Abstract A colour selection electrode having a plurality of parallel stripe shaped perforations which are divided into a plurality of slit-shaped sections by means of transverse bridges used in a colour picture tube provided with a fluorescent screen having a plurality of stripe shaped phosphors is manufactured by preparing a first pattern member formed with a plurality of parallel stripe shaped light transmitting portions extending in a first direction, the width of the light transmitting portions gradually decreasing from the center toward the opposite ends, a second pattern member formed with a plurality of parallel stripe shaped light transmitting portions extending in a second direction which is different from the first direction, and a third pattern member formed with a plurality of parallel light intercepting portions extending in a third direction which is different from the first and second directions. The second and third pattern members are combined to form a fourth pattern member having a plurality of discontinuous light intercepting portions. Then the first and fourth pattern members are combined to prepare a reference pattern member having a plurality of parallel stripe shaped light transmitting portions which are divided into a plurality of slit shaped sections by means of staggered light intercepting bridges. The colour selection electrode is prepared by using the reference pattern member.
A method of manufacturing a colour selection electrode having a plurality of stripe shaped perforations and used in a colour picture tube provided with a fluorescent screen having a plurality of stripe shaped phosphors, said method comprising the steps of preparing a first pattern member formed with a plurality of parallel stripe shaped light transmitting portions extending in a first direction, the width of said light transmitting portions gradually decreasing from the center toward the opposite ends, a second pattern member formed with a plurality of parallel stripe shaped light transmitting portions extending in a second direction which is different from said first direction, and a third pattern member formed with a plurality of parallel light intercepting portions extending in a third direction which is different from said first and second directions; preparing a fourth pattern member formed with a plurality of discontinuous light intercepting portions which are formed by using a combination of said second and third pattern members; combining said first and fourth pattern members for preparing a reference pattern member formed with a plurality of parallel stripe shaped light transmitting portions which are divided into a plurality of slit shaped sections by means of a plurality of staggered light intercepting bridges; and forming said colour selection electrode provided with a plurality of parallel stripe shaped perforations by using said reference pattern member, the width of each stripe shaped perforation gradually decreasing from the center toward the opposite ends, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of transverse bridges, the bridges in adjacent perforations being staggered in the direction thereof.
Claim 2
Independent Claim
270 words
A method of manufacturing a colour selection electrode having a plurality of stripe shaped perforations and used in a colour picture tube provided with a fluorescent screen having a plurality of stripe shaped phosphors, said method comprising the steps of preparing a first pattern member formed with a plurality of parallel stripe shaped light transmitting portions extending in a first direction, the width of said light transmitting portions gradually decreasing from the center toward the opposite ends, a second pattern member formed with a plurality of parallel stripe shaped light transmitting portions extending in a second direction which is different from said first direction, and a third pattern member formed with a plurality of parallel light intercepting portions extending in a third direction which is different from said first and second directions; preparing a fourth pattern member formed with a plurality of discontinuous light intercepting portions which are formed by using a combination of said second and third pattern members; combining said first and fourth pattern members for preparing a reference pattern member formed with a plurality of parallel stripe shaped light transmitting portions which are divided into a plurality of slit shaped sections by means of a plurality of staggered light intercepting bridges; and forming said colour selection electrode provided with a plurality of parallel stripe shaped perforations by using said reference pattern member, the width of each stripe shaped perforation gradually decreasing from the center toward the opposite ends, each stripe shaped perforation being divided into a plurality of slit shaped sections by means of transverse bridges, the bridges in adjacent perforations being staggered in the direction thereof.
Claim 3
Dependent Claim
37 words
The method according to claim 1 wherein the stripe shaped light transmitting portions of said first pattern member and the stripe shaped light transmitting portions of said second pattern member intersect with each other at right angles.
Claim 4
Dependent Claim
37 words
The method according to claim 1 wherein the light intercepting portions of said third pattern member and the stripe shaped light transmitting portions of said second pattern member intersect with each other at an angle of 45*.
Claim 5
Dependent Claim
39 words
The method according to claim 1 wherein the discontinuous light intercepting portions of said fourth pattern member are disposed in a plurality of parallel rows, and each of said discontinuous light intercepting portions has a shape of a diamond.
Claim 6
Dependent Claim
33 words
The method according to claim 1 wherein the width of each of said parallel striped shaped light transmitting portions of said second pattern member decreases gradually from the center toward the opposite ends.