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:
Dec. 23, 1980
Filed:
Jun. 14, 1979
Michael F Praamsma, Santa Monica, CA (US);
Vivitar Corporation, Santa Monica, CA (US);
Abstract
A light mixing system for use in a photographic enlarger in which light from a light source is admitted to a light mixing module through an aperture (and/or through a light modifying filter system for color correction for color enlargements) to mix light beams to provide substantially uniform energy distribution at the outlet port of the light mixing module. The light mixing module includes a lens having a conical surface to receive the admitted light beams and to direct the light beams along angular paths with respect to the axis of the conical surface. The lens interfaces with a diffuser means comprising a multitude of fiber optic elements each adapted to receive light beams along the angular path, to transmit and reflect the light beams and to cause the light beams to depart the exit end of the fiber optic element in the form of a fan or cone of substantially the same angle as that of the light beams at the lens for mixing said beams. A light guide means further mixes the exiting mixed light beams from the fiber optic diffuser and exits such beams into a frustoconical chamber having light reflecting and diffusing surfaces to provide an evenly distributed diffuse secondary light source of expanded areas.