Stage apparatus and image movement correction apparatus for camera using stage apparatus
View Patent ↗A stage apparatus includes a stationary support plate; a stage member provided on the stationary support plate so as to move on a reference plane parallel with the stationary support plate; Y-direction magnetic flux generating devices secured to one of the stationary support plate and the stage member; and Y-direction moving coils secured to the other of the stationary support plate and the stage member, the Y-direction moving coils receiving magnetic flux from the Y-direction magnetic flux generating devices so as to generate a driving force in a specific Y-direction between the Y-direction magnetic flux generating devices and the Y-direction moving coils. The Y-direction moving coils are secured to the stage member so that the Y-direction moving coils at least partly overlap each other in an X-direction, which is parallel with the reference plane and perpendicular to the Y-direction, and do not overlap in the Y-direction.
1. A stage apparatus comprising:
a stationary support plate;
a stage member provided on the stationary support plate so as to move on a reference plane parallel with the stationary support plate;
a plurality of Y-direction magnetic flux generators secured to one of said stationary support plate and said stage member; and
a plurality of Y-direction moving coils secured to the other of said stationary support plate and said stage member, said Y-direction moving coils receiving magnetic flux from said Y-direction magnetic flux generators so as to generate a driving force in a specific Y-direction parallel with said reference plane between said Y-direction magnetic flux generators and said Y-direction moving coils,
a plurality of X-direction magnetic flux generators secured to one of said stationary support plate and said stage member; and
a plurality of X-direction moving coils secured to the other of said stationary support plate and said stage member, said X-direction moving coils receiving magnetic flux from said X-direction magnetic flux generators so as to generate a driving force in said X-direction between said X-direction magnetic flux generators and said X-direction moving coils;
wherein at least one of said Y-direction moving coils and at least one of said Y-direction magnetic flux generators at least partly overlap each other in an X-direction, which is parallel with said reference plane and perpendicular to said Y-direction, and do not overlap in said Y-direction, and
wherein at least one of said X-direction moving coils and at least one of said X-direction magnetic flux generators at least partly overlap each other in said X-direction, and do not overlap in said Y-direction.
2. The stage apparatus according to claim 1 , wherein said at least one of said Y-direction moving coils and said at least one of said Y-direction magnetic flux generators, which are secured to said stage member, are aligned in said X-direction.
3. The stage apparatus according to claim 1 , further comprising a pair of Y-direction displacement detection sensors provided in the vicinity of opposite ends of said at least one of said Y-direction moving coils and said at least one of said Y-direction magnetic flux generators which are secured to said stage member, for detecting displacement thereof in said Y-direction.
4. The stage apparatus according to claim 3 , wherein all of said Y-direction moving coils that are secured to said stage member are arranged between said pair of Y-direction displacement detection sensors.
5. The stage apparatus according to claim 1 , wherein said stage apparatus comprises an image movement correction apparatus.
6. The stage apparatus according to claim 5 ,
wherein said image movement correction apparatus comprises an image pickup apparatus having a square shape defined by a pair of X-direction sides extending in the X-direction and a pair of Y-direction sides extending in the Y-direction,
wherein at least one of said Y-direction magnetic flux generators and at least one of said Y-direction moving coils, which are secured to said stage member, are secured thereto along said X-direction sides, and
wherein at least one of said X-direction magnetic flux generators and at least one of said X-direction moving coils, which are secured to the stage member, are secured thereto along said Y-direction sides.
7. The stage apparatus according to claim 5 , wherein said image movement correction apparatus comprises a correction lens.
8. The stage apparatus according to claim 1 , wherein said X-direction moving coils and said Y-direction moving coils each comprises a planar coil parallel with said reference plane.
9. The stage apparatus according to claim 1 , wherein said X-direction magnetic flux generators and said Y-direction magnetic flux generators each comprises:
a magnet; and
a yoke through which magnetic flux of said magnet is transmitted and which generates magnetic lines of flux together with said magnet.
10. An image movement correction apparatus for a camera using the stage apparatus according to claim 5 , wherein said camera comprises:
said stage apparatus;
a rotational shake detection sensor for detecting rotational shake of said camera in said reference plane; and
a controller for supplying electricity to said Y-direction moving coils to correct the camera shake in accordance with shake information detected by the rotation-shake detection sensor.
11. An image movement correction apparatus for a camera using the stage apparatus according to claim 6 , wherein said camera comprises:
said stage apparatus;
a rotational shake detection sensor for detecting rotational shake of said camera in said reference plane; and
a controller for supplying electricity to said Y-direction moving coils to correct the camera shake in accordance with shake information detected by the rotation-shake detection sensor.
12. The image movement correction apparatus for a camera using the stage apparatus, according to claim 10 , comprising:
X-direction and Y-direction shake detection sensors for detecting camera shake in said X-direction and said Y-direction, respectively, wherein said controller supplies electricity to said X-direction moving coils and said Y-direction moving coils to correct said camera shake in accordance with shake information detected by said X-direction shake detection sensor and said Y-direction shake detection sensor, respectively.
13. The image movement correction apparatus for a camera using the stage apparatus, according to claim 11 , comprising:
X-direction and Y-direction shake detection sensors for detecting camera shake in said X-direction and said Y-direction, respectively, wherein said controller supplies electricity to said X-direction moving coils and said Y-direction moving coils to correct said camera shake in accordance with shake information detected by said X-direction shake detection sensor and said Y-direction shake detection sensor, respectively.
14. The stage apparatus according to claim 1 , wherein a distance between one pair of Y-direction moving coils is shorter than a distance between one pair of X-direction moving coils.