Picture recording apparatus having means to facilitate raster scan line observation during video adjustment

Claim 1

A picture recording apparatus having means for reproducing a video image on a display screen of a television monitor in response to image signals, and means for projecting the reproduced video signal onto a recording medium, the improvement wherein: said means for reproducing a video image comprises: raster scanning means for producing raster scanning signals to be applied to electron beam deflection coils of said television monitor, such that said reproduced video image is composed of a plurality of raster scan lines; said raster scanning lines being selectable in an image reproduction mode wherein adjacent raster scan lines of said reproduced image are substantially indiscriminate from one another in a visual sense; and, said raster scanning means also being selectable in a video adjustment mode such that a portion of said reproduced video image is displayed on said television monitor having increased spacing between adjacent raster scan lines in comparison to the spacing between adjacent raster scan lines when said raster scanning means is selected in said image reproduction mode, said increased spacing being to facilitate visual observation of discrete raster scan lines during video adjustment; wherein said raster scanning means comprises: amplifier means having an input terminal and an output terminal; first feedback means comprising a first resistor connected in series between said input terminal and said output terminal; and second feedback means comprising a second resistor and switch means connected in series between said input terminal and said output terminal, wherein said switch means, selected to a short circuit mode for a feedback path comprised of a parallel combination of said first and second resistors, represents said raster scanning means selected in an image reproduction mode, and wherein said switch means, selected to an open circuit mode for a feedback path comprised of a series connection of the first resistor only, represents said raster scanning means selected in a video adjustment mode.