Illumination – Self powered lamp – Having plural lamp bulbs or lamp sockets
Patent
1998-03-19
2000-08-01
O'Shea, Sandra
Illumination
Self powered lamp
Having plural lamp bulbs or lamp sockets
362183, 362159, 362249, 362157, 362208, 362800, 315224, 315307, 315291, 315312, 315360, 315362, H04B 1004
Patent
active
060956615
ABSTRACT:
Improved method and apparatus for hand-held portable illumination. A flashlight and corresponding method are described. The flashlight includes a housing, a plurality of LEDs, and an electrical circuit that selectively applies power from the DC voltage source to the LED units, wherein the flashlight is suitable for handheld portable operation by a user. In one embodiment, the first electrical circuit further includes a control circuit for maintaining a predetermined light output level of the LED units as a charge on a battery varies. In another embodiment, the control circuit maintains an average predetermined light output level of the LED units as the charge on the battery cell varies by changing a pulse width or frequency as the charge on the battery cell varies to maintain a given average light output. Another aspect provides an illumination source that includes a light-emitting diode (LED) housing including one or more LEDs, and a control circuit that selectively applies power from a source of electric power to the LEDs, the control circuit substantially maintaining a light output characteristic of the LEDs as a voltage of the voltage source varies over a range that would otherwise vary the light output characteristic. Still another aspect provides an illumination source including a light-emitting diode (LED) housing including one or more LEDs; and a control circuit that selectively applies power from a source of electric power to the LEDs, thus maintaining or controlling a light output color spectrum of the LEDs.
REFERENCES:
patent: 4208579 (1980-06-01), Scrivo
patent: 4290095 (1981-09-01), Schmidt
patent: 4346329 (1982-08-01), Schmidt
patent: 4509266 (1985-04-01), Cusack
patent: 4592147 (1986-06-01), Herman
patent: 4820229 (1989-04-01), Spraggins
patent: 4831504 (1989-05-01), Nishizawa et al.
patent: 4893815 (1990-01-01), Rowan
patent: 4962347 (1990-10-01), Burroughs et al.
patent: 4964023 (1990-10-01), Nishizawa et al.
patent: 4978857 (1990-12-01), Juengel
patent: 5015918 (1991-05-01), Copeland
patent: 5065035 (1991-11-01), Juengel
patent: 5179335 (1993-01-01), Nor
patent: 5279513 (1994-01-01), Connelly
patent: 5299227 (1994-03-01), Rose
patent: 5424927 (1995-06-01), Schaller et al.
patent: 5838247 (1998-11-01), Bladowski
patent: 5890794 (1999-04-01), Abtahi et al.
Bourn Charles T.
Lebens Gary A.
Lemaire Charles A.
O'shea Sandra
PPT Vision, Inc.
Zeade Bertrand
LandOfFree
Method and apparatus for an L.E.D. flashlight does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for an L.E.D. flashlight, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for an L.E.D. flashlight will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-656923