TH22889A - Color cathode ray tubes And how to produce a shadow mask " - Google Patents

Abstract

Color cathode ray tube with front panel Phosphor-formed screen On the inner surface of the front panel Electron gun for releasing an electron beam to Phosphor screen And a shadow mask (26) placed between the electron guns. And the front panel opposite the phosphor screen The shadow mask has a large electron beam (12) where the electron beam passes. Each has a small opening (40) that opens onto one of the surface of the shadow mask. And the large opening (42) opens to the second surface of the shadow mask and connects to the small opening. The large opening has a central core (42C) and a larger diameter than the diameter of the opening (42) of each electron beam cavity, which is located on the surrounding part of the shadow mask, including the convex portion (42a). On the opposite side of the center of the mask relative to the central axis of the large opening And embossed Outside in the radial direction

Claims (5)

1. A colored cathode ray tube consists of a front panel with a phosphor screen formed on its inner surface. Electron gun That is placed opposite the phosphor screen for electrolyte discharge Tron to a phosphor screen and a shadow mask positioned between the electron guns. And the front panel opposite the phosphor screen and has a large number of electron beam holes Which is formed almost entirely on the shadow mask And where the electron beam passes, there is a shadow mask that includes One surface opposite the electron gun Second skin That is opposite to the phosphor screen And the center of the center face that is aligned with the axis Tube of cathode ray tubes An electron beam With a slit opening Opening to one surface of the shadow mask and a large opening It opens to the second surface of the shadow mask and connects to the large opening. Large opening with a central core And the diameter is larger than the line Cut off the center of the small opening where the shadow mask's wall surface is located. Which defines the large opening of the trunk compartment Each electron channel arranged at the surrounding part of the shadow mask. Including the convex part Which is arranged on The opposite side of the center of the mask Compared to the core of a large opening And which are convex outward in the radial direction 2.Colored cathode ray tube according to claim 1, where the convex protrudes from the central part on the large opening defining the surface of the wall. Of the shadow mask To the open edge of a large opening Arranged on the side of the second surface Of the shadow mask And the middle part Are arranged between the connection of the large opening and the small opening. And the opening edge of a large opening 3.Colored cathode ray tubes according to claim 2, where the convex portion is wide in a relatively perpendicular to the radial direction. Relative to the center of the mask Quite equal to Or larger than the diameter of The connection of a large opening with a small opening. 4.Colored cathode ray tubes according to claim 1, where the large openings, except the convex ones, are arranged co-axially with the smaller ones. 5.The colored cathode ray tube consists of a front panel with a phosphor screen. That is formed on the inner surface of it Electron gun That is placed opposite the phosphor screen for electrolyte discharge Tron goes to the phosphor screen and the shadow mask that is placed between the panels. And the electron gun, opposite the phosphor screen, and has many electron channels. Which is formed almost entirely and where the beam of electrons passes, there is a shadow mask that includes one surface Opposite of the second surface electron gun, opposite the phosphor screen. And the center of the mask is aligned with Tube core of cathode ray tube Each electron beam cavity That includes a small opening to the surface One of the shadow masks And the large opening opens to the second surface of the shadow mask and connects to the small opening. And large diameter Than the diameter of the small opening Where the surface in front of the wall of the shadow mask Which defines the large opening of the opening The individual electron beams arranged around the shadow mask. This includes the annular convex protrusion that extends from the central part to the opening edge of the large opening. Arranged on the side of the surface Two of the shadow masks And will be convex outward In the radial direction of such large and central openings Are held between the connection sections of large openings. With a small opening And the opening edge of a large opening on the side of the second surface of the shadow mask.