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. 14, 1978
Filed:
Dec. 27, 1976
Fred Mast, Wil, CH;
Gretag Aktiengesellschaft, Regensdorf, CH;
Abstract
A head for measuring light diffusely reflected from a surface, the head having an optical projection system for projecting light onto a surface to be measured, and another optical system for collecting the light diffusely reflected from that surface and imaging it on a photodiode. The collecting optics comprise a spherical annular mirror coaxially aligned with an annular transparent planar member which has an annular plane mirror mounted underneath it, the projected light passing through the apertures in the annular mirror, the planar member, and the annular planar mirror. The light diffusely reflected from the surface to be measured passes through the planar member onto the spherical mirror which reflects it back through the member onto the planar mirror which in turn reflects it back through the planar member onto reducing optics which images the reflected light onto the photo-diode.