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AssigneeCanon Kabushiki Kaisha
InventorsIchiro Nomura, Masato Yamanobe, Hidetoshi Suzuki, Toshihiko Takeda, Tatsuya Iwasaki
Estimating the term…
In an electron beam apparatus including an enclosure in which an electron-emitting device having an electron-emitting region between opposite electrodes is disposed, the electron-emitting device exhibits such a characteristic as that an emission current is uniquely determined with respect to a device voltage. The interior of the enclosure is maintained under an atmosphere effective to prevent structural changes of the electron-emitting device. An image-forming apparatus includes an enclosure in which an electron source and an image-forming member are disposed, the electron source having the above electron-emitting device. An emission current is stable with a very small change in the amount of electrons emitted, a sharp image is produced with high contrast, and gradation control is easily carried out.
An electron beam apparatus comprising an enclosure in which an electron-emitting device having an electron-emitting region between opposite electrodes is disposed, wherein a material containing carbon as a main ingredient is present at the electron emitting region and its vicinity, and wherein an interior of said enclosure is maintained under an atmosphere in which a partial pressure of residual carbon compounds is less than 1×10−10 Torr, so as to prevent materials containing carbon as a main ingredient from further depositing on said electron emitting device.
An electron beam apparatus comprising an enclosure in which an electron-emitting device is disposed, wherein said electron-emitting device has an electron-emitting region in which material containing carbon exists, and wherein an interior of said enclosure is maintained under an atmosphere in which a partial pressure of residual carbon compounds is less than 1×10−10 Torr.
Dependencies are inferred from the claim text.