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我们为了便于深入农村演出,根据我县有些地区有电、有些地区无电这一实际情况,试制了一种轻便灵活的天幕投景幻灯。经过一段时间的试用,觉得它有这样一些长处:一、电灯、汽灯都可作光源,有电区、无电区都能运用;二、体积小、重量轻(不包括汽灯只有四斤左右);三、一个光源、两个镜头,在两米远的距离内,可以打满五、六米宽的天幕,能节省灯具和电耗、油耗;四、造价便宜,如不包括灯泡和汽灯,不到二十元;五、结构不复杂,制作简易,材料来源方便,也可以利用废旧物资来做。镜头可用农业上用的放大镜(拆去胶柄即可),隔温玻璃可用座式汽灯的灯罩或亮瓦裁制,外壳可用普通宣传幻灯改制或用铁皮自制。在制作与使用上有如下几点体会: 一、镜头的支架要做得灵活,能上下左右自如地对光、调正画面,不用时,可将镜头取下,便于收藏。二、投景时,如发现画面联接处有阴影,就需
In order to facilitate in-depth rural performances, according to some of our county electricity, in some areas without electricity the fact that a trial of a portable and flexible sky projection. After a period of trial, I feel it has some advantages: First, the lights, steam lamps can be used as a light source, there are electric areas, no electric area can be used; Second, small size, light weight (excluding the gas lamp only about four pounds) ; Third, a light source, two lenses, two meters away from the distance, you can play five or six meters wide canopy, can save lamps and power consumption, fuel consumption; Fourth, cheaper, if not including light bulbs and steam lamps, Less than 20 yuan; 5, the structure is not complicated, easy to make, convenient source of materials, you can also use waste materials to do. The lens can be used agricultural magnifying glass (remove the plastic handle can be), insulated glass available seat lamp shade or light tile cut, the shell can be used to promote publicity slides or made of metal. In the production and use the following experience: First, the lens bracket to be flexible, can freely up and down to light, adjust the picture, when not in use, the lens can be removed for easy collection. Second, when shooting, if you find the screen at the junction shadow, you need