本文结合显象管的特点,论述了储存式阴极能比普通氧化物阴极更为可靠和寿命长的原因。储存式阴极的特点在于具有一个能自动控制活性物质输送的缓冲器。当活性钡的产生过多时,它能大量吸收这种钡;当发射表面上的活性钡减少时,它又能通过扩散而加以补充。所以储存式阴极能在比较恶劣的环境下保持发射稳定,从而获得长寿命。 In this paper, with the characteristics of the CRT, the reason why the storage cathode is more reliable and longer life than the common oxide cathode is discussed. The feature of the storage cathode is the presence of a buffer that automatically controls the transport of the active material. When active barium is produced too much it can absorb this barium in large quantities; it can then be replenished by diffusion as the active barium on the emitting surface decreases. Therefore, the storage cathode can maintain emission stability in the harsh environment, resulting in long life.