The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 12, 2013
Filed:
Aug. 28, 2002
Michael Charles Lea, Bracknell, GB;
Michael Charles Lea, Bracknell, GB;
3M Innovative Properties Company, St. Paul, MN (US);
Abstract
A light-guide light is described that is capable of providing a substantially monochromatic beam of light, and is suitable for use as a signal lamp in an automotive vehicle. The light () comprises a housing defining a light-guiding optical cavity () having first and second major faces (), and a light source () arranged to direct light into the cavity from one side. The light source may be an array of light emitting diodes providing substantially monochromatic light. The first major face () comprises an interference film (for example, a multilayer polymeric film) that, for light at the design wavelength, substantially transmits light that is incident on the film over a limited angular range and substantially reflects light that is incident at other angles. The second major face () comprises a scattering reflective material having a reflectance of at least 85%, for example a highly-efficient reflective material provided with a suitable textured pattern.