Anti-vibration actuator and lens unit and camera furnished with same

An anti-vibration actuator for moving an image stabilizing lens, comprising:

• a fixed portion;
• a movable portion to which the image stabilizing lens is attached;
• a movable portion supporting member that supports the movable portion so that it is movable relative to the fixed portion within a plane perpendicular to the optical axis of the image stabilizing lens;
• drive coils attached to one of either the fixed portion or the movable portion;
• drive magnets attached to the other of either the fixed portion or the movable portion so as to respectively face the drive coils;
• and
• at least one yoke attached to the side of the drive coil not facing the drive magnet;
• wherein the at least one yoke includes magnetic force suppressing cutout portions formed in a position overlapping the drive coils in order to suppress magnetic force received from the drive magnet;
• wherein each drive magnet has a magnetic polarity boundary line extending within a lane perpendicular to the optical axis of the image stabilizing lens, and the magnetic force suppressing cutout portions are provided along the magnetic polarity boundary lines of each drive magnet;
• and
• wherein the magnetic force suppressing cutout portions are constituted of multiple holes disposed along the magnetic polarity boundary line of each drive magnet.

An anti-vibration actuator for moving an image stabilizing lens, comprising:

• a fixed portion;
• a movable portion to which the image stabilizing lens is attached;
• a movable portion supporting member that supports the movable portion so that it is movable relative to the fixed portion within a plane perpendicular to the optical axis of the image stabilizing lens;
• drive coils attached to one of either the fixed portion or the movable portion;
• drive magnets attached to the other of either the fixed portion or the movable portion so as to respectively face the drive coils;
• and
• at least one yoke attached to the side of the drive coil not facing the drive magnet;
• wherein the at least one yoke includes magnetic force suppressing cutout portions formed in a position overlapping the drive coils in order to suppress magnetic force received from the drive magnet;
• and
• wherein at least two of the drive magnets are disposed so that the magnetic polarity boundary lines thereof extend in a direction tangential to a circle centered on the optical axis, and the magnetic force suppressing cutout portions are constituted by multiple holes disposed along a direction tangential to the circle so as to follow the magnetic polarity boundary line.

An anti-vibration actuator for moving an image stabilizing lens, comprising:

• a fixed portion;
• a movable portion to which the image stabilizing lens is attached;
• a movable portion supporting member that supports the movable portion so that it is movable relative to the fixed portion within a plane perpendicular to the optical axis of the image stabilizing lens;
• drive coils attached to one of either the fixed portion or the movable portion;
• drive magnets attached to the other of either the fixed portion or the movable portion so as to respectively face the drive coils;
• and
• at least one yoke attached to the side of the drive coil not facing the drive magnet;
• wherein the at least one yoke includes magnetic force suppressing cutout portions formed in a position overlapping the drive coils in order to suppress magnetic force received from the drive magnet;
• and
• wherein at least three of the multiple drive magnets are disposed so that the magnetic polarity boundary lines thereof extend in a direction radial to a circle centered on the optical axis, and the magnetic force suppressing cutout portions are constituted by multiple holes disposed along a direction radial to the circle so as to follow the magnetic polarity boundary line.