Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1987-09-30
1989-10-24
Tarcza, Thomas H.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
364521, 340727, H01J 2952, G06F 15626, G09G 106
Patent
active
048764884
ABSTRACT:
A system for rotating images on a raster display device through an angle includes a tilt angle signal, first and second tilt angle sine function modulators and first and second tilt angle cosine function modulators. The horizontal deflection circuit of the display device is driven by a ramp signal which is the sum of the horizontal sweep generator output multiplied by the second cosine function modulator plus the vertical sweep generator output multiplied by the second sine function modulator. Similarly, the vertical deflection circuit of the display unit is driven by a ramp signal which is the sum of the vertical sweep generator output multiplied by the first cosine function modulator plus the horizontal sweep generator output multiplied by the first sine function modulator. Variation of the tilt angle signal varies the sine and cosine functions and produces a corresponding rotation of the display image.
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Issing Gregory C.
Tarcza Thomas H.
The Boeing Company
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