Cathode ray tube display apparatus with rotatable raster

Details Cathode ray tube display apparatus with rotatable raster Cathode ray tube display apparatus with rotatable raster

1995-03-22

1997-07-01

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

348583, 345126, H01J 2978

Patent

active

056441975

ABSTRACT:
Cathode ray tube display apparatus includes a cathode ray tube having a screen (210) and a neck (350). In use an electron beam is directed from the neck (350) towards the screen (210) along an axis (S) of the cathode ray tube containing the centre of the screen (210). However, deflection means (320) mounted on the neck (350) deflects the beam from the axis (S) at a deflection centre (X) of the cathode ray tube to scan the beam across the screen (210) in a raster pattern. Raster rotation means (300, 310) permits rotation of the raster pattern about the centre of the screen (210). The raster rotation means (300, 310) includes first and second coils. The first coil (300) is located around the neck (350) at or near the deflection centre (X) to generate, in use, a first magnetic field in the path of the electron beam. The second coil (310) is parallel to the first coil (300) and located around the neck (350) on the side of the deflection centre (X) remote from the screen (210) to generate, in use, a second magnetic field, of opposite polarity to the first field, in the path of the electron beam.

REFERENCES:
patent: 2646529 (1953-07-01), Werenfels et al.
patent: 3098943 (1963-07-01), Reiches
patent: 3772677 (1973-11-01), Sommer

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