Patent ID: 9188836
Filing Date: 2015-11-17
Classification: G03B

Abstract:
1. A shutter device comprising: a stepping motor configured to be driven in open-loop driving mode at which an energization state of a coil is switched at predetermined time intervals and in feed-back driving mode at which the energization state of the coil is switched in accordance with a rotation position of a rotor; a driven member configured to be driven by the stepping motor; and a light shielding member configured to travel between a closed state in which an aperture is closed and an open state in which the aperture is open, wherein the light shielding member is driven by the driven member, wherein the driven member is configured to provide a first driven zone and a second driven zone, wherein in a case where the driven member is driven in the first driven zone, the light shielding member maintains the closed state or the open state, wherein in a case where the driven member is driven in the second driven zone, the light shielding member travels from the closed state to the open state or from the open state to the closed state, wherein the driven member is driven in the first driven zone by the stepping motor in one direction, and after the driven member is driven in the first driven zone, the driven member is driven in the second driven zone, wherein in a case where the driven member is driven in the first driven zone, the stepping motor drives the driven member in the open-loop driving mode, and wherein in a case where the driven member is driven in the second driven zone, the stepping motor drives the driven member in the feed-back driving mode.