Title:
MEASURING METHOD FOR GAS PRESSURE OF CATHODE-RAY TUBE
Document Type and Number:
Japanese Patent JPS63115025
Kind Code:
A
Abstract:
PURPOSE:To measure the gas pressure in a cathode-ray tube while the cathode- ray tube is in operation and to improve the measurement sensitivity by fitting an ion collector for the in-tube gas to a funnel part. CONSTITUTION:The ion collector 33 is fitted on the internal surface of the funnel part 24 across an insulator 34 and the lead wire of the collector 33 is led out of the tube from a sealing part which connects a panel part 18 and the funnel part 24 to each other. Then an electron gun 3 is put in a neck part 2 and a vacuum is produced in the tube. Then, a specific voltage is applied to the electron gun 3 and an electron beam 27 is emitted toward the internal surface of the panel part. Then, a voltage which is lower in level than an anode voltage applied to the anode of the electron gun 3 is applied to the collector 33. Then, the electron beam 27 collides against many gas molecules remaining in the tube to ionize them. Then, + ions ionized by the electron beam 27 are collected by the collector 33 in the area between the anode of the electron gun 3 and the collector 33 and an ion current conducted through the collector 33 is displayed outside the tube.
Inventors:
IMANISHI WATARU
Application Number:
JP26121486A
Publication Date:
May 19, 1988
Filing Date:
October 31, 1986
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
G01L21/30; H01J9/42; H01J41/02; (IPC1-7): G01L21/30; H01J9/42; H01J41/02
Attorney, Agent or Firm:
Masuo Oiwa