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:
Jul. 07, 2015
Filed:
Oct. 16, 2009
Robert James Neil Mclean, Essex, GB;
Robert James Neil McLean, Essex, GB;
Buhler Sortex Ltd, London, GB;
Abstract
A light guide () for delivering an illumination, in particular a reference or background illumination, the light guide comprising: a mirror box () which defines a mirror cavity (), which receives a light source () therein, and includes an illumination aperture () from which an illumination is delivered; a transmissive diffuser () which is located at the illumination aperture to render the illumination diffuse; and a shutter member () which is movable into the cavity to obstruct the light source and provide for control of the radiance of the delivered illumination, whereby control of the radiance of the delivered illumination is determined by a position of the shutter member in the cavity.