Resources Contact Us Home
Color cathode ray tube display apparatus with compensation for errors due to interfering magnetic fields

Image Number 2 for United States Patent #4410840.

A color cathode ray tube display apparatus is provided with compensation for errors due to interfering magnetic fields in which a deflection yoke causes the electron beams to raster scan across the tube, a convergence assembly on the neck of the cathode ray tube adjusting the beam convergence. Errors in the waveforms suppied to the radial convergence assembly are caused by high frequency magnetic field coupling between the yoke and the convergence assembly via the internal magnetic structure 7 of the cathode ray tube. A compensating coil 11, placed adjacent the convergence coil unit 12, 16 supplies compensating current through resistor 20 to the amplifier 15 driving the convergence coil unit, thus avoiding a fringe on the left-hand side of the screen. Alternatively, compensating current can be derived from the line flyback pulse or the logic signal initiating line flyback.

  Recently Added Patents
Semiconductor devices having multi-width isolation layer structures
Candle holder
Configurable pitch reducing optical fiber array
Tri-material dual-species neutron spectrometer
Implantable defibrillator systems and methods with mitigations for saturation avoidance and accommodation
Method for transmitting a signal from a transmitter to a receiver in a power line communication network, transmitter, receiver, power line communication modem and power line communication syst
Probiotic Bifidobacterium strains
  Randomly Featured Patents
Apparatus and methods for producing and using high-density cells and products therefrom
2-(4-azolylbutyl)-1-piperazinyl)-5-hydroxy-pyrimidine derivatives, their preparation and their application as medicinal products
Headlights for a vehicle
Wireless children's safety light in a security system
Apparatus for vulcanizing pneumatic tires
Rear holder-attached connector and method of producing the same
Method of manufacturing a semiconductor device, in which a negative image is formed on a semiconductor substrate in a positive photolacquer
Multifunction container, particularly for ski boots, ice skates or roller skates of the single wheel type
Stored-energy operating means for an electric circuit breaker