Process for making color television masks

Claim 3

The process as specified in claim 1 comprising the further Steps of screening said face panel using a screening master mask having a curved shape substantially corresponding to the curved shape of a shadow mask after forming.

Claim 4

The process according to claim 2 wherein said face panel is provided with mounting means defining three points of support, and wherein the step of forming a mask and support means assembly includes mounting cooperating support means for said mounting means on said first mentioned mask while supporting said cooperating support means and said first mentioned mask in a fixture supporting said first mentioned mask on its outer surface.

Claim 5

The process as described in claim 1 wherein said curved mask surface is a face surface, and wherein the forming of a mask and support means assembly comprises the steps of supporting said mask on said curved face surface in a fixture defining the desired curve, providing a frame member having three support means defining three point support for said frame and referenced with respect to a desired plane, supporting said frame member on said three support means and in proper position with respect to said mask supported in said fixture, and attaching said mask and frame member together when the three support means are properly referenced with respect to the curved face surface of said mask.

Claim 6

The process according to claim 2 including the steps of screening on said panel member a phosphor pattern determined by exposing said panel through a plurality of apertured masters, each master being curved to conform to the curvature of a mask to be used with said panels, one of said masters being used for screening each of a plurality of different color phosphor dots.

Claim 7

The process according to claim 4 wherein said mask is coated with a photo etch resist coating on opposite surfaces thereof after said frame member is attached, and the step of exposing includes the step of supporting said mask on both of said opposite surfaces in die members having apertures therethrough for exposing the opposite surfaces of said mask, said die members being movably supported with respect to each other for movement toward and away from said mask.

Claim 8

A process for manufacturing color television masks and panel assemblies comprising the steps of forming a mask blank from an imperforate wall portion into a desired shape having a curved configuration to form one convex and one concave surface, forming a frame member for supporting said mask blank, attaching mounting members to said frame member with respect to a predetermined reference plane, said mounting members comprising at least three points of support positioned accurately with respect to said plane, providing a fixture for connecting said mask blank and said frame together including checking means supporting said mask blank directly on one curved surface and having at least a plurality of reference contact members engaging said one curved surface in a plurality of separate contact points to insure accuracy of said one curved surface, and supporting said mask blank on said checking means in contact with said reference contact members, providing separate fixedly positioned support means on said fixture, in a predetermined reference relationship to said checking means to receive said mounting members, supporting said mounting members attached to said frame on said separate support means on said fixture, fixing said mask blank and frame together in an assembly while the frame is supported by said mounting members on said separate support means in a precise predetermined reference relationship to the curved surface of said mask blank supported on said checking means, providing a die member having a curved die surface corresponding to at least one of the curved surfaces of said mask blank, said die member having a plurality of apertures opening to said curved die surface, coating said mask blank with a suitable photosensitive etch resist coating, supporting said mask blank closely adjacent said curved die surface with the curved surfaces substanTially in registry, and exposing the coating on said mask blank in predetermined areas to provide areas in which etching can occur to form apertures in said mask blank.

Claim 9

A process for manufacturing color television masks and panel assemblies comprising the steps of forming a mask blank from an imperforate wall portion into a desired shape having a curved configuration to form one convex and one concave surface, forming a frame member for supporting said mask blank, attaching mounting members to said frame member with respect to a predetermined reference plane, said mounting members comprising at least three points of support positioned accurately with respect to said plane, providing a fixture for connecting said mask blank and said frame together including checking means supporting said mask blank directly on one curved surface and having at least a plurality of reference contact members engaging said one curved surface in a plurality of separate contact points to insure accuracy of said one curved surface, and supporting said mask blank on said checking means in contact with said reference contact members, providing separate fixedly positioned support means on said fixture, in a predetermined reference relationship to said checking means to receive said mounting members, supporting said mounting members attached to said frame on said separate support means on said fixture, fixing said mask blank and frame together in an assembly while the frame is supported by said mounting members on said separate support means in a precise predetermined reference relationship to the curved surface of said mask blank supported on said checking means, providing a die member having a curved die surface corresponding to at least one of the curved surfaces of said mask blank, said die member having a plurality of apertures opening to said curved die surface, coating said mask blank with a suitable photosensitive etch resist coating, supporting said mask blank closely adjacent said curved die surface with the curved surfaces substanTially in registry, and exposing the coating on said mask blank in predetermined areas to provide areas in which etching can occur to form apertures in said mask blank.

Claim 10

The process according to claim 7 including the further step of having a pair of movable die members mounted for movement toward and away from each other in a predetermined relationship and position relative to each other, said die members each having a die surface corresponding to the concave and convex surface of said mask blank, respectively, each of said die members having apertures formed therethrough and open to the die surface thereof in a predetermined relationship to the apertures of the other die member, said apertures being arranged in a desired pattern, supporting said mask blank adjacent to the die surfaces of both of said die members, and exposing the photosensitive resist coating on said mask blank when said mask blank is supported adjacent said die surfaces.