Cold cathode and method for operating the same
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsToru Kawase, Keisuke Koga
Life of this patent
Estimating the term…
Abstract
A method is applied for operating a cold cathode having at least one electron emission portion and a control electrode for controlling an emission of electrons, in which an electron beam is extracted out of the cold cathode by applying operating voltages to the electron emission portion and the control electrode, respectively. At least one auxiliary electron emission portion is provided other than the electron emission portion positioned at an operating position for emitting electrons. In order to replace the electron emission portion to be operated, the electron emission portions are moved so that the auxiliary electron emission portion is positioned at the operating position.
Claims19
A method for operating a cold cathode having at least one electron emission portion and a control electrode for controlling an emission of electrons, in which an electron beam is extracted out of the cold cathode by applying operating voltages to the electron emission portion and the control electrode, respectively, wherein
- at least one auxiliary electron emission portion is provided other than the electron emission portion positioned at an operating position for emitting electrons, and
- in order to replace the electron emission portion to be operated, the electron emission portions are moved so that the auxiliary electron emission portion is positioned at the operating position.
A method for operating a cold cathode having at least one electron emission portion and a control electrode for controlling an emission of electrons, in which an electron beam is extracted out of the cold cathode by applying operating voltages to the electron emission portion and the control electrode, respectively, wherein
- a plurality of the electron emission portions are disposed axially symmetrically with respect to a center of an operating position for emitting electrons, and
- in order to replace the electron emission portion to be operated, the electron emission portion to be supplied with the operating voltage is changed to the replacing electron emission portion.
A cold cathode comprising:
- at least one electron emission portion;
- and a control electrode for controlling an emission of electrons, in which an electron beam is extracted out of the cold cathode by applying operating voltages to the electron emission portion and the control electrode, respectively, wherein
- at least one auxiliary electron emission portion is provided other than the electron emission portion positioned at an operating position for emitting electrons, and
- a replacing mechanism is provided in order to replace the electron emission portion to be operated, the replacing mechanism being capable of moving the electron emission portions so that the auxiliary electron emission portion is positioned at the operating position.
A cold cathode comprising:
- at least one electron emission portion;
- and a control electrode for controlling an emission of electrons, in which an electron beam is extracted out of the cold cathode by applying operating voltages to the electron emission portion and the control electrode, respectively, wherein
- a plurality of the electron emission portions are disposed axially symmetrically with respect to a center of an operating position for emitting electrons, and
- a replacing mechanism is provided in order to replace the electron emission portion to be operated, the replacing mechanism being capable of changing the electron emission portion to be supplied with the operating voltage to the replacing electron emission portion.
Dependencies are inferred from the claim text.