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US 6,353,280 B1Granted
Spacer for image-forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsMasaaki Shibata, Sotomitsu Ikeda, Toyoko Kobayashi, Masato Yamanobe
Life of this patent
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Abstract
An image-forming apparatus comprises a rear plate on which an electron-emitting device is provided, a face plate having an image-forming member and arranged to be opposed to the rear plate, and a spacer provided between the face plate and the rear plate. The spacer comprises a spacer base plate and a coating layer including organic resin and carbon. At least part of the carbon is exposed from the surface of the coating layer. The image-forming apparatus displays an image with a high luminance and a high color saturation over a prolonged time.
Claims8
A spacer for an image forming apparatus comprising:
- a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface;
- and
- a conductive film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by the conductive film has a plurality of concavities forming a concave and convex surface,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- l≧p/2, wherein l is a length of each concavity and p is a pitch of the concave and convex surface.
2 more elements
A spacer for an image forming apparatus comprising:
- a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface;
- and
- a conductive film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by the conductive film has a plurality of concavities forming a concave and convex surface,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- t≧0.2 l, and l≧p/2, wherein t is a depth of each concavity, l is a length of each concavity and p is a pitch of the concave and convex surface.
2 more elements
A spacer for an image forming apparatus comprising:
- a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface;
- and
- a film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by the film has a plurality of concavities forming a concave and convex surface,
- wherein said film comprises a material which has a smaller secondary electron emission coefficient than that of a material comprising said spacer base member and is electroconductive,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- l≧p/2, wherein l is a length of each concavity and p is a pitch of the concave and convex surface.
3 more elements
A spacer for an image forming apparatus comprising:
- a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface;
- and
- a film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by the film has a plurality of concavities forming a concave and convex surface,
- wherein said film comprises a material which has a smaller secondary electron emission coefficient than that of a material comprising said spacer base member and is electroconductive,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- t≧0.2 l, and l≧p/2, wherein t is a depth of each concavity, l is a length of each concavity and p is a pitch of the concave and convex surface.
3 more elements
An image forming apparatus comprising:
- a rear plate on which an electron-emitting device is disposed;
- a face plate opposing said rear plate and provided with an image forming member;
- and
- a spacer disposed between said rear plate and said face plate, said spacer comprising a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface, and a conductive film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by said conductive film has a plurality of concavities forming a concave and convex surface,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- l≧p/2, wherein l is a length of each concavity and p is a pitch of the concave and convex surface.
3 more elements
An image forming apparatus comprising:
- a rear plate on which an electron-emitting device is disposed;
- a face plate opposing said rear plate and provided with an image forming member;
- and
- a spacer disposed between said rear plate and said face plate, said spacer comprising a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface, and a conductive film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by said conductive film has a plurality of concavities forming a concave and convex surface;
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- t≧0.2 l, and l≧p/2, wherein t is a depth of each concavity, l is a length of each concavity and p is a pitch of the concave and convex surface.
3 more elements
An image forming apparatus comprising:
- a rear plate on which an electron-emitting device is disposed;
- a face plate opposing said rear plate and provided with an image forming member;
- and
- a spacer disposed between said rear plate and said face plate, said spacer comprising a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface, and a film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by the film has a plurality of concavities forming a concave and convex surface,
- wherein said film comprises a material which has a smaller secondary electron emission coefficient than that of a material comprising said spacer base member and is electroconductive,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- l≧p/2, wherein l is a length of each concavity and p is a pitch of the concave and convex surface.
4 more elements
An image forming apparatus comprising:
- a rear plate on which an electron-emitting device is disposed;
- a face plate opposing said rear plate and provided with an image forming member;
- and
- a spacer disposed between said rear plate and said face plate, said spacer comprising a spacer base member, the surface of which comprises a plurality of concavities forming a concave and convex surface, and a film covering the concave and convex surface of said spacer base member so that the surface of said spacer covered by said film has a plurality of concavities forming a concave and convex surface,
- wherein said film comprises a material which has a smaller secondary electron emission coefficient than that of a material comprising said spacer base member and is electroconductive,
- wherein the resistance of said conductive film is in the range of 109Ω/□ to 1012Ω/□, and
- t≧0.2 l, and l≧p/2, wherein t is depth of each concavity, l is a length of each concavity and p is a pitch of the concave and convex surface.
4 more elements
Dependencies are inferred from the claim text.