Field-sequential color television apparatus employing color filter wheel and two camera tubes

Claim 2

Apparatus for generating a three-color, field-sequential television signal of an optical image comprising: optical color filter means comprising an ordered series of adjoining color filter segments in each of three primary colors for color filtering said optical image; first and second television camera tubes for developing video signals spatially arranged such that each tube is simultaneously exposed to a different color filtered optical image; means for impelling said series of color filter segments such that the colors of said color filtered images on the faces of said tubes change at a predetermined rate; means for alternately scanning each of said camera tubes in a time fractionally related to the time any point on the face of said tube is exposed to a color filtered image of a particular color; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 3

The apparatus of claim 1 wherein said color filter means comprises an ordered series of adjoining color filter segments arranged around the periphery of a filter wheel.

Claim 4

The apparatus of claim 1 wherein said color filter means comprises an ordered series of adjoining color filter segments arranged longitudinally on a closed loop filmstrip.

Claim 5

The apparatus of claim 1 wherein said color filter means comprises an ordered series of adjoining color filter segments arranged about the cylindrical surface of a drum.

Claim 6

Apparatus for generating a three-color, field-sequential television signal of an optical image comprising;: color filter means for color-filtering said optical image; first and second television camera tubes for developing video signals spatially positioned such that each tube is simultaneously exposed to a different color-filtered optical image transmitted by said color filter means; means for altering the colors of said tubes at a predetermined rate; means for alternately scanning each of said camera tubes; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 7

Apparatus for generating a three-color, field-sequential television signal of an optical image comprising;: color filter means for color-filtering said optical image; first and second television camera tubes for developing video signals spatially positioned such that each tube is simultaneously exposed to a different color-filtered optical image transmitted by said color filter means; means for altering the colors of said tubes at a predetermined rate; means for alternately scanning each of said camera tubes; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 8

Apparatus for generating a three-color, field-sequential television signal of an optical image comprising: color filter means comprising a plurality of adjacent color filter segments in each of three primary colors for color filtering said optical image; first and second television camera tubes for developing video signals spatially arranged such that each tube is simultaneously exposed to a different color filtered optical image; means for impelling said series of color filter segments such that the colors of said color-filtered images focused on the faces of said tubes change at a predetermined rate; means for alternately scanning each of said camera tubes in a time fractionally related to the time any point on the face of said tube is exposed to a color-filtered image of a particular color, the scanning of each of said tubes synchronized to begin when an interface between two of said color filter segments is coinCident with the portion of said optical image focused on the part of the face of said tube first to be scanned and further synchronized to end when said interface is coincident with the portion of said optical image focused on the part of said tube last to be scanned; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 9

Apparatus for generating a three-color, field-sequential television signal of an optical image comprising: color filter means comprising a plurality of adjacent color filter segments in each of three primary colors for color filtering said optical image; first and second television camera tubes for developing video signals spatially arranged such that each tube is simultaneously exposed to a different color filtered optical image; means for impelling said series of color filter segments such that the colors of said color-filtered images focused on the faces of said tubes change at a predetermined rate; means for alternately scanning each of said camera tubes in a time fractionally related to the time any point on the face of said tube is exposed to a color-filtered image of a particular color, the scanning of each of said tubes synchronized to begin when an interface between two of said color filter segments is coinCident with the portion of said optical image focused on the part of the face of said tube first to be scanned and further synchronized to end when said interface is coincident with the portion of said optical image focused on the part of said tube last to be scanned; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 10

Apparatus for generating a three-color, field-sequential signal of an optical image comprising: first and second monochrome television camera tubes for developing video signals; means for focusing said optical image on the faces of said tubes; color filter means comprising an ordered series of adjoining color filter segments in each of three primary colors situated between said focusing means and said camera tubes for color filtering said optical images focused on the faces of said camera tubes; means for imparting motion to said series of color filter segments such that the colors of said color optical images change with time; means for alternately scanning said camera tubes; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 11

Apparatus for generating a three-color, field-sequential signal of an optical image comprising: first and second monochrome television camera tubes for developing video signals; means for focusing said optical image on the faces of said tubes; color filter means comprising an ordered series of adjoining color filter segments in each of three primary colors situated between said focusing means and said camera tubes for color filtering said optical images focused on the faces of said camera tubes; means for imparting motion to said series of color filter segments such that the colors of said color optical images change with time; means for alternately scanning said camera tubes; and means for selectively combining video signals developed by said camera tubes to generate said three-color, field-sequential video signal.

Claim 12

The apparatus defined in claim 7 wherein the dimension of each of said color filter segments measured between its interfaces with adjoining filter segments is twice the vertical dimension of said optical image measured in the plane of the intersection of said color filter segments and said optical image.

Claim 13

The apparatus defined in claim 8 wherein said motion is such that an interface between two of said color filter segments passes through one of said optical images in the time required to scan one of said tubes.

Claim 14

The apparatus defined in claim 9 wherein said camera tubes are arranged so that the images focused on their faces are filtered through the opposite extremes of two adjacent filter segments.

Claim 15

The apparatus defined in claim 10 wherein the scanning of each of said tubes is synchronized to begin when an interface between two of said color filter segments is coincident with the portion of the optical image focused on the part of said tube first to be scanned.