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:
Apr. 28, 1981
Filed:
May. 02, 1979
William T Fearnside, Fishers, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
In accordance with a presently preferred embodiment of the invention, a servo control loop is disclosed using optical feedback to control the movement of a small, lightweight scanning mirror. The optical feedback is accomplished by reflecting radiation from the scanning mirror and imaging such radiation onto a pair of radiation detectors. An optical element having alternate relatively transparent and opaque regions is disposed in the optical path between the scanning mirror and the detectors to modulate in phase quadrature the intensity of radiation beams received by the detectors. The output signals from the detectors are used to develop a feedback signal to close the servo loop.