Synchronization for oscillating optical beam deflecting device

Details Synchronization for oscillating optical beam deflecting device Synchronization for oscillating optical beam deflecting device

1977-06-28

1978-10-24

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358230, 358231, 358264, 358293, H04N 124, H04N 308

Patent

active

041224949

ABSTRACT:
A display system includes an oscillating mirror for deflecting modulated optical energy. The system includes apparatus for indicating when the mirror has reached its travel end point in both directions. Images are written during mirror travel in one direction between said end points, and synchronizing apparatus is provided to allow an image to be written during mirror travel in a direction opposite said one direction in such a fashion that the images written during both directions of mirror travel are superimposed on each other. Apparatus is provided to measure the time elapsed between cessation of writing during mirror travel in one direction, and the time the mirror reaches the end point of its travel in that direction. A second time period is measured out, beginning from the time the mirror reaches its travel end point, and production of modulated optical energy is allowed to proceed at the completion of the second time period which is made equal to the measured first time period. Digital and analog embodiments are disclosed.

REFERENCES:
patent: 3090828 (1963-05-01), Bain
patent: 3835249 (1974-09-01), Dattilo
patent: 4037231 (1977-07-01), Broyles
patent: 4047792 (1977-09-01), Dale

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