公开(公告)号：JPH1050200A

公开(公告)日：1998-02-20

申请号：JP12395997

申请日：1997-05-14

Applicant: IBM

Inventor： JIYON BIITESON ,  ANDORUU RAMUZEI NOTSUKUSU

IPC: H01J29/02 ,  H01J1/00 ,  H01J7/44 ,  H01J19/82 ,  H01J29/68 ,  H01J29/98 ,  H01J31/12 ,  H01J37/24 ,  H01J61/56

Abstract: PROBLEM TO BE SOLVED: To provide a vacuum electronic apparatus which can controllably measure electron beam flow by arranging a sensor electrode between a cathode which supplies electrons of electron beam and an anode which receives electrons and housing the resultant body in a vacuum tube. SOLUTION: A vacuum tube 10 houses an anode 30, a cathode 20, and a conductive plate 40. During operation, the anode 30 is held at higher or equal potential than the cathode 20 and electrons emitted out of the cathode 20 pass the tube 10 toward the anode 30. The conductive plate 40 is connected to a detection circuit 50 arranged in the inside or the outside of the apparatus. Due to electrons which collide against the conductive plate 40 during the operation, electric current flowing from the circuit 50 to the conductive plate 40 is generated. By controlling the potential of the conductive plate 40 to be the necessary potential to balance an electrostatic field, the disturbance to the electrostatic field in the peripheral area of the conductive plate 40 is suppressed to the minimum limit. Consequently, electron beam flow between the anode 30 and the cathode 20 can be measured.

公开(公告)号：JPH06103923A

公开(公告)日：1994-04-15

申请号：JP22951291

申请日：1991-08-15

Applicant: IBM

Inventor： KENESU JIYOOJI SUMISU ,  JIYON BIITESON

IPC: H01J29/76 ,  H01J29/00 ,  H04N9/29

Abstract: PURPOSE: To provide a display to reduce ECMF magnetic field radiated from a cathode-ray tube display. CONSTITUTION: This display comprises a pair of primary canceling coils that produce a primary canceling magnetic field having a tendency to cancel a first straying field generated by a pair of primary deflection coils, and a pair of secondary canceling coils 50, 32 that produce secondary canceling magnetic field having a tendency to cancel a second straying field generated by secondary deflection coils. The secondary canceling coils 50, 32 are positioned symmetrically about the longitudinal axis of a cathode-ray tube 1 by means of supporting bodies 51, 52 in such a manner that a plane including that of the secondary canceling coils is perpendicular to any plane including the primary coils.