Optical apparatus including an image stabilizing apparatus
An image stabilizer includes: an optical system movable in a plane perpendicular to an optical axis (“orthogonal plane”) and correcting image blur; a movable member holding the optical system and movable relative to a fixed member in an orthogonal plane; a guide guiding the movable member while preventing from rotating in an orthogonal plane; three first balls rollably interposed between the fixed and guide members; two second balls rollably interposed between the guide and movable members; one third ball rollably interposed between the fixed and movable members; a biasing unit biasing the movable member toward the fixed member; and a drive unit driving the movable member relative to the fixed member in two directions perpendicular to the optical axis, wherein in an orthogonal plane, two of the first balls are rollable only in first direction; the second balls are rollable only in second direction different from the first direction.
1. An image stabilizing apparatus comprising:
an optical system that corrects an image blur;
a fixed member;
a movable member that holds the optical system and is movable with respect to the fixed member in the plane perpendicular to an optical axis;
a guide member that guides the movable member to prevent the movable member from rotating in the plane perpendicular to the optical axis;
three first rolling balls rollably interposed between the fixed member and the guide member;
two second rolling balls rollably interposed between the guide member and the movable member;
one third rolling ball rollably interposed between the fixed member and the movable member;
a biasing unit that biases the movable member in a direction toward the fixed member; and
a drive unit that drives the movable member with respect to the fixed member in two directions perpendicular to the optical axis, wherein:
two of the first rolling balls are rollable only in a first direction perpendicular to the optical axis; and
the second rolling balls are rollable only in a second direction that is perpendicular to the optical axis and is different from the first direction; and
the second rolling balls and the third rolling ball are arranged equiangularly in a rotating direction about the optical axis;
abutting portions in which the first rolling balls and the second rolling balls abut against the guide member are arranged at positions different from each other in the rotating direction about the optical axis;
abutting portions in which the two of the first rolling balls rollable only in the first direction abut against the guide member and the fixed member comprise guide grooves extended in the first direction; and
abutting portions in which the second rolling balls abut against the movable member and the fixed member comprise guide grooves extended in the second direction.
2. An optical apparatus, comprising the image stabilizing apparatus according to claim 1 .
3. An image stabilizing apparatus comprising:
an optical system that corrects an image blur;
a fixed member;
a movable member that holds the optical system and is movable with respect to the fixed member in a plane perpendicular to the optical axis;
a guide member that guides the movable member to prevent the movable member from rotating in the plane perpendicular to the optical axis;
three first rolling balls rollably interposed between the fixed member and the guide member;
two second rolling balls rollably interposed between the guide member and the movable member;
one third rolling ball rollably interposed between the fixed member and the movable member;
a biasing unit that biases the movable member in a direction toward the fixed member; and
a drive unit that drives the movable member with respect to the fixed member in two directions perpendicular to the optical axis, wherein:
two of the first rolling balls are rollable only in a first direction perpendicular to the optical axis;
the second rolling balls are rollable only in a second direction that is perpendicular to the optical axis and is different from the first direction;
the drive unit comprises a yoke formed of a magnetic material magnetically coupled to a magnet, and is fixed integrally with the fixed member; and
the yoke comprises abutting portions in which the third rolling ball and at least two of the first rolling balls abut against the fixed member.
4. An optical apparatus, comprising the image stabilizing apparatus according to claim 3 .