Blade driving device for use in cameras

A blade driving device for use in cameras, the blade driving device comprising:

• a mechanical blade openably and closably disposed in front of an image pickup element, the mechanical blade being capable of blocking a part or all of light passing through an exposure aperture or capable of reducing light passing therethrough;
• an electromagnetic actuator for enabling the blade to perform an opening motion according to opening energization and enabling the blade to perform a closing motion according to closing energization;
• and
• a control means for drive-controlling the electromagnetic actuator and applying opening energization to the electromagnetic actuator so as to allow the blade to pre-perform an opening motion before performing a closing motion when an amount of light incident on the image pickup element becomes equal to or less than a predetermined level in a photographic standby state.

A blade driving device for use in cameras, the blade driving device comprising:

• a mechanical blade openably and closably disposed in front of an image pickup element, the mechanical blade being capable of blocking a part or all of light passing through an exposure aperture or capable of reducing light passing therethrough;
• an electromagnetic actuator for enabling the blade to perform an opening motion according to opening energization and enabling the blade to perform a closing motion according to closing energization;
• and
• a control means for drive-controlling the electromagnetic actuator and applying opening energization to the electromagnetic actuator so as to allow the blade to pre-perform an opening motion before performing a closing motion when a signal is output from a shock sensor used to detect an impulsive force in a photographic standby state.