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US 5,313,144 AGranted
Power balanced coupling structure for electrodeless discharge lamp
AssigneeOsram Sylvania Inc.
InventorsScott J. Butler, Walter P. Lapatovich, Jason R. Bochinski
Life of this patent
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Abstract
An electrodeless HID lamp formed with a power balanced coupling structure is disclosed. Microwave transmission to the discharge capsule is divided into two channels having an electrical length differential of about a half wave length. A balancing strap line is coupled between the two transmission lines where they deliver power to the field applicators for the discharge capsule. The strap line balances the power delivery between the two ends of the discharge tube.
Claims18
An electrodeless lamp having a power balanced coupling structure comprising:
- a) a microwave power input line for receiving input microwave power with an operating frequency,
- b) a first transmission line receiving power from the input power line, having a first electrical length and coupling at a first connection,
- c) a second transmission line receiving power from the input power line, having a second electrical length and coupling at a second junction, wherein the differential electrical length between the first transmission line and the electrical length of the second transmission line is a first odd number of half wave lengths of the operating frequency,
- d) a strap line coupling between the first connection and the second junction and having a third electrical length being a second odd multiple of half wavelengths of the operating frequency,
- e) a first applicator coupled at the first connection to received microwave power from the first transmission line,
- f) a second applicator coupled at the second junction to received microwave power from the second transmission line, and
- g) a discharge capsule receiving microwave power from the first applicator, and the second applicator to excite the chemical species contained therein and thereby emit useful electromagnetic radiation in the wavelength region between a hundred nanometers and a thousand nanaometers, generally known to be ultraviolet, visible and infrared light.
4 more elements
Dependencies are inferred from the claim text.