Cine camera battery saver switch - has transistorised holding circuit for electromagnetic switch which releases after filming by RC timing components

摘要

Electromagnetic battery saver master switch is for a cine camera. The switch is manually operated before filming and disconnected after a predetermined time period when filming is completed. Before filming a switch (2) is moved to 'ON' (3 to 4) so that a transistorised circuit is powered to hold an electromagnetic switch (9) with armature as switch lever (7). For the duration of filming a capacitor (24) is kept charged through the camera operate button (31, 26, 27). After filming the charge decays through a time constant circuit (22) and the electromagnetic switch (9) by releasing a spring (11) armature (7) disconnected a main battery switch (14, 13).