公开(公告)号：US20010015613A1

公开(公告)日：2001-08-23

申请号：US09756746

申请日：2001-01-10

Inventor： Sachio Koizumi ,  Toshifumi Komiya ,  Norio Iwamura

IPC: H01J019/48

CPC classification number: H01J29/04 ,  H01J1/22 ,  H01J2201/2867

Abstract: A cathode ray tube has a phosphor screen and an electron gun including an indirectly heated cathode structure and a plurality of electrodes disposed downstream of the indirectly heated cathode structure for projecting an electron beam toward the phosphor screen, and a deflection yoke for scanning the electron beam on the phosphor screen. The indirectly heated cathode structure includes: a base metal having an electron emissive material coating on an outer top surface thereof; a metal sleeve having the base metal attached to an end of the metal sleeve; a heater housed partly within the metal sleeve which includes a major heating portion formed of a spirally wound heating wire and leg portions formed of heating wires wound spirally in a plurality of layers; an insulating film covering the major heating portion and a portion of each of the leg portions continuous with the major heating portion; and a black coating film covering a portion of the insulating film extending from the major heating portion toward each of the leg portions, the whole of the black coating film being housed within the metal sleeve.

Abstract translation: 阴极射线管具有荧光屏和包括间接加热的阴极结构的电子枪和设置在间接加热的阴极结构的下游的多个电极，用于将电子束投射到荧光屏，以及用于扫描电子束的偏转线圈 在荧光屏上。 间接加热的阴极结构包括：在其外顶表面上具有电子发射材料的母材; 金属套筒，其具有附接到金属套筒的端部的基底金属; 部分地容纳在金属套筒内的加热器，其包括由螺旋卷绕的加热丝线形成的主要加热部分和由多层螺旋缠绕的加热线形成的腿部分; 覆盖主加热部的绝缘膜和与主加热部连续的各腿部的一部分; 以及黑色涂膜，其覆盖从主加热部分朝向每个腿部延伸的绝缘膜的一部分，整个黑色涂膜被容纳在金属套筒内。