Huiling Zhu, Age 67101 Kendall Rd, Lexington, MA 02421

6369518, Apr 9, 2002

Jan 28, 1999

09/239712

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

Matsoshita Electric Works R D Laboratories Inc

H05B 3702

315209R, 362263

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.

6717364, Apr 6, 2004

Jul 28, 2000

09/627841

Huiling Zhu - Lexington MA
Jakob Maya - Brookline MA

Matsushita Research Development Labs Inc - Woburn MA

H01J 1720

313642, 313641

A [thallium free] high pressure ceramic metal halide lamp having superior dimming characteristics with a fill composition including MgI and/or MgBr.

6819050, Nov 16, 2004

May 2, 2003

10/428303

Huiling Zhu - Lexington MA
Stefaan Maria Lambrechts - Beverly MA
Jakob Maya - Brookline MA

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

H01J 1720

313639, 313637, 313640

An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable ceramic walls about a discharge region. A pair of electrodes are supported in the discharge region spaced apart from one another. Ionizable materials are provided in the discharge region comprising mercury, a noble gas, and at least two metal halides including a magnesium halide and a sodium halide, a rare earth clement, and thallium iodide in a molar quantity which is between 0. 7 and 5% of that total molar quantity of all halides present in the discharge chamber.

6856079, Feb 15, 2005

Sep 30, 2003

10/674707

Huiling Zhu - Lexington MA, US

Matsushita Electric Industrial Co., Ltd. - Osaka

H01J005/50

313326, 313332, 313623

An arc discharge metal halide lamp having a discharge chamber with visible light permeable walls bounding a discharge region through which walls a pair of electrode assemblies are supported with interior ends thereof positioned in the discharge region spaced apart from one another. These electrode assemblies each also extend through a corresponding capillary tube affixed to the walls to have exterior ends thereof positioned outside the arc discharge chamber. At least one of these electrode assemblies comprises an electrode discharge structure with a discharge region shaft extending into the capillary tube corresponding thereto. A helical coil positioned in part about the discharge region shaft extends outwardly in that corresponding capillary tube to be in direct contact with an interconnection shaft extending outside of that corresponding capillary tube to provide an exterior end of this electrode assembly.

6856091, Feb 15, 2005

Jun 24, 2002

10/178831

Timothy Lee Kelly - Boston MA, US
Jagannathan Ravi - Bedford MA, US
Huiling Zhu - Lexington MA, US

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

H01J017/18
H01J061/36
H01J005/50

313623, 313326, 313331, 313332

A discharge chamber for an arc discharge metal halide lamp having light permeable walls bounding a discharge region in which ionizable materials are provided with at least one electrode accommodation opening therein extending along a selected path between that discharge region and a region outside those walls. An electrode arrangement extends through the electrode accommodation opening having therein a thin electrical conductor positioned at least in part therein with a major surface that has surface curvature in at least some of those portions thereof positioned in said electrode accommodation opening to be in one of many alternative configurations. A sealing frit of mixed metal oxides is positioned about at least a portion of the thin electrical conductor within the electrode accommodation opening both at the major surface thereof and on an opposite side thereof.

6979958, Dec 27, 2005

Jan 31, 2002

10/062078

Huiling Zhu - Lexington MA, US
Shin Ukegawa - Kyotanabe, JP
Hiroshi Nohara - Nishinomiya, JP
Jakob Maya - Lexington MA, US

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

H05B041/16
H01J017/20

315246, 313638

An arc discharge metal halide lamp for use in selected lighting fixtures having a discharge chamber with light permeable ceramic walls of a selected shape about a discharge region of a selected volume. A pair of electrodes are supported in the discharge region separated from one another by a separation length. The separation length is in a ratio to the effective inner diameter that is greater than four. Ionizable materials are provided in the discharge region comprising a quantity of mercury in a ratio to the discharge region volume that is less than 4 mg/cm, a noble gas, praseodymium halide, and sodium halide.

7049768, May 23, 2006

Nov 24, 2004

10/996905

Huiling Zhu - Lexington MA, US
Jakob Maya - Brookline MA, US

Matsushita Electric Works Ltd. - Osaka

G05F 1/00

315307, 315291, 315246, 315247, 315DIG 7, 315360, 315149

A lighting system includes a high intensity discharge metal halide lamp having an arc discharge chamber with electrodes at each end and containing a fill of mercury, rare gas and metal halides, and a ballast circuit configured to supply pulsed electrical power to the lamp. The ballast circuit includes a controller configured to adjust the pulsed lamp power between a first relatively high power level at a relatively high duty cycle and a second relatively low power level at a relatively low duty cycle. The controller may be configured to adjust the pulsed lamp power between 90% duty cycle at rated lamp power and 10% duty cycle at 30% of the rated lamp power. The duty cycle of the pulsed lamp power may be controlled to maintain a substantially constant correlated color temperature (CCT) as the power level is adjusted.

7138765, Nov 21, 2006

Sep 8, 2003

10/657380

Shinichi Anami - Wellesley MA, US
Nanu Brates - Winchester MA, US
Stefaan M. Lambrechts - Beverly MA, US
Huiling Zhu - Lexington MA, US
Jakob Maya - Brookline MA, US

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

H05B 31/38
H05B 31/00

313620, 313637, 313639, 313634

An arc discharge metal halide lamp having a discharge chamber having visible light permeable walls bounding a discharge region supported electrodes in a discharge region spaced apart by a distance Lwith an average interior diameter equal to D so they have a selected ratio. Ionizable materials are provided in this chamber involving a noble gas, one or more halides, and mercury in an amount sufficiently small so as to result in a relatively low maximum voltage drop between the electrodes during lamp operation.