Browse Prior Art Database

Cathode Ray Tube Color Convergence Assembly

IP.com Disclosure Number: IPCOM000052426D
Original Publication Date: 1981-Jun-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Beeteson, JS: AUTHOR [+5]

Abstract

A radial convergence assembly for a delta gun color cathode ray tube (CRT) is shown in the figure. The assembly consists of a pair of ferrite pole pieces 1. Each ferrite pole piece has a coil 2 which can be energized by AC currents to achieve dynamic convergence. The pole pieces 1 are separated by a magnet 3 and air gap 4. The magnet 3 is rotatable to set the static convergence condition. A spring clamp 5 holds the assembly together.

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Cathode Ray Tube Color Convergence Assembly

A radial convergence assembly for a delta gun color cathode ray tube (CRT) is shown in the figure. The assembly consists of a pair of ferrite pole pieces 1. Each ferrite pole piece has a coil 2 which can be energized by AC currents to achieve dynamic convergence. The pole pieces 1 are separated by a magnet 3 and air gap 4. The magnet 3 is rotatable to set the static convergence condition. A spring clamp 5 holds the assembly together.

The spring clamp 5 is made of a nickel-iron alloy, such as R2800 made by Telcon Metals Limited. In addition to holding the assembly together, clamp 5 is designed to act as a magnetic shunt to give good AC sensitivity to the assembly. Further, the material of the clamp can be selected so that it can compensate for temperature variation in the magnetic permeability of the magnet 3; i.e., temperature variation in the magnetic permeability of the spring clamp 5 is opposite that of the magnet 3.

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