Patent EP0201609A1 successfully refreshed from Google Patents.
EP0201609A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Electron gun of picture display device
Assignee: Panasonic Holdings Corp
•
Filing: 1985-11-19
•
Granted: —
•
Expires: 2005-11-19
Abstract
Abstract A plate-like electron gun of a picture display device which utilizes the emission of thermions and which is used in the field of video information instruments. An electrode on the back of the electron gun comprises a plate-like back electrode (12) which has a conductive film (12a) formed on the surface thereof and which is disposed maintaining a predetermined distance from a plurality of line cathodes (2), and a plurality of spacers (13) that are arranged among said plurality of line cathodes (2), that are secured to said back electrode (12) at the ends of one side, and that have a conductive film (13a) formed on the surfaces thereof. This structure enables the electron gun to be easily manufactured. Further, electric charges are prevented from generating, the electric field is stabilized, and no variance develops in the brightness on the anode surface.
Inventors
- 👤 Toshikazu Murata
- 👤 Yoshinobu Takesako
- 👤 Masayuki Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 10:00
CPC Classifications
H; H01; H01J; H01J29/00; H01J29/02; H01J29/028; H01J29/04; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J31/125; H01J31/126; H01J2329/00; H01J2329/86; H01J2329/8625; H01J2329/863; H01J2329/864; H01J2329/8645; H01J2329/865; H01J2329/8655
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
89 words
An electron gun of an image display apparatus comprising: plural line cathodes arranged parallelly to ench other and with a uniform interval, a flat plate type rear electrode having a conductive film on a surface and disposed with a given distance to said line cathodes, plural spacers fixed on said rear electrode at its one end and formed with a conductive film on surface thereof, and plural convergence electrodes fixed on the other end of said plural spacers and being for converging electron beam emitted from said line cathodes.
Claim 2
Dependent Claim
89 words
An electron gun of an image display apparatus comprising: plural line cathodes arranged parallelly to ench other and with a uniform interval, a flat plate type rear electrode having a conductive film on a surface and disposed with a given distance to said line cathodes, plural spacers fixed on said rear electrode at its one end and formed with a conductive film on surface thereof, and plural convergence electrodes fixed on the other end of said plural spacers and being for converging electron beam emitted from said line cathodes.
Claim 3
Dependent Claim
127 words
An electron gun of an image display apparatus comprising: plural line cathodes arranged parallelly to each other and with a uniform interval, a flat plate type rear electrode having a conductive film on a surface and disposed with a given distance to said line cathodes, plural spacers fixed on said rear electrode at its one end and formed with a conductive films on surface thereof, and plural convergence electrodes fixed on the other end of said plural spacers and being for converging electron beam emitted from said line cathodes, wherein: said conductive films formed on sides of the spacers and the conductive film of said rear electrode are connected electrically and the conductive films formed on sides of said spacers and said convergence electrodes are electrically isolated.
Claim 4
Dependent Claim
127 words
An electron gun of an image display apparatus comprising: plural line cathodes arranged parallelly to each other and with a uniform interval, a flat plate type rear electrode having a conductive film on a surface and disposed with a given distance to said line cathodes, plural spacers fixed on said rear electrode at its one end and formed with a conductive films on surface thereof, and plural convergence electrodes fixed on the other end of said plural spacers and being for converging electron beam emitted from said line cathodes, wherein: said conductive films formed on sides of the spacers and the conductive film of said rear electrode are connected electrically and the conductive films formed on sides of said spacers and said convergence electrodes are electrically isolated.
Claim 5
Dependent Claim
35 words
An electron gun of an image display apparatus in accordance with claim 2, wherein edge parts of longer side of said spacer are chambered, and conductive film are not formed on said chambered edge parts.
Claim 6
Dependent Claim
29 words
An electron gun of an image display apparatus in accordance with claim 2, wherein conductive films are not formed on both edge areas along longer sides of said spacers.
Claim 7
Dependent Claim
114 words
An electron gun of an image display apparatus comprising: plural line cathodes arranged parallelly to each other and with a uniform interval, a flat plate type rear electrode having a conductive film on a surface and disposed with a given distance to said line cathodes, plural spacers fixed on said rear electrode at one end and formed with a conductive films on surface thereof, and plural convergence electrodes fixed on the other end of said plural spacers and being for converging electron beam emitted from said line cathodes, wherein; said conductive films formed on sides of the spacers are electrically isolated from a conductive film formed on said rear electrode and said convergence electrode.
Claim 8
Dependent Claim
114 words
An electron gun of an image display apparatus comprising: plural line cathodes arranged parallelly to each other and with a uniform interval, a flat plate type rear electrode having a conductive film on a surface and disposed with a given distance to said line cathodes, plural spacers fixed on said rear electrode at one end and formed with a conductive films on surface thereof, and plural convergence electrodes fixed on the other end of said plural spacers and being for converging electron beam emitted from said line cathodes, wherein; said conductive films formed on sides of the spacers are electrically isolated from a conductive film formed on said rear electrode and said convergence electrode.
Claim 9
Dependent Claim
35 words
An electron gun of an image display apparatus in accordance with claim 5, wherein edge parts of longer side of said spacers are chambered, and conductive films are not formed on said chambered edge parts.
Claim 10
Dependent Claim
29 words
An electron gun of an image display apparatus in accordance with claim 5, wherein conductive films are not formed on both edge areas along longer sides of said spacers.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.