| 摘要 |
A focal-plane shutter for digital still cameras includes a first blade covering an exposure aperture only immediately before an exposure operation is performed; a driving member for the first blade having an iron piece member, actuated in an exposure operation; an electromagnet for the first blade for attracting and retaining the iron piece member of the driving member for the first blade and actuating the driving member for the first blade; a cocking member for the first blade, actuating the driving member for the first blade when actuated from the initial position to the cocked position and actuated from the cocked position to the initial position only immediately after the current is supplied to the electromagnet for the first blade; a second blade covering the exposure aperture when the power is turned off and immediately after the exposure operation is completed; a driving member for the second blade having an iron piece member, actuated in the exposure operation; an electromagnet for the second blade for attracting and retaining the iron piece member of the driving member for the second blade and actuating the driving member for the second blade; and a cocking member for the second blade actuating the driving member for the second blade when actuated from the initial position to the cocked position, and actuated from the cocked position to the initial position only immediately after the current is supplied to the electromagnet for the second blade and when the power is turned off.
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