Blade drive device and optical instrument

An optical instrument, comprising a blade drive device, the blade drive device, comprising:

• a board including an opening;
• first and second blades opening and closing the opening;
• first and second actuators respectively driving the first and second blades,
• wherein the first and second actuators respectively include first and second stators, first and second rotors, and first and second coils, and respectively drive the first and second blades through first and second drive members,
• wherein the first drive member is arranged to overlap the first stator and the first coil in an optical axis direction, and
• wherein the second drive member is arranged to overlap the second stator and the second coil in the optical axis direction;
• and
• a first output member rotating together with the first rotor,
• wherein the first drive member is engaged with the first output member and drives the first blade,
• wherein at least part of the first output member and at least part of the first drive member overlap at least part of the first stator and the first coil in the optical axis direction,
• wherein the first drive member is engaged with the first blade,
• wherein a rotational axis of the first output member is identical to a rotational axis of the first rotor,
• wherein a rotational axis of the first drive member is positioned away from the rotational axis of the first output member, and
• wherein the rotational axis of the first drive member overlaps the first stator and the first coil in the optical axis direction and is positionally displaced from the rotational axis of the first rotor.