High lumen output cold cathode fluorescent lamp
AssigneeTBT Asset Management International Limited
InventorShichao Ge
Life of this patent
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Abstract
In one embodiment, when the current density at the cathode is less than 0.2 mA/mm2, cathode sputtering is avoided or reduced to such an extent that the life time of the CCFL is not significantly adversely affected. In another embodiment, the internal diameter (ID) of the CCFL tube is within the range of 3 to 16 mm. Preferably, the distance between the anode and cathode is within a range of about 200˜1000 times of the internal diameter of the CCFL tube, and the distances between at least one section of the CCFL tube and two adjacent sections of the CCFL tube is less than about 5 times an outside diameter of the CCFL tube. Preferably, the efficiency of the CCFL is not less than about 55 lm/W.
Claims26
A high lumen output cold cathode fluorescent lamp (CCFL) device, comprising:
- at least one CCFL tube containing two electrodes:
- an anode and a cathode;
- a supporting structure attached to the cold cathode fluorescent lamp tube;
- at least one driver having an input and an output;
- a driver housing containing said at least one driver;
- and
- an electrical connector;
- wherein an input of the driver is connected to a power source through the electrical connector, and the output of the driver is connected to the electrodes of the cold cathode fluorescent lamp tube;
- wherein said supporting structure, said driver housing, said at least one CCFL tube and said electrical connector are connected to form a unitary lamp with the following characteristics:
- said at least one CCFL tube having an inside diameter of 3˜16 mm;
- the length between the anode and cathode being about 200˜1000 times of the inside diameter of the at least one CCFL tube;
- the electron emission area of the cathode being in a range of about 100˜2,000 mm2;
- and the ratio of electrode current to the electron emission area of the cathode being in a range of about 0.01˜0.2 mA/mm2.
A high lumen output cold cathode fluorescent lamp (CCFL) device, comprising:
- at least one CCFL tube containing two electrodes:
- an anode and a cathode;
- a supporting structure attached to the cold cathode fluorescent lamp tube;
- at least one driver having an input and an output;
- a driver housing containing said at least one driver;
- and
- an electrical connector;
- wherein an input of the driver is connected to a power source through the electrical connector, and the output of the driver is connected to the electrodes of the cold cathode fluorescent lamp tube;
- wherein said supporting structure, said driver housing, said at least one CCFL tube and said electrical connector are connected to form a unitary lamp with the following characteristics:
- said at least one CCFL tube having an inside diameter of 3˜16 mm;
- said CCFL device having an efficiency in converting power from the power source to light output of not less than about 55 lumen/W.
A high lumen output cold cathode fluorescent lamp (CCFL) device, comprising:
- at least one CCFL tube containing two electrodes:
- an anode and a cathode;
- a supporting structure attached to the cold cathode fluorescent lamp tube;
- at least one driver having an input and an output;
- a driver housing containing said at least one driver;
- and
- an electrical connector;
- wherein an input of the driver is connected to a power source through the electrical connector, and the output of the driver is connected to the electrodes of the cold cathode fluorescent lamp tube;
- wherein said supporting structure, said driver housing, said at least one CCFL tube and said electrical connector are connected to form a unitary lamp with the following characteristics:
- the ratio of electrode current and cathode emission area being in a range of about 0.01˜0.2 mA/mm2;
- said CCFL device having an efficiency in converting power from the power source to light output of not less than about 55 lumen/W.
Dependencies are inferred from the claim text.