SHUTTER CONTROL FOR TRAFFIC CAMERA

摘要

PURPOSE:To stably hold specified shutter speed over a long term even when the spring force of a shutter spring is changed with lapse of time. CONSTITUTION:A spring charging gear 111 is rotated by a pulse motor 115 through gears 114, 113 and 112. When the gear 111 is rotated, a charging spring 124 interposed between the gear 111 and a shutter driving gear 110 locked by a cam actuating lever 118 is energized. When the locking by the lever 118 is released by the actuation of a solenoid 123, the energized gear 110 turns a gear 103A integrated with a 1st shutter blade 105 through an idler gear 109 and the gear 103A. Since a 2nd shutter blade 106 is interlocked by the blade 105 and a timing belt 107, they are turned in the same direction, and the apertures 105A and 105B, and 106A and 106B of both shutter blades 105 and 106 open/close an aperture for exposure 102.