Cathode ray tube having radially directed commutator elements

Abstract

Abstract A focused electron beam is circularly deflected. It is directed at a commutator target and passes through a positive collector mesh. The target comprises a plurality of separate, conductive spokes. Alternate spokes are connected together and serve as a shield electrode, which is held slightly positive with respect to the cathode. The remaining alternating spokes are grouped with three to five of the spokes being connected together to form an input channel. Input channel level ranges are typically from - 5 volts to zero, so that when a group is more negative, the electron beam is prevented from landing on the shield electrode, and is returned to the collector grid or mesh. When an input is near zero volts, a large percentage of the electron beam lands on the shield electrode. Thus, between these values, electron beam current returning to the collector mesh is modulated by the input signal levels applied to the various spoke groups. In this manner the voltage levels on the different sets of input spokes are commutated as the electron beam is circularly deflected. The commutated signal can be read as collector mesh current.

Inventors

• 👤 Elvin E Herman

Bibliographic Details