Energy efficient lamp
AssigneeYehi-Or Light Creation Ltd.
InventorAvraham Emanuel
Life of this patent
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Abstract
A lighting tube provides a path from the anode to the cathode in which the kinetic energy of the electrons is maintained substantially within the range of the excitation energies of visible photons, and in particular the excitation energies of yellow light. Magnets are arranged to provide a magnetic field that is substantially perpendicular to the electric field between anode and cathode. The orthogonal electrical and magnetic fields along the path are provided with values that accelerate the electrons but limit the maximum kinetic energy. Low pressure gas may be provided in the tube.
Claims34
A lighting tube having a first end and a second end, defining a longitudinal length therebetween, and comprising:
- a field anode and a field cathode arranged lengthwise along said tube to provide an electric field;
- magnets arranged lengthwise along said tube to provide a magnetic field, said magnets being arranged such that said magnetic field is substantially perpendicular to said electric field;
- said electric and magnetic fields together providing an electron path lengthwise along said tube, and wherein at least one of said field anode and said field cathode comprises a smooth coating on the tube surface.
A lighting tube having a first end and a second end, defining a longitudinal length therebetween, and comprising:
- a field anode and a field cathode arranged lengthwise along said tube to provide an electric field;
- magnets arranged lengthwise along said tube to provide a magnetic field, said magnets being arranged such that said magnetic field is substantially perpendicular to said electric field;
- an electron gun comprising an emission cathode, and an electron acceleration grid positioned to accelerate electrons from said electron gun into an electron path lengthwise along said tube, the path defined by said electric and magnetic fields together.
A lighting tube having a first end and a second end, defining a longitudinal length therebetween, and comprising:
- a field anode and a field cathode arranged lengthwise along said tube to provide an electric field;
- magnets arranged lengthwise along said tube to provide a magnetic field, said magnets being arranged such that said magnetic field is substantially perpendicular to said electric field;
- said electric and magnetic fields together providing an electron path lengthwise along said tube, and wherein at least one of said field anode and said field cathode is shaped to comprise non-uniformities.
A lighting tube having a first and a second end and comprising:
- a field anode and a field cathode arranged lengthwise along said tube to provide an electric field;
- magnets arranged lengthwise along said tube to provide a magnetic field, said magnets being arranged such that said magnetic field is substantially perpendicular to said electric field;
- said electric and magnetic fields together providing an electron path lengthwise along said tube;
- said tube being a low pressure tube having a pressure not exceeding two Tor.
A method of lighting comprising:
- within a confined space having a longitudinal length:
- providing a low pressure not exceeding two Tor;
- providing a magnetic field which is substantially uniform,
- providing an electrical field,
- said electrical and magnetic fields being set up orthogonally to one another along said longitudinal length;
- and placing an emission cathode at a location in said longitudinal length to provide electrons to travel along said longitudinal length under influence of said orthogonal fields.
Dependencies are inferred from the claim text.