Magnetic channel cathode for a flat panel display
An electron source, e.g. for a flat panel display, comprises a permanent magnet 102,104 having channels extending between opposite poles. The internal surfaces of the channels are conductive. A cathode (204, fig 2) is located at a first pole of the magnet, at one end of the channels. Each channel wi...
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| creator | JOHN STUART BEETESON |
| description | An electron source, e.g. for a flat panel display, comprises a permanent magnet 102,104 having channels extending between opposite poles. The internal surfaces of the channels are conductive. A cathode (204, fig 2) is located at a first pole of the magnet, at one end of the channels. Each channel within the magnet has a plurality of perforations 106 located on a surface of the permanent magnet. A potential applied between the cathode and the conductive internal surfaces of the channels causes electrons to be received into the channels Each perforation 106 gives rise to a null field region where electrons collect. An electron beam for guidance towards a target can be extracted from the null field region 602 by applying an electric field over the perforation. A variety of kinds of cathode are described, including line filament cathodes and micromachined cathodes. |
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A cathode (204, fig 2) is located at a first pole of the magnet, at one end of the channels. Each channel within the magnet has a plurality of perforations 106 located on a surface of the permanent magnet. A potential applied between the cathode and the conductive internal surfaces of the channels causes electrons to be received into the channels Each perforation 106 gives rise to a null field region where electrons collect. An electron beam for guidance towards a target can be extracted from the null field region 602 by applying an electric field over the perforation. 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The internal surfaces of the channels are conductive. A cathode (204, fig 2) is located at a first pole of the magnet, at one end of the channels. Each channel within the magnet has a plurality of perforations 106 located on a surface of the permanent magnet. A potential applied between the cathode and the conductive internal surfaces of the channels causes electrons to be received into the channels Each perforation 106 gives rise to a null field region where electrons collect. An electron beam for guidance towards a target can be extracted from the null field region 602 by applying an electric field over the perforation. A variety of kinds of cathode are described, including line filament cathodes and micromachined cathodes.</description><subject>BASIC ELECTRIC ELEMENTS</subject><subject>ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS</subject><subject>ELECTRICITY</subject><fulltext>true</fulltext><rsrctype>patent</rsrctype><creationdate>2000</creationdate><recordtype>patent</recordtype><sourceid>EVB</sourceid><recordid>eNrjZDD0TUzPSy3JTFZIzkjMy0vNUUhOLMnIT0lVSMsvUkhUSMtJLFEoSARJpGQWF-QkVvIwsKYl5hSn8kJpbgZ5N9cQZw_d1IL8-NTigsTkVKCB8e5ORsYmhkZmlo7GhFUAALJ-Kkg</recordid><startdate>20000308</startdate><enddate>20000308</enddate><creator>JOHN STUART BEETESON</creator><scope>EVB</scope></search><sort><creationdate>20000308</creationdate><title>Magnetic channel cathode for a flat panel display</title><author>JOHN STUART BEETESON</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-epo_espacenet_GB2341269A3</frbrgroupid><rsrctype>patents</rsrctype><prefilter>patents</prefilter><language>eng</language><creationdate>2000</creationdate><topic>BASIC ELECTRIC ELEMENTS</topic><topic>ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS</topic><topic>ELECTRICITY</topic><toplevel>online_resources</toplevel><creatorcontrib>JOHN STUART BEETESON</creatorcontrib><collection>esp@cenet</collection></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext_linktorsrc</fulltext></delivery><addata><au>JOHN STUART BEETESON</au><format>patent</format><genre>patent</genre><ristype>GEN</ristype><title>Magnetic channel cathode for a flat panel display</title><date>2000-03-08</date><risdate>2000</risdate><abstract>An electron source, e.g. for a flat panel display, comprises a permanent magnet 102,104 having channels extending between opposite poles. The internal surfaces of the channels are conductive. A cathode (204, fig 2) is located at a first pole of the magnet, at one end of the channels. Each channel within the magnet has a plurality of perforations 106 located on a surface of the permanent magnet. A potential applied between the cathode and the conductive internal surfaces of the channels causes electrons to be received into the channels Each perforation 106 gives rise to a null field region where electrons collect. An electron beam for guidance towards a target can be extracted from the null field region 602 by applying an electric field over the perforation. A variety of kinds of cathode are described, including line filament cathodes and micromachined cathodes.</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | BASIC ELECTRIC ELEMENTS ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY |
| title | Magnetic channel cathode for a flat panel display |
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