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Matsushita Electric Works, Ltd.

Matsushita Electric Works Research and Development Laboratories Inc

Matsushita Research and Development Laboratories Inc

Matsushita Electric Works Research and Development Labs Inc.

Robert T Chandler

Oleg A Popov

Jakob Maya

Edward K Shapiro

Mamoru Takeda

Toshiaki Kurachi

Kouji Miyazaki

Shinichi Anami

Jagannathan Ravi

Young-Jae Cho

Shingo Matsumoto

An elevated platform cooling assembly includes a portable assembly frame; a mast carried by the assembly frame, the mast selectively positional between a folded, collapsed transport configuration and an erected, extended functional and operational configuration; a fan carried by the mast; a fan motor drivingly engaging the fan; a working fluid pump and supply mechanism disposed in fluid communication with the fan motor; and 4 prime mover drivingly engaging the working fluid pump and supply mechanism. A method of cooling an elevated platform is also disclosed.

Elevated platform cooling assembly and method

An electrodeless lamp includes a bulbous lamp envelope enclosing an inert gas and a vaporizable metal fill, the lamp envelope having a reentrant cavity; an electromagnetic coupler positioned within the reentrant cavity; and a cold spot structure configured for low temperature, low duty cycle operation and for room temperature, 100% duty cycle operation. In some embodiments, the cold spot structure includes a dimple in the lamp envelope, the dimple having a thinned sidewall. In further embodiments, a shield is positioned near the dimple to control cold spot temperature. In additional embodiments, the cold spot structure includes a heat sink attached to the exhaust tube of the lamp envelope and thermally isolated from the lamp base.

Electrodeless fluorescent lamp with controlled cold spot temperature

An electrodeless lamp includes a bulbous lamp envelope enclosing an inert gas and a vaporizable metal fill, the lamp envelope having a reentrant cavity and an envelope bottom, an electromagnetic coupler positioned within the reentrant cavity, and a thermal shield positioned in proximity to the envelope bottom and configured to increase the temperature of the envelope bottom. By increasing the temperature of the envelope bottom, a cold spot is prevented. As a result, light output at low temperatures is comparable to light output at room temperature.

Electrodeless fluorescent lamp with stabilized operation at high and low ambient temperatures

An electrodeless lamp includes an envelope ( ) containing a fill of discharge gas, a magnetic core t( ), an induction coil ( ) wound around the magnetic core ( ), a driver circuit for supplying an electric current to the induction coil ( ) to operate the electrodeless lamp, a socket ( ) for receiving electrical power supplied to the electrodeless lamp, and a heat conduction means ( ) thermally coupled to the magnetic core ( ) for conducting heat generated in the magnetic core ( ) to the ambient atmosphere to dissipate heat therein, or coupled to the socket ( ) for conducting heat generated in the magnetic core ( ) to the socket to dissipate heat therethrough.

Electrodeless lamp

An electrodeless low pressure discharge lamp comprises an envelope made from a straight tube and a reentry cavity sealed to one of tube's ends. The cavity has several hollow ferrite cores separated from each other with a few mm distance. Each ferrite core has an induction coil of few turns wound around the core. Each cavity has a cooling copper tube or rod located inside the ferrite core that removes heat from the cores and dumps the heat into a heat sink welded to the cooling tube/rod thereby keep the temperature of the ferrite cores below their Curie point. Each induction coil is electrically connected to the matching network while all matching networks are connected in parallel to the high frequency power source (driver). Inductively coupled plasmas generated in the envelope by several core/coil assemblies produce axially uniform UV and visible radiation.

Electrodeless low pressure lamp with multiple ferrite cores and coils

The present invention comprises a compact electrodeless fluorescent lamp that includes a transparent envelope containing a fill of inert gas along with a vaporizable metal such as mercury. An induction coil is operated by a driver circuit, and is positioned inside of a reentrant cavity in the envelope with an adjacent permeable magnetic field manipulation structure having a shunting surface ending at a shunting surface periphery. A thermally and electrically conductive primary cooling structure is positioned adjacent the magnetic field manipulation structure to extend within the shunting surface periphery while being separated from the induction coil thereby. A further component cooling structure is provided to at least partially enclose the driver circuit connected to the induction coil.

Compact electrodeless fluorescent lamp with improved cooling

An electrodeless fluorescent lamp employs a glass envelope made from a single linear tube or bulb and a reentry cavity disposed on the envelope axis and sealed to the envelope. The envelope is filled with inert gas and mercury vapor. Phosphor and protective coatings are disposed on the inner surfaces of the envelope and the cavity. An induction coil of A few turns made from silver coated copper wire is wrapped around the envelope in its axial direction. The inductively-coupled axially uniform plasma is generated inside the envelope. The discharge electric field and current form a closed-loop path inside the envelope along its walls. The introduction of the reentry cavity decreases the lamp wall loading without loosing lamp power efficiency and efficacy. The lamp is operated at frequencies from 50 kHz to 200 MHz and RF power from 5 W to 2000 W without the use of ferrite inside of the reentry cavity.

Electrodeless fluorescent lamp with low wall loading

An electrodeless fluorescent lamp comprises a closed-loop (&ldquo;tokamak&rdquo;) envelope, two ferrite cores, and an induction coil that is disposed on the envelope walls inside the closed-loop formed by the envelope. The envelope comprises two straight tubes of the same diameter. All coils' turns have essential the same length and are parallel to each other and to the closed-loop axis. Each ferrite core encircles a segment of each the coil's turn and one connecting tube. The lamp can be operated at driving frequencies of 100-600 kHz and lamp powers of 50-250 W. The ferrite core power losses were 6-8 W when the lamp was operated at a frequency of 200-300 kHz and lamp power of 140-150 W. The lamp light output was 12,500 lumen and luminous efficacy was 87 LPW.

High light output electrodeless fluorescent closed-loop lamp

An electrodeless compact fluorescent lamp operated at a frequency from 50 KHz to 1000 KHz and RF power from 10 W to 40 W is described. The lamp includes a bulbous glass envelope ( ) filled with rare gas and metal vapor, reentrant glass cavity ( ), an induction coil ( ) made from Litz wire, a ferrite assembly comprising a ferrite core ( ) and MnZn ferrite disk ( ), a cooling structure comprising a metal (or ceramic) tube ( ) positioned inside the ferrite core ( ) and a metal (or ceramic) unit ( ) that transmits the heat from the cavity and ferrite assembly to the Edison socket ( ), a thermal shield ( ), and a driver and matching network located inside the lamp base ( ). A protective coating ( ) and phosphor coating ( ) are coated on the inner surface of the envelope ( ) and reentrant cavity ( ). The reflective coating ( ) made from alumina is coated on the inner surface of the cavity ( ) and on the outer surface of the envelope bottom ( ). The mercury pressure is controlled in the envelope by the temperature of the amalgam ( ) positioned in the tubulation ( ) or by the temperature of pure mercury located in the cold spot.

High frequency electrodeless compact fluorescent lamp

Electrodeless discharge lamp

An electrodeless fluorescent lamp employs a glass envelope made from a single linear tube filled with inert gas and mercury vapor. Phosphor and protective coatings are disposed on the inner surface of the envelope walls. An induction coil of few turns made from silver coated copper or Litz wire is wrapped around the linear tube in its axial direction. The inductively-coupled axially uniform plasma is generated inside the linear tube. The discharge electric field and current form a closed-loop path inside a tube in its axial direction. The lamp is operated at frequencies from 100 KHz to 100 MHz and RF power from 10 W to 2000 W (dependent on lamp size and number of turns). The lamp power efficiency and efficacy are comparable to those in electrodeless lamps of closed-loop shape operated with and without ferrite core.

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Lexington, MA, United States of America

Robert T Chandler