US 4,301,389 AGranted

Multiple beam cathode ray tube with apertured cathode and control grid

AssigneeInternational Business Machines Corporation

InventorsVernon D. Beck, Bruce P. Piggin, Arthur E. Uber, III

Life of this patent

Estimating the term…

Loading patent…

Abstract

A multiple beam cathode ray tube having an improved cathode-grid structure which facilitates grid lead connections and mounting. The cathode means has a plurality of openings which are arranged in an array pattern which is identical to the desired electron beam array pattern, and has an emitter means associated with each opening for emitting a group of electrons. The grid means is located behind instead of in front of the cathode means and is comprised of a plurality of grid elements mounted on a substrate. When appropriately biased, the grid elements cause groups of electrons which are emitted by the respective emitter means to flow through the corresponding openings in the cathode in the direction of the screen, thus establishing the required electron beams.

Claims14

Dependent claims

A multiple beam cathode ray tube wherein a plurality of electron beams form an image on the screen of the tube, and having a cathode-grid structure which substantially reduces grid mounting and grid lead-connection problems, comprising,

a cathode ray tube envelope having a screen disposed at one end thereof,
cathode means disposed in said cathode ray tube envelope near the other end thereof for emitting a plurality of physically separated groups of electrons,
said cathode means having a plurality of openings therein wherein each opening corresponds to a said group of electrons, and
grid means disposed in said envelope between said cathode means and said other end of said cathode ray tube envelope for directing each group of electrons which is emitted, through the opening which corresponds thereto in the direction of said screen, for establishing said plurality of beams which form said image.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/102,794Filed 12 Dec 1979
Granted: 17 Nov 1981
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H01J 29/50
Electron guns: two or more guns in a single vacuum space, e.g. for plural-ray tube
H01J 29/04
Electrodes; Screens; Mounting, supporting, spacing or insulating thereof: cathodes
H01J 29/82
Arrangements of electrodes and associated parts for generating or controlling the ray or beam, e.g. electron-optical arrangement: mounting,…
H01J 31/128
With luminescent screen: provided with control means permitting the electron beam to reach selected parts of the screen, e.g. digitally controlled…