Xiaofeng Xu resumes & CV records
Resumes
Xiaofeng Xu
Xiaofeng Xu
Xiaofeng Xu, 36Fremont, CA
Xiaofeng Xu Phones & Addresses
Fremont, CA
Redwood City, CA
Atlanta, GA
Mentions for Xiaofeng Xu
Publications & IP owners
Us Patents
Color Tunable Light Source
US Patent:
7703943, Apr 27, 2010
Filed:
May 7, 2007
Appl. No.:
11/800976
Inventors:
Yi-Qun Li - Danville CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Ian Collier - Goldhanger, GB
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Ian Collier - Goldhanger, GB
Assignee:
Intematix Corporation - Fremont CA
International Classification:
F21V 9/00
US Classification:
362231, 362235, 359237
Abstract:
A color tunable light source comprises: a first light emitting diode (LED) arrangement operable to emit light of a first color and a second LED arrangement operable to emit light of a second color, the combined light output comprising the output of the source. One or both LED arrangements comprises a phosphor provided remote to an associated LED operable to generate excitation energy of a selected wavelength range and to irradiate the phosphor such that it emits light of a different color wherein light emitted by the LED arrangement comprises the combined light from the LED and phosphor and control means operable to control the color by controlling the relative light outputs of the two LED arrangements. The color can be controlled by controlling the relative magnitude of the drive currents of the LEDs or by controlling a duty cycle of PWM drive current.
Color Temperature Tunable White Light Source
US Patent:
8203260, Jun 19, 2012
Filed:
Apr 13, 2007
Appl. No.:
11/787107
Inventors:
Yi-Qun Li - Danville CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Assignee:
Intematix Corporation - Fremont CA
International Classification:
H01J 1/62
US Classification:
313502, 345 83, 345 82, 315112, 315113, 315156, 3151691, 315291, 315294, 315312, 315360
Abstract:
A color temperature tunable white light source comprises: first and second LED arrangements operable to emit light of first and second wavelength range respectively that are configured such that their combined light output, which comprises light generated by the source, appears white in color. One or both LED arrangements comprises a phosphor provided remote to an associated LED operable to generate excitation radiation and to irradiate the phosphor such that it emits light of a different wavelength range, wherein the light emitted by the LED arrangement comprises the combined light from the LED and phosphor. The color temperature of output white light is tunable by controlling the relative light outputs of the LED arrangements by for example controlling the relative magnitude of the drive currents of the LEDs or a duty cycle of a pulse width modulated drive current.
Color Tunable Light Source
US Patent:
2010005, Mar 4, 2010
Filed:
Nov 12, 2009
Appl. No.:
12/617575
Inventors:
Yi-Qun Li - Danville CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Ian Collier - Fremont CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Ian Collier - Fremont CA, US
Assignee:
INTEMATIX CORPORATION - Fremont CA
International Classification:
H05B 41/16
US Classification:
315287
Abstract:
A color tunable light source comprising: a first LED arrangement operable to emit light of a first color and a second LED arrangement operable to emit light of a second color, the LED arrangements being configured such that their combined light comprises the output of the source and control means operable to control the color of light emitted by the source by controlling the relative light outputs of the two LED arrangements wherein the control means is operable to dynamically switch the outputs of the LED arrangements and the color is tunable by controlling a duty cycle of the drive current. One or both LED arrangements can comprise at least one phosphor and an associated LED that is operable to irradiate the phosphor with excitation radiation of a first wavelength range such that the phosphor emits light of a different wavelength range.
Color Temperature Tunable White Light Source
US Patent:
2011020, Aug 25, 2011
Filed:
May 6, 2011
Appl. No.:
13/102448
Inventors:
Yi-Qun Li - Danville CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Yi Dong - Tracy CA, US
Xiaofeng Xu - Fremont CA, US
Assignee:
INTEMATIX CORPORATION - Fremont CA
International Classification:
H05B 37/02
H05B 41/16
H05B 41/16
US Classification:
315210, 315294, 315250
Abstract:
A color temperature tunable white light source comprises a first LED arrangement comprising at least one blue emitting LED configured to excite a remote phosphor and a second LED arrangement comprising at least one red emitting LED. The LED arrangements are configured such that the composite light emitted by the LED arrangements appears white in color. The relative drive currents of the LEDs is controllable, and thus variable in relative magnitude, such that the color temperature of the composite light emitted by the source is electrically tunable.
Possible Relatives
NOTICE: You may not use BackgroundCheck or the information it provides to make decisions about employment, credit, housing or any other purpose that would require Fair Credit Reporting Act (FCRA) compliance. BackgroundCheck is not a Consumer Reporting Agency (CRA) as defined by the FCRA and does not provide consumer reports.