To provide a shutter of a digital camera which can detect closing operation position of its blades, enabling taking suitable photographs.
The shutter blades 3 and 4 are attached freely turnably to the shafts 1b, 1c of the main plate 1 inside the blade chamber, and an output pin 9a of the rotor 9 of the motor is inserted into the long holes of both shafts. A reflection photosensor 16 is attached on the main plate 1, in a direction directed toward the blade chamber, and the shutter blade 3 can pass across this optical path. This photosensor 16 is provided to detect the position of the shutter blade 3, immediately before it starts closing the aperture 1a, and to adjust the charge start time of the solid-state imaging device, when photographing and the power turn-on time of the motor. Further, it can be detected whether the shutter blade 3 bounces and carries out re-exposure, when it touches the stopper 1f at the end of closing operation.
COPYRIGHT: (C)2005,JPO&NCIPI
Koji Sekizawa
Shigeru Yamagishi
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