Back to results
US 6,787,983 B2Granted
Image-forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasato Yamanobe, Fumio Kishi
Life of this patent
Estimating the term…
Abstract
An image-forming apparatus includes an envelope, an electron source and an image-forming member arranged within the envelope, as well as an electron source drive circuit. An electroconductive member is arranged on the inner wall surface of the envelope between the electron source and the image-forming member. An electric current flow path A is formed as extending between the electroconductive member and the ground without passing through any of the electron source and the drive circuit. The electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between the electroconductive member and the ground by way of the electron source or the drive circuit.
Claims26
An image-forming apparatus comprising
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit, and
- wherein said envelope carries an anti-charge film arranged on said inner wall surface thereof.
5 more elements
An image-forming apparatus comprising
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit, and
- wherein said envelope carries an electroconductive film having a sheet resistance between 108 Ω/□ and 1010 Ω/□ on said inner wall surface thereof.
5 more elements
An image-forming apparatus comprising:
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit, and
- wherein said electron source is entirely surrounded by said electroconductive member.
5 more elements
An image-forming apparatus comprising:
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit,
- said electric current flow path A has a conductor terminal abutting against said electroconductive member;
- and
- wherein said conductor terminal is drawn out of said envelope through a substrate side thereof where said image-fanning member is arranged.
7 more elements
An image-forming apparatus comprising:
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit,
- said image-forming member is arranged opposite to said electron source and said electroconductive member is arranged on a substrate side of said envelope where said electron source is arranged, and
- said image-forming member has an accelerator electrode for accelerating the electrons emitted from said electron source and a voltage applying terminal of said accelerator electrode is drawn out of said envelope through a substrate side thereof where said electron source is arranged.
6 more elements
An image-forming apparatus comprising:
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit,
- said image-forming member is arranged opposite to said electron source and said electroconductive member is arranged on a substrate side of said envelope where said electron source is arranged, and
- said image-forming member has an accelerator electrode for accelerating the electrons emitted from said electron source and a voltage applying terminal of said accelerator electrode is drawn out of said envelope through a substrate side thereof where said image-forming member is arranged.
6 more elements
An image-forming apparatus comprising:
- an envelope;
- an electron source and an image-forming member arranged within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of sad envelope between said electron source and said image forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and said drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit,
- said image-forming member is arranged opposite to said electron source and said electroconductive member is arranged on a substrate side of said envelope where said electron source is arranged, and
- wherein said envelope carries an anti-charge film arranged on said inner wall surface thereof.
6 more elements
An image-forming apparatus, comprising
- an envelope;
- an electron source and an image-forming member arranged within said envelope,
- an electron source drive circuit;
- an electroconductive member arranged on an inner wall surface of said envelope between said electron source and said image-forming member;
- and
- an electric current flow path A extending between said electroconductive member and the ground without passing through said electron source and drive circuit, wherein
- said electric current flow path A has a resistance lower than the resistance of another electric current flow path B extending between said electroconductive member and the ground by way of said electron source or said drive circuit,
- said image-forming member is arranged opposite to said electron source and said electroconductive member is arranged on a substrate side of said envelope where said electron source is arranged, and
- said envelope carries an electroconductive film having a sheet resistance between 108 Ω/□ and 1010 Ω/□ on said inner wall surface thereof.
6 more elements
An image-forming apparatus comprising:
- an envelope having an inner wall surface;
- an electron source and an image-forming member arranged opposite to each other within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on the inner wall surface of said envelope between said electron source and said image forming member, said electroconductive member being apart from said electron source;
- a ground connection terminal abutting said electroconductive member and connected to the ground, said ground connection terminal having a resistance A;
- and
- an anti-charge film arranged on at least put of the inner wall surface of said envelope between said electron source and said electroconductive member and connected to the electron source and the electroconductive member, said anti-charge film having a resistance B, wherein
- the resistance A of said ground connection terminal is lower than the resistance B of said anti-charge film.
5 more elements
An image-forming apparatus comprising:
- an envelope having an inner wall surface;
- an electron source and an image-forming member arranged opposite to each other within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on the inner wall surface of said envelope between said electron source and said image forming member, said electroconductive member surrounding and being apart from said electron source;
- and
- a ground connection terminal abutting said electroconductive member and connected to the ground, wherein
- a resistance A of said ground connection terminal is lower than a resistance B between said electron source and said electroconductive member.
4 more elements
An image-forming apparatus comprising:
- an envelope having an inner wall surface;
- an electron source and an image-forming member arranged opposite to each other within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on the inner wall surface of said envelope between said electron source and said image forming member, said electroconductive member surrounding and being apart from said electron source;
- a ground connection terminal abutting said electroconductive member and connected to the ground, said ground connection terminal having a resistance A;
- and
- an anti-charge film arranged on at least part of the inner wall surface of said envelope between said electron source and said electroconductive member and connected to the electron source and the electroconductive member, said anti-charge film having a resistance B, wherein
- the resistance A of said ground connection terminal is lower than the resistance B of said anti-charge film.
5 more elements
An image-forming apparatus comprising:
- an envelope having an inner wall surface;
- an electron source and an image-forming member arranged opposite to each other within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on the inner wall surface of said envelope between said electron source and said image forming member, said electroconductive member being apart from said electron source;
- a connection terminal connecting said electroconductive member to a reference potential, said connection terminal having a first resistance, and
- an anti-charge film arranged on at least part of the inner wall surface of said envelope between said electron source and said electroconductive member and connected to the electron source and the electroconductive member, said anti-charge film having a second resistance, wherein
- the first resistance is lower than the second resistance.
4 more elements
An image-forming apparatus comprising:
- an envelope having an inner wall surface;
- an electron source and an image-forming member arranged opposite to each other within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on the inner wall surface of said envelope between said electron source and said image forming member, said electroconductive member surrounding and being apart from said electron source, and
- a connection terminal connecting said electroconductive member to a reference potential, wherein
- a resistance A of said connection terminal and a resistance B between said electron source and said electroconductive member satisfy a relation of A<B.
3 more elements
An image-forming apparatus comprising:
- an envelope having an inner wall surface;
- an electron source and an image-forming member arranged opposite to each other within said envelope;
- an electron source drive circuit;
- an electroconductive member arranged on the inner wall surface of said envelope between said electron source and said image forming member, said electroconductive member surrounding and being apart from said electron source;
- a connection terminal connecting said electroconductive member to a reference potential, said connection terminal having a first resistance;
- and
- an anti-charge film arranged on at least part of the inner wall surface of said envelope between said electron source and said electroconductive member and connected to the electron source and the electroconductive member, said anti-charge film having a second resistance, wherein
- the first resistance is lower than the second resistance.
5 more elements
Dependencies are inferred from the claim text.