经过多年的实践,投射式投影器在教学中稍有不慎,即会烧坏灯泡,一是不经济,二是给教学带来负面影响。原因:温度上升,往往会使投影器的故障机率增加,如风扇停转或风速减慢,导致热量聚集,温升急剧,导致投影器内灯泡的灯丝熔断。为避免之,本人经过构思、实践,只需花两元钱左右就能使 After many years of practice, the projection projector in teaching a little carelessness, that is, will burn out the bulb, one is not economical, the second is to give teaching a negative impact. Reasons: The temperature rise tends to increase the projector’s chance of failure, such as fan stalls or wind speed slowing, resulting in heat buildup and rapid temperature rise, causing the bulb in the projector to blown. To avoid it, I conceived and practiced it only with about two dollars