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:
Jun. 27, 1978
Filed:
Apr. 12, 1977
David L Peters, Whitney Point, NY (US);
The Singer Company, Binghamton, NY (US);
Abstract
An active retrace beam is used to reduce the effects of lag in an image transducer. The retrace beam is defocussed to provide large area, uniform stripping action. After the read-out beam has traced across the photocathode of the image transducer, the active retrace beam is vertically stepped back to an earlier point in the raster field and retrace is initiated. After the active retrace scan, the beam is vertically stepped down to a point one line below the previously read-out scan line and the read-out scan is initiated. A fairly large area of the photocathode receives several overlapping erasure scans by the defocused, active retrace beam each time a field is scanned. Uniform erasure results. Very little time is required, so the invention may be utilized in system demanding minimal retrace times.