Secondary-electron multiplier dynode
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorYoshio Kishimoto
Life of this patent
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Abstract
A surface layer type secondary-electron multiplier consisting of a support and a secondary-electron emissive and electron-conductive high-polymer layer formed thereupon is disclosed. For forming the secondary-electron emission layer, paint consisting of an electron-conductive high-polymer dissolved or suspended in solvents is used. Alternatively, the support may consist of a nitrogen- or sulphur-containing electron-donor polymeric composition which may be molded or formed, and a charge-transfer complex conductive layer may be formed upon the support.
Claims14
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons by coating said support or substrate with a paint comprising said polymer composition dissolved in a solvent into which are dispersed electro-conductive particles.
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons by coating said support or substrate with a paint comprising a charge-transfer complex type semi-conductive high polymer and a solvent.
In a dynode for a secondary electron multiplier having a dynode support or substrate made of an electrically insulating material and a secondary electron emissive and electron conductive layer formed upon a surface of said support or substrate the improvement which comprises forming said support or substrate from a nitrogen- or sulfur-containing electron donor high polymer composition and said secondary electron emissive and electron conductive layer from a high polymer composition emitting more secondary electrons than primary electrons and including a charge-transfer complex produced by introducing an electron acceptor or its salt into a surface of said support or substrate.
A dynode for a secondary electron multipler comprising a dynode support or substrate made of an electrically insulating material and a secondary electron emission layer of a secondary emission yield higher than 1 comprising an electron conductive high polymer composition of resistivity of 10.sup.5 -10.sup.10 ohm.cm formed upon a surface of said support or substrate by coating said support or substrate with a paint comprising a thermoplastic resin dissolved in a solvent into which are dispersed electrically conductive particles.
Dependencies are inferred from the claim text.