Title:
METHOD AND DEVICE FOR COMPENSATING ALTERNATE ELECTRIC FIELD PRODUCED ON FRONT SURFACE OF CATHODE RAY TUBE
Document Type and Number:
Japanese Patent JPH05242821
Kind Code:
A
Abstract:
PURPOSE: To compensate simply and effectively alternate electric field generated on a front surface of a cathode ray picture tube by sensing an AC voltage between a high voltage generator and an EHT high voltage terminal and applying it to an outside electrode positioned close to a picture tube after reversal amplifying. CONSTITUTION: A cathode ray picture tube 1 has a high voltage terminal 10 as an EHT terminal and derives an internal alternate voltage signal. While the terminal 10 is connected to a grounded voltage generator 2 by a connecting wire 5 it is connected from a tap to a grounded reversal type amplifier 3 through a capacitor 4. An output of the amplifier 3 is coupled with a ring electrode 12 surrounding periphery of a picture range on the front surface 11 of the picture tube 1. Thereby, a high frequency electric field generated by a high frequency part of the alternate voltage signal obtained from the connecting wire 5 can be compensated through the outside electrode 12 surrounding the front surface of the picture tube.
Inventors:
TOORU MEEN
Application Number:
JP18068692A
Publication Date:
September 21, 1993
Filing Date:
July 08, 1992
Export Citation:
Assignee:
TANDBERG DATA
International Classes:
H01J29/00; H01J29/88; H01J29/98; H01J29/02; H04N9/29; (IPC1-7): H01J29/02; H01J29/88
Domestic Patent References:
| JPS60218693A | 1985-11-01 | |||
| JP61081269B | ||||
| JP63085974B |
Attorney, Agent or Firm:
Toshio Yano (2 outside)