • the control grid and the left hand end of the cathode have a resistor '7 interposed between them.
  • the cathode of the tube 2 may be indirectly heated.
  • the dimensions of the different elements a'resuch that the frequency set up is not determined by the parallel combination of the inductance and the capacity of the lighting panel, but by the capacity of the capacitor 5 and the resistor 7.
  • the capacitor 5 should be smaller than in the usual threepoint connection.
  • the elements are advantageouslydimensioned as follows:
  • the line a represents the shape of the curve of the produced supply voltage in the case of the anode being at a sufficiently high positive potential.
  • the curve [2 represents a damped oscillation the frequency of which is determined by the inductance and the capacity of the panel. This remains active during a short period of time subsequent to the passage through zero.
  • the curve c is the envelope which is substantially sinusoidal.
  • the effective value of the voltage produced may be 200 volts in the case of a supply of 220 volts, 50 cycles per second.
  • Fig. 3 shows an arrangement in which the lighting panel 1 is connected between the anode of the tube and the cathode supply conductor which is directly connected to the power supply.
  • the voltage at oscillator frequency which is active across the lighting panel is somewhat lower than in the arrangement of Fig. 1.
  • the supply voltage at 50 cycles per second is invariably set up across the panel 1.
  • the triode can be put out of circuit while the power supply voltage continues to be active across the panel with the result that this continues to luminesce with decreased intensity.
  • Fig. 4 shows a symmetrical arrangement comprisng two oscillator tubes 11 and 12 which are active alter-' nately.
  • the filaments are supplied with alternating current through two identical capacitors 15 and 16 connected in series.
  • the panel 1 is connected between the anodes.
  • the coils 13 and 14 may be wound on a common core. In this arrangement flicker can be substantially avoided.
  • the devices described have the advantage that they consist of standardized parts and occupy very little space.
  • An electro-luminescent lighting panel device comprising a lighting panel comprising an electro-luminescent material and means for energizing said luminescent material, said means comprising an oscillatory circuit for producing an oscillatory voltage having steeply rising wave edges and having an electron discharge tube and a feedback circuit connected thereto and including a capacitor and a resistor, said capacitor and said resistor having values at which the frequency of the voltage of said oscillatory circuit is substantially determined by the magnitudes of the resistance of said resistor and the capacitance of said capacitor, means for supplying an operating voltage to said oscillatory circuit, and means for applying said oscilltory voltage from the output of said oscillatory circuit to said lighting panel.
  • said oscillatory circuit includes an inductance connected across said lighting panel, and wherein said electron discharge tube includes an anode, a cathode and a control-grid, said inductance being connected at a first point to said anode, at a second point to said control grid through said capacitor, and at a third point to said cathode, said resistor being connected between said control-grid and said cathode.
  • said inductance includes a plurality of tappings and further including a switch member for selectively connecting one of said plurality of tappings to said cathode.
  • An electro-luminescent lighting panel device comprising a lighting panel comprising an electro-luminescent material and means for energizing said luminescent material, said means comprising an oscillatory circuit for producing an oscillatory voltage having steeply rising wave edges and having an electron discharge tube including a directly heated cathode and a feeback circuit including a capacitor and a resistor, said resistor and capacitor having values at which the frequency of the voltage of said oscillatory circuit is substantially determined by thet magnitudes of the resistance of said resistor and the capacity of said capacitor, a second capacitor, means for applying an alternating voltage to said directly heated cathode through said second capacitor, and means for applying said oscillatory voltage from the output of said oscillatory circuit to said lighting panel.
  • An electro-luminescent lighting panel device comprising a lighting panel comprising an electroluminescent material and means for energizing said luminescent material, said means comprising first and second oscillatory circuits for producing an oscillatory voltage having steeply rising wave edges, each of said circuits having an electron discharge tube and a feedback circuit including a capacitor and a resistor, said capacitor and said resistor having values at which the frequency of the voltge of said oscillatory circuit is substantially determined by the magnitudes of the resistance of said resistor and the capacitance of said capacitor, means for supplying an operating voltage to each of said'oscillatory circuits, and means for applying the oscillatory voltage from the output of each of said oscillatory circuits to said lighting panel.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optics & Photonics (AREA)
  • Electroluminescent Light Sources (AREA)
  • Circuit Arrangements For Discharge Lamps (AREA)
  • Circuit Arrangement For Electric Light Sources In General (AREA)
US407079A 1953-02-03 1954-01-29 Device for supplying lighting panels Expired - Lifetime US2843804A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
NL1046775X 1953-02-03
NL322798X 1953-02-03
NL2843804X 1953-02-03
JP172454A JPS31820B1 (it) 1953-02-03 1954-01-30

Publications (1)

Publication Number Publication Date
US2843804A true US2843804A (en) 1958-07-15

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ID=54337587

Family Applications (1)

Application Number Title Priority Date Filing Date
US407079A Expired - Lifetime US2843804A (en) 1953-02-03 1954-01-29 Device for supplying lighting panels

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US (1) US2843804A (it)
JP (1) JPS31820B1 (it)
CH (1) CH322798A (it)
DE (1) DE1046775B (it)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3047762A (en) * 1960-09-27 1962-07-31 North American Aviation Inc Electroluminescence
US3066242A (en) * 1960-02-03 1962-11-27 Gen Dynamics Corp Electroluminescent display panel

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1171081B (de) * 1962-08-07 1964-05-27 Siemens Ag Anordnung zur Steuerung der Helligkeit von Elektrolumineszenzplatten

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121829A (en) * 1935-10-05 1938-06-28 Seaman Advertising sign
US2142633A (en) * 1937-10-04 1939-01-03 Le Roy H Dey Sign
US2291467A (en) * 1941-01-21 1942-07-28 Floray Corp Luminescent sign
US2347715A (en) * 1940-07-27 1944-05-02 Raytheon Mfg Co Arc starting device
US2488169A (en) * 1946-02-20 1949-11-15 Benjamin B Schneider Neon-type sign
US2566345A (en) * 1946-11-18 1951-09-04 Lyon George Albert Wheel cover
US2694785A (en) * 1952-10-24 1954-11-16 Gen Electric Electroluminescent oscillator

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2075200A (en) * 1935-06-17 1937-03-30 Ibuka Masaru Means for lighting gas discharge tubes
AT149935B (de) * 1935-08-20 1937-06-10 Joseph Fodor Anordnung zur Speisung von elektrischen Leuchtröhren mittels Hochfrequenzstromes.
DE705156C (de) * 1937-09-23 1941-04-18 Octave Caudron Anordnung zum Betriebe elektrodenloser Leuchtroehren
FR836418A (fr) * 1937-09-28 1939-01-18 Stella Lux Procédé d'alimentation des appareils utilisant l'excitation électrique de la luminescence et ses moyens de mise en oeuvre
FR995307A (fr) * 1949-09-15 1951-11-30 Procédé et installation pour l'alimentation de tubes luminescents et autres tubes à décharge

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2121829A (en) * 1935-10-05 1938-06-28 Seaman Advertising sign
US2142633A (en) * 1937-10-04 1939-01-03 Le Roy H Dey Sign
US2347715A (en) * 1940-07-27 1944-05-02 Raytheon Mfg Co Arc starting device
US2291467A (en) * 1941-01-21 1942-07-28 Floray Corp Luminescent sign
US2488169A (en) * 1946-02-20 1949-11-15 Benjamin B Schneider Neon-type sign
US2566345A (en) * 1946-11-18 1951-09-04 Lyon George Albert Wheel cover
US2694785A (en) * 1952-10-24 1954-11-16 Gen Electric Electroluminescent oscillator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3066242A (en) * 1960-02-03 1962-11-27 Gen Dynamics Corp Electroluminescent display panel
US3047762A (en) * 1960-09-27 1962-07-31 North American Aviation Inc Electroluminescence

Also Published As

Publication number Publication date
CH322798A (de) 1957-06-30
JPS31820B1 (it) 1956-02-10
DE1046775B (de) 1958-12-18

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