照相机快门是使胶片获得合适曝光量的时间控制机构。在照相机发展早期，由于感光材料感光度很低，所需曝光时间很长，采用装上、卸下镜头盖来控制曝光时间。随着感光材料感光度的增高和拍摄要求的不断提高，逐步形成了我们所说的现代意义上的快门，它是控制曝光时间长短的机构 The camera shutter is a time control mechanism that gives the film a proper amount of exposure. Early in the development of the camera, due to the sensitivity of the photosensitive material is very low, the required exposure time is very long, with the installation, remove the lens cover to control the exposure time. With the increasing sensitivity of photographic materials and shooting requirements continue to increase, and gradually formed what we call the shutter in the modern sense, it is the control of the length of exposure mechanism