Patent ID: 7178998
Filing Date: 2007-02-20
Classification: G03B

Abstract:
1. A focal plane shutter for a digital still camera, comprising: two base boards, each having an exposure opening, arranged to form a blade chamber between both the base boards; one shutter blade having a plurality of arms arranged within the blade chamber, one end of each arm being rotatably attached to any one of the base boards, and at least one blade pivoted to the arms; a DC motor being reciprocally rotatable and attached to any one of the base boards; a drive member, having a drive pin connected to one of the arms, for driving the shutter blade to open and close the opening by being reciprocally rotated by the DC motor; and a detecting device for detecting, during movement of the shutter blade, whether the shutter blade reaches a position where the opening is positioned just before a fully opened state and whether the shutter blade reaches a position where the opening is positioned just before a fully closed state, wherein, during exposure operation, the shutter blade is driven by the DC motor via the drive member, and wherein an electric current for driving the DC motor is interrupted or limited in response to a detection signal of the detecting device.