Electric lamp and discharge devices: systems – Cathode ray tube circuits – With radiant energy sensitive control means
Patent
1978-08-18
1980-09-09
Blum, Theodore M.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
With radiant energy sensitive control means
358 51, H01J 3126
Patent
active
042219922
ABSTRACT:
A scanning area rotation device for an image pick-up tube is provided with a focusing coil enclosing the image pick-up tube and a rotation coil surrounding the vicinity of the target face of the image pick-up tube. A first integration value is calculated by integrating a magnetic flux density, which is developed by the focusing coil, distributing from the target face toward an electron gun of the image pick-up tube with respect to a distance along a tube axis of the image pick-up tube. A second integration value is calculated by integrating a magnetic flux density, which is developed by the rotation coil, distributing from the target face toward the electron gun with respect to a distance along the tube axis. In order to rotate the scanning-area on the target face without off-focusing of the electron beams scanned on the target face, current flowing through the rotation coil has a value allowing the ratio of the second to first integration value to be less than 1/100 in absolute value.
Hisamatsu Hiroshi
Takamura Yoshio
Ueda Joji
Asahi Broadcasting Corporation
Blum Theodore M.
Tokyo Shibaura Denki Kabushiki Kaisha
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