1. Field of the Invention
The invention relates to electric lamps and particularly to automotive electric lamps. More particularly the invention is concerned with automotive LED lamp assemblies.
2. Description of the Related Art Including Information Disclosed Under 37 CFR 1.97 and 1.98
Vehicle manufacturers are rapidly adopting light emitting diodes (LEDs) as light sources for use in vehicles. LEDs offer various advantages over incandescent lamps, and in particular they can be mounted in relatively thinner packages, requiring for example less of the trunk volume to accommodate the lamp depth. Making lamps smaller is not a completely good thing. Signal lamps must be visually distinguishable so an observer can mentally separate the intended messages. With incandescent lamps, this is achieved by spacing them sufficiently far apart so the differing signals visually do not overlap or bleed into each other. LED lamps can also be separated, but LED lamps can be relatively more expensive, and multiple lamps may not be economic. There is then a need for a lamp system that uses LEDs, but provides distinguishable regions of illumination on a vehicle.
A vehicle light assembly may be made from a lamp having a plurality of LED light sources arrayed circumferentially around the lamp; a reflector body having a reflector axis generally directed to a field to be illuminated. A plurality of reflective surfaces is formed on the front side, the respective reflective surfaces separated by one or more axially extending walls. A through passage is formed in the reflector body, sized and shaped to receive a portion of the lamp, and intersecting a planar extension of at least one of the axially extending walls separating a first reflective surface from a second reflective surface. The planar extension intersects the lamp between a first LED and a second LED whereby light from the first LED substantially shines toward the first reflective surface and the light from the second LED shines toward the second reflective surface.
A bayonet coupling between the reflector and lamp is preferred, but the coupling may be threaded, clipped, frictional, glued or similarly accomplished. The base may also include an electrical socket to receive an electrical connection to supply power for the LEDs. Electrical circuitry may also be included in the assembly, for example circuitry for voltage or current adjustment, temperature compensation, voltage or current safety control, switching means and so on may be included. It is known in the art that dispersing heat from the LEDs improves the LED performance and life, and that copper or similar high heat conductive materials may be used advantageously in the construction of an LED lamp to conduct heat from the LEDs to an exterior heat sink, such as an exposed metal disk or heat conductive metal fins.
The reflector body has a reflector axis extending from a backside of the reflector body to a front side of the reflector body, and is also generally directed to the field to be illuminated. The front side of the reflector is divided into a plurality of reflective surfaces. The reflective surfaces are separated by one or more walls that extend in one direction in the reflector axis direction. The walls are preferably as thin as possible to maximize the reflective surface areas, and at the same time light impermeable so light shone onto on reflective surface does not bleed into a second reflective surface. The reflector body also includes a defined through passage extending from the backside to the front side. The through passage is sized and shaped to receive at least a portion of the lamp 10, so the lamp 10 may be inserted through the through passage from the backside to expose the LEDs, on the distal end 36 on the front side of the reflector body. Light from the LEDs, may be then shone on the respective reflective surfaces. The preferred through passage is also positioned to intersect at least one and preferably a plurality of planar extensions axially extend from the walls separating the reflective surfaces. Restated, the preferred separating walls radiate away from the defined passage. The walls then divide the space on the front side of the reflector body, around the through passage where the lamp 10 is exposed into compartmentalized volumes. A first wall then separates a first reflective surface from a second reflective surface, and so on. In the preferred embodiment, the planar extensions of the separating walls intersect the lamp 10 between where adjacent sets of the LEDs, are located. A planar extension of a first wall them separates at least a first LED and at least a second LED whereby light from the first LED substantially shines toward the first reflective surface and light from the second LED shines toward the second reflective surface and an intermediate wall acts as a block between the reflector surfaces. Similarly other wall sections may separate the light emitted from other sets of LEDs and permits that respective light to be shone only a corresponding reflective surface. There may be one or more LEDs in any of the sets of LEDs whose light is directed to a particular reflective surface. Two or more LEDs may then be associate with the lighting of a particular reflective surface, but not with other reflective surfaces. In general, LEDS providing a first color combination illuminate a first set of reflective surfaces, while LEDs providing a second color combination illuminate a different set of reflective surfaces. The variously reflective surfaces may otherwise be allocated in a variety fashions around the through passage. One preferred embodiment is to divide the reflector body into equal angular sections around the through passage, as equal pie slices radiating from the central located through passage. In the preferred embodiment the reflector body is made from a molded plastic with the general form of a dish divided by on or more vertical walls diving the dish into compartments that open onto a common through passage. It is understood that the various compartments need only receive light from the respective sets of LEDs, so the compartments may be exposed via an open window or via a light transmissive window adjacent the respective LEDs.
While there have been shown and described what are at present considered to be the preferred embodiments of the invention, it will be apparent to those skilled in the art that various changes and modifications can be made herein without departing from the scope of the invention defined by the appended claims.
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Number | Date | Country |
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1 371 901 | Dec 2003 | EP |