Jakob M Maya

US Patent:

6366020, Apr 2, 2002

Filed:

Aug 24, 1999

Appl. No.:

09/382408

Inventors:

Hongyon Gu - Lexington MA
Jakob Maya - Brookline MA

Assignee:

Matsushita Electric Works R D Laboratories Inc. - Woburn MA

International Classification:

H01J 6130

US Classification:

313634, 313635, 313613

Abstract:

A discharge lamp adapted to operate on DC current and being equivalent to an AC-operated ceramic metal halide lamp in different operating positions. The lamp comprises a ceramic arc tube with a fill of mercury, rare gas and metal halides. The arc tube is sealed with an anode and a cathode and has at least one metal heat shield on the cathode side of the ceramic DC metal halide arc tube to achieve operation of the lamp with universal orientation. Each of the two electrodes sealed into the arc tube are different, the anode being formed of tungsten with a ball shaped tip and the cathode being formed of a thoriated tungsten rod and a wound coil of the rod.

US Patent:

6369518, Apr 9, 2002

Filed:

Jan 28, 1999

Appl. No.:

09/239712

Inventors:

Timothy L. Kelly - Boston MA
Huiling Zhu - Lexington MA
Jakob Maya - Brookline MA

Assignee:

Matsoshita Electric Works R D Laboratories Inc

International Classification:

H05B 3702

US Classification:

315209R, 362263

Abstract:

A method and system of modifying one feature of a high-pressure lamp without significantly affecting the other features, the features including the luminosity, the color rendering index, the color temperature, or the deviation from the black body locus (D ). An arc discharge is initiated within the arc tube with a ballast imposing an alternating current waveform on the electrodes. In this way, the electrodes change from positive to negative in each cycle of operation. The waveform of each cycle is modified through the ballast to energize one electrode as positive or negative for a longer time than the other electrode, thereby altering the temperature distribution within the arc tube by changing the cold spot and hot spot temperatures in a lamp which has modifiable emission features.

US Patent:

6404141, Jun 11, 2002

Filed:

Mar 7, 2000

Appl. No.:

09/520103

Inventors:

Kouji Miyazaki - Osaka, JP
Shingo Matsumoto - Kadoma, JP
Mamoru Takeda - Kyoto, JP
Young-Jae Cho - Seoul, KR
Toshiaki Kurachi - Osaka, JP
Robert Chandler - Lexington MA
Oleg Popov - Needham MA
Jakob Maya - Brookline MA

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka
Matsushita Electric Works, Ltd. - Osaka

International Classification:

H01J 6152

US Classification:

315248, 313234, 313607

Abstract:

In a conventional electrodeless discharge lamp, a large amount of magnetic field leaks from at light-transparent envelope, and the efficiency of conversion from electric power to light energy is low. In a electrodeless discharge lamp in which light-emitting gases in a light-transparent envelope are excited with a magnetic field generated from a coil, end portions of a magnetic material included in the coil are substantially axially disposed in the light-transparent envelope. As a result, the magnetic flux which leaks outside the light-transparent envelope is decreased so the density of the magnetic flux in the envelope is increased and the efficiency of the lamp is improved.

US Patent:

6433478, Aug 13, 2002

Filed:

Nov 9, 1999

Appl. No.:

09/435960

Inventors:

Robert Chandler - Lexington MA
Oleg Popov - Needham MA
Edward K. Shapiro - Lexington MA
Jakob Maya - Brookline MA

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka
Matsushita Electric Works, Ltd. - Osaka

International Classification:

H01J 162

US Classification:

313607, 313 27, 313 45, 313 46, 313 47, 313234, 315248

Abstract:

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.

US Patent:

6441564, Aug 27, 2002

Filed:

Oct 4, 2000

Appl. No.:

09/679105

Inventors:

Hongyan Gu - Lexington MA
Martin Muzeroll - Merrimack NH
John Chamberlain - Somerville MA
Jakob Maya - Brookline MA

Assignee:

Matsushita Electric Works Research and Development Laboratories Inc - Woburn MA

International Classification:

G05F 100

US Classification:

315291, 315246, 315271, 315307

Abstract:

A dimmable electrical discharge lamp providing radiation and having a CRI of over 90 and a color temperature of between about 3000-4000Â K even when dimmed by up to 40% of its rated power. The lamp contains a fill of a mixture of cesium, mercury and a rare gas. The fill is enclosed in a hermetically sealed polycrystalline alumina arc tube having an electrode at each end and the arc tube is enclosed in an outer jacket. The lamp is provided with a circuit for providing current to the arc tube. A low frequency wave simmer current is provided and one or more current pulses are superimposed on the simmer current. The gradient of the leading edge of the pulse is short whereby to generate a high electrical field and cause a high degree of ionization of the cesium.

US Patent:

6501220, Dec 31, 2002

Filed:

Oct 18, 2000

Appl. No.:

09/691509

Inventors:

Stefaan Lambrechts - Beverly Farms MA
Jakob Maya - Brookline MA

Assignee:

Matushita Research and Development Laboraties Inc - Woburn MA

International Classification:

H01J 1720

US Classification:

313571, 313637

Abstract:

A thallium-free high pressure ceramic metal halide lamp having superior dimming characteristics with a fill composition comprising MgI and CeI. In addition, the fill chemistry comprises NaI and the halides of rare earth metals such as Dy, Ho and Tm.

US Patent:

6548965, Apr 15, 2003

Filed:

Feb 16, 2000

Appl. No.:

09/505756

Inventors:

Jakob Maya - Brookline MA
Oleg Popov - Needham MA
Robert Chandler - Lexington MA

Assignee:

Matsushita Electric Works Research and Development Labs Inc. - Woburn MA

International Classification:

H05B 4116

US Classification:

315248, 313628

Abstract:

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.

US Patent:

6555954, Apr 29, 2003

Filed:

Jul 14, 2000

Appl. No.:

09/616167

Inventors:

Robert Chandler - Lexington MA
Edward K. Shapiro - Lexington MA
Oleg A. Popov - Needham MA
Jakob Maya - Brookline MA

Assignee:

Matsushita Electric Industrial Co., Ltd. - Osaka
Matsushita Electric Works, Ltd. - Osaka

International Classification:

H01J 162

US Classification:

313485, 313 46, 313161, 315248

Abstract:

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.