Tungsten Heater and Kinescope

The metal is heated in vacuum to evaporate on the surface of the object which is going to be deposited, and then form a thin film, that is vacuum coating process, which is now widely used in electronics, glass, ornaments and other production areas. Now most users at home and abroad choose tungsten heater that stranded by tungsten wire as a heating element for vacuum coating. What’s more, the kinescope deposition process is mainly used wolfram heater as a heating element.

Kinescope, shortened to kine, also known as tape-recording in Britain, is a recording of a television program on motion picture film, directly through a lens focused on the screen of a video monitor. Typically, the term can refer to the process itself, the equipment used for the procedure (a 16 mm or 35 mm movie camera mounted in front of a video monitor, and synchronized to the monitor's scanning rate), or a film made using the process. Kinescopes were intended to be used for immediate rebroadcast, or for an occasional repeat of a pre recorded program. In order to reproduce high-quality images, it requires that the screen size of electron ray tube should be large, higher-resolution images and the screen has sufficient emission brightness.

The fluorescent screen of this beam tube composes of screen glass, a phosphor layer and an aluminum film. On the surface of the glass inside CRT screen, which is deposited phosphor with a thickness of 10μm. An aluminum film with a thickness of 1μm is deposited on the outside of the phosphor layer. This film layers are connected to the graphite, it can accelerate the electron beam, and it can also protect the phosphor, so that it will not be damaged because of an ion spot formed by ions, which shows the importance of the aluminum layer. This aluminum layer is formed by tungsten heater as a heating element in evaporation.

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