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:
Aug. 09, 1977
Filed:
Mar. 15, 1976
Wolfgang W Witte, 777 Uberlingen, DT;
Other;
Abstract
A light beam passes through a physical pattern of opaque and transparent areas and is projected into space to an image plane. Upon an object appearing at the image plane the pattern is reflected back to the physical pattern as a second pattern image. The optical system is such that, in part, this second pattern image is a reversal of the pattern. The physical pattern is on a rotating drum to produce relative motion between the second pattern image and the pattern. Light from the second pattern image which passes through the pattern is received by a photoelectric cell to generate a signal. By having the pattern in the form of a spiral and the width of the pattern correspond to the width of the light beam at the point where it intersects the beam, various distances can be detected.