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:
Nov. 04, 1980
Filed:
Sep. 07, 1978
Seymour Feinland, Stamford, CT (US);
David Kleinschmitt, South Norwalk, CT (US);
Pitney Bowes Inc., Stamford, CT (US);
Abstract
Method and apparatus are disclosed for increasing accuracy of optical phase shift in quadrature systems by varying the angle at which light is directed through pairs of diffraction gratings. A more precise adjustment of the phase angle between two adjacent index gratings is achieved after manufacturing and assembly by using a light source and diverging or converging its rays of light. The accuracy of the phase shift of resultant signals is greatly improved over methods of mechanical alignment heretofore used. The improved accuracy allows for the manufacture of a broad tolerance system, with the inherent reduction of costs.