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多媒体时代的牵引车—笔记本电脑、便携式信息终端的普及速度之快令人吃惊。这类便携机,仅日本国内每年就销售大约700万台。其中,大约80％(NTT的推测值)所载的无线数据通信功能都是采用IrDA(红外数据通信协会)标准的红外方式。
Tractor in the multimedia era - the popularity of laptops, portable information terminals surprisingly fast. Only about 7 million units are sold in Japan alone each year. Of these, about 80% (estimated value of NTT) contains wireless data communication using the IrDA (Infrared Data Association) standard infrared method.