Lag reduction in image transducers having dynamically shaped ras

Details Lag reduction in image transducers having dynamically shaped ras Lag reduction in image transducers having dynamically shaped ras

1977-04-12

1978-06-27

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 534

Patent

active

040979016

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.

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