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1.发明授权Shadow-mask type color television tube with screening electrodes for converging the electron beams on the shadow mask 失效阴影掩模类型彩色电视管，带屏蔽电极，用于在阴影面罩上转换电子束
公开(公告)号：US3617790A
公开(公告)日：1971-11-02
申请号：US3617790D
申请日：1969-04-10
Applicant: RANK ORGANISATION LTD
Inventor： HILLS DOUGLAS S
CPC classification number: H01J31/205
Abstract: An electron gun assembly for use particularly in a shadow-mask color television cathode-ray tube has a plurality of (usually three) electron emissive areas adjacent which an accelerating electrode or electrodes is or are arranged for producing respective substantially collimated electron beams from electrons emitted by said areas. The collimated beams pass through an apertured screening electrode or electrodes so arranged that the space extending up to the electron emissive areas is effectively screened from electric fields in the tube beyond the screening electrode or electrodes.
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2.发明授权
公开(公告)号：US3619706A
公开(公告)日：1971-11-09
申请号：US3619706D
申请日：1970-02-26
Applicant: RANK ORGANISATION LTD
Inventor： HILLS DOUGLAS S
CPC classification number: H01J29/52
Abstract: A discharge system including a device such as a cathode-ray tube has an electron gun in which an accelerating electrode is placed close to a planar emissive surface of a cathode and is held at a small positive potential to provide an accelerating electric field having unipotential surfaces which are parallel to the electron emissive surface of the cathode. To screen the accelerating field having these unipotential surfaces from the further accelerating electrodes in the gun or in the cathode-ray tube a screening electrode or electrodes is placed in front of the accelerating electrode. In consequence the accelerating electric field close to the electron emissive surface is undistorted by the fields beyond the screening electrode(s), so that the electron beam is devoid of crossover and has a substantially uniform current density over its cross section.
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