Cathode ray tube with magnetic beam alignment means

Claim 2

An electron gun comprising: electron beam generating means including an electron emitting cathode and an axially disposed series of electrodes, at least one of which comprises a hollow cylindrical electrode having a substantially electrostatic field-free space therein beam limiting means including an electrode wall element disposed transversely with respect to the cylindrical electrode and having a beam restricting aperture therein; and beam aligning magnetic means including a continuous annular magnetic member coaxially disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetiC field between selected opposing portions of the annular magnetic member and deflecting the beam into alignment with the aperture.

Claim 3

An electron gun comprising: electron beam generating means including an electron emitting cathode and an axially disposed series of electrodes, at least one of which comprises a hollow cylindrical electrode having a substantially electrostatic field-free space therein beam limiting means including an electrode wall element disposed transversely with respect to the cylindrical electrode and having a beam restricting aperture therein; and beam aligning magnetic means including a continuous annular magnetic member coaxially disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetiC field between selected opposing portions of the annular magnetic member and deflecting the beam into alignment with the aperture.

Claim 4

An electron gun comprising: electron beam generating means including an electron emitting cathode and an axially disposed series of electrodes, at least one of which comprises a hollow cylindrical electrode having a substantially electrostatic field-free space therein beam limiting means including an electrode wall element disposed transversely with respect to the cylindrical electrode and having a beam restricting aperture therein; and beam aligning magnetic means including a continuous annular magnetic member coaxially disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetiC field between selected opposing portions of the annular magnetic member and deflecting the beam into alignment with the aperture.

Claim 5

An electron gun as set forth in claim 1 wherein the beam limiting means is supported on the cylindrical electrode in axially spaced operative relationship with the magnetic means.

Claim 6

An electron gun as set forth in claim 2 wherein the magnetic member is spaced a predetermined axial distance from the beam restricting aperture and in the direction of the cathode.

Claim 7

An electron gun comprising: a hollow cylindrical electrode having a substantially electrostatic field-free space therein; an electron emitting cathode operatively disposed adjacent one end of the cylindrical electrode for directing a beam of electrons therein; an electrode wall element disposed transversely with respect to the cylindrical electrode and adjacent the other end thereof, the wall element having a beam restricting aperture therein; and continuous annular magnetic means disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetic field selectively oriented to deflect the electron beam from the cathode into alignment with the aperture in the wall element.

Claim 8

An electron gun comprising: a hollow cylindrical electrode having a substantially electrostatic field-free space therein; an electron emitting cathode operatively disposed adjacent one end of the cylindrical electrode for directing a beam of electrons therein; an electrode wall element disposed transversely with respect to the cylindrical electrode and adjacent the other end thereof, the wall element having a beam restricting aperture therein; and continuous annular magnetic means disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetic field selectively oriented to deflect the electron beam from the cathode into alignment with the aperture in the wall element.

Claim 9

An electron gun as set forth in claim 4 wherein the magnetic means includes a continuous annular magnetic member transversely disposed in the substantially electrostatic field-free space within the hollow cylindrical electrode and having an opening therein aligned with the beam restricting aperture in the wall element.

Claim 10

An electron gun as set forth in claim 5 wherein the continuous annular member is magnetizable traansversely across the opening therein to have a magnetic field directed between selected opposing portions of the continuous annular member.

Claim 11

An electron tube of the cathode-ray type comprising: an evacuated envelope; an electrode having a target surface transversely disposed within the envelope; an electron gun operatively disposed within the envelope for directing a beam of electrons toward the target surface; the gun including: electron beam generating means including an electron emitting cathode and an axially disposed series of electrodes, at least one of which comprises a hollow cylindrical electrode having a substantially electrostatic field-free space therein; beam limiting means including an electrode wall element disposed transversely with respect to the cylindrical electrode and having a beam restricting aperture therein; and beam aligning magnetic means including a continuous annular magnetic member coaxially disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetic field between selected opposing portions of the annular magnetic member and deflecting the beam into alignment with the aperture.

Claim 12

An electron tube of the cathode-ray type comprising: an evacuated envelope; an electrode having a target surface transversely disposed within the envelope; an electron gun operatively disposed within the envelope for directing a beam of electrons toward the target surface; the gun including: electron beam generating means including an electron emitting cathode and an axially disposed series of electrodes, at least one of which comprises a hollow cylindrical electrode having a substantially electrostatic field-free space therein; beam limiting means including an electrode wall element disposed transversely with respect to the cylindrical electrode and having a beam restricting aperture therein; and beam aligning magnetic means including a continuous annular magnetic member coaxially disposed in the substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetic field between selected opposing portions of the annular magnetic member and deflecting the beam into alignment with the aperture.

Claim 13

An electron tube as set forth in claim 7 wherein the beam limiting means is supported on the cylindrical electrode in axially spaced operative relationship with the magnetic means.

Claim 14

An electron tube as set forth in claim 8 wherein the magnetic member is spaced a predetermined axial distance from the beam restricting aperture and in the direction of the cathode.

Claim 15

An electron tube of the cathode-ray type comprising: a sealed envelope; an electrode having a target surface transversely disposed within the envelope; an electron gun operatively disposed within the envelope for directing a beam of electrons toward the target surface; the gun including: a hollow cylindrical electrode axially disposed with respect to the target surface and having a substantially electrostatic field-free space therein; an electron emitting cathode operatively disposed adjacent one end of the cylindrical electrode for directing a beam of electrons therein; an electrode wall element disposed transversely with respect to the cylindrical electrode and adjAcent the other end thereof, the wall element having a beam restricting aperture therein; and continuous annular magnetic means disposed in a substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetic field selectively oriented to deflect the electron beam from the cathode into alignment with the aperture in the wall element disposed within the sealed envelope.

Claim 16

An electron tube of the cathode-ray type comprising: a sealed envelope; an electrode having a target surface transversely disposed within the envelope; an electron gun operatively disposed within the envelope for directing a beam of electrons toward the target surface; the gun including: a hollow cylindrical electrode axially disposed with respect to the target surface and having a substantially electrostatic field-free space therein; an electron emitting cathode operatively disposed adjacent one end of the cylindrical electrode for directing a beam of electrons therein; an electrode wall element disposed transversely with respect to the cylindrical electrode and adjAcent the other end thereof, the wall element having a beam restricting aperture therein; and continuous annular magnetic means disposed in a substantially electrostatic field-free space within the cylindrical electrode for providing a transverse magnetic field selectively oriented to deflect the electron beam from the cathode into alignment with the aperture in the wall element disposed within the sealed envelope.

Claim 17

An electron tube as set forth in claim 10 wherein the magnetic means includes a continuous annular magnetic member transversely disposed in the substantially electrostatic field-free space within the hollow cylindrical electrode and having an opening therein operatively aligned with the beam restricting aperture in the wall element.