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:
Feb. 03, 1987
Filed:
Jul. 13, 1984
Eugene R Schlesinger, Wilton, CT (US);
The Perkin-Elmer Corporation, Norwalk, CT (US);
Abstract
In an optical system with an optical axis in which an image is to be focused at an image plane, an improved chopper which can be driven at a high rate for obtaining dither about the focal point in the system includes first and second chopper blades, each having at least one notch in their periphery, the chopper blades mounted to a common shaft adapted for rotation, parallel to each other and essentially perpendicular to the optical axis and on opposite side of the image plane, the outputs of one of the blades will representing an ahead of focus edge response and the other of said blades a behind focus edge response which can be sensed and processed to carry out correction of the optical system.