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US 7,252,405 B2Granted
LED lantern with fresnel lens
AssigneeAutomatic Power, Inc.
InventorsStephen E. Trenchard, Alan Trojanowski
Life of this patent
Estimating the term…
Abstract
A lighting device having a plurality of LEDs mounted on a heat sink that serves to transfer heat from the LEDs to the outside environment. The lighting device is positioned within a fresnel lens to produce a distribution of light.
Claims21
A lighting device comprising:
- (a) a plurality of LEDs disposed in a radial array about a vertical axis;
- (b) a central member having each LED mounted on a vertical surface thereof, the central member made of a thermally conductive material to conduct heat away from the LEDs, wherein the central member has a first and second circular disk mounted on opposed ends of the central member transverse to the vertical axis of the central member;
- (c) a tubular member surrounding the central member, wherein the tubular member is mounted in a first groove in the first circular disk and a second opposed end of the tubular member is mounted in a second groove in the second circular disk and wherein the light from the LEDs passes through the tubular member;
- and
- (d) a fresnel lens encircling the tubular member.
2 more elements
A lighting device comprising:
- (a) a plurality of LEDs disposed in a radial array about a vertical axis;
- (b) a central member having each LED mounted on a vertical surface thereof, the central member made of a thermally conductive material to conduct heat away from the LEDs, wherein the central member comprises three substantially identical right angle prisms with substantially identical square horizontal cross-sections with four vertical surfaces;
- (c) a tubular member surrounding the central member, wherein the light from the LEDs passes through the tubular member;
- and
- (d) a fresnel lens encircling the tubular member.
2 more elements
A lighting device comprising:
- (a) a lighting assembly having
- (i) a heat sink having at least one centralized right angle prism with a square horizontal cross-section with a plurality of vertical surfaces,
- (ii) a plurality of equispaced LEDs, each LED mounted on a vertical surface of the heat sink, and
- (iii) a tubular diffuser having a frosted surface, wherein the frosted surface surrounds the LEDs to diffuse the light emitted from the LEDs;
- and
- (b) a fresnel lens surrounding the lighting assembly;
- whereby light emanating from the LEDs passes through the diffuser and the fresnel lens to provide a substantially uniform horizontal plane of light.
4 more elements
A lighting device comprising:
- (a) a central member having a plurality of similar centralized right angle prisms with square horizontal cross-sections, the central member made of a thermally conductive material to conduct heat away from the LEDs;
- (b) a plurality of equispaced LEDs, each LED mounted on a vertical surface of the central member, wherein the LEDs are disposed in a radial array about a vertical axis of the central member;
- and
- (c) a fresnel lens encircling the radial array of LEDs, wherein the fresnel lens includes a focal point in a horizontal plane that intersects the radial array of LEDs.
1 more element
Dependencies are inferred from the claim text.