US 4,071,932 AGranted

Method of making electron guns for cathode ray tubes and the like

OwnerAdrian W. Standaart, deceased, by Josephine B. Standaart, administratrixinventors

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Abstract

A method of processing elements of an electron gun assembly for electron beam tubes and the like, wherein the electron gun assembly in completed form includes a cathode and at least a control grid and first anode rigidly assembled together, the control grid and first anode each comprising a substrate having a substrate aperture therethrough and a flat face substantially perpendicular to the electron beam to be formed covered with a thin layer of metal at least adjacent the substrate aperture having a shaped beam-controlling aperture therethrough. The control grid and first anode substrates are processed to preform the substrate apertures therein, the flat metal layers are formed on a flat face of the substrates spanning the substrate apertures, these substrates and the cathode are mounted as a rigid skeleton subassembly on a laser bench, and a laser beam is directed onto portions of the metal layer spanning the substrate apertures to form the beam control apertures therein.

Claims20

Dependent claims

The method of processing elements of an electron gun assembly for cathode ray tubes and the like to provide precision-shaped, sized, and aligned beam-control apertures in elements thereof, the electron gun assembly in completed form including a cathode, control grid, first anode, focus anode, and accelerating anode elements rigidly assembled in predetermined alignment along a longitudinal reference axis paralleling the axis of one or more electron beams to be generated, shaped, controlled, focused and accelerated thereby and the control grid and first anode elements each comprising a substrate having a substrate aperture therethrough for each electron beam to be formed and including a flat face substantially perpendicular to the beam axis covered with a thin layer of metal overlying at least the portions of said flat face immediately adjacent each said substrate aperture and having a beam-controlling aperture through said layer at each said substrate aperture, comprising the steps of:

a. preforming the substrate aperture in substrates shaped to form said control grid and first anode as oversized apertures relative to the beam-control apertures to be formed in their associated metal layers,
b. forming the metal layers on said substrates as flat metal layers of uniform thickness extending over predetermined areas of a flat face portion of each substrate and uninterruptedly spanning the preformed substrate apertures without any beam-control apertures therein,
c. assembling such substrates of step (b) for a control grid and first anode on a supporting frame member of the electron gun assembly together with focus anode and accelerating anode elements and without any cathode element assembled therewith to form a skeleton subassembly,
d. mounting the electron gun skeleton subassembly of step (c) on a laser bench assembly having a laser beam source and means for adjusting the position of the electron gun skeleton subassembly with respect to the laser beam two-dimensionally in a plane perpendicular to the laser beam axis and lengthwise along the bench assembly,
e. focusing the laser beam in the metal layer zones spanning the substrate apertures of the control grid and first anode substrates of said skeleton subassembly and directing the laser beam along a predetermined axis to strike such metal layer zones and concurrently form beam-control apertures of desired size, shape and alignment in said layer zones, and
f. assembling the cathode thereon to form the completed electron gun assembly.

3 more elements

The method of processing elements of an electron gun assembly for electron beam tubes such as cathode ray tubes and similar devices to provide precision-shaped, sized, and aligned beam-control apertures in elements thereof, the electron gun assembly in completed form including at least a cathode, control grid and first anode rigidly assembled in predetermined alignment along a longitudinal reference axis paralleling the axis of one or more electron beams to be generated, shaped, controlled, focused and accelerated thereby and the control grid and first anode elements each comprising a substrate having a substrate aperture therethrough for each electron beam to be formed and including a flat face substantially perpendicular to the beam axis covered with a thin layer of metal overlying at least the portions of said flat face immediately adjacent each said substrate aperture and having a beam-controlling aperture through said layer at each said substrate aperture, comprising the steps of:

a. preforming the substrate apertures in substrates shaped to form said control grid and first anode as oversized apertures relative to the beam-control apertures to be formed in their associated metal layers,
b. forming the metal layers on said substrates as flat metal layers of uniform thickness extending over predetermined areas of a flat face portion of each substrate and uninterruptedly spanning the preformed substrate apertures without any beam-control apertures therein,
c. assembling such substrates of step (b) for a control grid and first anode on a supporting frame member of the electron gun assembly without any cathode element assembled therewith to form a skeleton subassembly,
d. mounting the electron gun skeleton subassembly of step (c) on a laser bench assembly having a laser beam source and means for adjusting the position of the electron gun skeleton subassembly with respect to the laser beam two-dimensionally in a plane perpendicular to the laser beam axis and lengthwise along the bench assembly,
e. focusing the laser beam in the metal layer zones spanning the substrate apertures of the control grid and first anode substrates of said skeleton subassembly and directing the laser beam along a predetermined axis to strike such metal layer zones and concurrently form beam-control apertures of desired size, shape and alignment in said layer zones, and
f. assembling the cathode thereon to form the completed electron gun assembly.

3 more elements

Dependencies are inferred from the claim text.