Integratable CRT spot cut-off network
US4390817A · kind A · utility
9Cited by
1References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 27, 1981 |
| Grant date | Jun 28, 1983 |
| Priority date | — |
| Expiry date | Feb 27, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N3/24
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An integratable CRT spot cut-off network is described for use in a television receiver. The network establishes a reference current for biasing up the receiver's G.sub.1 grid when the supply voltage comes up, and a bypass capacitor coupled to the grid charges toward the supply voltage. When the receiver is turned off, the network terminates the reference current as the supply voltage starts to collapse and prevents the bypass capacitor from discharging. The charge stored on the capacitor reverse biases the grid to cut off the receiver's beam current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.