US 9,810,918 B2
Resonance prevention method in optical unit with shake correction function and optical unit with shake correction function
Shinji Minamisawa, Nagano (JP)
Assigned to NIDEC SANKYO CORPORATION, Suwa-Gun, Nagano (JP)
Filed by NIDEC SANKYO CORPORATION, Suwa-gun, Nagano (JP)
Filed on Mar. 26, 2015, as Appl. No. 14/669,375.
Claims priority of application No. 2014-067070 (JP), filed on Mar. 27, 2014.
Prior Publication US 2015/0277140 A1, Oct. 1, 2015
Int. Cl. G02B 27/64 (2006.01); G02B 7/02 (2006.01); G03B 5/06 (2006.01)
CPC G02B 27/646 (2013.01) [G02B 7/023 (2013.01); G02B 7/026 (2013.01); G03B 5/06 (2013.01); G03B 2205/0023 (2013.01)] 21 Claims
OG exemplary drawing
 
2. An optical unit with a shake correction function comprising:
a movable module structured to hold an optical element;
a support body which comprises a body part surrounding the movable module;
a gimbal mechanism which comprises a movable frame having elasticity structured to swingably support the movable module between the movable module and the support body;
a spring member which is connected to the movable module and the support body for holding posture of the movable module; and
a shake correction drive mechanism structured to swing the movable module;
wherein the movable module is required to be swingably supported around a first axial line intersecting an optical axis direction, and the movable module is required to be swingably supported around a second axial line intersecting the optical axis direction and the first axial line,
wherein the movable frame is provided with a first corner part, a second corner part, a third corner part and a fourth corner part around the optical axis,
wherein the support body is provided with a first corner part, a second corner part, a third corner part and a fourth corner part around the optical axis,
wherein the second corner part and the fourth corner part of the movable frame located on the first axial line are swingably supported by the second corner part and the fourth corner part of the support body,
wherein the first corner part and the third corner part of the movable frame located on the second axial line swingably support the movable module, and
wherein when a natural vibration frequency of the movable frame is “fa”, a natural vibration frequency of the spring member is “fb”, and a vibration frequency band of a movable body on which the support body is mounted is “fw”, the natural vibration frequency “fa” of the movable frame and the natural vibration frequency “fb” of the spring member are shifted from the vibration frequency band “fw” of the movable body.