Stripe-shaped color separation filter for image pickup tube and method for manufacturing the same

A color separation filter for use with an image pickup tube comprising (a) a transparent substrate serving as a window of said image pickup tube, (b) a plurality of filter elements provided at predetermined positions on said substrate, said filter elements exhibiting substantial non-transparency with respect to light of at least one color, said filter elements being spaced from one another so as to define openings therebetween, and (c) a layer of a transparent material transparent to substantially all light on said filter elements, said transparent material filling said openings, said layer having a substantially flat surface.

A method for manufacturing a stripe-shaped color separation filter for use with an image pickup tube, comprising providing spaced filter elements at predetermined positions on a transparent substrate, said filter elements having non-transparency relative to selected color lights, and forming a layer of transparent material transparent to substantially all light on and between said filter elements, said layer having a surface flat enough to be practical for use with said image pickup tube, said layer of transparent material being formed by applying said transparent material to said filter elements and said substrate and thereafter smoothing the surface of the layer so formed.

A method for manufacturing a stripe-shaped color separation filter for use with an image pickup tube, comprising providing at predetermined positions on said substrate a first group of spaced filter elements having substantial non-transparency relative to light of a first color, providing a second group of spaced filter elements having substantial nontransparency relative to light of a second color at predetermined positions on said first group of elements in partially superimposed relationship, and forming a layer of transparent material transparent to substantially all light on and between said filter elements, said layer having a surface flat enough to be practical for use with said image pickup tube.

A method for making a color separation filter comprising providing a plurality of filter elements at predetermined positions on a transparent substrate, said filter elements having non-transparency relative to light of at least one color, said filter elements defining therebetween openings, and forming a layer of transparent material transparent to substantially all light on said plurality of filter elements, said transparent material filling said openings and defining a substantially flat surface.

A method for manufacturing a stripe-shaped color separation filter for use with an image pickup tube, comprising providing spaced filter elements at predetermined positions on a transparent substrate, said filter elements having nontransparency relative to selected color lights, and forming a layer of transparent material transparent to substantially all light on and between said filter elements by melting powdered glass, said layer having a surface flat enough to be practical for use with said image pickup tube.

A method for manufacturing a stripe-shaped color separation filter for use with an image pickup tube, comprising providing spaced filter elements at predetermined positions on a transparent substrate, said filter elements having nontransparency relative to selected color lights, and forming a layer of transparent material transparent to substantially all light on and between said filter elements by applying melted glass, said layer having a surface flat enough to be practical for use with said image pickup tube.

A method for manufacturing a stripe-shaped color separation filter for use with an image pickup tube, comprising providing spaced filter elements at predetermined positions on a transparent substrate, said filter elements having non-transparency relative to selected color lights, and forming a layer of transparent material transparent to substantially all light on and between said filter elements, said layer having a surface flat enough to be practical for use with said image pickup tube, said layer being formed by suspending powdered glass in an organic solvent, depositing said powdered glass in the form of a suspension onto said filter elements, removing therefrom the supernatant liquid of suspension and thereafter heating said powdered glass at a temperature of several hundred degrees Centigrade.

A method for manufacturing a stripe-shaped color separation filter for use with an image pickup tube, comprising providing spaced filter elements at predetermined positions on a transparent substrate, said filter elements having non-transparency relative to selected color lights, and forming a layer of transparent material transparent to substantially all light on and between said filter elements, said layer having a surface flat enough to be practical for use with said image pickup tube, said layer being formed by applying on said filter elements a mixture of amyl acetate solvent with powdered glass and a caking agent, removing therefrom said solvent and caking agent at a relatively low temperature, and thereafter heating and melting said powdered glass at a temperature of several hundred degrees Centigrade.