Robert Alan McCullough
Engineers at Lelaray St, Colorado Springs, CO
License number
Colorado 69012
Issued Date
Feb 19, 2013
Renew Date
Feb 19, 2013
Type
Engineer Intern
Address
Address
2505 Lelaray St, Colorado Springs, CO 80909
Professional information
Crt With Internal Thermionic Valve For High Voltage Control
US Patent:
4450387, May 22, 1984
Filed:
Mar 30, 1981
Appl. No.:
6/248925
Inventors:
Ronald G. Reed - Colorado Springs CO
Robin R. Schmuckal - Colorado Springs CO
Robert K. McCullough - Colorado Springs CO
Robin R. Schmuckal - Colorado Springs CO
Robert K. McCullough - Colorado Springs CO
Assignee:
Hewlett-Packard Company - Palo Alto CA
International Classification:
H01J 2980
US Classification:
315375
Abstract:
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.