照相机问世以后，世界各国的相机生产厂家都在寻求最经济又快捷的方法来取代照相机机身的铜、铁、铝、木。３０年代因为工程塑料还没诞生，所以人们把目光放到胶木上，胶木学名为酚醛塑料，如美国柯达公司１９３４年生产的男孩白朗尼Ｂａｂｙ Ｂｒｏｗｎｉｅ；１９３６年产的Ｂ Cameras came out, the world’s camera manufacturers are looking for the most economical and efficient way to replace the camera body of copper, iron, aluminum, wood. 30 years because the engineering plastics have not yet been born, so people look to the bakelite, Bakelite known as Bakelite, such as the United States Kodak Company in 1934 boy Bailianni Baby Brownie; 1936 B