| 摘要 |
The synchronizing switch for an electronic flash unit, which is connected to the body of a photographic camera through the medium of an adapter, is closed with a variable delay following the actuation of camera release by way of an impeller which is mounted in the camera and normally serves to initiate the firing of flash lamps in an indexible flashcube or magicube. When the impeller moves to an extended position following the actuation of camera release, it rotates a driving member which is mounted in the housing of the adapter and is connected to or made integral with one end of a leaf spring. The other end of the leaf spring carries a weight whose inertia is such that, when the driving member is rotated by the impeller, the spring undergoes at least some deformation before the weight leaves its normal position and moves toward a second position in which it closes the synchronizing switch. The synchronizing switch has two normally separated contacts which are urged against each other when the weight reaches its second position. Alternatively, one contact of the switch may be electrically connected with the weight which consists of conductive material and engages the other contact as soon as it reaches the second position.
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