Circuit for stabilizing electron beam focusing of an electromagnetic focusing type camera tube
 A circuit for stabilizing electron beam focusing is used for an electromagnetic focusing type camera tube having a high voltage generating circuit for supplying electrodes of the camera tube. A focusing current is supplied to an electron beam focusing coil of the camera tube. The focusing current supply circuit comprises an operational amplifier having an output terminal to which the focusing coil is connected. A detection resistor is connected between the focusing coil and an inverting input terminal of the operational amplifier. A first resistor is connected between the voltage source and a non-inverting input terminal of the operational amplifier. A second resistor is connected between a reference voltage source and the non-inverting input terminal of the operational amplifier. 
Victor Company of Japan, Limited
H
H04N
inventional
Sumio Shintaro Itsuo Tadayoshi Koichiro Kenichi
Yokokawa Nakagaki Takanashi Miyoshi Motoyama Miyazaki