发明名称 |
CRT With internal thermionic valve for high voltage control |
摘要 |
The magnitude of a DC high voltage supplied to an internal element of a CRT is varied by a thermionic valve that is located within the envelope of the CRT and that forms a voltage divider with an external load resistor. Only a small scale signal referenced near ground is needed to produce a several thousand volt change in the high voltage supplied to the internal CRT element. The variable high voltage may control a variable deflection factor, variable spot size, or in the case of a beam penetration CRT, either variable persistence or variable trace color. In a particular beam penetration color CRT having a split anode the thermionic valve comprises a tetrode flood gun coupled by an electron mirror to a plate region in the neck of the CRT.
|
申请公布号 |
US4450387(A) |
申请公布日期 |
1984.05.22 |
申请号 |
US19810248925 |
申请日期 |
1981.03.30 |
申请人 |
HEWLETT-PACKARD COMPANY |
发明人 |
REED, RONALD G.;SCHMUCKAL, ROBIN R.;MCCULLOUGH, ROBERT K. |
分类号 |
H01J29/26;H01J29/48;H01J29/80;H01J29/96;H01J31/20;(IPC1-7):H01J29/80 |
主分类号 |
H01J29/26 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|