Focal plane shutter

摘要

Rollers having attached thereto ribbons of a shutter screen of a focal plane shutter are arranged to have either another roller or a shutter screen take-up shaft fitted therein with a frictional force provided between them. The rollers are provided with an engaging part for engagement with an external member. The degree of parallelism between the slit forming ends of the front and rear screens of the shutter forming a slit for exposure is adjustable by operating the external member to rotate the rollers with a force greater than the frictional force.