Patent Application
20060291232
1. Field of the Invention
The invention relates to light assemblies for automotive vehicles. More particularly, the invention relates to a lens holder having an inner lens for diffusing heat emitted from a light source.
2. Description of the Related Art
Automotive vehicles include light assemblies for providing indicator signals visible to persons in other vehicle or as pedestrians. A light assembly typically includes a housing defining an enclosed space and a socket for supporting a light emitting source, such as an incandescent bulb, within the enclosed space. The housing also includes an outer lens that is colored according to its specific function, such as red for a stop signal and yellow or orange for turn signals. Packaging constraints due to aesthetics or function sometimes requires the design of a compact light assembly, resulting in a short distance between the light emitting source and the outer lens. But, the outer lens cannot be placed too close to the light emitting source due to heat that radiates therefrom. Thus, it remain desirable to provide a means of diffusing or blocking heat coming from the light emitting source to allow the design of a more compact housing for the light assembly.
According to one aspect of the invention, a lens assembly is provided for use with an automotive vehicle having a light source. The lens assembly includes a reflex lens, a lens holder, an internal lens and a metallic layer. The lens holder has an inner surface facing the light source. The holder has an outer surface opposite the inner surface. The lens holder is adapted for supporting the reflex lens along the outer surface. The internal lens is positioned between the light source and the reflex lens. The internal lens has an undulating surface facing the light source and defined by a plurality of annular bumps. The metallic layer is disposed along the undulating surface to provide enhanced scattering of light and heat energy away from the reflex lens to provide enhanced scattering of light and heat energy away from the reflex lens.
Advantages of the present invention will be readily appreciated as the same becomes better understood by reference to the following detailed description when considered in connection with the accompanying drawings, wherein:
An embodiment of the invention provides an optical light assembly for use on an automotive vehicle that includes a novel inner lens design that disperses heat and light energy emitted from a light source, which minimizes deformation of a plastic lens placed in proximity to the light source.
Referring to
The lens assembly 10 also includes an internal lens 20. The internal lens 20 is integrally formed with the lens holder 12 and is made of acrylic, polycarbonate or other conventional materials known by those skilled in the art. Optionally, the internal lens 20 is formed separate from and subsequently fixedly secured to the lens holder 12 by conventional methods, such as sonic welding or adhesives. The internal lens 20 is positioned along the inner surface 16 of the wall 14 adjacent the opening 20, so as to define a pocket or recess 21 along the outer surface 18.
The internal lens 20 is generally disc shaped with opposite first 22 and second 24 surfaces facing in generally the same direction as the inner 16 and outer 18 surfaces of the wall 14, respectively. The first surface 22 is defined by a plurality of outwardly extending light reflecting protrusions 26. Preferably, the protrusions 26 are pillow or generally hemispherically shaped, as shown in
A reflex lens 30 is seated in the recess 21 in the wall 14. The reflex lens 30 is generally parallel with the internal lens 20. A space is defined between the reflex lens 30 and the internal lens 20. A hole 28 is formed in the internal lens 20 to ventilate the space between the reflect lens 30 and the internal lens 20.
The lens assembly 10 also includes a back wall 40 spaced apart from the lens holder 12. The back wall 40 includes a conventional socket 42 for supporting a light source 44. The back wall 40 also includes a reflective surface 44 facing the lens holder 12. An outer lens 50 is fixedly secured to the back wall 40.
In use, light and heat are emitted from the light source 44. Light from the light source 44 and also light reflected from the reflective surface 44 of the back wall 40 pass through the lens holder 12 and the outer lens 50. Both light and heat from the light surface are diffused or scattered by the protrusions 26 so that the reflex lens 30 and the outer lens 50 remain below their respective heat deflection temperatures. Some of the light reflected by the protrusions 26 are directed toward the reflective surface 44, and re-directed outwardly through the outer lens 50. Thus, the internal lens 20 serves the dual purposes of minimizing the temperatures of the reflex 30 and outer lenses 50, and increasing the overall brightness of the light observed coming from the lens assembly 10.
Referring to
Referring to
The invention has been described in an illustrative manner. It is, therefore, to be understood that the terminology used is intended to be in the nature of words of description rather than of limitation. Many modifications and variations of the invention are possible in light of the above teachings. Thus, within the scope of the appended claims, the invention may be practiced other than as specifically described.
This application is a continuation-in-part of U.S. patent application Ser. No. 11/151,607 filed on Jun. 15, 2005, the contents of which are incorporated herein by reference in its entirety.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 11151607 | Jun 2005 | US |
| Child | 11345752 | Feb 2006 | US |
