SWINGING-SECTOR CAMERA SHUTTER WITH IMPROVED WARNING INDICATOR

摘要

A swinging-sector camera shutter having a plurality of sectors; each sector has a plurality of blades including a primary blade and a plurality of covering blades. The primary blades execute a combined rotary-sliding motion while the covering blades execute a rotary movement about a common pivot point. The shutter has a control lever which, when the shutter is cocked, seizes and moves successively the operating crank of the first rotary slide and the operating crank of the second rotary slide. The second slide is held in the initial position by a pawl under the tension of a spring which disengages this pawl and which, with its other end, is hingedly connected to the control lever and is tensioned at the beginning of the operation of this lever. The shutter has a holding magnet to which voltage is applied at least when the control lever starts operation and this magnet retains the pawl in the locking position against the force of the spring until the magnet is deenergized by a timer.