| 摘要 |
A focal plane shutter is provided with a switching mechanism having an electromagnet and a stopping member. The stopping member is provided with an engaging portion able to lock an engagement portion provided in a first driving member for a leading edge, and an operating portion wherein a direction of a force, in relation to the electromagnet, switches, in accordance with switching between an application and removal of an electric current in a single direction to the electromagnet, so as to move the engaging portion to a position wherein it is able to release locking of the engagement portion when the electric current is applied, and to move the engaging portion to a position wherein it is able to lock the engagement portion when the electric current is removed. |
| 主权项 |
1: A focal plane shutter for a camera comprising:
a driving mechanism for a leading blade, having
a first driving member for the leading blade, which drives a leading blade group in a direction of closing an exposure opening, through rotation by a biasing force of a set spring, anda second driving member for the leading blade, which drives the leading blade group in a direction of opening the exposure opening, through pushing the first driving member against the biasing force of the set spring through rotation through a biasing force of a driving spring for the leading blade; and a switching mechanism that switches between imaging in a normally open system, in which an image frame is opened during standby after an exposing operation, and imaging in a normally closed system, in which the image frame is closed during standby after the exposing operation, through switching between stopping and releasing of the stop ping, by the first driving member, of rotation in the direction of closing the exposure opening by the leading blade, wherein: the switching mechanism has
an electromagnet to which an electric current is applied in only a single direction, anda stopping member having
an engaging portion able to lock an engagement portion that is provided in the first driving member for the leading edge, andan operating portion wherein a direction of a force, in relation to the electromagnet, switches, in accordance with switching between an application and removal of an electric current in the single direction to the electromagnet, so as to move the engaging portion to a position wherein it is able to release locking of the engagement portion when the electric current is applied, and to move the engaging portion to a position wherein it is able to lock the engagement portion when the electric current is removed; and the rotation of the first driving member for the leading blade in the direction, in which the leading blade closes the exposure opening, is switched between being stopped, and released from the stop, depending on the locking, or the release of the locking, of the engagement portion by the engaging portion after the exposing operation and prior to the standby. |
