Color television with control of a wobbling beam

Claim 2

Color television apparatus comprising: a surface having an image area on which an image is formed, periodically repetitive groups of horizontally oriented color stripes positioned within the image area, a plurality of sensors located on the surface in one sensing zone, the one sensing zone being adjacent to but exclusive of the image area, all of the plurality of sensors in the one sensing zone being located in a single vertical column and positioned such that for each group of stripes two sensors constitute a pair of sensors associated with said each group, the pair of sensors in the one sensing zone associated with each group being disposed symmetrically with respect to an extension of the horizontal centerlIne of said each group, means for producing an electron beam, deflection means for causing said beam to scan the surface horizontally with periodic vertical variations during each horizontal trace so that the beam repetitively impinges all of the stripes of a group and the associated pair of sensors in the one sensing zone during each horizontal trace, means for producing an index signal in response to the impingement of the beam upon each sensor, and means for controlling said deflection means by utilizing the index signals from the sensors to essentially center the horizontal trace upon the extended centerline.

Claim 3

Color television apparatus as claimed in claim 1 wherein said plurality of sensors are each formed of conductive material and generate an index current when impinged upon by an electron beam.

Claim 4

Color television apparatus as claimed in claim 2 wherein each of said groups is a triad of three color stripes, one sensor of each pair of sensors is associated with the upper half of a triad, is located in the one sensing zone above the extended centerline of that triad and is interconnected by a first common lead to all other of said one sensors associated with the upper half of a triad, a second sensor of each pair of sensors is associated with the lower half of a triad, is located in the one sensing zone below the extended centerline of that triad and is interconnected by a second common lead to all other of said second sensors associated with the lower half of a triad, and said means for controlling said deflection means includes differential circuit means having two inputs for producing a control signal indicative of the difference between the signals applied to the two inputs, said first common lead being applied to one input and said second common lead being applied to the other input, and said control signal being applied to the deflection means.

Claim 5

Color television apparatus as claimed in claim 1 wherein said horizontal trace extends from one side of the surface to the other side of the surface, said one sensing zone being located on said one side of the surface, said apparatus further comprising a second plurality of sensors located on the surface in a second sensing zone, the second sensing zone being adjacent to but exclusive of the image area and being located on the other side of the surface, said second plurality of sensors being located in a single vertical column in the second sensing zone and positioned such that for each group two sensors constitute a pair of sensors associated with that group, the pair of sensors in the second sensing zone associated with each group being disposed symmetrically with respect to an extension of the horizontal centerline of said group, said controlling means producing a dc signal from the index signals produced by the impingement of the beam upon the sensors in one sensing zone on the one side of the surface to vertically shift the position of the beam at the one side, and said controlling means producing a ramp signal from the index signals produced by the impingement of the beam upon the sensors in the second sensing zone on the other side of the surface to modify the tilt of the beam trace from the one side to the other side.

Claim 6

Color television apparatus as claimed in claim 1 wherein said surface is a target and said horizontally positioned color stripes are focused segments of colored light formed by a striped optical filter.

Claim 7

Color television apparatus as claimed in claim 1 wherein said surface is a viewing surface and said horizontally positioned color stripes are phosphor stripes, each emanating a distinctive light when bombarded by electrons.