| 摘要 |
PROBLEM TO BE SOLVED: To provide a mirror quick return mechanism capable of an accurate, high speed operation by eliminating the occurrence of a time loss, in a method for electronically controlling rotation phase control at each operation point even in a system in which a photographing operation by motor drive is performed by normal/reverse rotation of the motor or in a system in which it is performed by unidirectional rotation of the motor. SOLUTION: A cam disk 15 which performs a series of photographing operations including the lifting of a mirror, the starting of a shutter, the lowering of the mirror and the charging of a shutter, and a release disk 22 which has the same axis as the cam disk 15, are set so that they are superimposed one on the other. The two disks are connected via a phase spring 25 so as to realize the mechanism in which the relative angles of the two disks can be changed according to an amount that the phase spring 25 is pressed. A mechanical position restricting means is disposed at the action stop point of the cam disk 15, thereby restricting the rotation of the cam disk 15. The positional restriction of the cam disk 15 is released by the operation of advancing the phase angle of the release disk 22 with respect to the cam disk 15 by the unidirectional rotation of the motor 34 shifting to the subsequent operation. COPYRIGHT: (C)2006,JPO&NCIPI
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