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黑白显象管的核心部件——透镜,也称光学系统。把透镜的各个零件相对固定在夹具上,用煤气火头将玻璃杆烧软,经热压即成透镜。这样一来,玻璃杆和零件表面上就附有微痕量的碳和硫等杂质。在工艺过程中也可能有尘埃沾污。这些脏物如果带进管子里,在真空中分解、扩散、迁移,会造成阴极中毒,极间表面电阻降低。严重时,会出现阴极无发射,电极间打火或短路,使整管报废。因此,透镜的清洗工艺至关重要。以前采用的清洗工艺为:丙酮超声波清洗
The core of black and white CRT - lens, also known as optical system. The various parts of the lens is relatively fixed in the fixture, the fire with a glass rod burning soft glass, the lens that is hot pressing. As a result, the surface of glass rods and parts with a trace of trace impurities such as carbon and sulfur. Dust contamination may also occur during the process. If these dirt into the tube, in a vacuum decomposition, diffusion, migration, will cause the cathode poisoning, reduce the surface resistance between the electrodes. Serious, there will be no cathode emission, sparks or short circuit between the electrodes, so that the entire tube scrapped. Therefore, the lens cleaning process is crucial. Previously used cleaning process: acetone ultrasonic cleaning