Projection cathode ray tube having target angularly and longitudinally adjustable to tube axis

Claim 1

A projection cathode ray tube comprising the combination of a sealed evacuated envelope comprising a tubular portion, a mirror portion sealed to one end of the tubular portion, the mirror portion having an inner concave mirror surface with a first aperture therein, an electron gun container portion sealed to the first aperture, a transparent face plate sealed to the other end of the tubular portion, the face plate having a second aperture therein, and a bellows having one end sealed to the second aperture and being closed at the other end thereof, a target member within the envelope, attached to said other end of the bellows and having a surface with an electron beam sensitive coating thereon, an electron gun within said electron gun container portion in position to direct a beam of electrons on to said coating, said mirror surface being located to reflect light between said coating and said face plate, and means to adjust the target member position relative to the mirror portion including a shaft portion extending through the bellows and having an axis adjustably rotatable relative to said face plate, one end of the shaft portion being engaged with the target member and adapted to impart movements thereto longitudinally of the shaft portion and rotatably relative to said faceplate, a frame portion extending laterally from the other end of the shaft portion exteriorly of the envelope and having reference surface thereon each in engagement with the face plate, and means on the frame portion for independently adjusting the displacement between each of said reference surfaces and the target member.